ICOM IC-7400 Instruction manual

INSTRUCTION MANUAL

HF/VHF

ALL MODE TRANSCEIVER

i7400

i

FOREWORD

We understand that you have a choice of many different radios in the market place. We want to take a couple of moments of your time to thank you for making the IC-7400 your radio of choice, and hope you agree with Icom’s philosophy of “technology first". Many hours of research and development went into the design of your IC-7400.

FEATURES

• 32-bit Floating point DSP and 24-bit AD/DA converter

• DSP IF Filter creates 102 types of fi lter

• All mode capability covering 160–2 m

• 100 Watt continuous duty cycle

• All mode digital modulation and demodulation

• RTTY demodulator and decoder

• Twin Pass Band Tuning

• RF speech compression with selectable pass band

• Microphone Equalizer

• SSB/CW synchronous tuning

IMPORTANT

READ THIS INSTRUCTION MANUAL

CAREFULLY

before attempting to operate the transceiver.

SAVE THIS INSTRUCTION MANUAL.

This manual contains important safety and operating instructions for the IC-7400.

EXPLICIT DEFINITIONS

WORD DEFINITION

CAUTION Equipment damage may occur.

NOTE

If disregarded, inconvenience only. No risk or personal injury, fi re or electric shock.

PRECAUTIONS

R WARNING HIGH VOLTAGE! NEVER

attach an antenna or internal antenna connector during transmission. This may result in an electrical shock or burn.

R NEVER

apply AC to the [DC13.8V] jack on the transceiver rear panel. This could cause a fi re or ruin the transceiver.

R NEVER

apply more than 16 V DC, such as a 24 V battery, to the [DC13.8V] jack on the transceiver rear panel. This could cause a fi re or ruin the transceiver.

R NEVER

let metal, wire or other objects touch any internal part or connectors on the rear panel of the transceiver. This may result in an electric shock.

NEVER expose the transceiver to rain, snow or any liquids.

AVOID using or placing the transceiver in areas with temperatures below –10°C (+14°F) or above +60°C (+140°F).

Be aware that temperatures on a vehicle’s dashboard can exceed +80°C (+176°F), resulting in permanent damage to the transceiver if left there for extended periods.

AVOID placing the transceiver in excessively dusty environments or in direct sunlight.

AVOID placing the transceiver against walls or putting anything on top of the transceiver. This will obstruct heat dissipation.

Place unit in a secure place to avoid inadvertent use by children.

During mobile operation, DO NOT operate the transceiver without running the vehicle’s engine. When the transceiver’s power is ON and your vehicle’s engine is OFF, the vehicle’s battery will soon become exhausted.

Make sure the transceiver power is OFF before starting the vehicle. This will avoid possible damage to the transceiver by ignition voltage spikes.

During maritime mobile operation, keep the transceiver and microphone as far away as possible from the magnetic navigation compass to prevent erroneous indications.

BE CAREFUL! The heatsink will become hot when operating the transceiver continuously for long periods.

BE CAREFUL! If a linear amplifi er is connected, set the transceiver’s RF output power to less than the linear amplifi er’s maximum input level, otherwise, the linear amplifi er will be damaged.

Use Icom microphones only (supplied or optional). Other manufacturer’s microphones have different pin assignments, and connection to the IC-7400 may damage the transceiver.

TABLE OF CONTENTS

FOREWORD ...................................... i

IMPORTANT ...................................... i

EXPLICIT DEFINITIONS .................... i

PRECAUTIONS ................................. i

TABLE OF CONTENTS .................... ii

QUICK REFERENCE GUIDE .......I–X

■ Installation .........................................I

■ Operation ........................................III

■ Your fi rst contact ............................ IV

■ Ready to call CQ? .......................... IX

■ Front panel .......................................1

■ Rear panel .......................................7

■ LCD display ......................................9

■ Multi function switches ...................11

■ Microphone (HM-36) ......................12

■ Electronic keyer functions ..............29

■ Operating RTTY (FSK) ..................35

■ RTTY functions ..............................36

■ Operating AM .................................40

■ Operating FM .................................41

■ Repeater operation ........................44

5 FUNCTIONS FOR RECEIVE

.......................................... 46–53

■ Simple band scope ........................46

■ Preamp/Attenuator .........................47

■ RIT function ....................................47

■ AGC function ..................................48

■ IF fi lter selection .............................49

■ IF (DSP) fi lter shape ......................50

■ Noise blanker .................................50

■ Meter peak hold function ................50

■ Twin PBT operation .......................51

■ Noise reduction ..............................52

■ Notch function ................................52

■ Dial lock function ............................52

■ Voice squelch control function .......53

CONNECTIONS ................... 13–17

■ Unpacking ......................................13

■ Selecting a location ........................13

■ Grounding ......................................13

■ Antenna connection .......................13

■ Required connections ....................14

■ Advanced connections ...................15

■ Power supply connections .............16

■ Linear amplifi er connections ..........17

■ External antenna tuner connections ....................................17

.......................................... 54–60

■ VOX function ..................................54

■ Break-in function ............................55

■ ∂TX function ..................................56

■ Monitor function .............................56

■ Speech compressor .......................57

■ Transmit fi lter width selection .........57

■ Split frequency operation ...............58

■ Quick split function .........................59

■ Measuring SWR .............................60

■ When fi rst applying power

(CPU resetting) ..............................18

■ Initial settings .................................18

■ Selecting an operating band ..........19

■ Selecting VFO/memory mode ........20

■ VFO operation ................................20

■ Frequency setting ..........................21

■ Operating mode selection ..............23

■ Volume setting ...............................23

■ Squelch and receive (RF) sensitivity .......................................24

■ Basic transmit operation ................25

4 RECEIVE AND TRANSMIT . 26–45

■ Operating SSB ...............................26

■ Operating CW ................................27

■ Memory channels ...........................61

■ Memory channel selection .............61

■ Programming a memory ................62

■ Memory clearing ............................62

■ Selecting the call channel ..............63

■ Programming the call channel .......63

■ Frequency transferring ...................64

■ Programming scan edges ..............65

■ Assigning memory names ..............66

■ Memo pads ....................................67

■ Scan types .....................................68

■ Preparation ....................................68

■ Voice squelch control function .......69

■ Scan set mode ...............................69

■ Programmed scan/Fine programmed scan ...............................................70

■ Memory scan operation .................71

■ Select memory scan ......................71

■ ∂F scan operation and Fine ∂F scan

...................................................... 72

■ Tone scan/DTCS code scan operation ........................................73

.......................................... 74–76

■ Antenna connection and selection .74

■ Antenna tuner operation ................75

■ Optional external tuner operation ...76

10 DATA COMMUNICATION ... 77–79

■ Connections ...................................77

■ Packet (AFSK) operation ...............78

■ Adjusting the TNC output level ......79

■ Data transmission speed ...............79

11 SET MODE ........................... 80–88

■ General set mode ..........................80

■ Tone control set mode ...................88

12 OPTION INSTALLATION .... 89–90

■ Opening the transceiver’s case ......89

■ UT-102

VOICE SYNTHESIZER UNIT

....89

■ CR-338

HIGH STABILITY CRYSTAL UNIT

......................................................90

13 MAINTENANCE ................... 91–93

■ Trouble shooting ............................91

■ Fuse replacement ..........................92

■ Tuning dial brake adjustment .........92

■ Resetting the CPU .........................93

■ Frequency calibration (approximate)

.......................................................93

14 CONTROL COMMAND ....... 94–98

■ Remote jack (CI-V) information ......94

15 SPECIFICATIONS ..................... 99

16 OPTIONS ................................. 100

17 ABOUT CE ....................... 101–102

SUPPLIED ACCESSORIES

The transceiver comes with the following accessories.

Qty.

q DC power cable* ................................................. 1 w Hand microphone (HM-36) ................................. 1 e Spare fuses (FGB 30 A) ...................................... 2 r Spare fuse (FGB 5 A) ......................................... 1 t CW keyer plug (AP-330) ..................................... 1

* The illustration shows OPC-025D. However, OPC-639 is supplied with versions, which “CE” symbol on the serial q e number.

r t w

Icom, Icom Inc. and the logo are registered trademarks of Icom Incorporated (Japan) in the United States, the United Kingdom, Germany, France, Spain, Russia and/or other countries.

ii

QUICK REFERENCE GUIDE

■ Installation

1. Install a ground system for DC noise suppression and RFI suppression

2. Install your DC power supply

3. Install lightning protection. This will help protect more than your gear.

4. Install and connect an antenna system for the appropriate bands of operation

5. Connect other peripheral equipment. This includes microphones, headsets, TNC, amplifi ers and any other equipment necessary to make your shack complete.

I

1. Grounding your Shack

Although your radio will operate by connecting the DC power supply and antenna, it is necessary to have a good ground system in your shack. A ground connection is the electrical contact between the common point of an electrical or electronic system and the earth.

A good earth ground is necessary to prevent electrical shock, eliminate problems from RFI and DC noise.

With more electronic devices being used today, it is also important to reduce RFI and EMI. Although you may not see interference in your shack, without a grounding system, your neighbors may experience interference. Even though many of these devices, where they must accept interference from their surrounding environment, it is best to eliminate as much of the possible interference from your shack.

If you do not have a grounding system for your shack, depending on the location of your shack, basement or ground fl oor, a good ground system can be as simple as a couple of ground rods driven 2 to 2.5 meter into the soil. When installing your IC-7400 to your grounding system, the shortest most direct connection is recommended.

NOTE: There are many publications covering proper grounding techniques. Check with your local dealer for more information and recommendations.

2. Installing your DC Power Supply

The DC power supply is a device used to convert

110/220 V AC, also know as Household current, to a steady source of 13.8 V DC.

The perfect match to your IC-7400 is the PS-125.

This compact switching power supply is the matching power supply for your IC-7400 with a current rating of

25 A continuous duty. This plug and play unit plugs into the DC jack located on the rear of the radio.

PS-125

DC power socket

Transceiver

DC power cable

Connect to an AC outlet using the supplied AC cable.

R WARNING!: NEVER

ground station equipment or antennas to house gas lines. NEVER attach ground lines to plastic (pvc) pipe.

D Some Symptoms if inadequate grounding

a. Poor DC Ground

50/60 Hz hum on the audio either Rx or Tx without the antenna connected.

If you feel a tingling sensation when you touch a metal surface. Surfaces such as the cover of your radio or power supply.

b. Poor RF Ground

While transmitting and you feel a tingling sensation when you touch a metal surface. Surfaces such as the cover of your radio or power supply.

While transmitting, you experience interference to other electronic devices, such as the telephone, television or stereo audio systems.

• If you are not using the PS-125:

Connect the supplied DC power cable to the appropriate color coded terminals, then insert the DC connector into the DC jack located on the rear of the radio.

(The diagram below describes the connection with OPC-

639. OPC-025D has no fi lter box and GND cable.)

AC outlet

A DC power supply* to DC power socket

Transceiver

Red

+

Black

_

AC cable

30 A fuses

Supplied

DC power cable

*13.8 V; at least 23 A continuous

NOTE: Although the power supply current requirement is quite low during receiving, this not the case when you transmit. With many electrical devices in the shack, it is very important to verify the electrical circuit is not overloaded.

QUICK REFERENCE GUIDE

3. Installing lightning protection

Although you may not live in an area with high occurrence for lightning storms, it is always wise to take precautions for lightning or static discharges. Proper lightning protection not only offers protection to the ham gear, but the shack and most importantly the operator.

4. Installing your antenna system

Whether your IC-7400 is your fi rst radio or one of many, one of your key elements in a great shack is the antenna system. There are three connections on the back of your IC-7400, two for HF and 6 m and one for 2 m. If you are using one antenna for HF and

6 m, for simplicity, connect the antenna coax to ANT

1.

ANTENNA 1, 2

[Example]: ANT1 for 1.8–18 MHz bands

ANT2 for 21–50 MHz bands

144 MHz ANTENNA

Connect a VHF (60–144 MHz) antenna; impedance: 50

Ω.

Your IC-7400 is equipped with an internal antenna tuner (ATU) for operation on 160–6 m. This ATU is designed to work with an unbalanced 50

Ω feedline.

The purpose of the internal antenna tuner is to match the impedance of your antenna system to as close to a 50

Ω load as possible. This ATU will not operate with a long wire or ladder line (450

Ω or other balanced feedlines). An external ATU such as the AH-4 would be necessary for this kind of operation.

NOTE: There are many publications covering proper lightning protection, check with your local dealer for more information and recommendations.

Antenna SWR

Each antenna is tuned for a specifi ed frequency range and SWR may be increased out-of-range.

When the SWR is higher than approx. 2.0:1, the transceiver’s power drops to protect the fi nal transistors. In this case, an antenna tuner is useful to match the transceiver and antenna. Low SWR allows full power for transmitting even when using the antenna tuner. The IC-7400 has an SWR meter to monitor the antenna SWR continuously.

PL-259 CONNECTOR INSTALLATION EXAMPLE

q

30 mm Slide the coupling ring down. Strip the cable jacket and soft solder.

Coupling ring 10 mm (soft solder) w e

10 mm

Soft solder

1–2 mm solder solder

Strip the cable as shown at left. Soft solder the center conductor.

Slide the connector body on and solder it.

r

Screw the coupling ring onto the connector body.

30 mm

≈

9

⁄

8

in 10 mm

≈

3

⁄

8

in 1–2 mm

≈

1

⁄

16

in

R WARNING: Although a mag mount antenna works great on a vehicle, DO NOT use the IC-7400 with this type of antenna.

CAUTION: Although your IC-7400 has protection to drop down power with a high SWR, this does not completely protect the transceiver from transmission without an antenna. Make sure you have an antenna connected whenever you transmit with your radio.

NOTE: There are many publications covering proper antennas and their installation, check with your local dealer for more information and recommendations.

II


5. Connect other peripheral equipment

Everyone has his or her favorite ad-on gear; now is the time to connect this gear! We will cover the basic devices that can be connected to your IC-7400.

If you do not see the particular item you are wanting to connect, refer to the Advance Connections section starting on page 15.

■ Operation

1. Voice

Microphones: Connect the microphone to the eightpin connector on the front of the radio.

MICROPHONES

HM-36 SM-20

2. CW

CW Key: There are several types of keys or keyers that can be used with your IC-7400.

a. Iambic Key paddle: Use a 6.35(d) mm ( 1 ⁄

4

) stereo plug and connect to the [ELEC-KEY] jack located on the front of the radio.

b. Straight Key: Use a 6.35(d) mm ( 1 ⁄

4

) mono plug and connect key to the back of the radio.

c. External Keyer: Use a 6.35(d) mm ( 1 ⁄

4

) mono plug and connect to the back of the radio.

d. Computer Keying: Use a 6.35(d) mm ( 1 ⁄

4

) mono plug and connect to the back of the radio.

III

CW KEY

(dot)

(com)

(dash)

A straight key can be used when the internal electronic keyer is turned OFF in keyer set mode. (p. 34)

STRAIGHT KEY

(

+)

(

_)

NOTE: You will need to select the type of keyer you are using in the Keyer Set mode. There are many advanced CW functions in this set mode, until you have a full understanding of these functions change only the items necessary.


3. Other convenient items

Headphones:

A 6.35(d) mm (

1

⁄

4

) mono jack for operation without using the internal or external speakers. Perfect for operation without disturbing others in the room.

External Speaker:

A 3.5(d) mm (

1

⁄

8

) mono jack for operation with an external speaker. (Input impedance: 8

Ω/Max. input power: 5 W)

HEADPHONES

EXTERNAL SPEAKER

SP-21 (optional)

■ Your fi rst contact

Now you should have your IC-7400 installed in your shack, and like a kid on his birthday, you are probably excited to get on the air. We would like to take you through a few basic operation steps to make your fi rst

“On The Air” an enjoyable experience.

D Getting started

1. Before powering up your radio, you may want to make sure the following controls are set in the following positions:

2. Resetting the CPU: Although you have purchased a brand new radio, some settings may be changed from the factory defaults during the QC process.

So your radio can start from Factory Defaults resetting the CPU is necessary.

[POWER] [F-INP] [M-CL] ume: fully counter clockwise.

counter clockwise.

• [MIC GAIN] : The mic gain: fully counter clockwise.

• [RF/SQL] : The control for the RF Gain and

Squelch circuits: 12 o’clock.

• [CW PITCH] : The control for the CW pitch:

12 o’clock.

• [KEY SPEED] : Internal CW Keyer Speed: fully counter clockwise.

• [NOTCH] : Control for the manual notch:

12 o’clock

IV


D Just listening

1. Select the desired band

On your IC-7400, an easy way of changing bands is by using the keypad located just above the tuning knob on the right hand side of the display. You will notice each switch has two sets of numbers; one set of numbers represents the band selection.

• Say you want to go to 20 meters or 14 MHz; you would push the [14 5]. This will immediately change the displayed operating frequency to the 20-meter band. By pushing [14 5] again, frequency pre-sets in the triple band stacking registers frequency can be displayed. For more details on this system refer to p. 19.

1.8

1 3.5

2 7 3

10

4

14

5

18

6

21 7 24 8 28 9

GENE 50

0

144

ENT

2. Tune to the desired frequency

Directly below the keypad is the tuning knob. This will allow you to dial in the frequency you want to operate. You will notice the tuning speed [TS] is 10 Hz resolution. Page 22 will instruct you on how to set the tuning speed [TS] for 1 Hz resolution.

NOTE: Although you can directly enter the frequency with the keypad, using the Band Stacking

Register and the tuning knob is the most popular method of hoping around the bands. For more information regarding the direct frequency entry method, refer to p. 22.

V

3. Verify proper antenna has been selected.

Your IC-7400 has three antenna connectors. Two for

HF and 6 m and a one for 2 m. The selection for 2 m is automatic, where the HF and 6 m is user selectable for either one of the antenna jacks. For fi rst time use, the antenna selector should show “ ” on the display of your radio. Verify the antenna selected on the display is the antenna port your antenna is connected to.

4. Adjust audio output

Adjust this control to a comfortable audio level.

Either “

1” or “2” appears.

*No indicator appears during

144 MHz operation.

Decreases

AF RF/SQL

Increases

No audio output Max. audio output


D What are you hearing?

Stop and focus on what you are hearing. Do you hear a lot of noise? Is the signal intelligible? Are you set up for the right mode? How about the fi lters?

1. Verify mode

Although your IC-7400 will automatically select USB or LSB in the HF bands, it will not select any of the other modes. You will need to select the proper mode whether CW, RTTY, AM or FM.

SSB CW/RTTY AM/FM

Hint!

The Triple Band Stacking Register will memorize the last three frequencies used in the band, as well as the Mode, Filter, Tuner and AGC settings. This makes band hoping much easier.

2. Reducing interference

Your IC-7400 has many features to reduce QRM and

QRN from the desired signal.

a. Noise Reduction: The noise reduction system on your IC-7400 is part of the 32-bit DSP. This is used to reduce the hiss and QRM levels. To activate, push the [NR] switch located just to the right of the

[PHONES] jack.

Decreases

NR NOTCH

Increases

OFF

Noise reduction ON

Noise reduction OFF

[NR] [NR]

A G C D U P C M P T B W S C P

Appears

b. Adjusting the Noise Reduction: The noise reduction is completely variable on how much of the

DSP Noise Reduction is used [NR] level control located just above the [NR] switch.

Hint!

How far you advance the NR control will determine how much the noise can be effectively reduced.

Turning the control too far clockwise may cause some distortion to occur on the received signal.

The NR control should only be turned as far clockwise as is necessary. Use this control, along with

RF gain, NB (noise blanker, if needed), and IF fi lters as well, to minimize the effects of noise on the target signal.

VI

VII


c. Notch: There are two notch systems on your IC-

7400.

• Automatic: The automatic notch will track up to three heterodynes. This is helpful for eliminating annoying transmitter “tune up” tones on any band, and to minimize continuous tone “heterodynes” encountered on the 40 meter phone bands at night, for example.

Once selected an icon will appear “

N NOTCH” on the display.

Hint!

The Automatic Notch will not operate in the SSB data, CW or RTTY modes.

• Manual: The Manual notch provides 70 dB of attenuation to pin point an interfering signal. The 12 o’clock position is on the operating frequency, turning the Notch knob clockwise moves the notch up the band and counter clockwise will move the notch down the band. Once selected an icon “NOTCH” will appear on the display.

NR NOTCH

Low frequency High frequency

[

A/NOTCH] [NOTCH]


Notch function indicators

NOTE: Your IC-7400 is equipped with multiple

AGC circuits. This allows the DSP to fi lter out interfering signals and QRM, while also taking this interference out of the AGC. Bottom line, this will either eliminate or greatly reduce the pumping of the

AGC from the interfering signal.

d. Filters: Your IC-7400 has an incredible IF DSP based fi lter network with over 100 settings.

• Dial in your fi lters: By pushing [FILTER] for 1 sec., you enter the fi lter set mode. This is where you are able set the three fi lter presets. Across the bottom of the display you will see the “BW” icon. The switch directly below, along with the tuning dial, will be used to select the changes you will make.

• Filter set mode indication

B W

Shows the selected filter and passband width.

• Indication while setting

B W

Reverses Appears

While pushing [F1 BW], rotate the tuning dial to set passband width.

[FILTER]


The selected filter width is indicated for approx. 1 sec. when [FILTER] is pushed.

Filter selection


d. Filters:— continued

• On the fl y adjustment: Once the adjustments have been made in the fi lter set mode, you can make on the fl y changes by using the Twin Pass Band Tuning, Twin PBT. You will be able to see the effects of the Twin PBT on the upper left hand side of the screen.

PBT operation example

[TWIN PBT] control

[PBTC]

One of “

1,” “2” or “3” is displayed for selected filter number indications.

NOTE: The Twin PBT fi lters shift the two IF DSP fi lters (See Diagrams below and right). This feature allows both an IF shift as well as a narrowing of the

Pass Band. Although you can narrow the pass band by shifting the two fi lters, this does not narrow both fi lters, thus the fi lter shape is not narrowed. You may hear some signal artifacts pass through this fi lter adjustment.


Passband width and shifting value are indicated while [TWIN PBT] is operated.

Appears when PBT is used.


B W


• Indication while PBT setting

B W

Center

Passband

Appears when passband is shifted.

*By pushing [PBTC] for 1 sec., the shifted value returns

to the default setting, and the “dot” disappears.

Passband IF shift pass band

IF center frequency interference desired signal inteference desired signal IF center freq.

interference

VIII


IX

3. RX Tone Control:

Once you have mastered your fi lter settings, one last feature to enable the most intelligible audio is the actual audio tone you hear. You can adjust the equalization of your received audio ±5 dB.

q Push [MENU] several times, or until M2 is shown on the display.

w Push [F4 TCN] for the Tone Control set mode.

e Push the appropriate mode switch to adjust SSB,

AM or FM.

r Push [F1 ≤] or [F2 ≥] to change to the desired component.

1. RX Bass

This item adjusts the bass level of the receive audio tone from –5 dB to +5 dB in 1 dB steps.

[F1 ≤] [F2 ≥] [F4 TCN]

[MENU] Tuning dial

R X B a s s S S B

3 O

2. RX Treble

This item adjusts the treble level of the receive audio tone from –5 dB to +5 dB in 1 dB steps.

We hope these pointers have been helpful. Now you are ready for the “Ready to call CQ?”.

R X T r e b l e S S B

4 O

■ Ready to call CQ?

[NR]: Max. CCW [NOTCH]: Max. CCW

POWER

i7400

TUNER ANT

NR NOTCH

TRANSMIT

HF/VHF TRANSCEIVER

[TRANSMIT]: OFF

[AF]: Max. CCW

[RF/SQL]: 12 o’clock

[MIC GAIN]: Max. CCW

PHONES

ELEC-KEY

NR

A/NOTCH

AF RF/SQL

MIC

F 1

MENU

F 2

SSB

F 3

CW/RTTY

F 4

AM/FM

F 5

FILTER

MIC GAIN RF PWR CW PITCH KEY SPEED P.AMP/ATT NB VOX/BK-IN MONITOR

CALL

TWIN PBT

1.8

1 3.5

2 7 3

10 4 14 5 18 6

21 7 24 8 28 9

GENE 50 0 144 ENT

F-INP

SPLIT

A/B

XFC

MP-W

TX

MP-R TS

RX

LOCK

PBTC MW

V/M

M-CH

M-CL

RIT

∂TX

CLEAR

RIT/

∂TX

LOCK/

SPCH

[RF PWR]: Max. CCW [CW PITCH]: 12 o’clock

1. Setting up your transmit audio

The 32-bit DSP in your IC-7400 is capable of allowing you to selects transmit audio for phone modes.

2. Mic Gain

The microphone gain is used for proper transmit audio level for full output power.

[KEY SPEED]: Max. CCW


3. DSP TX Audio Pass Band

The capability of changing the pass band of your transmit audio, is at your fi nger tips. Regardless of the condition of the speech compressor, you can adjust it by selecting the [F4 TBW].

You will fi nd this located in the M1 menu. By pushing [F4 TBW] for 1 sec. you can select the TX audio band pass.

There are three levels of audio passband width available (Wide, Mid, and Nar).

TX Audio Passband widths

Wide : 2.8 kHz ; Great Full Audio

Mid : 2.4 kHz ; Great for operators with deep full voices

Nar : 2.2 kHz ; Great for breaking through pile ups

4. Microphone Equalizer

Although these bandwidths are fi xed, the Microphone

Tone Control will give you more audio control for your voice operation on SSB, AM, and FM modes.

Your IC-7400 is equipped with a very powerful equalizer system with 121 possible combinations. This is achieved by using the separate bass and treble adjustments. The default for both the Base and Treble is at 0 dB.

Entering Microphone Tone Control set mode:

q Push [MENU] several times, or until M2 is shown on the display.

w Push [F4 TCN] for the Tone Control set mode.

e Push the appropriate mode switch to adjust SSB,

AM, or FM.

r Push [F1 ≤] or [F2 ≥] to change to the desired component.


F 1 F 2 F 3

Push [F4]

F 4 F 5

T X B W = W I D E


F 1 F 2 F 3 F 4 F 5

The selected transmit filter width is displayed for approx. 1 sec.

Push [F4] for 1 sec. to select the transmit filter width.

[F1 ≤] [F2 ≥] [F4 TCN]

[MENU] Tuning dial

Hint!

Voice patterns and audio characteristics vary with each operator, therefore the [MIC GAIN], DSP

TX Audio Pass Band and Microphone Tone Control settings will be different for each operator. Actual on air experimenting is necessary to get just the right sound. Listen to your transmit audio with headphones and the monitor function turned ON.

It’s also best to test and adjust your audio on the air, while someone who knows what your real voice sounds like listens, and provides and opinion on your audio quality.

1. TX Bass

This item adjusts the bass level of the transmit audio tone from –5 dB to +5 dB in 1 dB steps.

1

T X B a s s S S B

O

2. TX Treble

This item adjusts the treble level of the transmit audio tone from –5 dB to +5 dB in 1 dB steps.

Verify you have selected a clear frequency and call out your CQ!

2

T X T r e b l e S S B

O

X

1

1

PANEL DESCRIPTION

■ Front panel

!7

!6

!5

!4

!3 !2

e r t q w

POWER

i7400

TUNER ANT

NR NOTCH

TRANSMIT

PHONES

ELEC-KEY

NR

A

/NOTCH

AF RF/SQL

MIC

HF/VHF TRANSCEIVER

F 1

MENU

F 2

SSB

F 3

CW/RTTY

F 4

AM/FM

F 5

FILTER

1.8

1 3.5

2

7

3

10 4 14 5 18 6

21 7 24 8 28 9

GENE 50

0

144 ENT

MP-W

XFC

TX

MP-R

F-INP

SPLIT

A/B

TS

RX

LOCK

CALL

LOCK/

SPCH MIC GAIN RF PWR CW PITCH KEY SPEED P.AMP/ATT NB VOX/BK-IN MONITOR y u i o !0

!1

q POWER SWITCH [POWER]

➥ Push momentarily to turn power ON.

• Turn the optional DC power supply ON in advance.

➥ Push for 1 sec. to turn power OFF.

w TRANSMIT SWITCH [TRANSMIT]

Selects transmitting or receiving.

[RX] indicator lights green when the squelch is open.

e HEADPHONE JACK [PHONES]

• Output power: 5 mW with an 8

Ω load.

or connected external speaker does not function.

r ELECTRONIC KEYER JACK [ELEC-KEY] (p. 14)

Accepts a paddle to activate the internal electronic keyer for CW operation.

key and straight key operation can be made in keyer set mode. (p. 34) panel. See [KEY] on p. 7.

set mode. (p. 34) nience. (p. 30)

(dot)

(com)

(dash) t MICROPHONE CONNECTOR [MIC]

Accepts the supplied or an optional microphone.

• See p. 101 for appropriate microphones.

• See p. 12 for microphone connector information.

y RF GAIN CONTROL/SQUELCH CONTROL [RF/

SQL] (outer control)

Adjusts the RF gain and squelch threshold level.

The squelch removes noise output from the speaker

(closed condition) when no signal is received.

available for other modes.

of the [RF/SQL] control.

SSB, CW and RTTY; squelch control in AM and FM) or squelch control (RF gain is fi xed at maximum) in set mode as follows. (p. 81)

MODE

AUTO

SET MODE SETTING

SQL RF GAIN + SQL

SSB, CW

RTTY

AM, FM

RF GAIN

SQL

SQL

SQL

RF GAIN + SQL

RF GAIN + SQL

• When setting as RF gain/squelch control

Noise squelch (FM mode)

Recommended level

Squelch is open.

Maximum

RF gain

RF gain adjustable range

S-meter squelch

PANEL DESCRIPTION

1

• When functioning as RF gain control

(Squelch is fi xed open; SSB, CW, RTTY only)

Adjustable range

Minimum RF gain

Maximum

RF gain

• When functioning as squelch control

(RF gain is fi xed at maximum.)

Noise squelch threshold

(FM mode)


S-meter squelch threshold

Squelch is open.

S-meter squelch

Shallow Deep

While rotating the RF gain control, noise may be heard. This comes from the DSP unit and does not indicate an equipment malfunction.

u MIC GAIN CONTROL [MIC GAIN]

Adjusts microphone input gain.

be adjusted in tone control set mode. (p. 88)

✔ How to set the microphone gain.

Set the [MIC] control so that the ALC meter sometimes swings during normal voice transmission in SSB mode.

Make sure that voice peak readings do not exceed the ALC range brackets on the meter.

Recommended level for an Icom microphone

Decreases Increases

MIC GAIN

i AF CONTROL [AF] (inner control)

Varies the audio output level from the speaker.

AF RF/SQL

Decreases Increases

No audio output Max. audio output o RF POWER CONTROL [RF PWR]

Continuously varies the RF output power from minimum

(less than 5 W*)

to maximum

(100 W*)

.

* AM mode: less than 5 W to 40 W

Decreases Increases

RF PWR

!0 CW PITCH CONTROL [CW PITCH] (p. 28)

Shifts the received CW audio pitch and monitored

CW audio pitch without changing the operating frequency.

prox. 25 Hz steps.

Decreases Increases

CW PITCH

!1 ELECTRONIC CW KEYER SPEED CONTROL

[KEY SPEED] (p. 28)

Adjusts the internal electronic CW keyer’s speed.

• 6 wpm (min.) to 60 wpm (max.) can be set.

Slow Fast

KEY SPEED

!2 AUTO NOTCH/MANUAL NOTCH SWITCH

[

A/NOTCH] (p. 52)

Toggles the notch function between manual and automatic when pushed.

• “NOTCH” appears when manual; “

A NOTCH” appears when automatic notch is selected.

!3 NOTCH CONTROL [NOTCH] (outer control; p. 52)

Adjusts the notch fi lter frequency to remove an interfering signal.

NR NOTCH

Low frequency High frequency

!4 ANTENNA SELECTOR SWITCH [ANT] (p. 74)

Switches the antenna connector selection between

ANT1 and ANT2 when pushed.

!5 NOISE REDUCTION LEVEL CONTROL [NR]

(inner control; p. 52)

Adjusts the noise reduction level when the noise reduction is in use. Set for maximum readability.

NR NOTCH

Decreases Increases

OFF

!6 ANTENNA TUNER SWITCH [TUNER] (pgs. 75, 76)

➥ Turns the antenna tuner ON and OFF

(bypass) when pushed momentarily.

➥ Starts to tune the antenna manually when pushed for 1 sec.

circuit is bypassed automatically after 20 sec.

!7 NOISE REDUCTION SWITCH [NR] (p. 52)

Switches the noise reduction ON and OFF.

• “NR” appears while the noise reduction is activated.

2

3

1

PANEL DESCRIPTION

■ Front panel

(continued)

T i746PRO

TUNER ANT

NR NOTCH

Y

NR

A

/NOTCH

AF RF/SQL

HF/VHF TRANSCEIVER

F 1

MENU

F 2

SSB

F 3

CW/RTTY

F 4

AM/FM

F 5

FILTER

CALL


!8

!9 @0 @1 @2 @3 @4 @5 @6

TWIN PBT

1.8

1 3.5

2 7 3

10

4

14

5

18

6

21 7 24 8 28 9

GENE

50 0 144 ENT

XFC

MP-W

TX

MP-R

F-INP

SPLIT

A/B

TS

RX

LOCK

PBTC MW

V/M

M-CH

M-CL

RIT

∂TX

CLEAR

RIT/

∂TX

@7

LOCK/

SPCH

@8 @9

#3

#2

#1

#0

#7

#6

#5

#4

!8 MULTI-FUNCTION SWITCHES [F1]–[F5]

➥ Push to select the function indicated in the LCD display above these switches. (p. 11)

Functions vary depending on the operating mode.

➥ Push to input a character for memory keyer programming or memory name. (pgs. 31, 66)

!9 MENU SWITCH [MENU]

Push to change the set of functions assigned to the multi-function switches.

• Toggles between menu 1 (M1) and menu 2 (M2).

@0 MODE SWITCHES

Selects the desired mode. (p. 23)

102 is installed. (p. 89)

SSB

CW/RTTY

AM/FM

➥ Selects USB and LSB mode alternately.

➥ Selects SSB data mode

(USB-D, LSB-D) when pushed for 1 sec. in SSB mode.

➥ Selects CW and RTTY mode alternately.

➥ Switches CW and CW-R

(CW reverse) mode when pushed for 1 sec. in CW mode.

➥ Switches RTTY and RTTY-R

(RTTY reverse)

mode when pushed for 1 sec. in

RTTY mode.

➥ Selects AM and FM mode alternately.

➥ Selects AM/FM data mode

(AM-D, FM-D) when pushed for 1 sec. in AM/FM mode.

@1 PREAMP/ATTENUATOR SWITCH [P.AMP/ATT]

(p. 47)

➥ Push momentarily to toggle between preamp-1 and preamp-2.

“P.AMP

1” activates for HF all bands.

“P.AMP

2” activates high-gain preamp for 24 MHz band and above.

➥ Push for 1 sec. to toggle the attenuator function

ON and OFF.

✔ What is the preamp?

The preamp amplifi es received signals in the front end circuit to improve the S/N ratio and sensitivity. Select “P.AMP

1” or

“P.AMP

2” when receiving weak signals.

✔ What is the attenuator?

The attenuator prevents a desired signal from distorting when very strong signals are near the desired frequency, or when very strong electric fi elds, such as from a broadcasting station, are near your location.

@2 NOISE BLANKER SWITCH [NB] (p. 50)

➥ Switches the noise blanker ON and OFF when pushed. The noise blanker reduces pulse-type noise such as that generated by automobile ignition systems. This function cannot be used for

FM, or non-pulse-type noise.

• “NB” appears while the noise blanker is activated.

➥ Enters the noise blanker level set mode when pushed for 1 sec.

PANEL DESCRIPTION

1

@3 VOX/BREAK-IN SWITCH [VOX/BK-IN]

➥ In SSB, AM and FM modes, push momentarily to turn the VOX function ON and OFF (p. 54); push for 1 sec. to enter VOX set mode (p. 54).

➥ In CW mode, push momentarily to turn the semi break-in, full break-in or break-in OFF (p. 55); push for 1 sec. to enter break-in set mode

(p. 55).

✔ What is the VOX function?

The VOX function (voice operated transmission) starts transmission without pushing the transmit switch or PTT switch when you speak into the microphone; then, automatically returns to receive when you stop speaking.

✔ What is the break-in function?

Full break-in (QSK) activates the receiver between transmitted dots and dashes. This is useful when operating in nets, or during DX pileups and during contests, when “fast exchanges” are common.

@4 MONITOR SWITCH [MONITOR] (p. 56)

➥ Monitors your transmitted signal.

➥ Enters monitor set mode when pushed for

1 sec.

@5 FILTER SWITCH [FILTER] (p. 49)

➥ Selects one of 3 IF fi lter settings.

➥ Enters the fi lter set mode when pushed for 1 sec.

@6 CALL SWITCH [CALL] (p. 63)

Selects the call channel when pushed momentarily.

@7 TUNING DIAL (p. 21)

Changes the displayed frequency, selects set mode items, etc.

@8 LOCK/SPEECH SWITCH [LOCK/SPCH]

➥ Push momentarily to toggle the dial lock function

ON and OFF. (p. 52)

➥ Pushing for 1 sec. announces the selected readout frequency and S-meter indication when an optional UT-102 is installed. (p. 89)

@9 RIT/∂TX CONTROL [RIT/∂TX] (pgs. 47, 56)

Shifts the receive and/or transmit frequency without changing the transmit and/or receive frequency while the RIT and/or

∂TX functions are ON.

or rotate the control counterclockwise to decrease the frequency.

• The shift frequency range is ±9.99 kHz in 10 Hz steps.

RIT/

∂TX

Low shift High shift

#0 RIT SWITCH [RIT] (p. 47)

➥ Turns the RIT function ON and OFF when pushed.

• Use the [RIT/

∂TX] control to vary the RIT frequency.

➥ Adds the RIT shift frequency to the operating frequency when pushed for 1 sec.

✔ What is the RIT function?

The RIT (Receiver Incremental Tuning) shifts the receive frequency without shifting the transmit frequency.

This is useful for fi ne tuning stations calling you on an offfrequency or when you prefer to listen to slightly differentsounding voice characteristics, etc.

#1 CLEAR SWITCH [CLEAR] (pgs. 47, 56)

Clears the RIT/

∂TX shift frequency when pushed for 1 sec.

Quick RIT Clear is set to ON (p. 85).

#2 ∂TX SWITCH [∂TX] (p. 56)

➥ Turns the ∂TX function ON and OFF when pushed.

• Use the [RIT/

∂TX] control to vary the ∂TX frequency.

➥ Adds the ∂TX shift frequency to the operating frequency when pushed for 1 sec.

✔ What is the ∂TX function?

The

∂TX shifts the transmit frequency without shifting the receive frequency. This is useful for simple split frequency operation in CW, etc.

#3 MEMORY CHANNEL SELECTOR [M-CH] (p. 61)

Select a memory channel.

tate counterclockwise to decrease the memory channel.

#4 VFO/MEMORY SWITCH [VFO/MEMO]

➥ Switches the selected readout operating mode between the VFO mode and memory mode when pushed. (pgs. 20, 61)

➥ Transfers the memory contents to VFO when pushed for 1 sec. (p. 64)

#5 MEMORY CLEAR SWITCH [M-CL] (p. 62)

Clears the selected readout memory channel contents when pushed for 1 sec. in memory mode.

• The channel becomes a blank channel.

• This switch does not function in VFO mode.

#6 MEMORY WRITE SWITCH [MW] (p. 62)

Stores the selected readout frequency and operating mode into the displayed memory channel when pushed for 1 sec.

modes.

#7 PBT CLEAR SWITCH [PBTC] (p. 51)

Clears the PBT settings when pushed for 1 sec.

4

1

PANEL DESCRIPTION

■ Front panel

(continued)

i746PRO

NER ANT

NR NOTCH

NR

A

/NOTCH

AF

RF/SQL

%2

HF/VHF TRANSCEIVER

F 1

MENU

F 2

SSB

F 3

CW/RTTY

F 4

AM/FM

F 5

FILTER


CALL

%1 %0 $9 $8

TWIN PBT

1.8

1 3.5

2 7 3

10 4 14 5 18 6

21 7 24 8 28 9

GENE

50 0 144 ENT

XFC

MP-W

TX

MP-R

F-INP

SPLIT

A/B

TS

RX

LOCK

PBTC MW

V/M

M-CH

M-CL

RIT

∂TX

CLEAR

RIT/

¶TX

LOCK/

SPCH

$7

$6

$5

$4

$3

$2

$1

$0

#9

#8

#8 TRANSMIT FREQUENCY CHECK SWITCH [XFC]

(pgs. 45, 47)

Monitors the transmit frequency when pushed and held.

be changed with the tuning dial, keypad or memo pad.

cancels the dial lock function. (p. 59)

#9 MEMO PAD-WRITE SWITCH [MP-W] (p. 67)

Programs the selected readout frequency and operating mode into a memo pad.

$4 QUICK TUNING SWITCH [TS] (p. 21)

➥ Turns the quick tuning step ON and OFF.

quency can be changed in programmed kHz steps.

steps are available.

Quick tuning indicator

5 together with [XFC].

in set mode for your convenience. (p. 84)

$0 TRANSMIT INDICATOR [TX]

Lights red while transmitting.

$1 MEMO PAD-READ SWITCH [MP-R] (p. 67)

Each push calls up a frequency and operating mode in a memo pad. The 5 (or 10) most recently programmed frequencies and operating modes can be recalled, starting from the most recent.

in set mode for your convenience. (p. 84)

$2 RECEIVE INDICATOR [RX]

Lights green while receiving a signal and when the squelch is open.

$3 LOCK INDICATOR [LOCK] (p. 52)

Lights when the dial lock function is activated.

➥ While the quick tuning step is OFF, turns the 1

Hz step ON and OFF when pushed for 1 sec.

changed in 1 Hz steps.

➥ While the quick tuning step is ON, enters the quick tuning step set mode when pushed for

1 sec.

$5 VFO SELECT SWITCH [A/B] (p. 20)

➥ Push to toggle between VFO A and VFO B.

➥ Push for 1 sec. to equalize the frequency and operating mode of the two VFO’s.

PANEL DESCRIPTION

1

$6 SPLIT SWITCH [SPLIT]

➥ Turns the split function ON and OFF when pushed.(p. 58)

➥ Turns the quick split function ON, when pushed for 1 sec. (p. 59) quency. mode. (p. 82)

➥ Turns the split function ON and sets the transmit frequency after inputting an offset frequency with the keypad (±4 MHz in 1 kHz steps; p. 58).

$7 PASSBAND TUNING CONTROLS [TWIN PBT]

Adjust the receiver’s “passband width” of the DSP fi lter. (p. 51) multi-function switch indicator.

use.

width. 25 Hz steps and 50 Hz steps are available.

AM mode and when the RTTY fi lter is turned ON. Only the inner control may function in this case.

✔ What is the PBT control?

General PBT function electronically narrows the IF passband width to reject interference. This transceiver uses the DSP circuit for the PBT function.

TWIN PBT

PBT1

PBT2

%1 KEYPAD

➥ Pushing a key selects the operating band.

➥ Pushing the same key 2 or 3 times calls up other stacked frequencies and modes in the band.

(p. 19) quencies in each band.

➥ After pushing [F-INP], enter a keyed frequency.

Pushing [144 ENT] is necessary at the end.

(p. 22)

[GENE • ] [1.8 1] [28 9] [14 5] [144 ENT].

%2 LCD FUNCTION DISPLAY

(See pgs. 9, 10 for details.)

Shows the operating frequency, function switch menus, band scope screen, memory name screen, set mode settings, etc.

–

TWIN PBT TWIN PBT TWIN PBT

+

Low cut Center High cut

$8 SPLIT INDICATOR (p. 58)

Lights during split operation.

$9 FREQUENCY INPUT SWITCH [F-INP] (p. 22)

Push to toggle keypad input between frequency and band.

quency input is selected for the keypad.

%0 FREQUENCY INPUT INDICATOR (p. 22)

Lights when frequency input from the keypad is enabled.

6

1

PANEL DESCRIPTION

■ Rear panel

q w e r

7

!5

!4

!3

!2

q DC POWER SOCKET [DC 13.8V] (pgs. 14, 16)

Accepts 13.8 V DC through the supplied DC power cable (OPC-025D).

!1

Rear panel view w ANTENNA CONNECTOR [ANT 144MHz] e ANTENNA CONNECTOR 2 [ANT2] r ANTENNA CONNECTOR 1 [ANT1]

(pgs. 14, 15, 17, 75)

Accepts a 50

Ω antenna with a PL-259 connector.

• [ANT 144MHz] for 144 MHz (2 m) band only; [ANT1] and

[ANT2] for both HF and 50 MHz (6 m) bands antennas.

When using an optional AH-4

HF/50 MHz AUTO-

MATIC ANTENNA TUNER

, connect it to the [ANT1] connector. The internal antenna tuner activates for [ANT2] and deactivates for [ANT1] when connecting the AH-4.

t DATA SOCKET [DATA] (pgs. 15, 78)

Connects a TNC (Terminal Node Controller), etc. for data communications.

• See p. 8 for connector information.

y EXTERNAL SPEAKER JACK [EXT SP] (pgs. 15, 101)

Accepts a 4–8

Ω speaker.

u CI-V REMOTE CONTROL JACK [REMOTE] (p. 95)

➥ Designed for use with a personal computer for remote control of the transceiver functions.

➥ Used for transceive operation with another Icom

CI-V transceiver or receiver.

i SEND CONTROL JACK [SEND] (p. 17)

Goes to ground while transmitting to control external equipment such as a linear amplifi er.

!0

o i u y t before connecting to [SEND].

o ALC INPUT JACK [ALC] (p. 17)

Connects to the ALC output jack of a non-Icom linear amplifi er.

!0 ACCESSORY SOCKET 2 [ACC(2)]

!1 ACCESSORY SOCKET 1 [ACC(1)]

Enables connection of external equipment such as a linear amplifi er, an automatic antenna selector/ tuner, TNC for data communications, etc.

• See p. 8 for socket information.

!2 STRAIGHT KEY JACK [KEY] (p. 14)

Accepts a straight key or external electronic keyer with

1

⁄

4

inch standard plug.

straight key or external electronic keyer. Deactivate the internal electronic keyer in keyer set mode. (p. 34)

(

+)

(

_)

!3 TUNER CONTROL SOCKET [TUNER]

(pgs. 15, 77)

Accepts the control cable from an optional AH-4

HF/50 MHz AUTOMATIC ANTENNA TUNER

!5 GROUND TERMINAL [GND] (pgs. 13, 14)

Connect this terminal to a ground to prevent electrical shocks, TVI, BCI and other problems.

.

If you use an external electronic keyer, make sure the voltage retained by the keyer is less than 0.4 V when the key is ON.

!4 CALIBRATION POT [CAL] (p. 94)

This is used for frequency calibration.

• The transceiver has been adjusted and calibrated thoroughly at the factory. Under normal circumstances, the frequency does not need to be re-calibrated.

CAUTION: Be sure the linear amplifi ers keying circuit control voltage is compatible to the IC-7400,

PANEL DESCRIPTION

1

D DATA SOCKET

DATA PIN No. NAME DESCRIPTION

1 DATA IN Input terminal for data transmit. (1200 bps: AFSK/9600 bps: G3RUH, GMSK)

3

5

1 2

6

4

2

3

4 DATA OUT Data out terminal for 9600 bps operation only.

5

Rear panel view

6

GND

PTT P

AF OUT

Common ground for DATA IN, DATA OUT and AF OUT.

PTT terminal for packet operation. Connect ground to transmit data.

Data out terminal for 1200 bps operation only.

Squelch out terminal. Goes to ground when the squelch is opened. Goes high

(More than +6 V) when the squelch is closed.

P SQL

• transmission when receiving signals.

• Keep audio output at a normal level, otherwise a “P SQL” signal will not be output.

D ACC SOCKETS

DESCRIPTION

1 RTTY Controls RTTY keying

“High” level

“Low” level

Output current

SPECIFICATIONS

: More than 2.4 V

: Less than 0.6 V

: Less than 2 mA

2 GND Connects to ground. Connected in parallel with ACC(2) pin 2.

Input/output pin.

(HF/50 MHz only)

Ground level

Output current

3

HSEND Goes to ground when transmitting.

When grounded, transmits.

Input current (Tx)

: –0.5 V to 0.8 V

: Less than 20 mA

: Less than 200 mA

Connected in parallel with ACC(2) pin 3.

1

4

6

2

8

5

3

7

4 MOD

Modulator input.

Connects to a modulator.

Input impedance

Input level

: 10 k

Ω

: Approx. 100 mV rms

Rear panel view

AF detector output.

5 AF default settings. (see notes below)

Output impedance : 4.7 k

Ω

Output level : 100–300 mV rms

6 SQLS

Squelch output. SQL open

Goes to ground when squelch opens. SQL closed

: Less than 0.3 V/5 mA

: More than 6 V/100 µA

7 13.8 V 13.8 V output when power is ON.

Output current : Max. 1 A


8 ALC ALC voltage input.

Control voltage : –4 V to 0 V

Input impedance : More than 10 k

Ω


1

2 GND

DESCRIPTION

8 V Regulated 8 V output.

SPECIFICATIONS

Output voltage

Output current

: 8 V ±0.3 V

: Less than 10 mA

Same as ACC(1) pin 2.

1

4

6

2

5

3

7

3 HSEND

4 BAND

Band voltage output.

(Varies with amateur band)

Same as ACC(1) pin 3.

Output voltage : 0 to 8.0 V

5 ALC Same as ACC (1) pin 8.

Rear panel view

Input/output pin (144 MHz only) Ground level

6 VSEND Goes to ground when transmitting. Output current

When grounded, transmits.

: –0.5 V to +0.8 V

: Less than 20 mA

Input current (Tx) : Less than 200 mA

7 13.8 V Same as ACC(1) pin 7.

8

1

PANEL DESCRIPTION

■ LCD display

!4

!3

!2

!1

q w e r t

!0

o i u y

9 q FREQUENCY READOUTS

Shows the operating frequency.

w MULTI-FUNCTION METER INDICATION

➥ Shows receiving signal strength, etc. during receive.

➥ Shows transmit output power, ALC and SWR during transmit.

e VOX INDICATOR (p. 54)

Appears when the VOX function is activated. r MICROPHONE COMPRESSOR INDICATOR (p. 57)

Appears when the microphone compressor is activated. t MULTI-FUNCTION SWITCH INDICATOR (p. 11)

Indicates the functions assigned to the multi-function switches ([F1]–[F5]).

y DSP FILTER INDICATOR (p. 49)

Shows the selected IF fi lter.

u MEMORY CHANNEL READOUTS (p. 61)

Shows the selected memory channel.

i SELECT MEMORY CHANNEL INDICATOR (p. 71)

Appears when the selected memory channel is set as a select memory channel.

o BLANK MEMORY INDICATOR (p. 61)

Appears when the selected memory channel is blank.

!0

1

⁄

4

TUNING DIAL SPEED INDICATOR (p. 21)

Appears when the tuning dial speed is set so that one rotation is equal to

1

⁄

4

of the normal rotation.

!1 VOICE SQUELCH CONTROL INDICATOR (p. 53)

Appears during VSC (Voice Squelch Control) function is activated.

!2 MODE INDICATORS (p. 23)

Shows the selected operating mode.

• “

D” appears when SSB data, AM data or FM data mode is selected.

!3 ANTENNA INDICATOR (p. 74)

Indicates which antenna connector is used for HF/

50 MHz.

!4 ANTENNA TUNER INDICATORS (pgs. 75, 76)

➥ “TUNE” appears when the antenna tuner is ON;

“TUNE” appears and fl ashes during tuning.

➥ “EXT” appears when the optional AH-4 external antenna tuner is connected to [ANT1].

PANEL DESCRIPTION

1

■ LCD display

(continued)

@9

!5

!6

!7

!8

!9

@0

@8

@7

@6

@5

@4

@3

@2

@1

!5 BREAK-IN INDICATORS (p. 55)

➥ “F BK-IN” appears when the full break-in function is activated.

➥ “BK-IN” appears when the semi break-in function is activated.

!6 MONITOR INDICATOR (p. 56)

Appears when the monitor function is activated.

!7 PREAMP INDICATORS (p. 47)

Appears when the preamp is activated.

!8 ATTENUATOR INDICATOR (p. 47)

Appears when the attenuator is activated.

!9 AGC INDICATORS (p. 48)

Shows the selected AGC time constant.

slow; “-OFF” for AGC OFF.

@0 NOISE BLANKER INDICATOR (p. 50)

Appears when the noise blanker is activated.

@1 DTCS INDICATOR (p. 43)

Appears during DTCS operation.

@2 TONE SQUELCH INDICATORS

➥ “T” appears when the repeater tone is activated.

(p. 44)

➥ “TSQL” appears during tone squelch operation.

(p. 42)

@3 DUPLEX INDICATOR (p. 44)

“DUP–” or “DUP+” appears during repeater operation.

@4 NOISE REDUCTION INDICATOR (p. 52)

Appears when the noise reduction is activated.

@5 NOTCH INDICATORS (p. 52)

➥ “NOTCH” appears when the manual notch function is activated.

➥ “ANOTCH” appears when the automatic notch function is activated.

@6 SPLIT INDICATOR (pgs. 58, 59)

Appears during split operation.

@7 MEMORY INDICATOR (p. 61)

Appears during memory mode.

@8 VFO INDICATORS (p. 20)

Indicates whether VFO A or VFO B is selected.

@9 RIT/∂TX INDICATORS (pgs. 47, 56)

Appears during RIT or

∂TX operation and indicates the frequency offset.

10

11

1

PANEL DESCRIPTION

■ Multi function switches

D

M1 FUNCTIONS

During SSB operation

AGC

F 1

DUP

F 2

CMP

F 3

TBW

F 4

SCP

F 5

During SSB data operation

AGC

F 1

DUP

F 2

1/4

F 3

During CW operation

AGC

F 1

DUP

F 2

1/4

F 3

F 4

SCP

F 5

KEY

F 4

SCP

F 5

During RTTY operation

AGC

F 1

DUP

F 2

1/4

F 3

During AM operation

AGC

F 1

DUP

F 2

CMP

F 3

During FM operation

AGC

F 1

DUP

F 2

CMP

F 3

RTY

F 4

SCP

F 5

F 4

SCP

F 5

TON

F 4

SCP

F 5

1

⁄

4

TUNING FUNCTION (p. 21)

1/4

Push to turn the

1

⁄

4

tuning function ON/

F 3

OFF.

• “ ” indicator appears when the 1 ⁄

4

tuning function is ON.

TRANSMISSION BANDWIDTH (p. 57)

TBW

Push to select the transmission bandwidth.

• Bandwidth is selectable from narrow, middle

F 4

and wide.

MEMORY KEYER MENU (p. 29)

KEY

Push to select the memory keyer or keyer

F 4

send menu, depending on the KEYER

1st Menu setting in the set mode

(p. 86).

RTTY MENU (p. 36)

RTY Push to select the RTTY menu.

F 4

BAND SCOPE FUNCTION (p. 46)

SCP

Push to select the band scope screen.

F 5

D M2 FUNCTIONS

SCN

F 1

MEM

F 2

SWR

F 3

TCN

F 4

VSC

F 5

AGC (p. 48)

AGC

➥ Push momentarily to change the time

F 1

constant of the AGC circuit.

➥ Push for 1 sec. to enter to the AGC set mode.

DUPLEX (p. 44)

DUP

➥ Push momentarily to select the duplex direction or turn the function OFF.

F 2

• “DUP–” or “DUP+” indicator appears during duplex operation.

➥ Push for 1 sec. to turn the one-touch repeater function ON/OFF.

SPEECH COMPRESSOR (p. 57)

CMP

➥ Push momentarily to turn the speech compressor function ON/OFF.

F 3

• “COMP” indicator appears when the speech compressor is ON.

➥ Push for 1 sec. to enter to the compressor set mode.

SCAN MENU (p. 69)

SCN

Push to select the scan menu.

F 1

MEMORY NAME MENU (p. 66)

MEM

Push to select the memory name screen.

F 2

SWR GRAPH FUNCTION (p. 60)

SWR

Push to indicate the SWR graph screen.

F 3

TONE CONTROL SET MODE (p. 88)

TCN

Push to enter the audio tone set mode.

F 4

VSC FUNCTION (p. 53)

VSC

Push to turn the VSC (Voice Squelch Con-

F 5

trol) function ON and OFF.

PANEL DESCRIPTION

1

■ Microphone

(HM-36)

q w q UP/DOWN SWITCHES [UP]/[DN]

Change the selected readout frequency or memory channel.

channel number continuously.

can be controlled while in split frequency operation.

in the keyer set mode. (p. 34) w PTT SWITCH

Push and hold to transmit; release to receive.

• MICROPHONE CONNECTOR

(Front panel view) q Microphone input w +8 V DC output e Frequency up/down i Main readout AF output

(varies with [AF]/[BAL]) u GND

(Microphone ground) y GND (PTT ground) t PTT r Main readout squelch switch

[MIC]

Pin No.

FUNCTION DESCRIPTION

w

+8 V DC output Max. 10 mA e

Frequency down

Ground

Ground through 470

 r

Squelch open

Squelch closed

“Low” level

“High” level

CAUTION:

DO NOT short pin 2 to ground as this can damage the internal 8 V regulator.

NOTE: DC voltage is applied to pin 1 for microphone operation. Take care when using a non-Icom microphone.

• HM-36 SCHEMATIC DIAGRAM

MICROPHONE

MIC

ELEMENT

10

μ

+

4700p

2k

+

0.33

μ

4700p

MICROPHONE CABLE MICROPHONE PLUG

DOWN UP q w e i r u y t

PTT

RECEIVE

TRANSMIT

470

12

13

2

INSTALLATION AND CONNECTIONS

■ Unpacking

After unpacking, immediately report any damage to the delivering carrier or dealer. Keep the shipping cartons.

For a description and a diagram of accessory equipment included with the IC-7400, see ‘Supplied accessories’ on p. ii of this manual.

■ Antenna connection

For radio communications, the antenna is of critical importance, along with output power and sensitivity.

Select antenna(s), such as a well-matched 50

Ω antenna, and feedline. 1.5:1 or better of Voltage Standing Wave Ratio (VSWR) is recommended for your desired band. Of course, the transmission line should be a coaxial cable.

When using 1 antenna, use the [ANT1] connector.

CAUTION:

Protect your transceiver from lightning by using a lightning arrestor.

■ Selecting a location

Select a location for the transceiver that allows adequate air circulation, free from extreme heat, cold, or vibrations, and away from TV sets, TV antenna elements, radios and other electromagnetic sources.

The base of the transceiver has an adjustable stand for desktop use. Set the stand to one of two angles depending on your operating conditions.

PL-259 CONNECTOR INSTALLATION EXAMPLE

q

Coupling ring

30 mm

10 mm (soft solder)

Slide the coupling ring down. Strip the cable jacket and soft solder.

w e

10 mm

Soft solder

1–2 mm solder solder

Strip the cable as shown at left. Soft solder the center conductor.

Slide the connector body on and solder it.

r

Screw the coupling ring onto the connector body.

30 mm

≈

9

⁄

8

in 10 mm

≈

3

⁄

8

in 1–2 mm

≈

1

⁄

16

in

■ Grounding

To prevent electrical shock, television interference

(TVI), broadcast interference (BCI) and other problems, ground the transceiver through the GROUND terminal on the rear panel.

For best results, connect a heavy gauge wire or strap to a long earth-sunk copper rod. Make the distance between the [GND] terminal and ground as short as possible.

R WARNING: NEVER

connect the [GND] terminal to a gas or electric pipe, since the connection could cause an explosion or electric shock.

Antenna SWR

Each antenna is tuned for a specifi ed frequency range and SWR may be increased out-of-range.

When the SWR is higher than approx. 2.0:1, the transceiver’s power drops to protect the fi nal transistor. In this case, an antenna tuner is useful to match the transceiver and antenna. Low SWR allows full power for transmitting even when using the antenna tuner. The IC-7400 has an SWR meter to monitor the antenna SWR continuously.

INSTALLATION AND CONNECTIONS

2

■ Required connections

• Front panel

CW KEY

POWER

i7400

TUNER ANT

NR NOTCH

TRANSMIT

(dot)

(com)

(dash)

PHONES

ELEC-KEY

NR

A/NOTCH

AF RF/SQL

MIC

HF/VHF TRANSCEIVER

F 1

MENU

F 2

SSB

F 3

CW/RTTY

F 4

AM/FM

F 5

FILTER


CALL

TWIN PBT

1.8

1

10

4

3.5

2

14

5

7

3

18

6

21 7 24 8 28 9

GENE 50 0 144 ENT

MP-W MP-R

F-INP

SPLIT

A/B

TS

XFC

PBTC MW

V/M

M-CH

M-CL

RIT

∂TX

CLEAR

RIT/

∂TX

LOCK/

SPCH

A straight key can be used when the internal electronic keyer is turned OFF in keyer set mode. (p. 34)

MICROPHONES (p. 100)

HM-36 SM-20

(optional)

• Rear panel

144 MHz ANTENNA (pgs. 13, 74)

Connect a VHF

(60–144 MHz) antenna; impedance: 50

Ω.

ANTENNA 1, 2 (pgs. 13, 74)

[Example]: ANT1 for 1.8–18 MHz bands

ANT2 for 21–50 MHz bands

DC POWER SUPPLY

PS-125

(Optional)

GROUND (p. 13)

Use the heaviest gauge wire or strap available and make the connection as short as possible.

Grounding prevents electrical shocks, TVI and other problems.

STRAIGHT KEY

(

+)

(

_)

14

15

2


■ Advanced connections

• Front panel

HEADPHONES

POWER

i7400

TUNER ANT

NR NOTCH

TRANSMIT

PHONES

ELEC-KEY

NR

A/NOTCH

AF RF/SQL

MIC

HF/VHF TRANSCEIVER

F 1

MENU

F 2

SSB

F 3

CW/RTTY

F 4

AM/FM

F 5

FILTER


CALL

TWIN PBT

1.8

1 3.5

2 7 3

10 4 14 5 18 6

21 7 24 8 28 9

GENE 50 0 144 ENT

XFC

MP-W

TX

MP-R

F-INP

SPLIT

A/B

TS

RX

LOCK

PBTC MW

V/M

M-CH

M-CL

RIT

∂TX

CLEAR

RIT/

∂TX

LOCK/

SPCH

MIC

The AFSK modulation signal can be input from [MIC]. (p. 77)

• Rear panel

ANTENNA 1, 2 (p. 17)

Connects a linear amplifier, antenna selector, etc.

AH-2b

AH-4 (p. 76)

When using the AH-4, it must be connected to the [ANT1] connector.

[SEND], [ALC] (p. 17)

Used for connecting a non-Icom linear amplifier.

[DATA] (p. 77)

ACC SOCKETS (pgs. 8, 77)

[REMOTE] (p. 94)

Used for computer control and transceive operation.

EXTERNAL SPEAKER (p. 100)

SP-21

(optional)


2

■ Power supply connections

Use an optional DC power supply with a 25 A capacity and above when operating the transceiver with AC power. Refer to the diagrams below.

CAUTION:

Before connecting the DC power cable, check the following important items. Make sure:

• The [POWER] switch is OFF.

• Output voltage of the power source is 12–15 V when you use a non-Icom power supply.

• DC power cable polarity is correct.

Red :

+ terminal negative

CONNECTING PS-125 DC POWER SUPPLY

PS-125

Transceiver

Connect to an AC outlet using the supplied AC cable.

DC power socket

CONNECTING A DC POWER SUPPLY

• Connecting with OPC-025D

Transceiver

DC power cable

• Connecting with OPC-639

to DC power socket

Transceiver

Supplied DC power cable

(OPC-025D)

A DC power supply

13.8 V

; at least 23 A

Black

_

Red

+

AC outlet

AC cable

30 A fuses

CONNECTING A VEHICLE BATTERY

to ground terminal

Supplied

DC power cable

(OPC-639)

A DC power supply

13.8 V

; at least 23 A

Black

_

Red

+

AC outlet

AC cable

30 A fuses

NEVER connect

to a 24 V battery.

_ black

+ red

NOTE: Use terminals for the cable connections.

Crimp

Grommet

12 V battery

Solder

Supplied

DC power cable

NEVER connect

to a battery without supplied DC fuses, otherwise a fi re hazard may occur.

16

17

2


■ Linear amplifi er connections

CONNECTING THE IC-PW1/EURO

Use the [ANT1] connector when connecting a linear amplifi er.

Remote control cable

(supplied with the IC-PW1/EURO)

To an antenna ACC(1)

ACC cable


REMOTE

ANT

INPUT1

Coaxial cable


Be sure to connect the cable to the 7-pin ACC(2) jack.

ACC(2) EXCITER

1 1&2

ANT1

GND

GND

IC-PW1/EURO

AC outlet

(Non-European versions : 100–120/220–240 V

European version : 230 V)

Ground

Transceiver

Turn OFF the transceiver’s antenna tuner while tuning the IC-PW1/EURO’s tuner.

CONNECTING A NON-ICOM LINEAR AMPLIFIER

50

Ω coaxial cable

To an antenna

ANT1

Transceiver

RF OUTPUT RF INPUT

ALC

SEND

Non-Icom linear amplifier

ALC

SEND

R WARNING:

Set the transceiver output power and linear amplifi er ALC output level referring to the linear amplifi er instruction manual. Be sure the linear amplifi er keying circuit control voltage is compatible with the IC-

7400, before connecting to [SEND] jack.

The ALC input level must be in the range 0 V to

–4 V, and the transceiver does not accept positive voltage. Non-matched ALC and RF power settings could cause a fi re or ruin the linear amplifi er.

The specifi cations for the SEND relay are 16 V/DC

0.5 A. If this level is exceeded, a large external relay must be used.

■ External antenna tuner connection

CONNECTING THE AH-4

The AH-4 must be connected to [ANT1].

Long wire or optional AH-2b

Coaxial cable (from AH-4)

ANT1

Transceiver

Ground

AH-4

Control cable

BASIC OPERATION

3

■ When fi rst applying power

(CPU resetting)

Before fi rst applying power, make sure all connections required for your system are complete by referring to

Chapter 2. Then, reset the transceiver using the following procedure.

NOTE: When fi rst applying power or when operating in cold environments, the display may fl icker or appear faint. This is normal and will disappear once the transceiver has warmed up.

q Make sure the transceiver power is OFF.

w While pushing [M-CL] and [F-INP], push [POWER] for 1 sec. to turn power ON.

• The internal CPU is reset.

[POWER] resetting is complete.

e Correct the set mode settings after resetting, if desired.

Resetting CLEARS all programmed contents in memory channels and returns programmed values in set mode to default values.

[F-INP] [M-CL]

■ Initial settings

After resetting the transceiver, set controls and switches as shown in the fi gure below.

CW : Clockwise

CCW : Counterclockwise

[NR]: Max. CCW [NOTCH]: Max. CCW

POWER

i7400

TUNER ANT

NR NOTCH

TRANSMIT

HF/VHF TRANSCEIVER

[TRANSMIT]: OFF

[AF]: Max. CCW

[RF/SQL]: 12 o’clock

[MIC GAIN]: Max. CCW

PHONES

ELEC-KEY

NR

A/NOTCH

AF

RF/SQL

MIC

F 1

MENU

F 2

SSB

F 3

CW/RTTY

F 4

AM/FM

F 5

FILTER


CALL

TWIN PBT

1.8

1 3.5

2 7 3

10 4 14 5 18 6

21

7

24

8

28

9

GENE

50 0 144 ENT

F-INP

SPLIT

A/B

MP-W

XFC

TX

MP-R TS

RX

LOCK

PBTC MW

V/M

M-CH

M-CL

RIT

∂TX

CLEAR

RIT/

∂TX

LOCK/

SPCH

[RF PWR]: Max. CCW [CW PITCH]: 12 o’clock [KEY SPEED]: Max. CCW

18

19

3

BASIC OPERATION

■ Selecting an operating band

The transceiver has a triple band stacking register.

This means that the last 3 operating frequencies and modes used on a particular band are automatically memorized.

See the table below for a list of the bands available and the default settings for each register.

Band keys

BAND

1.8 MHz

3.5 MHz

7 MHz

10 MHz

14 MHz

18 MHz

21 MHz

24 MHz

28 MHz

50 MHz

144 MHz

General

REGISTER 1

1.900000 MHz CW

3.550000 MHz LSB

7.050000 MHz LSB

10.120000 MHz CW

14.100000 MHz USB

18.100000 MHz USB

21.200000 MHz USB

24.950000 MHz USB

28.500000 MHz USB

50.100000 MHz USB

145.000000 MHz FM

15.000000 MHz USB

REGISTER 2

1.910000 MHz CW

3.560000 MHz LSB

7.060000 MHz LSB

10.130000 MHz CW

14.200000 MHz USB

18.130000 MHz USB

21.300000 MHz USB

24.980000 MHz USB

29.500000 MHz USB

50.200000 MHz USB

145.100000 MHz FM

15.100000 MHz USB

D Using the band stacking registers

q Push [14 5], then select a frequency and an operating mode.

fi rst band stacking register.

w Push [14 5] again, then select another frequency and operating mode.

the second band stacking register.

e Push [14 5] again, then select another frequency and operating mode.

the third band stacking register.

lected on a band, the fi rst register set in step q, is overwritten.

[Example]: 14 MHz band

1.8

1 3.5

2 7 3

10 4 14 5 18 6

21

7

24

8

28

9

GENE 50

0

144

ENT

REGISTER 3

1.915000 MHz CW

3.580000 MHz LSB

7.020000 MHz CW

10.140000 MHz CW

14.050000 MHz CW

18.150000 MHz USB

21.050000 MHz CW

24.900000 MHz CW

28.100000 MHz CW

51.000000 MHz FM

145.200000 MHz FM

15.200000 MHz USB

■ Selecting VFO/memory mode

VFO is an abbreviation of Variable Frequency Oscillator, and is commonly referred to as a main tuning function. The tuning dial is often called the “VFO knob.”

➥ Push [V/M] to switch between VFO and memory modes.

selected memory channel to VFO mode (p. 65).

■ VFO operation

The transceiver has 2 VFOs and are called VFO A and

VFO B. You can use the desired VFO to call up a frequency and operating mode for your operation.

D Selecting the VFO A/B

➥ Push [A/B] to switch between the VFO A and

VFO B.

• “VFO A” or “VFO B” appears.

BASIC OPERATION

3

[V/M]

[A/B]

D VFO equalization

➥ Push [A/B] for 1 sec. to equalize the undisplayed

VFO condition to the displayed VFO.

Either one appears

CONVENIENT

Use two VFOs as a quick memory

When you find a new station, but you wish to continue searching, the Two VFO system can be used for quick memory storage.

q Push [A/B] for 1 sec. to store the displayed frequency into the undisplayed VFO.

w Continue searching for stations.

e Push [A/B] to retrieve the stored frequency.

r To continue searching for a station, push [A/B] again.

20

21

3

BASIC OPERATION

■ Frequency setting

The transceiver has several tuning methods for convenient frequency tuning.

D Tuning with the tuning dial

q Push the desired band key on the keypad 1–3 times.

with the band key. (p. 19) w Rotate the tuning dial to set the desired frequency.

If the dial lock function is activated, the lock indicator lights, and the tuning dial does not function. In this case, push [LOCK/SPCH] to deactivate the lock function. (see p. 52 for details)

D Quick tuning step

The operating frequency can be changed in kHz steps

(0.1, 1, 5, 9, 10, 12.5, 20 or 25 kHz selectable) for quick tuning.

q Push [SSB], [CW/RTTY] or [AM/FM] to select the desired operation mode.

w Push [TS] momentarily to activate the quick tuning function.

e Push [TS] for 1 sec. to enter the tuning step set mode.

r Rotate the tuning dial to select the desired tuning step.

t Push [TS] to exit the tuning step set mode.

D

1

⁄

4

Tuning step function (SSB data, CW and RTTY only)

While operating in SSB data/CW/RTTY, the

1

⁄

4

function is available for critical tuning. Dial rotation is reduced to

1

⁄

4

of normal when the

1

⁄

4

function is in use.

➥ While M1 is selected with [MENU], push [F3 1/4] to toggle the 1 ⁄

4

function ON and OFF.

Select mode

Band keys

Tuning dial

[TS]

S S B

1 k H z

1

⁄

4

indicator

D Auto tuning step function

When rotating the tuning dial rapidly, the tuning step automatically changes several times as selected. q Push [MENU] for 1 sec. to enter the set mode.

w Push [F1≤] or [F2 ≥] to select the DIAL Auto

TS item.

e Rotate the tuning dial to select the function

ON (HIGH or LOW) and OFF.

D I A L A u t o T S

2 7 H I G H r Push [MENU] to exit the set mode.

BASIC OPERATION

3

D Selecting the 1 Hz step

The minimum tuning step of 1 Hz can be used for fi ne tuning.

q Push [TS] momentarily to turn the quick tuning step

OFF w Push [TS] for 1 sec. to toggle the 1 Hz tuning step

ON and OFF.

[TS]

1 Hz indicator

D Band edge warning beep

When selecting a frequency that lies outside of a band’s specified frequency range, a warning beep sounds.

This function can be turned OFF in set mode, if desired. (p. 81)

D Frequency setting with the keypad

The transceiver has a keypad for direct frequency entry as described below.

q Push [F-INP].

• F-INP indicator lights w Input the desired frequency.

kHz units.

e Push [144 ENT] to enter the input frequency.

• To cancel the input, push [A/B] instead of [144 ENT].

[EXAMPLE]

14.025 MHz

Push

F-INP

1.8

1

10

4

GENE

Lights when keypad input is activated.

Keypad [F-INP]

50 0 3.5

2

14

5 144 ENT

706 kHz

Push

F-INP

50 0

GENE

21 7 50 0 18 6 144 ENT

21.280 MHz 21.245 MHz

Push

F-INP

GENE 3.5

2

10

4

14

5

144 ENT

22

23

3

BASIC OPERATION

■ Operating mode selection

SSB (USB/LSB), SSB data (USB data/LSB data), CW,

CW reverse (CW-R), RTTY, RTTY-R (RTTY reverse),

AM, AM data, FM and FM data modes are available in the IC-7400. Select the desired operation mode as follows.

To select a mode of operation, push the desired mode switch momentarily. Push the switch again to toggle between USB and LSB, CW/CW-R and RTTY/RTTY-

R, AM and FM, if necessary. Push the switch for 1 sec. to toggle between CW and CW-R, RTTY and RTTY-R, or to select data mode, if necessary.

See the diagram below right for the order of selection.

Microphone signals are muted when data mode is selected.

• Selecting SSB mode

➥ Push [SSB] to select USB or LSB.

lected fi rst when below 10 MHz operation.

tween USB and LSB.

select USB data or LSB data mode, respectively.

• Selecting CW/RTTY mode

➥ Push [CW/RTTY] to select CW or RTTY.

[CW/RTTY] to toggle between CW and RTTY.

1 sec. to toggle between CW and CW reverse, or, RTTY and RTTY reverse mode, respectively.

• Selecting AM/FM mode

➥ Push [AM/FM] to select AM or FM.

tween AM and FM mode.

select AM data or FM data mode, respectively.

■ Volume setting

➥ Rotate [AF] control to output a suitable audio level.

AF RF/SQL

Decreases Increases

No audio output

Max. audio output

[SSB] [CW/RTTY] [AM/FM]

D USB

CW-R

D AM

Push mode switch for 1 sec.

USB

SSB

LSB

CW

CW/RTTY

RTTY

AM

AM/FM

FM

D LSB

RTTY-R

D FM

Push mode switch momentarily.

[AF] control

BASIC OPERATION

3

■ Squelch and receive (RF) sensitivity

Adjusts the RF gain and squelch threshold level.

The squelch removes noise output from the speaker

(closed position) when no signal is received.

• The squelch is particularly effective for FM. It is also available for other modes.

• The control can be set as the RF gain control only (squelch is fi xed open) or squelch control (RF gain is fi xed at maximum) in set mode (p. 81). See below right.

• The 11 to 12 o’clock position is recommended for any setting of the [RF/SQL] control.

[RF/SQL] control

• When setting as RF gain/squelch control


SET MODE OPERATION

(default)

Can be used in all modes.

RF+SQL Functions as noise squelch or S-meter squelch in AM and FM; S-meter squelch only in other modes.

SQL

➥ Operates as a squelch control.

• RF gain is fi xed at max. sensitivity.

➥ Operates as an RF gain control in

SSB, CW and RTTY.

AUTO

• Squelch is fi xed open.

➥ Operates as a squelch control in

AM and FM.

• RF gain is fi xed at max. sensitivity.

Squelch is open.

RF gain adjustable range

Recommended level

Maximum

RF gain

S-meter squelch

• When functioning as RF gain control

(Squelch is fi xed open; SSB, CW, RTTY only)

Maximum

RF gain

Adjustable range

Adjusting RF gain ( Receive sensitivity)

Normally, [RF/SQL] is set to the 11 o’clock position.

Rotate [RF/SQL] to the 11 o’clock position for maximum sensitivity.

• Rotating counterclockwise from the maximum position reduces sensitivity.

• The S-meter indicates receive sensitivity.

Minimum RF gain

• When functioning as squelch control

(RF gain is fi xed at maximum)

Noise squelch threshold

(FM mode)


S-meter squelch threshold

Squelch is open.

S-meter squelch

Adjusting squelch

( Removing non-signal noise)

Rotate [RF/SQL] clockwise when receiving no signal, until the noise just disappears.

• [RX] indicator light goes out.

• Rotating [RF/SQL] past the threshold point invokes the Smeter squelch— this allows you to set a minimum signal level needed to open the squelch.

Shallow Deep

24

25

3

BASIC OPERATION

■ Basic transmit operation

Before transmitting, monitor your selected operating frequency to make sure transmitting won’t cause interference to other stations on the same frequency. It’s good Amateur practice to listen fi rst, and then, even if nothing is heard, ask “is the frequency in use” once or twice, before you begin operating on that frequency.

D Transmitting

Before transmitting, monitor your selected operating frequency to make sure transmitting won’t cause interference to other stations on the same frequency.

q Push [TRANSMIT] or [PTT] (microphone) to transmit.

• The [TX] indicator lights red.

w Push [TRANSMIT] again or release [PTT] (microphone) to return to receive.

[TRANSMIT]

[MIC GAIN] [RF PWR]

[TX] indicator

D Microphone gain adjustment

Before transmitting, monitor your selected operating frequency to make sure transmitting won’t cause interference to other stations on the same frequency.

q Push [PTT] (microphone) to transmit.

• Talk into the microphone at your normal voice level.

w While talking into the microphone, rotate [MIC

GAIN] so that the ALC meter reading doesn’t go outside the ALC zone (see right).

e Release [PTT] (microphone) to return to receive.

ALC zone

RECEIVE AND TRANSMIT

4

■ Operating SSB

q Push a band key to select the desired band.

w Push [SSB] to select LSB or USB.

10 MHz USB is automatically selected.

e Rotate [AF] to set audio to a comfortable listening level.

r Rotate the tuning dial to tune a desired signal.

• S-meter indicates received signal strength.

t Push [TRANSMIT] or [PTT] (microphone) to transmit.

• The TX indicator lights red.

y Speak into the microphone at your normal voice level.

• Adjust [MIC GAIN] at this step, if necessary.

u Push [TRANSMIT] or release [PTT] (microphone) to return to receive.

[TRANSMIT] [TX] indicator Band keys

[MIC GAIN] [SSB] Tuning dial

“LSB” or “USB” appears

D Convenient functions for receive

• Preamp and attenuator (p. 47)

➥ Push [P.AMP/ATT] several times to set the preamp OFF, preamp 1 ON or preamp 2 ON.

• “P.AMP

1,” “P.AMP2” or “P.AMP” appears when the preamp 1, preamp 2 or preamp is set to ON, respectively. (depending on operating frequency band)

➥ Push [P.AMP/ATT] for 1 sec. to set the attenuator ON.

• Push [P.AMP/ATT] momentarily to turn the attenuator OFF.

• “ATT” appears when the attenuator is set to ON.

• Noise blanker (p. 50)

➥ Push [NB] to turn the noise blanker ON and OFF.

• “NB” appears when the noise blanker is set to ON.

• Push [NB] for 1 sec. to enter noise blanker set mode.

• Noise reduction (p. 52)

➥ Push [NR] to turn the noise reduction ON and OFF.

• Rotate [NR] control to adjust the noise reduction level.

• “NR” appears when the noise reduction is set to ON.

• Auto notch fi lter (p. 52)

➥ Push [A/NOTCH] to turn the auto or manual notch function ON and OFF.

• Rotate [NOTCH] control to set the attenuating frequency for manual notch operation.

• Twin PBT (passband tuning) (p. 51)

➥ Rotate [TWIN PBT] controls (inner/outer).

• Push [PBTC] to clear the settings.

• AGC (auto gain control) (p. 48)

➥ While M1 is selected with [MENU], push [F1 AGC] several times to select AGC

F, AGC M, AGC S or AGC OFF.

• VSC (voice squelch control) (p. 53)

➥ While M2 is selected with [MENU], push [F5 VSC] to turn the VSC function ON and OFF.

• The VSC indicator appears when the voice squelch function is set to ON.

D Convenient functions for transmit

• Speech compressor (p. 57)

➥ While M1 is selected with [MENU], push [F3 CMP] to turn the speech compressor ON and OFF.

• “COMP” appears when the speech compressor is set to ON.

• VOX (voice operated transmit) (p. 54)

➥ Push [VOX/BK-IN] to turn the VOX function ON and OFF.

• “VOX” appears when the VOX function is set to ON.

• Transmit quality monitor (p. 56)

➥ Push [MONITOR] to turn the monitor function ON and OFF.

• “MONI” appears when the monitor function is set to

ON.

• Audio tone control (p. 88)

➥ While M2 is selected with [MENU], push [F4

TCN], select an item with [F1 ≤] and [F2 ≥] then rotate the tuning dial to adjust the audio tone.

26

27

4

RECEIVE AND TRANSMIT

■ Operating CW


w Push [CW/RTTY] to select CW.

to toggle between CW and CW-R modes.


r Rotate the tuning dial to simultaneously tune a desired signal and its side tone.


t Push [TRANSMIT] to transmit.


y Use the electric keyer or paddle to key your CW signals.

u Adjust CW speed with [KEY SPEED]. i Push [TRANSMIT] to return to receive.


[CW PITCH]

[KEY SPEED]

[CW/RTTY]

Tuning dial

“CW” or “CW-R” appears




• “P.AMP


➥ Push [P.AMP/ATT] for 1 sec. to set the attenuator

ON.

• Push [P.AMP/ATT] momentarily to turn the attenuator

OFF.











➥ Push [A/NOTCH] to turn the auto or manual notch function ON and OFF.








• 1 ⁄

4

function (p. 21)

➥ While M1 is selected with [MENU], push [F3 1/4] to turn the 1 ⁄

4



• Break-in function (p. 55)

➥ Push [VOX/BK-IN] several times to set the breakin OFF, semi break-in or full break-in.

• “BK-IN” or “

F BK-IN” appears when the semi breakin or full break-in is set to ON, respectively.


4

D About CW reverse mode

CW reverse mode receives CW signals with a reverse side CW carrier point like that of LSB and USB modes.

Use when interfering signals are near a desired signal and you want to change the interference tone.

q Push [CW/RTTY] several times to select CW mode.

w Push [CW/RTTY] for 1 sec. to select CW or CW-R mode.

• Check the interfering tone.

D About CW pitch control

The received CW audio pitch and monitored CW audio can be adjusted to suit your preference (300 to 900 Hz in 25 Hz steps) without changing the operating frequency.

Push for 1 sec.

CW/RTTY

Interference

BFO

Desired signal

BFO

Interference Desired signal

CW mode (LSB side) CW-R mode (USB side)

[CW PITCH]

D About keying speed

The transceiver’s internal electronic keyer speed can be adjusted from 6 to 60 wpm.

➥ Rotate [KEY SPEED] clockwise to increase keying speed; counterclockwise to decrease keying speed.

[KEY SPEED]

D CW side tone function

When the transceiver is in the receive condition (and the break-in function is OFF— p. 55) you can listen to the tone of your CW signal without actually transmitting. This allows you to match your transmit signal exactly to another station’s. This also convenient for CW practice. CW side tone level can be adjusted in keyer set mode (p. 33).

28

29

4


■ Electronic keyer functions

The transceiver has a number of convenient functions for the electronic keyer that can be accessed from the memory keyer menu.

q Push [CW/RTTY] to select CW mode.

w Push [MENU] to select M1.

e Push [F4 KEY] to select the memory keyer menu.

• The selectable menu can be changed with the keyer send menu in the set mode. (p. 86) r Push one of the multi-function keys ([F1] to [F5]) to select an item in the memory keyer menu. See the diagram below.

• Push [MENU] to return to the previous indication.

D IN CW MODE

[MENU] [CW/RTTY]

• Keyer send menu (p. 30)

Push

[F2]

M 1 M 2 M 3 M 4 - 1

F 1 F 2 F 3 F 4 F 5

Push

[F3]

• Edit menu (p. 31)

C Q T E S T C Q T E S T

M 1 ç å D E L S P C

F 1 F 2 F 3 F 4 F 5

A G C D U P 1 / 4 K E Y S C P

F 1 F 2 F 3 F 4 F 5

Push [F4]

Push [MENU]

• Memory keyer menu

F 1

S N D E D T 0 0 1 S E T

F 2 F 3 F 4 F 5

Push

[F4]

• Contest number set mode (p. 32)

1

N u m b e r S t y l e

N o r m a l

F 1 F 2 F 3 F 4 F 5

Push

[F5]

• Keyer set mode (p. 33)

1

S i d e T o n e L e v e l

5 O %

F 1 F 2 F 3 F 4 F 5


4

D Memory keyer send menu

Pre-set characters can be sent using the keyer send menu. Contents of the memory keyer are set using the edit menu.

• Transmitting

q While M1 is selected in CW mode, push [F4 KEY] to select the memory keyer menu.

w Push [F2 SND] to select the keyer send menu.

e Push [TRANSMIT] to set the transceiver to transmit, or set the break-in function ON (p. 55).

r Push one of the function keys ([F1] to [F4]) to send the contents of the memory keyer.

• Pushing a function key for 1 sec. repeatedly sends the contents; push any function key to cancel the transmission.

• The contest number counter, above [F5], is incremented each time the contents are sent.

• Push [F5] to reduce the contact number count by 1 when resending contents to unanswered calls.

For your information

When an external keypad is connected to the pin 3 and pin 7 of the [MIC] connector, the programmed contents, M1—M4, can be transmitted without selecting the keyer send menu.

See p. 86 for details.

t Push [MENU] 2 times to return to M1.

M1 send indication

C Q T E S T C Q 0 0 1

M 2 M 3 M 4 - 1

F 1

Repeat send indication

C Q T E S T C Q 0 0 1

M 2 M 3 M 4 - 1

Repeat indicators

M3 send indication

C F M T U 0 0 1

M 1 M 2 M 4 - 1

F 3

0 0 1

M 1 M 2 M 3 M 4 - 1

F 1 F 2 F 3 F 4 F 5

M2 send indication

U R 5 N N 0 0 1 B 0 0 1

M 1 M 3 M 4 - 1

F 2

M2 send indication

U R 5 N N 0 0 1 B 0 0 1

M 1 M 3 M 4 - 1

Count up trigger indicator

Counter

M4 send indication

Q R Z ?

M 1 M 2 M 3

F 4

- 1

30

31

4


D Editing a memory keyer

The contents of the memory keyer memories can be set using the memory keyer edit menu. The memory keyer can memorize and re-transmit 4 CW key codes for often-used CW sentences, contact numbers, etc.

Total capacity of the memory keyer is 50 characters per memory channel.

• Programming contents

q Push [MENU] to select M1, then push [F4 KEY] to select the memory keyer menu. w Push [F3 EDIT] to select edit menu.

• Memory keyer contents of the Channel 1 (M1) is indicated.

• Push [F5] to manually increment the contest number.

e Push [F1] to select the desired memory keyer channel to be edited.

r Input the desired character by rotating the tuning dial or by pushing the keypad for number input.

• Selectable characters (with the tuning dial);

A B C D E F G H I J K L M N O P Q R S T

U V W X Y Z / ? . , * ^

NOTE:

“

^

” is used to transmit a following word with no space such as

AR

. Put “

^

” before a text string such as ^AR, and the string “

AR

” is sent with no space.

“

*

” is used to insert the CW contact number. The contact number automatically increments by 1.

This function is only available for one memory keyer channel at a time. Memory keyer channel

M2 used “

*

” by default.

t Push [F2 ç] or [F3 å] to move the cursor backwards or forwards, respectively.

y Repeat steps r and t to input the desired characters.

u Push [MENU] 2 times to return to M1.

Pre-programmed contents

CH Contents

M1 CQ TEST CQ TEST DE JA1 JA1 TEST

M2 UR 5NN* BK

M3 CFM TU

M4 QRZ?

• Edit menu

C Q T E S T C Q T E S T


F 1 F 2 F 3 F 4 F 5

Move cursor left/right

Select M1 to M4

Input space

Clear character

• M2 default indication

U R 5 N N * B K


When inputting an asterisk, the counter is incremented by 1.


C F M T U



Q R Z ?


Example display— when inputting ÒQSL TU

DE JA3YUA TESTÓ into M3.

Q S L T U D E J A 3 Y


D E J A 3 Y U A T E S T



4

D Contest number set mode

This menu is used to set the contest (serial) number and count up trigger, etc.

• Setting contents

q Push [MENU] to select M1, then push [F4 KEY] to select the memory keyer menu. w Push [F4 001] to enter the contest number set mode.

e Push [F1≤] or [F2 ≥] to select the desired set item.

r Set the desired condition using the tuning dial.

• Push [F3] for 1 sec. to select a default condition or value.


F 1

1


5 O %

F 2 F 3 F 4 F 5

Set item up/down

1. Number Style

This item sets the numbering system used for contact

(serial) numbers— normal or morse cut numbers.

• : Does not use morse cut number

(default)

• 190 ANO : Sets 1 as A, 9 as N and 0 as O.

• 190 ANT : Sets 1 as A, 9 as N and 0 as T.

• 90 NO : Sets 9 as N and 0 as O.

• 90 NT : Sets 9 as N and 0 as T.

2. Count Up Trig

This selects which of the four memory slots will have the contest serial number exchange. The count up trigger allows the serial number to e automatically incremented after each complete serial number exchange is sent.

• M1, M2, M3 and M4 can be set. (default: M2)

3. Present Number

This item shows the current number for the count up trigger channel set above.

• Rotate the tuning dial to change the number, or push

[F3 CLR] for 1 sec. to reset the current number to 001.

1

N u m b e r S t y l e

N o r m a l

2

C o u n t U p T r i g

M 2

3

P r e s e n t N u m b e r

C L R 0 0 1

32

4


D Keyer set mode

This set mode is used to set the CW side tone, memory keyer repeat time, dash weight, paddle specifi cations, keyer type, etc.


q Push [MENU] to select M1, then push [F4 KEY] to select the memory keyer menu. w Push [F5 SET] to select keyer set mode.





F 1

1


5 O %

F 2 F 3 F 4 F 5

Set item up/down

1. Side Tone Level

This item sets the CW side tone output level.

• 0 to 100% in 1% steps can be selected.

1


5 O %

33

2. Side Tone L-lmt

This item sets the CW side tone level limit. When the

[AF] control is rotated above a specifi ed level, the CW side tone does not increase.

ON CW side tone level is limited. (default)

OFF CW side tone level is not limited.

3. Repeat Time

When sending CW using the repeat timer, this item sets the time between transmission.

• 1 to 60 sec. in 1 sec. steps can be selected.

2

S i d e T o n e L - l m t

O N

3

R e p e a t T i m e

2 s

4. Dot/Dash Ratio

This item sets the dot/dash ratio.

• 1:1:2.8 to 1:1:4.5 (in 0.12 steps) can be selected.

Keying weight example: Morse code “K”

Weight setting:

1:1:3 (default)

DASH

DOT (fixed*)

DASH

Weight setting:

Adjusted

Adjustable range SPACE (fixed*)

4

D o t / D a s h R a t i o

1 : 1 : 3 . O

*SPACE and DOT length can be

adjusted with [KEY SPEED] only.

5. Rise Time

This item sets the envelop time period which the output power becomes the set transmit power.

• 2, 4, 6 or 8 msec. can be selected.

• About rise time

Tx

Key action

Rx

Tx output power

Set Tx power level

Time

6. Paddle Polarity

This item sets the paddle polarity.

• Normal and reverse polarity can be selected.

7. Keyer Type

This item selects the keyer type for [ELEC-KEY] connector on the front panel.

• ELEC-KEY, BUG KEY and Straight key can be selected.

8. MIC U/D Keyer

This item allows you to set the microphone [UP]/[DN] keys to be used as a paddle.

ON [UP]/[DN] switches can be used for CW.

OFF [UP]/[DN] switches cannot be used for

CW.

NOTE: When “ON” is selected, the frequency and memory channel cannot be changed using the [UP]/[DN] switches.


4

5

R i s e T i m e

4 m s

6

P a d d l e P o l a r i t y

N O R M A L

7

K e y e r T y p e

E L E C - K E Y

8

M I C U / D K e y e r

O F F

34

35

4


■ Operating RTTY (FSK)

Before operating RTTY, be sure to consult the manual that comes with your TNC.


w Push [CW/RTTY] several times to select RTTY.

1 sec. to toggle RTTY and RTTY-R modes.




ing RTTY-R mode.

t Push [TRANSMIT] to set the transceiver to the transmit condition or transmit a SEND signal from your TNC.


y Operate the connected PC or TNC (TU) to transmit

RTTY (FSK) signals.


u Push [TRANSMIT] to return to receive.


[CW/RTTY]

“RTTY” or “RTTY-R” appears

Tuning dial




• “P.AMP















• Push [PBT C] to clear the settings.




• 1 ⁄

4

function (p. 21)

➥ While M1 is selected with [MENU], push [F3 1/4] to turn the 1 ⁄

4





• “MONI” appears when the monitor function is set to ON.


4

■ RTTY functions

The transceiver has a number of convenient functions for the RTTY operation that can be accessed from the

RTTY menu.

q Push [CW/RTTY] to select RTTY mode.


e Push [F4 RTY] to select the RTTY menu.

r Push one of the multi-function keys ([F2], [F4] or

[F5]) to select an item in the RTTY menu. See the diagram below.

• Push [MENU] to return to the previous indication.

D IN RTTY MODE

[MENU] [CW/RTTY]

Switches RTTY filter ON and OFF.

A G C D U P 1 / 4 R T Y S C P

F 1 F 2 F 3 F 4 F 5

Push [F4]

• RTTY menu

R T T Y - F I L O N

D E C F I L S E T

F 1 F 2 F 3 F 4 F 5

Push [F2]

• RTTY decoder screen (p. 38)

D E C F I L S E T

F 1 F 2 F 3 F 4 F 5

Push

[F4]

Push

[F4] for

• RTTY filter set mode (p. 37)

1 sec.

B a n d W i d t h

1 3 5 O

F 1 F 2 F 3 F 4 F 5

A D J

F 1 F 2 F 3 F 4 F 5

D About RTTY reverse mode

Received characters are occasionally garbled when the receive signal is reversed between MARK and

Space. This reversal can be caused by incorrect TNC connections, setting, commands, etc. To receive reversed RTTY signals correctly, select RTTY-R mode.

➥ While RTTY mode is selected, push [CW/RTTY] for 1 sec. to select the RTTY reverse mode.

• “RTTY-R” appears when the RTTY reverse mode is selected.

• Push [CW/RTTY] for 1 sec. again to select the normal

RTTY mode.

Push

[F5]

• RTTY set mode (p. 39)

1

R T T Y M a r k

F 1 F 2 F 3 F 4

2 1 2 5

F 5

Normal

170 Hz

2125 Hz

Space

Mark

BFO

Reverse

2125 Hz

170 Hz

BFO Space

Mark

36

37

4


D RTTY fi lter/Twin peak fi lter

The transceiver has 5 RTTY fi lters in addition to normal IF fi lters. The passband width can be selected from 1 kHz, 500 Hz, 350 Hz, 300 Hz and 250 Hz.

When the RTTY fi lter is turned ON, the RTTY tuning meter can be used.

Moreover, the twin peak fi lter changes the receive frequency response by boosting 2 particular frequencies (2125 and 2295 Hz) for better copying of desired

RTTY signals.

• RTTY fi lter and twin peak fi lter setting


1 sec. to select RTTY-R mode.

w Push [MENU] several times to select M1.

e Push [F4 RTY] to select RTTY menu.

r Push [F4 FIL] to turn the RTTY fi lter ON and OFF.

• When the RTTY fi lter is turned ON, the normal IF fi lter number indication (

1, 2 or 3) disappears.

t Push [F4 FIL] for 1 sec. to enter RTTY fi lter set mode (see below).

y Push [F1≤] to select bandwidth item.

u Rotate the tuning dial to select the RTTY fi lter width from 1 kHz, 500 Hz, 350 Hz, 300 Hz and 250 Hz.

• Push [F3] for 1 sec. to select a default value.

i Push [F2 ≥] to select twin peak fi lter item.

• The received audio volume may become greater when the twin peak fi lter is turned ON.

o Rotate the tuning dial to turn the twin peak fi lter function ON and OFF.

!0 Push [MENU] 2 times to return to M1.

• RTTY fi lter set mode

1. Band Width

This item sets the RTTY fi lter width.

• 250, 300, 350, 500 Hz and 1 kHz can be selected.

2. Twin Peak FIL

This item turns the twin peak fi lter ON and OFF.


F 3 F 4 F 5 F 1 F 2

RTTY filter indicator

Rotate the tuning dial to the point where both sides of the dots appear equally.

Push [F4]

R T T Y - F I L O N

D E C F I L S E T

F 4 F 5 F 1 F 2 F 3

Disappears when the RTTY filter is turned OFF.

1

B a n d W i d t h

3 5 O

2

T w i n P e a k F I L

O N


4

D RTTY decoder

The transceiver has an RTTY decoder for Baudot

(mark freq.: 2125 Hz, shift freq.: 170 Hz, 45 bps).

An external terminal unit (TU) or terminal node connector (TNC) is not necessary for receiving a Baudot signal.


1 sec. to select RTTY-R mode.


e Push [F4 RTY] to select RTTY menu.

r Push [F4 FIL] to turn the RTTY fi lter ON.

• The RTTY decoder does not function when the RTTY fi lter is turned OFF. t Push [F2 DEC] to turn the RTTY decoder ON.

• RTTY decoder screen appears.

y Push [F2] to freeze the current screen.

• “

H” appears while the function is in use.

u Push [F3] for 1 sec. to clear the displayed characters.

i Push [MENU] to exit the RTTY decoder screen.


F 1 F 2 F 3 F 4 F 5

Push [F4]

F 1

Push [F2]

R T T Y - F I L O N

D E C F I L S E T

F 2 F 3 F 4 F 5

A D J

F 1 F 2 F 3 F 4 F 5

Appears while the RTTY decoder screen is freezed with [F2] operation.

Push [F3] to erase the displayed characters.

• Setting the decoder threshold level

Adjust the RTTY decoder threshold level if some characters are displayed when no signal is received.

q Call up the RTTY decoder screen as described above.

w Push [F1 ADJ] to select the threshold level setting condition.

e Rotate the tuning dial to adjust the RTTY decoder threshold level.

• Push [F3] for 1 sec. to select the default condition.

r Push [MENU] to exit the RTTY decoder screen.

The number of line of text can be selected from 2 or

3 in the display. The UnShift On Space (USOS) function and new line code can be set in the RTTY set mode. (p. 39)

A D J

F 1 F 2

Push [F1]

F 3 F 4

å 9

F 1 F 2 F 3

Threshold level indication

F 4

F 5

F 5

38

39

4


D RTTY set mode

This set mode is used to set the mark and shift frequencies, keying type, decode USOS function, etc.


q Push [MENU] to select M1, then push [F4 RTY] to select the RTTY menu. w Push [F5 SET] to select RTTY set mode.





F 1

1

R T T Y M a r k

F 2 F 3 F 4

2 1 2 5

F 5

Set item up/down

1. RTTY Mark

Sets the mark frequency for RTTY operation.

• 1275, 1615 and 2125 Hz are selectable.

2. RTTY Shift

Sets the shift frequency for RTTY operation.

• 170, 200 and 425 Hz are selectable.

3. RTTY Keying

Selects the keying polarity from normal and reverse.

NORMAL Key open/close = Mark/Space

REVERSE Key open/close = Space/Mark

4. Decode USOS

Turn the USOS

(UnShift On Space)

function ON/OFF

ON Decode as letter code

OFF Decode as character code

5. Decode New Line

Selects the new line code of the internal RTTY decoder.

CR: Carriage Return; LF: Line Feed

CR,LF,CR+LF CR, LF and CR+LF

CR+LF CR+LF only

6. Decode Screen

Selects the number of the decoder indication from 2 or 3 lines.

1

R T T Y M a r k

2 1 2 5

2

R T T Y S h i f t

1 7 O

3

R T T Y K e y i n g

N O R M A L

4

D e c o d e U S O S

O N

5

D e c o d e N e w L i n e

C R , L F , C R + L F

6

D e c o d e S c r e e n

3 l i n e


4

■ Operating AM


w Push [AM/FM] to select AM.




changed using the tuning step program mode. (p. 21) t Push [TRANSMIT] or [PTT] (microphone) to transmit.






[MIC GAIN] [AM/FM] Tuning dial

Appears




• “P.AMP





















➥ Push [A/NOTCH] to turn the auto or manual notch fi lter ON and OFF.


• IF shift (p. 51)

➥ Rotate [TWIN PBT] controls (inner only).




AGC] several times to select AGC

F, AGC M,

AGC

S or AGC OFF.







ON.




40

41

4


■ Operating FM


w Push [AM/FM] to select FM.




t Push [TRANSMIT] or [PTT] (microphone) to transmit.






[MIC GAIN] [AM/FM] Tuning dial

Appears




• “P.AMP





















➥ Push [A/NOTCH] to turn the auto or manual notch fi lter ON and OFF.








ON.





4

D Tone squelch operation

Tone squelch operation is a method of communications using selective calling. Only received signals having a matching tone will open the squelch. Before communicating using tone squelch, all members of your party must agree on the tone squelch frequency to use.

q Push [AM/FM] to select FM mode.


e Push [F4 TON] several times to turn the tone squelch function ON.

• “TSQL” appears r Push [F4 TONE] for 1 sec. to enter tone frequency set mode.

t Push [F1 TON] several times until TSQL Tone appears, if necessary.

y Rotate the tuning dial to select the desired tone squelch frequency.

• Push [F3] for 1 sec. to select the default frequency.

u Push [MENU] to return to M1.

i Communicate in the usual manner.

• Available tone squelch frequencies

67.0

69.3

71.9

74.4

77.0

79.7

82.5

(Unit: Hz)

0 85.4

0 88.5

0 91.5

0 94.8

0 97.4

100.0

103.5

107.2

110.9

114.8

118.8

123.0

127.3

131.8

136.5

141.3

146.2

151.4

156.7

159.8

162.2

165.5

167.9

171.3

173.8

177.3

179.9

183.5

186.2

189.9

192.8

196.6

199.5

203.5

206.5

210.7

218.1

225.7

229.1

233.6

241.8

250.3

254.1

A G C D U P C M P T O N S C P

F 1 F 2 F 3 F 4 F 5

Push [F4] for 1 sec.

T S Q L T o n e

T O N S C N 8 8 . 5 H z

F 1 F 2 F 3 F 4 F 5

42

43

4


D DTCS operation

DTCS function is an another method of communications using selective calling. Only received signals having a matching 3-digit code will open the squelch.



e Push [F4 TON] several times to turn the DTCS function ON.

• “DTCS” appears r Push [F4 TON] for 1 sec. to enter tone frequency set mode.

t Push [F1 TON] several times until DTCS Code appears, if necessary.

y Rotate the tuning dial to select the desired DTCS code number and push [F5] to select the desired code polarity.

NN : receive.

NR : polarity is used for receive.

RN : mal polarity is used for receive.

RR : and receive.

• Push [F3] for 1 sec. to select the default code and polarity.

u Push [MENU] to return to M1.

i Communicate in the usual manner.

• Available tone codes

047

051

053

054

065

071

023

025

026

031

032

036

043

125

131

132

134

143

145

072

073

074

114

115

116

122

205

212

223

225

226

243

152

155

156

162

165

172

174

263

265

266

271

274

306

244

245

246

251

252

255

261

351

356

364

365

371

411

311

315

325

331

332

343

346

452

454

455

462

464

465

412

413

423

431

432

445

446

546

565

606

612

624

627

466

503

506

516

523

526

532

723

731

732

734

743

754

631

632

654

662

664

703

712


F 1 F 2 F 3 F 4 F 5


D T C S C o d e

T O N S C N O 2 3 - N N

F 1 F 2 F 3 F 4 F 5

Select a code with the tuning dial.

Push [F5] to select the polarity


4

■ Repeater operation

A repeater amplifi es received signals and retransmits them at a different frequency. When using a repeater, the transmit frequency is shifted from the receive frequency by an offset frequency. A repeater can be accessed using split frequency operation with the shift frequency set to the repeater’s offset frequency.


w Push [A/B] to select VFO A.

e Push [AM/FM] to select FM.

• Pushing [AM/FM] toggles between AM and FM.

r Rotate the tuning dial to set the repeater transmit frequency.

t While M1 is selected, push [F2 DUP] several times to set the offset direction.

• “DUP–” or “DUP+” appears

0.600 MHz for 144 MHz band is set by default in set mode. (p. 83) y Push [F4 TON] to turn the repeater tone ON.

• “T” appears.

advance, if desired. (p. 45) 88.5 Hz is set by default.

To transmit a 1750 Hz European repeater tone, push [F4 TON] while transmitting.

u Communicate in the normal way.


F 1 F 2 F 3 F 4 F 5

Push [F2], [F4]

1 4 5 . O 8 O O O


F 1 F 2 F 5 F 3 F 4

Appears

D One-touch repeater function

This function allows you to set repeater operation with push of one switch.

➥ To set the transceiver for repeater operation using the one-touch repeater function, follow the steps q to r as above, then push [F2 DUP] for 1 sec.

Set the offset shift direction and frequency in advance (p. 82) as well as the tone frequency (see p. 45).


F 1 F 2 F 3 F 4 F 5


1 4 5 . O 8 O O O


F 1 F 2 F 5 F 3 F 4

Appears

44

45

4


D Transmit frequency monitor check

You may be able to receive the other party’s transmit signal directly without having to go through a repeater.

This function allows you to check this.

➥ While receiving, push and hold [XFC] to see if you can receive the other party’s transmit signal directly.

• While holding [XFC], the offset direction and frequency are displayed on the multi-function switch indicator.

[XFC]

- 6 O O . O k


D Repeater tone frequencies

The transceiver’s repeater tone frequency is set to

88.5 Hz by default. This can be changed if desired.

q While M1 is selected, push [F4 TON] to turn the tone encoder ON.

• “T” appears.

w Push [F4 TON] for 1 sec. to select the tone frequency set mode.

e Push [F1 TON] several times to select Rptr

Tone, if necessary.

r Rotate the tuning dial to select the desired frequency. (see the table at right) t Push [MENU] to return to M1.

R p t r T o n e

T O N S C N 8 8 . 5 H z

• Available tone frequencies

67.0

69.3

71.9

74.4

77.0

79.7

82.5

(Unit: Hz)

0 85.4

0 88.5

0 91.5

0 94.8

0 97.4

100.0

103.5

107.2

110.9

114.8

118.8

123.0

127.3

131.8

136.5

141.3

146.2

151.4

156.7

159.8

162.2

165.5

167.9

171.3

173.8

177.3

179.9

183.5

186.2

189.9

192.8

196.6

199.5

203.5

206.5

210.7

218.1

225.7

229.1

233.6

241.8

250.3

254.1

D Storing a non standard repeater

q Turn the auto repeater function OFF in the set mode. (p. 83) w Push [AM/FM] to select FM mode.

e Push [V/M], then [A/B] to select VFO A.

r Rotate the tuning dial to set the repeater output frequency.

• Set the tuning step if desired.

t Push [A/B] to select VFO B.

y Rotate the tuning dial to set the repeater input frequency.

u Push [A/B] to select VFO A.

i Push [SPLIT] to turn the split function ON.

o Push [F4 TON] to turn the previously set tone encoder ON.

!0 Rotate [M-CH] to select the desired memory channel.

• “BLANK” appears when a blank channel is selected.

!1 Push [MW] for 1 sec. to store the contents in the selected memory channel.

[V/M]

[MW]

[AM/FM] [SPLIT] [A/B] [M-CH]

FUNCTIONS FOR RECEIVE

5

■ Simple band scope

The band scope function allows you to visually check signal conditions around a specifi ed frequency. The

IC-7400’s band scope function can be used in any operating mode and frequency band.

S T E P

0 . 5 k

Sweep indicator

Band scope indicator

Frequency indicator mark

Sweep step indicator

INDICATOR

Frequency indicator mark

Sweep step

DESCRIPTION

Sweep

Band scope indicator

While the band scope is “sweeping,” “ ” appears; while stopped “ ” appears. Received audio is not emitted from the speaker while the band scope is “sweeping.”

Indicates the relative strength of signals and their location in relation to the center (displayed) frequency. Signal strength is relative to the S-meter level, S1 to S9, with each vertical dot in the band scope indicator equal to one segment of the S-meter. Signal activity is measured ±30 steps from the center frequency with each step equal to the selected sweep step.

After a sweep, indicates the relative position of the selected frequency. When the selected frequency is outside of the sweep range,

“ ” or “ ” indicator fl ashes. After changing the frequency, push [F3] for 1 sec. to automatically return to the center frequency.

Indicates the selected sweep step. 0.5, 1, 2, 5, 10, 20 and 25 kHz are selectable. Each dot of the band scope indication is approx. equal to the selected sweep step.

The band scope measures receive signal conditions over a specifi ed range on either side of a selected frequency in either VFO or memory modes.

q Rotate the tuning dial to tune a frequency.

w While M1 is selected, push [F5 SCP] to select the band scope menu.

lected sweeping step.

• During sweep, received signals cannot be heard.

e Push [F5 STEP] several times to select the desired sweep step.

r Push [F1] to start sweeping, then stop automatically after sweeping.

case, it is necessary to push [F1] to stop sweeping.

” appears and received signals cannot be heard.

the attenuator ON to reduce the signal input level and improve the readability of the band scope.

t When rotating the tuning dial and you fi nding a signal you wish to communicate on, then just communicate in the normal way.

rotating the tuning dial), push [F3] for 1 sec.

range,

“ ” or “ ”

fl ashes.

y While receiving, if you want to update the band conditions, repeat steps e and r as above.

F 1 F 2

Sweep start/stop

F 3 F 4

S T E P

O . 5 k

F 5

Sweep step selection

F 4

S T E P

O . 5 k

F 5 F 1 F 2

Sweep indicator

F 3

46

5

FUNCTIONS FOR RECEIVE

■ Preamp/Attenuator

The preamp amplifi es received signals in the front end circuit to improve the S/N ratio and sensitivity. Set this to preamp 1 or preamp 2 when receiving weak signals.

The attenuator prevents a desired signal from distortion when very strong signals are near the desired frequency or when very strong electric fi elds, such as from broadcasting stations, are near your location.

These can both set independently for each band.

➥ Push [P.AMP/ATT] several times to set the preamp

OFF, preamp 1 ON or preamp 2 ON.

•

1” or

“P.AMP

2” appears in the function display.

only be set to ON or OFF only— there is no preamp 1 and preamp 2.

Regular preamp, the most effective for 1.8 to

21 MHz bands without IMD corruption.

High-gain preamp, the most effective for 24 to 50 MHz bands.

Preamp activates for the VHF band

(144 to

146 MHz range; 108 to 174 for the USA version)

.


[P.AMP/ATT]

Push

P.AMP/ATT

Push

P.AMP/ATT

Push

P.AMP/ATT

Push

P.AMP/ATT

Push for 1sec.

P.AMP/ATT

Regarding the use of the “P.AMP

2

”

The “P.AMP

2” is a high gain receive amplifi er. When the

“P.AMP

2” is used during times of strong electric fi elds, distortion sometimes results. In such cases, use the transceiver with the “P.AMP 1” or “P.AMP OFF” setting.

The “P.AMP

2” is most effective when:

• Used on bands above 24 MHz and when electric fi elds are weak.

• Receive sensitivity is insuffi cient during low gain, or while using a narrow band antenna

(such as small loop, a Beverage antenna or a short Yagi antenna, etc.)

is used.

■ RIT function

The RIT (Receive Increment Tuning) function compensates for off-frequencies of the communicating station.

The function shifts the receive frequency up to

±9.99 kHz in 10 Hz steps without moving the transmit frequency.

• See

#0 on p. 4 for function description.

q Push [RIT] to turn the RIT function ON and OFF.

tion is ON.

w Rotate the [RIT/

∂TX] control.

47 when the quick RIT clear function is ON. (p. 86) operating frequency.

D RIT monitor function

When the RIT function is ON, pushing and holding

[XFC] allows you to monitor the operating frequency directly (RIT is temporarily cancelled).

Appears

[CLEAR]

[RIT] [RIT/

∂TX] control


5

■ AGC function

The AGC (auto gain control) controls receiver gain to produce a constant audio output level even when the received signal strength is varied by fading, etc.

The transceiver has 3 AGC characteristics (time constant; fast, mid, slow) for non-FM modes.

The FM mode AGC time constant is fi xed as ‘FAST’

(0.1 sec.) and AGC time constant cannot be selected.

D AGC speed selection

q Select a non-FM mode.

w While M1 is selected, push [F1 AGC] several times to select AGC


“AGC OFF” appears when AGC time constant OFF is set with one of FAST, MID or SLOW setting in

AGC set mode.

D Setting the AGC time constant

q Select the desired mode other than FM mode.

w While M1 is selected, push [F1 AGC] for 1 sec. to enter AGC set mode.

e Push one of [F2

FAST

], [F3

MID

] or [F4

SLOW

] to select the desired AGC speed to be set.

r Rotate the tuning dial to set the desired time constant.

(depends on mode) or turned OFF.

•

FAST

], [F3

MID

] or [F4

SLOW

] for 1 sec. to select a default value each for fast, mid. and slow, respectively.

t Select another mode other than FM. Repeat steps e and r if desired.

y Push [MENU] to exit the AGC set mode.

Mode Default Selectable AGC time constant

(FAST)

OFF, 0.1, 0.2, 0.3, 0.5, 0.8, 1.2, 1.6

SSB 2.0 (MID)

2.0, 2.5, 3.0, 4.0, 5.0, 6.0

(FAST)

OFF, 0.1, 0.2, 0.3, 0.5, 0.8, 1.2, 1.6

2.0, 2.5, 3.0, 4.0, 5.0, 6.0

(FAST)

OFF, 0.1, 0.2, 0.3, 0.5, 0.8, 1.2, 1.6

RTTY 0.5 (MID)

2.0, 2.5, 3.0, 4.0, 5.0, 6.0

(FAST)

OFF, 0.3, 0.5, 0.8, 1.2, 1.6, 2.0, 2.5

3.0, 4.0, 5.0, 6.0, 7.0, 8.0

[F1 AGC] Mode switches

: Medium AGC speed

: Slow AGC speed

: Fast AGC speed

: AGC is not activated


F 1

F 2 F 3 F 4 F 5


F 1 F 2 F 3 F 4 F 5

Appears under the selected AGC speed’s time constant indication.

Selected mode

• When AGC fast is selected

F 1 F 2 F 3 F 4 F 5

Push [F2] for 1 sec. to select the default value in this case.

48

5


49

■ IF fi lter selection

The transceiver has 3 passband width IF fi lters for each mode.

For SSB and CW modes, the passband width can be set within 50 to 3600 Hz in 50 or 100 Hz steps. A total of 41 passband widths are available.

For RTTY mode, the passband width can be set within

50 to 2700 Hz in 50 or 100 Hz steps. A total of 32 passband widths are available.

For AM and FM modes, the passband width is fi xed and 3 passband widths are available independently.

The fi lter selection is automatically memorized in each mode.

The PBT shift frequencies are automatically memorized in each fi lter.

[FILTER]

D IF fi lter selection

q Select the desired mode.

w For RTTY mode, turn OFF the RTTY fi lter.

e Push [FILTER] several times to select the IF fi lter

1, 2 or 3.

played in the LCD.

By pushing [PBTC], the set fi lter passband width,

“

B,” and shifting value “S” is indicated.


The selected filter width is indicated for approx. 1 sec. when [FILTER] is pushed.

Filter selection

D Filter passband width setting

(SSB, CW and RTTY mode only)

q Select SSB, CW or RTTY mode.


cannot be set.

w For RTTY mode, turn OFF the RTTY fi lter.

e Push [FILTER] for 1 sec. to enter fi lter set mode.

r Push [FILTER] several times to select the desired

IF fi lter number.

t While pushing [F1 BW], rotate the tuning dial to set the desired passband width.

B W


• Indication while setting

within the following range.

50 to 500 Hz 50 Hz steps


B W the following range.



• Push [F-3] for 1 sec. to select the default value.

y Repeat steps r to t if desired.

u Push [MENU] to exit the fi lter set mode.

The PBT shift frequencies are cleared when the passband width is changed.

This fi lter set mode screen graphically displays the

PBT shift frequencies and CW pitch operations.

Reverses Appears

While pushing [F1 BW], rotate the tuning dial to set passband width.


5

■ IF (DSP) fi lter shape

The type of IF (DSP) fi lter shape for SSB and CW can be selected independently from soft and sharp.

q Push [SSB] or [CW/RTTY] to select SSB, CW or

RTTY mode.

w Select the fi lter set mode.

• Push [FILTER] for 1 sec.

• Operating mode can be selected in this step.

e Push [FILTER] several times to select the desired

IF fi lter.

r Push the [F5] to select the fi lter shape from “

SOFT

” and “

SHARP

.” t Push [MENU] to exit the set mode.

B W

B W

Push [F5]

■ Noise blanker

The noise blanker eliminates pulse-type noise such as from car ignitions. The noise blanker is not available for FM mode.

q Push [NB] to turn the noise blanker ON.

• [NB] indicator appears.

w Push [NB] for 1 sec. to enter the NB level set mode.

e Rotate the tuning dial to adjust the noise blanker level.

• Noise blanker level is indicated with bar meter and digit in ‘%.’ r Push [NB] to exit the noise blanker set mode.

t Push [NB] to turn the noise blanker OFF.

• [NB] indicator disappears.

When using the noise blanker, received signals may be distorted if the noise blanker level setting has been too high.

■ Meter peak hold function

The S-meter has a peak level holding function. The peak level of the received signal strength is indicated for 0.5 sec. (approx.). This function can be deactivated in set mode if desired. (p. 81)

[NB]

“NB” appears while noise blanker is activated.

N B L e v e l

Shows noise blanker level

5 O %

9

M e t e r P e a k H o l d

O N

Shows peak level for approx. 0.5 sec.

50

5


■ Twin PBT operation

General PBT (Passband Tuning) function electronically narrows the IF passband width by shifting the IF frequency to slightly outside of the IF fi lter passband to reject interference. This transceiver uses the DSP circuit for the PBT function. Moving both [TWIN PBT] controls to the same position shifts the IF.

➥ The LCD shows the passband width and shift frequency graphically.

➥ Push [FILTER] for 1 sec. to enter the fi lter set mode.

Current passband width and shift frequency is displayed in the fi lter set mode screen.

➥ To set the [TWIN PBT] controls to the center positions, push [PBTC] for 1 sec.

The variable range depends on the passband width and mode. The edge of the variable range is half of the passband width, and PBT is adjustable in 25 or 50 Hz steps. These controls function as an IF shift control while in AM mode and when the RTTY fi lter is turned

ON. Only the inner control may function in this case. IF shift is adjustable in 20/40 Hz steps in RTTY (RTTY fi lter is turned ON) or 150/300/500 Hz steps in AM.

• [TWIN PBT] should normally be set to the center positions

(PBT setting is cleared) when there is no interference.

NOTE: In the “center” PBT position on CW, it is normal for the graphic display’s center line to be slightly to the left side of PBT envelope, if a CW fi lter selection of

800 Hz or above is selected.

• When PBT is used, the audio tone may be changed.

• Not available for FM mode.

• For AM and RTTY (with RTTY filter ON) modes,

[TWIN PBT] inner control only can be activated, and functions as an IF shift function.

• While rotating [TWIN PBT], noise may occur. This comes from the DSP unit and does not indicate an equipment malfunction.

• By pushing [PBTC] momentarily indicates the passband width, “

B,” and shifting value, “S” of the fi lter being used.

[TWIN PBT] control

[PBTC]


Passband width and shifting value are indicated while [TWIN PBT] is operated.

Appears when PBT is used.


B W


• Indication while PBT setting

B W

Appears when passband is shifted.

*By pushing [PBTC] for 1 sec., the shifted value returns

to the default setting, and the “dot” disappears.

PBT OPERATION EXAMPLE

Center

Passband

Passband

IF shift

51 pass band

IF center frequency interference desired signal inteference desired signal IF center freq.

interference


5

■ Noise reduction

The noise reduction function reduces noise components and picks out desired signals which are buried in noise. The received signals are converted to digital signals and then the desired signals are separated from the noise.

q Push the [NR] switch to turn the noise reduction

ON.

• “NR” appears.

w Rotate the [NR] control to adjust the noise reduction level.

e Push the [NR] switch to turn the noise reduction

OFF.

• “NR” disappears.

Deep rotation of the [NR] control results in audio signal masking or distortion. Set the [NR] control for maximum readability.

■ Notch function

This transceiver has auto and manual notch functions.

The auto notch function automatically attenuates more than 3 beat tones, tuning signals, etc., even if they are moving. The manual notch can be set to attenuate a frequency via the [NOTCH] control.

➥ Push [A/NOTCH] to toggle the notch function between auto, manual and OFF in SSB and AM modes.

➥ Push [A/NOTCH] to turn the manual notch function

ON and OFF in CW mode.

➥ Push [A/NOTCH] to turn the auto notch function

ON and OFF in FM mode.

[NOTCH] control.

• “NOTCH” appears when manual notch is in use.

While operating the manual notch, noise may be heard. This comes from the DSP unit and does not indicate an equipment malfunction.

■ Dial lock function

The dial lock function prevents accidental changes caused by the tuning dial.

➥ Push [LOCK/SPCH] to turn the dial lock function

ON and OFF.

tivated.

[NR] [NR]


Appears

[

A/NOTCH] [NOTCH]


Notch function indicators

Lights while the dial lock function is activated.

[LOCK/SPCH]

52

53

5


■ Voice squelch control function

This function is useful when you don’t want unmodulated signals. When the voice squelch control function is activated, the receiver checks received signals for voice components.

If a receiver signal includes voice components, and the tone of the voice components changes within 1 sec., squelch opens. If the received signal includes no voice components or the tone of the voice components does not change within 1 sec., squelch closes.

➥ While M2 is selected with [MENU], push [F5 VSC] to switch the VSC (Voice Squelch Control) function

ON and OFF.

• “VSC” appears when the function is activated.

• The VSC function activates for phone modes

(SSB, AM and FM).

• The VSC function can also be used for scanning operation in AM or FM mode (p. 69).

VSC indicator

S C N M E M S W R T C N V S C

F 1 F 2 F 3 F 4 F 5

Push [F5] to turn the VSC function ON and OFF.

FUNCTIONS FOR TRANSMIT

6

■ VOX function

The VOX (Voice-Operated Transmission) function switches between transmit and receive with your voice.

This function provides an opportunity to input log entries into your computer, etc., while operating.

• Using the VOX function

q Select a phone mode (SSB, AM, FM).

w Push [VOX/BK-IN] to turn the VOX function ON or

OFF.

[VOX/BK-IN]


Appears

D Adjusting the VOX function

q Select a phone mode (SSB, AM, FM).

w Push [VOX/BK-IN] to turn VOX function ON.

e Push [VOX/BK-IN] for 1 sec. to enter VOX set mode.

r Select the VOX Gain item using [F1 ≤] or [F2 ≥]. t While speaking into the microphone, rotate the tuning dial to the point where the transceiver is continuously transmitting.

- Push [F3] for 1 sec. to select the default value. y Push [F2 ≥] to select Anti-VOX item. u While receiving, rotate the tuning dial to the point where the transceiver does not switch to transmit with the speaker output.

- Push [F3] for 1 sec. to select the default value. i Push [F2 ≥] to select VOX Delay item. o Adjust the VOX delay for a convenient interval before returning to receive.

- Select the VOX delay item using the tuning dial.

- Push [F3] to select the default value.

!0 Push [MENU] to return to previous indication.

V O X G a i n

1

F 1 F 2

Shows VOX gain level

F 3 F 4

5 O %

F 5

A n t i - V O X

2

F 1 F 2 F 3

Shows anti-VOX gain level

F 4

5 O %

F 5

V O X D e l a y

3

F 4

O . 2 s

F 5 F 1 F 2

Shows VOX delay time

F 3

54

55

6

FUNCTIONS FOR TRANSMIT

■ Break-in function

The break-in function is used in CW mode to automatically toggle the transceiver between transmit and receive when keying. The IC-7400 is capable for full break-in or semi break-in.

[VOX/BK-IN]

D Semi break-in operation

During semi break-in operation, the transceiver selects transmit when keying, then automatically returns to receive after a pre-set time from when you stop keying.

q Push [CW/RTTY] to select CW or CW-R mode.

w Push [VOX/BK-IN] several times to turn the semi break-in function ON.

• “BK-IN” appears.

e Set the break-in delay time (the delay from transmit to receive).

➥ Push [VOX/BK-IN] for 1 sec. to select break-in delay program mode.

➥ Rotate the tuning dial to select the desired delay.

• Push [F3] for 1 sec. to select to the default value.

r Push [MENU] to return to the previous menu.

When using a paddle, rotate [KEY SPEED] to adjust the keying speed.

D Full break-in operation

During full break-in operation, the transceiver automatically selects transmit while keying and returns to receive immediately after keying is fi nished.

q Push [CW/RTTY] to select CW or CW-R mode.

w Push [VOX/BK-IN] several times to turn the full break-in function ON.

• “

FBK-IN” appears.

When using a paddle, rotate [KEY SPEED] to adjust the keying speed.

B r e a k - I N D e l a y

7 . 5 d

Break-in indicator

Shows break-in delay time

A G C D U P 1 / 4 K E Y S C P

Full break-in indicator

■ ∂TX function

The

∂TX function shifts the transmit frequency up to

±9.99 kHz in 10 Hz steps without moving the receive frequency.

• See

#2 on p. 4 for function description.

q Push the [

∂TX] switch to turn the ∂TX function

ON and OFF.

ON.

w Rotate the [RIT/

∂TX] control.

• To reset the

∂TX frequency, push [CLEAR] for 1 sec.

•

∂TX frequency when the quick RIT clear function is ON. (p. 85)

•

∂TX frequency to the displayed frequency, push [

∂TX] for 1 sec.

When RIT and

∂TX are ON at the same time, the

[RIT/

∂TX] control shifts both the transmit and receive frequencies from the displayed frequency at the same time.

D ∂TX monitor function

When the

∂TX function is ON, pushing and holding

[XFC] allows you to monitor the operating frequency directly (

∂TX is temporarily cancelled).

■ Monitor function

The monitor function allows you to monitor your transmit IF signals in any mode through the speaker. Use this to check voice characteristics while adjusting SSB transmit tones. (p. 88) The CW sidetone functions regardless of the [MONITOR] switch setting.

q Push [MONITOR] to switch the monitor function

ON and OFF.

• “MONI” appears when the monitor function is ON.

w Set the monitor level.

➥ Push [MONITOR] for 1 sec. to select monitor program mode.

➥ Rotate the tuning dial for the clearest audio output while pushing [PTT] and speaking into the microphone.

• Push [F3] for 1 sec. to select the default value.

e Push [MENU] to return to the previous menu.


6

Appears

[CLEAR]

[

∂TX]

[RIT/

∂TX] control

[MONITOR]

M O N I T O R L e v e l

5 O %

Monitor indicator

Shows monitor level

56

6


■ Speech compressor

The speech compressor increases average RF output power, improving signal strength and readability in

SSB, AM or FM.

When adjusting the compression level, it is necessary to turn the COMP meter ON in the set mode, in advance (p. 81).

• In SSB mode

q Select USB or LSB mode and adjust [MIC GAIN] to a suitable level.

w While M1 is selected, push [F3 CMP] to turn the speech compressor ON.

• “COMP” appears.

e Push [F3 CMP] for 1 sec. to select compression level set mode.

r While speaking into the microphone, rotate the tuning dial, so that the COMP meter reads within the

COMP zone with your normal voice level.


When the COMP meter peaks above the COMP zone, your transmitted voice may be distorted.

t Push [MENU] to return to M1.

• In AM/FM mode

q While M1 is selected, push [F3 CMP] to turn the speech compressor ON.

• “COMP” appears.

w Push [F3 CMP] for 1 sec. and set the compression level as “1” in advance.

e While speaking into the microphone, rotate [MIC

GAIN], so that the COMP meter does not exceed the center dot whether you speak softly or loudly.

r While speaking into the microphone, rotate the tuning dial, so that the COMP meter reads within the

COMP zone with your normal voice level.


When the COMP meter peaks above the COMP zone, your transmitted voice may be distorted.

t Push [MENU] to return to M1.

C O M P L e v e l

Compressor indicator

Shows compression level

ALC meter

COMP meter

COMP level zone

*The SWR meter functions as the COMP meter

when COMP meter is set to ON in the set mode.

C O M P L e v e l

5

1

Adjust [MIC GAIN], so that the COMP meter does not exceed this zone.

Adjust the COMP Level with the tuning dial so that the COMP meter does not exceed the COMP level zone.

57

■ Transmit fi lter width selection

(SSB mode only)

The transmit fi lter width for SSB mode can be selected from wide, middle and narrow.

A G C D U P C M P T B W S C P q Select USB or LSB mode.

w Push [MENU] to select M1, if necessary.

e Push [F4 TBW] for 1 sec. to select the transmission passband width.

F 1 F 2 F 3

Push [F4]

F 4 F 5

BW=NAR” is displayed for approx. 1 sec.

• Transmit fi lter width: NAR 2.2

T X B W = W I D E


F 1 F 2 F 3 F 4 F 5

The selected transmit filter width is displayed for approx. 1 sec.

Push [F4] for 1 sec. to select the transmit filter width.


6

■ Split frequency operation

Split frequency operation allows you to transmit and receive in the same mode on two different frequencies. The split frequency operation is basically performed using 2 frequencies in VFO A and VFO B.

The following is an example of setting 21.290 MHz for receiving and 21.310 MHz for transmitting.

q Set 21.290 MHz (USB) in VFO A.

w Push [SPLIT] to turn the split function ON, then push [A/B] for 1 sec.

appear on the LCD, and the [SPLIT] indicator lights.

e While pushing [XFC] rotate the tuning dial to set the transmit frequency to 21.310 MHz.

[XFC].

r Now you can receive on 21.290 MHz and transmit on 21.310 MHz.

To change the transmit and receive frequencies, push

[A/B] to exchange the VFO A and VFO B.

[SPLIT] Lights during split operation

[XFC] Tuning dial [A/B]

2 1 . 2 9 O O O


Shows transmit (VFO B) frequency Appears

• While pushing [XFC]

CONVENIENT

• Direct shift frequency input

The shift frequency can be entered directly.

q Push [F-INP].

w Enter the desired shift frequency with the digit keys.

• 1 kHz to 1 MHz can be set.

[GENE • ] in advance.

e Push [SPLIT].

split function is turned ON.

[Example]

To transmit on 1 kHz higher frequency:

- Push [F-INP], [1.8 1] then [SPLIT].

To transmit on 3 kHz lower frequency:

- Push [F-INP], [GENE • ], [7 3] then [SPLIT].

• Split lock function

Accidentally releasing the [XFC] switch while rotating the tuning dial changes the receive frequency.

To prevent this, use both the split lock and dial lock functions to change the transmit frequency only. The split lock function cancels the dial lock function while pushing [XFC] during split frequency operation.

The dial lock’s effectiveness during split frequency operation can be selected in the set mode for both receive and transmit frequencies; or only the receive frequency. (p. 82)

+ 2 O . O O k


Shows shift frequency and direction

Shows transmit (VFO B) frequency

• After setting up

2 1 . 3 1 O O O


58

59

6


■ Quick split function

When you push the [SPLIT] switch for 1 sec., split frequency operation is turned ON, the undisplayed VFO is automatically changed according to the plus/minus shift frequency programmed in set mode (p. 83) or equalized when 0 kHz (default value) is programmed as the split shift frequency. Quick split operation is turned ON by default but can be turned OFF in set mode (p. 82).

q Suppose you are operating at 21.290 MHz (USB) in

VFO A.

w Push [SPLIT] for 1 sec.

• Split frequency operation is turned ON.

e While pushing [XFC], rotate the tuning dial to set the frequency offset between transmit and receive.

cated.

D Split offset frequency setting

By setting an often-used split frequency offset in advance, you can use the quick split function to select split operation at the push of one switch.

Set the split offset frequency in advance in set mode

(p. 82, item 12). The example at right shows the split offset is set to +0.020 MHz.

➥ Push [SPLIT] for 1 sec. to activate the quick split function.

quency according to the offset in set mode.

• Setting the frequency while pushing [XFC]

+ 2 O . O O k


Shows shift frequency and direction

S P L I T O f f s e t

1 2

+ O . O 2 O M H z

2 1 . 3 1 O O O


Shows transmit frequency for split operation

D Split lock function

The split lock function is convenient for changing only the transmit frequency. When the split lock function is not used, accidentally releasing [XFC] while rotating the tuning dial, changes the receive frequency. The split lock function is ON by default, but can be turned OFF in set mode.

q While split frequency operation is ON, push [LOCK/

SPCH] to activate the split lock function.

w While pushing [XFC], rotate the tuning dial to change the transmit frequency.

ing dial, the receive frequency does NOT change.

S P L I T L O C K

1 3 O F F

[XFC] Tuning dial [LOCK/SPCH]


6

■ Measuring SWR

The IC-7400 has a built-in circuit for measuring antenna SWR— no external equipment or special adjustments are necessary.

The IC-7400 can measure SWR in 2 ways— spot measurement and plot measurement are available.

D Spot measurement

q Push [TUNER] to turn the antenna tuner OFF.

w Turn the COMP meter OFF.

➥ Push [MENU] for 1 sec. to enter set mode.

➥ Push [F1 ≤] or [F2 ≥] several times to select the

COMP Meter item.

➥ Rotate the tuning dial to set the COMP meter OFF.

➥ Push [MENU] to exit set mode.

e Push [CW/RTTY] several times to select RTTY mode.

r Push [TRANSMIT] or [PTT] on the microphone.

t Rotate [RF PWR] clockwise past the 12 o’clock position for more than 30 W output power (30%).

y Read the SWR on the SWR meter.

u Push [TRANSMIT] or release [PTT] to receive.

The built-in antenna tuner matches the transmitter to the antenna when the SWR is lower than 3:1.

D Plot measurement

Plot measurement allows you to measure the SWR over an entire band.

q While M2 is selected with [MENU], push [F3 SWR].

• SWR graph screen appears.

w Rotate [RF PWR] clockwise past the 12 o’clock position for more than 30 W output power (30%).

e Set the center frequency for the SWR to be measured.

r Push [F5] for 1 sec. several times to select the desired measuring step from 10, 50, 100 and

500 kHz.

t Push [F3] several times to select the desired number of measuring steps from 3, 5, 7, 9, 11 and 13 steps.

y Push [F1] to start the measuring.

u Push [TRANSMIT] or push and hold [PTT] on the microphone to measure the SWR.

• Frequency marker, “

∫,” appears below SWR graph.

• RTTY mode is automatically selected.

i When pushing [TRANSMIT] again or releasing

[PTT], the frequency marker and frequency indication move to the next frequency to be measured.

o Repeat steps u and i to measure SWR over the entire frequency range.

!0 When the measured SWR is less than 1.5:1, the antenna is well matched with the transceiver in the measured frequency range.


The best match is in this range.


F 1 F 2 F 5 F 3 F 4

Push [F3]

S T E P

1 O k

F 1 F 2 F 3 F 4 F 5

Push [F1] to start measuring.

Push [F5] to select

SWR measuring step.

Push [F3] to select number of SWR measuring steps.

• Measuring

(after pushing [F1])

S T E P

1 O k

Frequency marker appears and moves after measurement.

*When mesurement point/s is/are set outside of the operatable frequency band, the frequency marker flashes.

— 4.0:1

— 3.0:1

— 2.0:1

— 1.5:1

— 1.0:1

Typical display SWR varying between 1 and 2, full scale up to SWR 4.0:1.

60

61

7

MEMORY OPERATION

■ Memory channels

The transceiver has 101 memory channels (plus 1 call channel). The memory mode is very useful for quickly changing to often-used frequencies.

All 101 memory channels are tuneable which means the programmed frequency can be tuned temporarily with the tuning dial, etc. in memory mode.

MEMORY

MEMORY

CHANNEL

CHANNEL

NUMBER

CAPABILITY

1–99

Regular memory

channels

Scan edge

memory

channels

Call channel

P1, P2

C

One frequency and one mode in each memory channel.

One frequency and one mode in each memory channel as scan edges for programmed scan.

Same as regular.

TRANSFER

TO VFO

OVER-

WRITING

CLEAR

Yes Yes Yes

Yes

No

Yes

Yes

No

No

■ Memory channel selection

D In VFO mode

q Push [V/M] to select VFO mode, if necessary, then rotate [M-CH] to select a memory channel number.

selected.

grammed into a memory channel.

w Push [V/M] to select memory mode.

• “MEMO” and contents of the memory channel appear.

D In memory mode

q Push [V/M] to select memory mode.

w Rotate [M-CH] to select a memory channel.

selected.

phone [UP]/[DN] keys.

• During VFO mode

[V/M] [M-CH]

Disappears when a channel is programmed.

• During memory mode

MEMORY OPERATION

7

■ Programming a memory

Memory channel programming can be preformed either in VFO mode or in memory mode.

D Programming in VFO mode

q Set the desired frequency and operating mode in

VFO mode.

w Rotate [M-CH] to select the desired memory channel.

blank channel (and does not have contents).

e Push [MW] for 1 sec. to program the displayed frequency and operating mode into the memory channel.

cessful.

D Programming in VFO mode

q Select the desired memory channel with [M-CH] in memory mode.

• Memory channel contents appear in the display.

played if the selected memory channel is a blank channel (and does not have contents).

w Set the desired frequency and operating mode in memory mode.

with the keypad or memo pads, etc.

e Push [MW] for 1 sec. to program the displayed frequency and operating mode into the memory channel.

cessful.

[MW]

[V/M] [M-CH]

• [EXAMPLE]: Programming 7.088 MHz/LSB

into memory channel 12.


• [EXAMPLE]: Programming 21.280 MHz/USB

into memory channel 18.


■ Memory clearing

Any unnecessary memory channels can be cleared.

The cleared memory channels become blank channels.

q Select memory mode with [V/M].

w Select the desired memory channel with [M-CH].

e Push [M-CL] for 1 sec. to clear the contents.

pear.

ful.

r To clear other memory channels, repeat steps w and e.

[M-CL]

[V/M] [M-CH]

62

7

MEMORY OPERATION

■ Selecting the call channel

By default 145.00000 MHz/FM is programmed into the call channel. However, this can be changed to suit your operating preference. (see below) q Push [CALL] to select the call channel.

• “C” appears.

w Push [CALL] again to return to the previous mode.

[CALL]

63

■ Programming the call channel

The call channel is programmed in the same way regular memory channels are. It’s convenient to program a most-often-used frequency into the call channel for quick recall. As with memory channels, the call channel can also hold split frequencies.

q Rotate [M-CH] to select the call channel.

• “C” appears.

w Select the desired frequency and operating mode to program into the call channel.

e Push [MW] for 1 sec. to program the displayed frequency and operating mode into the call channel.

cessful.

IMPORTANT!: When the call channel is selected with the [CALL] switch, the frequency CANNOT be changed using the tuning dial, band keys or keypad input. However, when the call channel is selected using [M-CH] in memory mode, the frequency CAN be changed.


“C” appears

[MW]

[V/M] [M-CH]


MEMORY OPERATION

7

■ Frequency transferring

The contents of a memory channel (frequency, operating mode, etc.) can be transferred to the VFO.

Frequency transferring can be performed in either

VFO mode or memory mode.

D Transferring in VFO mode

This is useful for transferring programmed contents to

VFO.

q Select VFO mode with [V/M].

w Select the memory channel to be transferred with

[M-CH].

blank channel. In this case transferring is impossible.

e Push [V/M] for 1 sec. to transfer the frequency and operating mode.

• 3 beeps are emitted.

[V/M] [M-CH]

TRANSFERRING EXAMPLE IN VFO MODE

Operating frequency : 21.320 MHz/USB (VFO)

Contents of M-ch 16 : 14.018 MHz/CW

Push [V/M] for 1 sec.

D Transferring in memory mode

This is useful for transferring frequency and operating mode while operating in memory mode.

When you have changed the frequency or operating mode in the selected memory channel:

• Displayed frequency and mode are transferred.

• Programmed frequency and mode in the memory channel are not transferred, and they remain in the memory channel.

q Select the memory channel to be transferred with

[M-CH] in memory mode.

• And, set the frequency or operating mode if required.

w Push [V/M] for 1 sec. to transfer the frequency and operating mode.

ferred to the VFO.

e To return to VFO mode, push [V/M] momentarily.

TRANSFERRING EXAMPLE IN MEMORY MODE

Operating frequency : 14.020 MHz/CW (M-ch 16)

Contents of M-ch 16 : 14.018 MHz/CW

Set the frequency

Push [V/M] for 1 sec.

then push [V/M]

64

65

7

MEMORY OPERATION

■ Programming scan edges

Memory channels P1 and P2 are the program scan edges. They are used to program an upper and lower frequency for programmed scan (p. 70). By default,

P1 is programmed with 0.50000 MHz and P2 is programmed with 29.99999 MHz. If P1 and P2 are programmed with the same frequencies, programmed scan will not proceed.

[EXAMPLE]: Programming 14.00000 MHz into P1 and

14.35000 MHz into P2.

q Push [V/M] to select VFO mode, if necessary.

w Rotate [M-CH] to select scan edge P1.

e Rotate the tuning dial to set 14.00000 MHz as the lower frequency.

r Push [MW] for 1 sec. to program 14.00000 MHz into scan edge P1.


t Rotate [M-CH] to select scan edge P2.

y Rotate the tuning dial to set 14.35000 MHz as the upper frequency.

u Push [MW] for 1 sec. to program 14.35000 MHz into scan edge P2.


will search the frequencies between 14.00000 MHz and

14.35000 MHz for signals.

• After steps w to r

• After steps t to u

[V/M] [MW]

Tuning dial [M-CH]

MEMORY OPERATION

7

■ Assigning memory names

All memory channels (including scan edges) can be tagged with alphanumeric names of up to 9 characters each.

[EXAMPLE]: Programming “DX spot” into memory channel 99.

q Push [V/M] to select memory mode, if necessary.

w Rotate [M-CH] to select memory channel 99.

e Push [MENU] several times to select M2.

r Push [F2 MEM] to select the memory name screen.

t Push [F1 EDT] to edit memory channel name.

• A cursor appears and blinks.

edited.

y Push [F1] several times to select the type of characters for input.

” ’ ` ^ + –

✱ / . , : ; = < > ( ) [ ] { } | _ – are available.

cluding a decimal point.

u Rotate the tuning dial to select the fi rst character for input.

i Push [F2 ç] or [F3 å] to move the cursor forwards or backwards, respectively. the selected character. o Repeat steps w to i to program another memory channel’s name, if desired.

!0 Push [MENU] to set the memory channel name and return to the memory name menu.

• Push [MENU] 1 more times to return to M2.

[MENU]

[V/M]

Tuning dial [M-CH]


F 1 F 2 F 3 F 4 F 5

Push [F2 MEM]

1 4 . 1 9 5 O O U S B

E D T ( ) S E L

F 4 F 5 F 1 F 2

Push [F2 MEM]

F 3

A B C D E L S P C

F 1

F 2 F 3 F 4 F 5

• During assigning a memory name

D X

A B C D E L S P C

F 1 F 2 F 3 F 4 F 5

Input space

Delete a character

Move cursor forwards

Move cursor backwards

Selects character type

• After assigning a memory name

D X s p o t a b c D E L S P C

F 1 F 2 F 3 F 4 F 5

66

7

MEMORY OPERATION

■ Memo pads

The transceiver has a memo pad function to store frequency and operating mode for easy write and recall.

The memo pads are separate from memory channels.

The default number of memo pads is 5, however, this can be increased to 10 in set mode if desired. (p. 84)

D Writing frequencies and operating

modes into memo pads

➥ Push [MP-W] to store the displayed frequency and operating mode into a memo pad.

the next available memo pad; when you write a 6th (or

11th) frequency and operating mode, the oldest written frequency and operating mode are automatically erased to make room for the new settings.

• Displayed frequency and mode

MP-W

NOTE: Each memo pad must have its own unique combination of frequency and operating mode; memo pads having identical settings cannot be written.

• Stored in next available memo pad


In this example, pushing [MP-W] enters 21.28000 MHz

USB into the top memo pad and erases the oldest memo pad (21.34724 MHz LSB).

D Recalling a memo pad

➥ Push [MP-R] to recall a memo pad.

• Each push of [MP-R] recalls a memo pad, starting from the most recently written.

• VFO or memory mode

MP-R

• Memo pads

Erased

67


MP-R

SCANS

8

■ Scan types

PROGRAMMED SCAN

Repeatedly scans between two scan edge frequencies

(scan edge memory channels P1 and P2).

Scan edge

P1 or P2

Scan edge

P2 or P1

Scan

Jump

This scan operates in VFO mode.

MEMORY SCAN

Repeatedly scans all programmed memory channels.

Mch 2

SEL

Mch 3 Mch 4

Mch 1

SEL

SEL Mch 5

Mch 99

SEL

Mch 7

SEL

This scan operates in memory mode.

Mch 6

∂F SCAN

Repeatedly scans within

∂F span area.

–

∂F frequency

Scan

Start frequency

+

∂F frequency

Scan

Jump

This scan operates in both VFO and memory modes.

SELECT MEMORY SCAN

Repeatedly scans all selected memory channels.

Mch 2

SEL

Mch 3 Mch 4

Mch 1

SEL

SEL Mch 5

Mch 99

SEL

Mch 7

SEL

This scan operates in memory mode.

Mch 6

■ Preparation

• Channels

For programmed scan:

Program scan edge frequencies into scan edge memory channels P1 and P2.

For

∂F scan:

Set the

∂F span (∂F scan range) in the scan screen.

For memory scan:

Program 2 or more memory channels except scan edge memory channels.

For select memory scan:

Designate 2 or more memory channels as select memory channels. To designate the channel as a select memory channel, choose a memory channel, then push [F3 SEL] in the scan screen, or push [F5 SEL] in the memory name screen.

• Scan resume ON/OFF

You can select the scan to resume or cancel when detecting a signal, in set mode. Scan resume ON/OFF must be set before operating a scan. See p. 70 for

ON/OFF setting and scan resume condition details.

• Scan speed

Scan speed can be selected from 2 levels, high or low, in set mode. See p. 69 for details.

• Squelch condition

SCAN

STARTS

WITH

SCAN

SQUELCH

OPEN

The scan continues until it is stopped manually, and does not pause even if it detects signals.

Scan pauses on each channel when the scan resume is

ON; not applicable when OFF.

Scan stops when detecting a signal.

SQUELCH

CLOSED

If you set scan resume ON in scan set mode, the scan pauses for 10 sec. when detecting a signal, then resumes. When a signal disappears while scan is paused, scan resumes 2 sec. later.

68

69

8

SCANS

■ Voice squelch control function

This function is useful when you don’t want unmodulated signals pausing or cancelling a scan. When the voice squelch control function is activated, the receiver checks received signals for voice components.

If a receiver signal includes voice components, and the tone of the voice components changes within 1 sec., scan pauses (or stops). If the received signal includes no voice components or the tone of the voice components does not change within 1 sec., scan resumes.

➥ While M2 is selected with [MENU], push [F5 VSC] to switch the VSC (Voice Squelch Control) function

ON and OFF.

• “VSC” appears when the function is activated.

• The VSC function activates for any scan.

• The VSC function resumes the scan on unmodulated signals, regardless of whether the scan resume condition is set to ON or OFF.

■ Scan set mode

When the squelch is open, scan continues until it is stopped manually— it does not pause on detected signals. When squelch is closed, scan stops when detecting a signal, then resumes according to the scan resume condition. Scan speed and the scan resume condition can be set using the scan set mode.

q Push [MENU] to select M2.

w Push [F1 SCN] to select scan menu.

e Push [F5 SET] to select scan set mode.

r Push [F1 ≤] or [F2 ≥] to select SCAN Speed item.

t Rotate the tuning dial to select scan speed from high and low.

y Push [F2 ≥] to select SCAN Resume item.

u Rotate the tuning dial to select scan resume function from ON and OFF.

10 sec., then resumes. When a signal disappears, scan resumes 2 sec. later.

i Push [MENU] to return to scan menu.

VSC indicator


F 1 F 2 F 3 F 4 F 5

Push [F5] to turn the VSC function ON and OFF.


F 1 F 2 F 3 F 4 F 5

Push [F1]

∂ F : ± 1 O k

P R O

∂

F F I N S P N S E T

F 1

F 1

F 2 F 3 F 4

Push [F5]

F 5

S C A N S p e e d

1

H I G H

F 4 F 5 F 2 F 3

Push [F1] or [F2]

F 1

S C A N R e s u m e

2 O N

F 2 F 3 F 4 F 5

SCANS

8

■ Programmed scan/Fine programmed scan (VFO mode)

Programmed scan searches for signals between scan edge memory channels P1 and P2. The default frequencies for these memories are 0.500000 MHz and

29.99999 MHz, respectively. See p. 65 for scan edges programming.

[TS] q Push [V/M] to select VFO mode, if necessary.

w Select the desired operating mode.

[V/M] ning.

e Push [TS] to select a tuning step.

• The tuning step can also be changed while scanning.

r Push [MENU] to select M2.

t Push [F1 SCN] to select the scan menu.

• See p. 68 for scan condition.

[MENU]

Mode keys

Tuning dial

S C N M E M S W R T C N V S C squelch is always open in SSB, CW and RTTY modes.

y Push [F1 PRO] to start the programmed scan.

• The MHz and kHz decimal points blink while scanning.

u When the scan detects a signal, the scan stops, pauses or ignores it depending on the resume, VSC setting and the squelch condition.

i To cancel the scan, push [F1 PRO].

operation.

If the same frequencies are programmed into the scan edge memory channel P1 and P2, programmed scan does not start.

F 1 F 2

Push [F1]

F 3 F 4 F 5

∂ F : ± 1 O k

P R O

∂

F F I N S P N S E T

F 1 F 2

Push [F1]

F 3 F 4 F 5

P R O G S C A N

P R O

∂

F F I N S P N S E T

F 1 F 2 F 3 F 4 F 5

Push [F1] to start/cancel the scanning.

D About the Fine programmed scan

During programmed scan, when a signal is received, scan continues, but the tuning step is temporarily set to 10 Hz.

q Follow steps q to y above to start programmed scan.

w During programmed scan, push [F3 FIN] to switch between programmed scan and fi ne programmed scan operation.

e Push [F1 PRO] to cancel the scan.

operation.

P R O G S C A N

P R O

∂

F F I N S P N S E T

F 1 F 2 F 3 F 4 F 5

Push [F3] to switch between programmed scan and fine programmed scan.

F - P R O G S C A N

P R O

∂

F F I N S P N S E T

F 1 F 2 F 3 F 4 F 5

70

8

SCANS

71

■ Memory scan operation (Memory mode)

Memory scan searches through memory channel 1 to

99 for signals. Blank (unprogrammed) memory channels are skipped.

q Push [V/M] to select memory mode, if necessary.


e Push [F1 SCN] to select the scan menu.


[MENU] squelch is always open in SSB, CW and RTTY modes.

r Push [F1 MEM] to start the memory scan.

• The MHz and kHz decimal points blink while scanning.

memory scan to proceed.

t To cancel the scan, push [F1 MEM].

operation.

Tuning dial [V/M]

M E M O S C A N

M E M

∂

F S E L S P N S E T

F 1

F 2 F 3 F 4 F 5


■ Select memory scan

Select memory scan searches through memory channels set as “select,” for signals. See below for setting and deleting select memory channels.

q Follow the steps q to r above to start memory scan.

w During memory scan, push [F3 SEL] to switch between memory scan and select memory scan.

channel.

e Push [F1 MEM] to cancel the scan.

operation.

M E M O S C A N

M E M

∂

F S E L S P N S E T

F 1 F 2 F 3 F 4 F 5

Push [F3] to switch between memory scan and select memory scan.

S E L - M E M O S C A N

M E M

∂

F S E L S P N S E T

F 1 F 2 F 3 F 4 F 5

D Setting/Cancelling select memory channels

All memory channels, except scan edges (P1 and P2), can be set as a select memory channels.

➥ While the scan menu is selected, push [F3 SEL] to set/cancel the displayed memory channel as a select channel; or while memory name screen is indicated, push [F5 SEL] to set/cancel the displayed memory channel as a select memory channel.

memory channel.

• “SEL” disappears when cancelled.

memory settings.

• Scan menu

M E M ∂ F S E L S P N S E T

F 1 F 2 F 3

∂

F : ± 1 O k

F 4 F 5

Push [F3] to set/cancel as a select channel.

Select memory inidcator

• Memory name screen

1 4 . 1 9 5 O O U S B

E D T ( ) S E L

F 1 F 2 F 3 F 4 F 5

Push [F3] to set/cancel as a select channel.

SCANS

8

■ ∂F scan operation and Fine ∂F scan

∂F scan searches for signals within the specified range with the displayed VFO or memory channel frequency as for center frequency. The frequency range is specifi ed by the span.

q Push [V/M] to select VFO mode or memory mode, as desired.

w Set center frequency of the

∂F scan.

e Push [MENU] to select M2.

r Push [F1 SCN] to select the scan menu.


squelch is always open in SSB, CW and RTTY modes.

t Set the

∂F span by pushing [F4 SPN].

±500 kHz and ±1 MHz are selectable.

y Push [F2 ∂F] to start the

∂F scan.

• Decimal points blink while scanning.

u When the scan detects a signal, the scan stops, pauses or ignores it depending on the VSC, resume setting and the squelch condition.

i Push [F2 ∂F] to cancel the

∂F scan.

operation.

[MENU]

F 1

Push [F2]

F 2 F 3

Keypad [V/M]

Tuning dial


F 1

F 2

Push [F1]

F 3 F 4 F 5

∂

F : ± 1 O k

P R O

∂

F F I N S P N S E T

F 4 F 5

Push [F4] to select the span.

D About the Fine ∂F scan

During

∂F scan, when a signal is received, scan continues, but the tuning step is temporarily set to 10 Hz.

q Follow steps q to y above to start programmed scan.

w During

∂F scan, push [F3 FIN] to switch between

∂F scan and fi ne ∂F scan operation.

e Push [F2 ∂F] to cancel the scan.

operation.

∂

F S C A N

P R O ∂ F F I N S P N S E T

F 1 F 2 F 3 F 4 F 5


∂

F S C A N


F 1 F 2 F 3 F 4 F 5

Push [F3] to switch between programmed scan and fine programmed scan.

F -

∂

F S C A N


F 2 F 3 F 4 F 5

F 1

72

73

8

SCANS

■ Tone scan/DTCS code scan operation

By monitoring a signal that is being operated with a repeater, tone squelch or DTCS, you can determine the tone frequency necessary to open a repeater or the squelch.


F 1 F 2 F 3 F 4 F 5



e Push [F4 TONE] for 1 sec. to enter tone set mode.

r Push [F1 TON] to select the tone type to be scanned.


R p t r T o n e

T O N S C N 8 8 . 5 H z

F 1 F 2 F 3 F 4 F 5

tone squelch and “DTCS Code” for DTCS code can be selected.

Push [F1] several times to select tone type.

several times to select the DTCS code polarity.

“NN” : Normal polarity for both transmit and receive.

“NR” : Normal polarity for transmit and reverse polarity for receive.

“RN” : Reverse polarity for transmit and normal polarity for receive.

“RR” : Reverse polarity for both transmit and receive.

t Push [F2 SCN] to start the tone scan function.

• Repeater tone scan

R p t r T o n e S C A N

T O N S C N 8 8 . 5 H z

F 1 F 2 F 3 F 4 F 5

Push [F2] to start/cancel the scan.

“DTCS Code SCAN” blinks when repeater tone scan, tone squelch scan or DTCS code scan is operated, respectively.

y When a matched tone or code is found, the scan pauses and the tone frequency or code is set for the selected tone as in step r.

When the tone scan or DTCS code scan is operated in memory or call channel mode, the detected tone frequency or code can be used temporarily.

To keep the detected tone frequency or code setting for memory contents, you must over-write the memory or call channel.

u Push [F2 SCN] to cancel the tone scan function.

• Tone squelch tone scan

T S Q L T o n e S C A N

T O N S C N 8 8 . 5 H z

F 1 F 2 F 3


F 4 F 5

• DTCS code scan

D T C S C o d e S C A N

T O N S C N O 2 3 - N N operation.

F 1 F 2 F 3 F 4 F 5


Push [F1] several times to select polarity.

ANTENNA TUNER OPERATION

■ Antenna connection and selection

The IC-7400 has 2 antenna connectors for the HF/

50 MHz bands, [ANT1] and [ANT2], and 1 antenna connector for the 144 MHz band; a total of 3 antenna connectors.

For each operating band the IC-7400 covers, there is a band memory which can memorize a selected antenna. When you change the operating frequency beyond a band, the previously used antenna is automatically selected (see below) for the new band. This function is convenient when you use 2 antennas for

HF and 50 MHz bands operation.

• Antenna select function: “Auto”

Once an antenna has been selected for use with a band by pushing [ANT], the antenna is automatically selected whenever that band is accessed.

[EXAMPLE]: a 3.5/7 MHz antenna is connected to

[ANT1], a 21/28/50 MHz antenna is connected to

[ANT2]. When the antenna selector function is set to “Auto,” an antenna is automatically selected when changing bands.

[ANT]

144 MHz 21/28/50 MHz 3.5/7 MHz

[ANT2] [ANT1]

9

• Antenna select function: “Manual”

When “Manual” is selected, you can use the [ANT1] and [ANT2], however, band memory does not function. In this case you must select an antenna manually. However, the 144 MHz antenna will still be selected automatically.

[EXAMPLE]: an optional antenna tuner and HF antenna are connected to [ANT1] and a 50 MHz antenna is connected to [ANT2].

• Antenna select function: “OFF”

In this case, only [ANT1] and the 144 MHz antenna connector can be used. [ANT] switch does not function.

144 MHz band 50 MHz band HF bands

[ANT2]

AH-4

[ANT1]

74

9

ANTENNA TUNER OPERATION

■ Antenna tuner operation

The internal automatic antenna tuner matches the transceiver to the connected antenna automatically.

Once the tuner matches an antenna, the variable capacitor angles are memorized as a preset point for each frequency range (100 kHz steps). Therefore, when you change the frequency range, the variable capacitors are automatically preset to the memorized point.

CAUTION:

NEVER transmit with the tuner ON when no antenna is connected. This will damage the transceiver. Be careful of the antenna selection.

D TUNER OPERATION

➥ Push [TUNER] to turn the internal antenna tuner

ON. The antenna is tuned automatically when the antenna SWR is higher than 1.5:1.

• When the tuner is ON, the “TUNE” indicator appears.

75

• MANUAL TUNING

During SSB operation at low voice levels, the internal tuner may not be tuned correctly. In such cases, manual tuning is helpful.

➥ Push [TUNER] for 1 sec., to start manual tuning.

• A side tone is emitted and “TUNE” indicator blinks while tuning.

• If the tuner cannot reduce the SWR to less than 1.5:1 after 20 sec. of tuning, the [TUNER] switch indicator goes out.

• AUTOMATIC TUNER START (HF bands only)

If you want to deactivate the tuner under conditions of

VSWR 1.5:1 or less, use the auto tuner start function and turn the tuner OFF. This function activates the tuner automatically when the SWR exceeds 1.5:1.

This function is turned ON in set mode. (p. 83).

• PTT TUNER START

The tuner is always tuned when the PTT is pushed after the frequency is changed (more than 1% from last-tuned frequency). This function removes the

“push and hold [TUNER]” operation and activates for the fi rst transmission on a new frequency.

This function is turned ON in set mode. (p. 83).

• Antenna tuner of the IC-PW1/EURO

When using an external antenna tuner such as the

IC-PW1/EURO’s tuner, tune with the external antenna tuner, while the internal tuner is turned OFF.

After tuning is completed, turn the internal tuner ON.

Otherwise, both tuners tune simultaneously and correct tuning may not be obtained.

See the instruction manual included with each antenna tuner for their respective operations.

[TUNER]

NOTES:

• The internal antenna tuner can only tune the HF and

50 MHz bands— the 144 MHz band cannot be tuned.

• NEVER transmit without an antenna properly connected to antenna port in use.

• When 2 antennas are connected, select the antenna to be used with [ANT].

• If the SWR is higher than about 1.5:1 when tuning above

100 kHz on an antenna’s preset point, push [TUNER] for

1 sec. to start manual tuning.

• The internal tuner may not be able to tune in AM mode. In such cases, push [TUNER] for 1 sec. to manually tune.

D If the tuner cannot tune the antenna

Check the following and try again:

• the [ANT] connector selection.

• the antenna connection and feedline.

• the unaltered antenna SWR.

(Less than 3:1 for HF bands;

Less than 2.5:1 for 50 MHz band)

• the transmit power.

(8 W for HF bands; 15 W for 50 MHz band)

• the power source voltage/capacity.

If the tuner cannot reduce the SWR to less than 1.5:1 after checking the above, perform the following:

• repeat manual tuning several times.

• tune with a 50

Ω dummy load and re-tune the antenna.

• turn power OFF and ON.

• adjust the antenna cable length.

(This is effective for higher frequencies in some cases.)

• Some antennas, especially for low bands, have a narrow bandwidth. These antennas may not be tuned at the edge of their bandwidth, therefore, tune such an antenna as follows:

[Example]: Suppose you have an antenna which has an

SWR of 1.5:1 at 3.55 MHz and an SWR of 3:1 at 3.8 MHz.

q Push [TUNER] to turn the antenna tuner ON.

w Select CW mode.

e Turn OFF the break-in function. (p. 55) r Push [TRANSMIT] to set to the transmit condition.

t Set 3.55 MHz and key down.

y Set 3.80 MHz and key down.

u Push [TRANSMIT] to return to the receive condition.

ANTENNA TUNER OPERATION

9

■ Optional external tuner operation

D AH-4 HF/50 MHz AUTOMATIC ANTENNA TUNER

The AH-4 matches the IC-7400 to a long wire antenna

AH-4 setting example:

more than 7 m/23 ft long (3.5 MHz and above).

• See the AH-4 instruction manual for AH-4 installation and antenna connection details.

For mobile operation

NEVER operate the AH-4 without an antenna wire.

The tuner and transceiver will be damaged.

NEVER operate the AH-4 when it is not grounded.

Transmitting before tuning may damage the transceiver. Note that the AH-4 cannot tune when using a

1

⁄

2

 long wire or multiple of the operating frequency.

For outdoor operation

Long wire

When connecting the AH-4, the antenna connector assignments are [ANT2] for the internal tuner and

[ANT1] for the AH-4. The antenna indicator in the

LCD displays “EXT” when the AH-4 is connected and selected.

Optional AH-2b antenna element

R WARNING: HIGH VOLTAGE!

NEVER

touch the antenna element while tuning or transmitting.

D

AH-4 operation

Tuning is required for each frequency. Be sure to re-tune the antenna before transmitting when you change the frequency— even slightly.

q Set the desired frequency in an HF or 50 MHz band.

ham bands.

w Push [TUNER] for 1 sec.

• “TUNER” blinks while tuning.

e “TUNE” appears constantly when tuning is complete.

indicator goes out, and the AH-4 is bypassed. At that point the antenna wire connection root is to the transceiver directly, and not via AH-4 antenna tuner.

r To bypass the AH-4 manually, push [TUNER].

[TUNER]

• Connecting the AH-4

Coaxial cable (from AH-4)

Long wire or optional AH-2b

ANT1

Transceiver

Ground

AH-4

Control cable

76

77

10

DATA COMMUNICATION

■ Connections

■ When connecting to [DATA]

• When using a PC application

q DATA IN w GND r DATA OUT (9600 bps) y P SQL* t AF OUT (1200 bps) e PTT P

TX AUDIO

GND

RX AUDIO

SQL

PTT

Connect to serial port, parallel port, speaker jack, microphone jack and line IN/OUT jack, etc.

See the instruction manual of the application for details.

PC

• When using a TNC

q DATA IN w GND r DATA OUT (9600 bps) y P SQL* t AF OUT (1200 bps) e PTT P

TX AUDIO

GND

RX AUDIO

SQL

PTT

TNC

RS-232C

*When connecting the squelch line, consult the necessary manual (TNC, etc.)

■ When connecting to [ACC(1)]


RTTY

RTTY OUTPUT

GND

1

4

6

2

8

5

3

7

GND

AF

SEND

AUDIO INPUT

PTT



PC

RTTY OUTPUT

GND

AUDIO INPUT

PTT

TNC or scan converter


RTTY

GND

1

4

6

2

8

5

3

7

AF

SEND

Rear panel view

RS-232C

■ When connecting to [MIC]


MIC INPUT

AF OUTPUT

MIC GND

GND

AUDIO OUTPUT

AF INPUT

GND



PTT*


MIC INPUT

AF OUTPUT

MIC GND

GND

PTT*

AFSK OUTPUT

AF INPUT

GND

TNC or scan converter

RS-232C

PTT*

SQL

PTT*

SQL INPUT

PC

*When using the VOX function, no need to connect. Refer to the instruction

manual of the external equipment (TNC, etc.).

When connecting the squelch line, consult the necessary manual (TNC, etc.).

DATA COMMUNICATION

10

■ Packet (AFSK) operation

Before operating packet (AFSK) be sure to consult the operating manual that came with your TNC.

q Connect a TNC and PC. (p. 77) w Push a band key to select an operating band.

e Push [SSB] or [AM/FM] to select the desired operating mode.

select LSB data or USB data mode, or after AM or FM is selected, push [AM/FM] for 1 sec. to select AM data or FM data mode.

packet operation on the VHF band.

r Rotate the tuning dial to tune the desired signal.

t Transmit your AFSK signals using your computer’s keyboard.

• Rotate [RF PWR] to set the output power.

the Po meter while operating the TNC.

power so that the ALC reading in the ALC meter stays in the ALC zone.

NOTE: When connecting a TNC to the ACC socket on the rear panel, select SSB (LSB/USB) data mode or disconnect the microphone and rotate [MIC

GAIN] fully counterclockwise.

When SSB data mode is selected, the audio input from the [MIC] connector is automatically cut, and the audio input from the [ACC(1)] is used.

Also, when the SSB data mode is selected, the fi xed setting listed below are selected automatically;

• Speech compressor : OFF

• Transmit bandwidth : MID

• Tx tone (Bass) : 0

• Tx tone (Treble) : 0


[MIC GAIN] [SSB] [AM/FM] Tuning dial

Selected mode indicator appears

D

Frequency indication during AFSK operation

When operating AFSK in SSB mode, the indicated frequency is the signals carrier point.

• Example— LSB/LSB data mode

Mark freq.: 2125 Hz

Shift freq.: 200 Hz

2325 Hz

200 Hz 2125 Hz

Carrier point

(Displayed frequency)

78

79

10

DATA COMMUNICATION

■ Adjusting the TNC output level

When setting data transmission speed to 9600 bps, the data signal coming from the TNC is applied exclusively to the internal limiter circuitry to automatically maintain band width.

NEVER apply data levels from the TNC of over 0.6 V p-p, otherwise the transceiver will not be able to maintain the band width and may possibly interfere with other stations.

D

Using with a level meter or synchroscope

When using a level meter or synchroscope, adjust the

TX audio output level (DATA IN level) from the TNC as follows.

0.4 V p-p

(0.2 Vrms)

: recommended level

0.2–0.5 V p-p

(0.1–0.25 Vrms)

: acceptable level

D

Not using a measuring device

q Connect the transceiver to a TNC. (p. 77) w Enter a test mode (“CAL,” etc.) on the TNC, then transmit some test data.

e When the transceiver fails to transmit the test data

or transmits sporadically (TX indicator doesn’t light or fl ashes):

indicator lights continuously.

When transmission is not successful even though

the TX indicator lights continuously:

- Increase the TNC output level.

■ Data transmission speed

For data communication (in FM mode), the transceiver can be set to a maximum data speeds of 9600 bps (or less; 1200, 2400 or 4800 bps).

q Push [MENU] for 1 sec. to enter set mode.

w Push [F1 ≤] or [F2 ≥] to select the 9600bps

Mode item.

e Rotate the tuning dial to turn the 9600 bps mode

ON and OFF.

ON : 9600 bps of data speed

OFF : 1200, 2400 or 4800 bps of data speed

(default) r Push [MENU] to return to previous indication.

9 6 O O b p s M o d e

2 1 O F F

Select with the tuning dial


2 1 O N

SET MODE

11

■ General set mode

D Entering set mode

Set mode is used for programming infrequently changed values or conditions of functions.

• Set mode operation

q Push [MENU] several times to select the function menu indication, if necessary.

w Push [MENU] for 1 sec. to enter the set mode.

e Push [F1 ≤] or [F2 ≥] to select the desired item.


t Push [MENU] to exit the set mode.

[F1 ≤] [F2 ≥]

[MENU] Tuning dial

D Set mode items

1. LCD Contrast

This item adjusts the contrast of the LCD from 0% to

100% in 1% steps.

(default: 50%)

2. LCD Backlight

This item adjusts the brightness of the LCD from 0% to 100% in 1% steps.

(default: 50%)

3. Beep Level

This item adjusts the volume level for confi rmation beep tones from 0% to 100% in 1% steps. When the beep tones, item 6. Beep (p. 81), are turned OFF, this setting has no effect.

(default: 50%)

4. Beep Level-lmt

This item allows you to set a maximum volume level for confi rmation beep tones. Confi rmation beep tones are linked to the [AF] control until a specifi ed volume level is reached— further rotation of the [AF] control will not increase the volume of the beep tones.

ON Confi rmation beep ON (default)

OFF Confi rmation beep OFF

5. CAL. Marker

This item is used for a simple frequency check of the transceiver.

ON Calibration marker ON

OFF Calibration marker OFF (default)

See p. 93 for calibration procedure.

1

L C D C o n t r a s t

5 O %

L C D B a c k l i g h t

2 5 O %

B e e p L e v e l

3 5 O %

4

B e e p L e v e l - l m t

O N

C a l . M a r k e r

5 O F F

Turn the calibration marker OFF after checking the frequency of the transceiver.

80

81

11

SET MODE

■ General set mode (continued)

6. Beep

A beep sounds each time a switch is pushed to confi rm it. This function can be turned OFF for silent operation.

ON Confi rmation beep ON (default)

OFF Confi rmation beep OFF

The volume level can be set in 3. Beep Level.

(p. 80)

7. Band Edge Beep

A beep sounds when an operating frequency enters or exits an amateur band. This functions independent of the confi rmation beep setting (above).

ON Band edge beep ON (default)

OFF Band edge beep OFF

The volume level can be set in 3. Beep Level.

(p. 80)

8. RF/SQL Control

The [RF/SQL] control can be set as the RF/squelch control (default), the squelch control only (RF gain is fi xed at maximum) or ‘Auto’ (RF gain control in SSB,

CW and RTTY; squelch control in AM and FM).

RF+SQL [RF/SQL] control as RF/squelch control (default)

SQL [RF/SQL] control as squelch control

AUTO [RF/SQL] control as RF gain control in SSB, CW and RTTY; squelch control in AM and FM

9. Meter Peak Hold

This item turns the meter peak hold function ON and

OFF. When set to ON (default), peak meter readings are displayed for about 0.5 sec.

10. COMP Meter

This item turns the COMP meter indication ON and

OFF during transmit. When set to ON, the COMP meter is displayed instead of the SWR meter.

(default: OFF)

6

B e e p

O N

B a n d E d g e B e e p

7 O N

8

R F / S Q L C o n t r o l

R F + S Q L

9

M e t e r P e a k H o l d

O N

C O M P M e t e r

1 O O F F

SET MODE

11


11. Quick SPLIT

When this item is set to ON, pushing [SPLIT] for 1 sec. sets the transmit frequency using the displayed frequency and the split offset, set in SPLIT Offset item below, and activates the split function automatically.

ON Quick split ON (default)

OFF Quick split OFF

12. SPLIT Offset

This item sets the offset (difference between transmit and receive frequencies) for the quick split function.

The offset frequency can be set from –9.999 MHz to

+9.999 MHz in 1 kHz steps.

13. SPLIT LOCK

When this item is ON, the tuning dial can be used to adjust the transmit frequency while pushing [XFC] even while the dial lock function is activated.

ON Split lock function ON

OFF Split lock function OFF (default)

14. DUP Offset HF

This item sets the offset (difference between transmit and receive frequencies) for duplex operation. However, this setting is used to input the repeater offset for an HF band only.

The offset frequency can be set from 0.000 MHz to

9.999 MHz in 1 kHz steps.

15. DUP Offset 50M

This item sets the offset (difference between transmit and receive frequencies) for duplex operation. However, this setting is used to input the repeater offset for a 50 MHz band only.



16. DUP Offset 144M

This item sets the offset (difference between transmit and receive frequencies) for duplex operation. However, this setting is used to input the repeater offset for a 144 MHz band only.



Q u i c k S P L I T

1 1 O N

S P L I T O f f s e t

1 2 O . O O O M H z

S P L I T L O C K

1 3 O F F

D U P O f f s e t H F

1 4 O . 1 O O M H z

D U P O f f s e t 5 O M

1 5 O . 5 O O M H z

D U P O f f s e t 1 4 4 M

1 6 O . 6 O O M H z

82

83

11

SET MODE


17. One Touch Rptr

This item turns the one touch repeater function ON

(DUP- or DUP+) and OFF.

When [F2 DUP] is pushed for 1 sec. in M1, the selected offset direction and the programmed duplex offset frequency (depending on the operating frequency band) is set with the displayed frequency.

19. Auto Tune

The internal antenna tuner has an automatic start capability which starts tuning if the SWR is higher than

1.5–3:1 in the HF bands.

When “OFF” is selected, the tuner remains OFF even when the SWR is poor (1.5–3:1). When “ON” is selected, automatic tune starts even when the tuner is turned OFF.

20. PTT Tune

Tuning of the internal or external antenna tuner can be started automatically at the moment the PTT is pushed after the operating frequency is changed

(more than 1% from the last-tuned frequency).

21. 96OObps Mode

This item turn the 9600 bps data transmission capability ON and OFF.

ON : For 9600 bps data transmission.

OFF : transmission only.

22. [ANT] Switch

You can set the antenna connector selection to automatic, manual or non-selection (when using 1 antenna only for the HF/50 MHz bands).

Auto : The antenna switch is activated and the band memory memorizes the selected antenna. (default)

Manual : The antenna switch is activated and selects an antenna manually.

OFF

: The antenna switch is not activated and does not function. The [ANT1] connector is always selected in this case.

O n e T o u c h R p t r

1 7 D U P -

A u t o T u n e

1 9 O F F

P T T T u n e

2 O O F F


2 1 O F F

[ A N T ] S w i t c h

2 2 A u t o

SET MODE

11


23. SPEECH Language

When the optional UT-102


is installed, you can select between English and Japanese as the language.

English : Announces in English (default)

Japanese : Announces in Japanese

See p. 89 for unit installation.

24. SPEECH Speed


VOICE SYNTHESIZER UNIT is installed, you can select between faster or slower synthesizer output.

HIGH : Announces faster (default)

LOW : Announces slower


25. SPEECH S-Level



is installed, you can have frequency, mode and signal level announcement. Signal level announcement can be deactivated if desired.

ON : Announces operating frequency, mode and receiving signal level. (default)

OFF : mode only.


26. Memory Pad Ch

This item sets the number of memo pad channels available. 5 or 10 memo pads can be set.

5 : 5 memo pads (default)

10 : 10 memo pads

S P E E C H L a n g u a g e

2 3 E n g l i s h

S P E E C H S p e e d

2 4 H I G H

S P E E C H S - L e v e l

2 5 O N

M e m o r y P a d C h

2 6 5

84

85

11

SET MODE


27. DIAL Auto TS

This item sets the auto tuning step function. When rotating the tuning dial rapidly, the tuning step automatically changes several times as selected.

There are 2 type of auto tuning steps: HIGH (Fastest) and LOW (Faster).

HIGH Auto tuning step is turned ON.

Approx. 5 times fastest tuning step during rapid rotation (default)

Auto tuning step is turned ON.

Approx. 2 times faster tuning step during rapid rotation

OFF : Auto tuning step is turned OFF.

28. MIC U/D Speed

This item sets the rate at which frequencies are scanned when the microphone [UP]/[DN] switches are pushed and held. High or low can be selected.

HIGH High speed (default, 50 tuning steps/ sec.)

LOW : Low speed (25 tuning steps/sec.)

29. Quick RIT Clear

This item selects the RIT/

∂TX frequency clearing instruction with [PBTC].

ON : Clears the RIT/

∂TX frequency when

[PBTC] is pushed momentarily.

OFF

∂TX frequency when

[PBTC] is pushed for 1 sec. (default)

30. BW Popup (PBT)

This item turns the PBT shifting value indication ON and OFF during [TWIN PBT] control operation. When set to ON, the shifting value is displayed above the multi-function switches.

(default: ON)

31. BW Popup (FIL)

This item turns the IF fi lter width indication ON and

OFF when selecting with [FILTER]. When set to ON, the fi lter width is displayed above the multi function switches.

(default: ON)

D I A L A u t o T S

2 7 H I G H

M I C U / D S p e e d

2 8 H I G H

Q u i c k R I T C l e a r

2 9 O F F

B W P o p u p ( P B T )

3 O O N

B W P o p u p ( F I L )

3 1 O N

SET MODE

11


32. SSB/CW Synchronous Tuning

This item selects the displayed frequency shift function from ON and OFF.

When this function is activated, the receiving signal can be kept in receive even when the operating mode is changed between SSB and CW.

ON : The displayed frequency shifts when the operating mode is changed between SSB and CW.

The displayed frequency does not shift.

(default)

The frequency shifting value may differ according to the CW pitch setting.

33. CW Normal Side

Selects the carrier point of CW mode from LSB and

USB.

The carrier point is set to LSB side.

(default)

USB : The carrier point is set to USB side.

34. KEYER 1st Menu

This item selects the appearing menu when [F4 KEY] is pushed in M1 at fi rst, from KEYER-Root and

KEYER-SEND.

KEYER-Root : Selects memory keyer menu fi rst (default)

KEYER-SEND : fi rst

35. External Keypad

This item sets the external keypad capability.

OFF External keypad does not function. (default)

KEYER SEND : Pushing one of external keypad switches, transmits the desired keyer memory contents during

CW mode operation.

For your information

The diagram as at right shows the equivalent circuit of an external keypad and connects to pin 3 and pin 7 of the [MIC] connector (p. 12)

S S B / C W S y n c T u n

3 2 O F F

C W N o r m a l S i d e

3 3 L S B

K E Y E R 1 s t M e n u

3 4 K E Y E R - R o o t

E x t e r n a l K e y p a d

3 5 O F F

4.7k

Ω

±5%

2.2k

Ω

±5%

1.5k

Ω

±5%

1.5k

Ω

±5%

To [MIC] connector pin e

S4

(T4/M4)

S3

(T3/M3)

S2

(T2/M2)

S1

(T1/M1)

To [MIC] connector pin u

USER EXTERNAL KEYPAD

86

87

11

SET MODE


36. CI-V Baud Rate

This item sets the data transfer rate. 300, 1200, 4800,

9600, 19200 bps and “Auto” are available.

Auto : Auto baud rate (default)

3OO : 300 bps

12OO : 1200 bps

48OO : 4800 bps

96OO : 9600 bps

192OO : 19200 bps

When “Auto” is selected, the baud rate is automatically set according to the connected controller or remote controller.

37. CI-V Address

To distinguish equipment, each CI-V transceiver has its own Icom standard address in hexadecimal code.

The IC-7400’s address is 66h.

When 2 or more IC-7400’s are connected to an optional CT-17

CI

-

V LEVEL CONVERTER

, rotate the tuning dial to select a different address for each IC-7400 in the range 01h to 7Fh.

38. CI-V Transceive

Transceive operation is possible with the IC-7400 connected to other Icom HF transceivers or receivers.

ON : Transceive ON (default)

OFF : Transceive OFF

When “ON” is selected, changing the frequency, operating mode, etc. on the IC-7400 automatically changes those of connected transceivers (or receivers) and vice versa.

39. CI-V 731 Mode

When connecting the IC-7400 to the IC-735 for transceive operation, you must change the operating frequency data length to 4 bytes.

• This item must be set to “ON” only when operating the transceiver with the IC-735.

ON : 4 bytes of frequency data

OFF : 5 bytes of frequency data (default)

C I - V B a u d R a t e

3 6 A u t o

C I - V A d d r e s s

3 7 6 6 h

C I - V T r a n s c e i v e

3 8 O N

C I - V 7 3 1 M o d e

3 9 O F F

SET MODE

11

■ Tone control set mode

D Entering tone control set mode

Tone levels (bass and treble) for each transmit and receive audio can be set for each phone mode independently.

• Set mode operation

q Push [MENU] several times to select M2.

w Push [F4 TCN] to select the tone control set mode.

e Push [F1 ≤] or [F2 ≥] to select the desired item.

r Push [SSB] or [AM/FM] to select the desired operating mode.

t Set the desired condition using the tuning dial.

• Push [F3] for 1 sec. to select a default value.

y Push [MENU] to exit the set mode.

D Tone control set mode items

1. TX Bass

This item adjusts the bass level of the transmit audio tone from –5 dB to +5 dB in 1 dB steps.

2. TX Treble

This item adjusts the treble level of the transmit audio tone from –5 dB to +5 dB in 1 dB steps.

3. RX Bass

This item adjusts the bass level of the receive audio tone from –5 dB to +5 dB in 1 dB steps.

4. RX Treble

This item adjusts the treble level of the receive audio tone from –5 dB to +5 dB in 1 dB steps.

[F1 ≤] [F2 ≥] [F4 TCN]

[MENU] Tuning dial

1

T X B a s s S S B

O

2

T X T r e b l e S S B

O

3

R X B a s s S S B

O

4

R X T r e b l e S S B

O

88

12

OPTION INSTALLATION

■ Opening the transceiver’s case

Follow the case and cover opening procedures shown here when you want to install an optional unit or adjust the internal units, etc.

CAUTION:

DISCONNECT the DC power cable from the transceiver before performing any work on the transceiver. Otherwise, there is danger of electric shock and/or equipment damage.

q Remove the 2 screws from the left side of the transceiver to remove the carrying handle as shown at right.

w Remove the 6 screws from the top of the transceiver and the 6 screws from the sides, then lift up the top cover.

e Turn the transceiver upside down.

r Remove 6 screws from the bottom of the transceiver, then lift up the bottom cover.

89

■ UT-102

VOICE SYNTHESIZER UNIT

The UT-102 announces the accessed readout’s frequency, mode, etc. (S-meter level can also be announced— p. 84) in a clear, electronically-generated voice, in English (or Japanese).

➥ Push [LOCK/SPCH] for 1 sec. to announce the frequency, etc.

q Remove the top and bottom covers as shown above.

w Remove the protective paper attached to the bottom of the UT-102 to expose the adhesive strip.

e Plug UT-102 into J1920 on the MAIN unit as shown in the diagram at right.

r Adjust the trimmer, SPCH LVL: R1925 on the MAIN unit, to set the speech level if desired. Refer to the illustration at right.

t Return the top and bottom covers to their original positions.

R1925

J1920

MAIN unit

UT-102

OPTION INSTALLATION

12

■ CR-338

HIGH STABILITY CRYSTAL UNIT

By installing the CR-338, the total frequency stability of the transceiver will be improved.

q Remove the bottom cover as shown on the previous page.

w Remove the 4 screws from the shield cover of the

RF unit, and disconnect P2 (CHASSIS) from J761

(MAIN), then lift up the shield cover.

TUNER

(antenna tuner) connector

Shield cover

P2

(CHASSIS)

RF unit

J761

(MAIN unit) e Remove the 8 screws from the RF unit, disconnect

J1, J121 and J151, then remove the RF unit.

r Remove the supplied internal crystal and replace with the CR-338.

t Return the RF unit, J1, J121 and J151 to their original positions.

Black belt

Blue belt

J151

Blue

J1

Black

J121

Red

CR-338

Supplied crystal

Red belt

RF unit

Soldering points y Connect a frequency counter to the J262, 2LO

IN, then adjust the reference frequency to be

64.00000 MHz with the L1901 on the RF unit.

u Return the J262, shield cover, P2 and bottom covers to their original positions.

Connect a frequency counter, then adjust the frequency to be 64.00000 MHz.

RF unit

J262

2LO IN

L1901

90

13

MAINTENANCE

91

■ Troubleshooting

The following chart is designed to help you correct problems which are not equipment malfunctions.

If you are unable to locate the cause of a problem or solve it through the use of this chart, contact your nearest Icom Dealer or Service Center.

PROBLEM

Power does not come on • Power cable is improperly connected.

when the [POWER] switch is pushed.

• Fuse is blown.

SOLUTION REF.

• Re-connect the DC power cable correctly.

• Check for the cause, then replace the fuse with p. 16 p. 92 the spare one.

( Fuses are installed in the DC power cable and the internal PA unit.)

No sounds come out from the speaker.

Sensitivity is too low, and only strong signals are audible.

• Volume level is too low.

• The squelch is closed.

• The transceiver is in transmitting condition.

• The antenna is not connected properly.

• The antenna for another band is selected.

• The antenna is not properly tuned.

• Rotate [AF] clockwise to obtain a suitable listening level.

• Turn [RF/SQL] to 10 o’clock position to open the squelch.

p. 23 p. 24

• Push [TRANSMIT] to receive or check the p. 25

SEND line of an external unit, if desired.

• Re-connect to the antenna connector.

• Select an antenna suitable for the operating frequency.

• Push [TUNER] for 1 sec. to manually tune the antenna.

• Push [P.AMP/ATT] for 1 sec. to select “ATT OFF.”

— p. 74 pgs. 75, p. 47

76

• The attenuator is activated.

Received audio is unclear or distorted.

• Wrong operating mode is selected.

• PBT function is activated.

• Noise blanker is turned ON when receiving a strong signal.

• Preamp is activated.

• Select a suitable operating mode.

• Push [PBTC] for 1 sec. to reset the function

• Push [NB] to turn the noise blanker OFF.

p. 23 p. 51 p. 50

• The noise reduction is activated and the [NR] control is too far clockwise.

• Push [P.AMP/ATT] once or twice to turn the p. 47 function OFF.

• Set the [NR] control for maximum readability.

p. 52

The [ANT] switch does not function

Transmitting is impossible.

• The antenna switch has not been activated.

• The operating frequency is not set to a ham band.

• Set the antenna switch in set mode to “Auto” or “Manual.” p. 84

• Set the frequency to a ham band.

p. 19

Output power is too low.

• [RF PWR] is set too far counterclockwise

• [MIC GAIN] is set too far counterclockwise

• The antenna for another band is selected.

• The antenna is not properly tuned.

• Rotate [RF PWR] clockwise.

• Set [MIC GAIN] to a suitable position.

• Select an antenna suitable for the operating frequency.

p. 25 p. 25 p. 74

• Push [TUNER] for 1 sec. to manually tune the antenna.

pgs. 75,

76

No contact possible with • RIT or

∂TX function is activated.

another station.

• Split frequency and/or duplex function are activated.

• Push [RIT] or [

∂TX] to turn the function OFF.

• Push [SPLIT] and/or [F2 DUP] (in M1) to turn the function OFF.

pgs. 47,

56 pgs. 44,

58

Transmit signal is unclear or distorted.

• [MIC GAIN] is set too far clockwise • Set [MIC GAIN] to a suitable position.

p. 25

Repeater cannot be accessed.

• Split frequency or duplex function is not activated.

• Programmed subaudible tone frequency is wrong.

• Push [SPLIT] and/or [F2 DUP] (in M1) to turn the function ON

• Reset the frequency using set mode.

pgs. 44,

58 p. 45

Programmed scan does • Squelch is open.

not stop.

• [RF/SQL] is assigned to RF gain control and squelch is open.

• Set [RF/SQL] to the threshold point.

• Reset [RF/SQL] control assignment and set it to the threshold point.

p. 24 pgs. 24,

81

Programmed scan does

• The same frequencies have been programmed not start.

in scan edge memory channels P1 and P2.

• Program different frequencies in scan edge p. 65 memory channel P1 and P2.

Memory scan does not • 2 or more memory channels have not been start programmed.

• Program more than 2 memory channels.

p. 62

Select memory scan does not start

• 2 or more memory channels have not been designated as select channels.

• Designate more than 2 memory channels as p. 71 select channels for the scan.

MAINTENANCE

13

PROBLEM

The displayed frequency • The dial lock function is activated.

does not change properly.

• A set mode screen is selected.

• The internal CPU has malfunctioned.

■ Fuse replacement

If a fuse blows or the transceiver stops functioning, try to fi nd the source of the problem, and replace the damaged fuse with a new, rated fuse.

The IC-7400 has 2 types of fuses installed for transceiver protection.

• DC power cable fuses …………………… FGB 30 A

• Circuitry fuse ……………………………… FGB 5 A

D DC power cable fuse replacement

Refer the fi gure illustrated at right for the DC power cable fuse replacement.

SOLUTION REF.

• Push [LOCK/SPCH] to turn the function OFF.

• Push [MENU] several times to exit the set mode.

• Reset the CPU.

p. 52

— p. 93

CAUTION:

DISCONNECT the DC power cable from the transceiver when changing a fuse.

30 A fuse

D Circuitry fuse replacement

The 13.8 V DC from the DC power cable is applied to all units in the IC-7400, except for the power amplifi er, through the circuitry fuse. This fuse is installed in the

PA unit.

q Remove the top cover as shown on p. 89.

w Remove the 11 screws from the PA shielding plate, then remove the plate.

e Replace the circuitry fuse as shown in the diagram at right.

r Replace the PA shielding plate and top cover.

Fuse

■ Tuning dial brake adjustment

The tension of the tuning dial may be adjusted to suit your preference.

The brake adjustment screw is located on the right side of the tuning dial. See the fi gure at right.

Turn the brake adjustment screw clockwise or counterclockwise to obtain a comfortable tension level while turning the dial continuously and evenly in one direction.

Light

Heavy

92

93

13

MAINTENANCE

■ Resetting the CPU

When fi rst applying power or when the function does not seem to be operating normally, reset the CPU as follows: q Make sure the transceiver power is OFF.

w While pushing [M-CL] and [F-INP], push [POWER] for 1 sec. to turn power ON.

• The internal CPU is reset.

resetting is complete.

e Correct the set mode settings after resetting, if desired.

NOTE: Resetting CLEARS all programmed contents in memory channels and returns programmed values in set mode to default values.

[POWER] [F-INP] [M-CL]

■ Frequency calibration

(approximate)

A very accurate frequency counter is required to calibrate the frequency of the transceiver. However, a rough check may be performed by receiving radio station WWV, or other standard frequency signals.

CAUTION:

Your transceiver has been thoroughly adjusted and checked at the factory before being shipped. You should not calibrate frequencies, except for special reasons.

q Push [SSB] to select USB mode.

w Push [PBTC] for 1 sec. to clear the PBT settings and make sure that the RIT/

∂TX function is not activated.

e Set the frequency to the standard frequency station minus 1 kHz.

quency, set the operating frequency for 9.999.00 MHz.

• Other standard frequencies can also be used.

r Push [MENU] several times to select M1 or M2, if necessary.

t Push [MENU] for 1 sec. to select the set mode screen.

y Push [F1 ≤] or [F2 ≥] several times to select the

CAL. Marker item.

u Rotate the tuning dial clockwise to turn the calibration marker ON.

• Side tone may be heard.

i Adjust [CAL] pot on the rear side of the transceiver for a zero beat with the received standard signal.

frequency, resulting in a single tone being emitted.

o Rotate the tuning dial counterclockwise to turn the calibration marker OFF.

!0 Push [MENU] to exit set mode.

[MENU] [SSB] [PBTC]

[RF/SQL] [AF] [P.AMP/ATT] [RIT] [CLEAR]

• Calibration marker item

C A L . M a r k e r

5 O N

[CAL]

CONTROL COMMAND

14

■ Remote jack (CI-V) information

• CI-V connection example

The transceiver can be connected through an optional

CT-17

CI-V LEVEL CONVERTER

to a personal computer equipped with an RS-232C port. The Icom Communications Interface-V (CI-V) controls the following functions of the transceiver.

Up to 4 Icom CI-V transceivers or transceivers can be connected to a personal computer equipped with an

RS-232C port. See p. 87 for setting the CI-V condition using set mode.

• Data format

The CI-V system can be operated using the following data formats. Data formats differ according to command numbers. A data area or sub command is added for some commands.

Controller to IC-7400

q w e r t y

FE FE 66 E0 Cn Sc Data area u

FD

IC-7400

9–15 V

DC

BC-25

(optional) ct-17 mini-plug cable

OK message to controller

FE FE E0 66 FB FD personal computer

FE FE E0 66 Cn Sc Data area q w

IC-7400 to controller

e r t y

• Command table

Description

00 — Send frequency data

01 Same as Send mode data command

02

03

04

05

06

07

—

—

—

—

00

01

02

03

04

—

00

01

A0

Read band edge frequencies

Read operating frequency

Read operating mode

Set operating frequency

Select

Select

Select

Select

Select

05 Select

07 Select

08 Select

Select VFO mode

Select VFO A

Select VFO B

Equalize VFO A and VFO B

FD u

FE FE E0 66 FA FD

NG message to controller

07

08

09

0A

0B

0C

0D

0E

B0

Description

Exchange VFO A and VFO B

— Select memory mode

0001–0101* Select memory channel

*P1=0100,

0102 Select the call channel

— Memory

— Memory to VFO

— Memory

—

—

Read offset frequency

Set offset frequency

00 Scan

01 Programmed/memory scan start

02 Programmed scan start

03

∂F scan start

12 Fine programmed scan start

13 Fine

22 Memory scan start

23 Select memory scan start

94

14

CONTROL COMMAND

95

11

0F

10

• Command table (continued)

Description

0E

12

13

14

15

16

00

01

10

11

12

B0

B1

D0

D3

00

01

02

03

04

05

06

07

08

A2=±10 kHz, A3=±20 kHz,

A4=±50 kHz, A5=±100 kHz,

A6=±500 kHz, A7=±1 MHz)

Set as non-select channel

Set as select channel

Set scan resume OFF

Set scan resume ON

Turn the split function OFF

Turn the split function ON

Select simplex operation

Select –DUP operation

Select +DUP operation

Select 10 Hz (1 Hz) tuning step

Select 100 Hz tuning step

Select 1 kHz tuning step




Select 12.5 kHz tuning step



— Select/read attenuator (0=OFF,

1=ON)

— Select/read antenna selection

(0=ANT1, 1=ANT2)

00

01

02

Announce with voice synthesizer

(00=all data; 01=frequency and

S-meter level; 02=receive mode)

01 + Level data [AF] level setting (0=max. CCW to

255=max. CW)

02 + Level data [RF] level setting (0=max. CCW to

255=11 o’clock)

03 + Level data [SQL] level setting (0=11 o’clock to

255=max. CW)

06 + Level data [NR] level setting (0=min. to

255=max.)

07 + Level data Inside [TWIN PBT] setting or

IF shift setting (0=max. CCW,

128=center, 255=max. CW)

08 + Level data Outside [TWIN PBT] setting

( 0=max. CCW, 128=center,

255=max. CW)

09 + Level data [CW PITCH] setting (0=300 Hz,

128=600 Hz, 255=900 Hz)

0A + Level data [RF PWR] setting (0=mini. to

255=max.)

0B + Level data [MIC GAIN] setting (0=mini. to

255=max.)

0C + Level data [KEY SPEED] setting (0=slow to

255=fast)

0D + Level data [NOTCH] setting (0=low freq. to

255=high freq.)

0E + Level data COMP Level Delay setting (0=0 to

10=10)

0F + Level data Break-IN DELAY setting (20=2.0d to 130=13.0d)

01

02

11

12

13

Read squelch condition

Read S-meter level

Read RF power meter

Read SWR meter

Read ALC meter

02 Preamp (0=OFF; 1=preamp 1;

2=preamp 2)

16

19

1A

Description

12 AGC selection (0=OFF; 1=Slow;

2=Mid; 3=Fast)

22

40

Noise blanker (0=OFF; 1=ON)

Noise reduction (0=OFF; 1=ON)

41

42

Auto notch (0=OFF; 1=ON)

Repeater tone (0=OFF; 1=ON)

43 Tone squelch (0=OFF; 1=ON)

44 Speech compressor (0=OFF; 1=ON)

48

49

4B

4C

45

46

Monitor (0=OFF; 1=ON)

VOX function (0=OFF; 1=ON)

47 Break-in (0=OFF; 1=semi breakin; 2=full break-in)

Manual notch (0=OFF; 1=ON)

RTTY fi lter (0=OFF; 1=ON)

DTCS (0=OFF; 1=ON)

VSC (0=OFF; 1=ON)

00 Read the transceiver ID

00 Send/read memory contents (see p. 97 for details)

01 Send/read band stacking register contents (see p. 97 for details)

02 Send/read memory keyer contents (see p. 97 for details)

03 Send/read the selected fi lter width

(0=50 Hz to 40/31=3600/2700 Hz)

04 Send/read the selected AGC time constant (0=OFF, 1=0.1/0.3 sec. to 13=6.0/8.0 sec.)

255=100%)

255=100%)

255=max.)

1=ON)

(0=OFF, 1=ON)

(0=OFF, 1=ON)

(0=OFF, 1=ON)

(0=Auto, 1=SQL, 2=RF+SQL)

(0=OFF, 1=ON)

(0=OFF, 1=ON)

1=ON)

+9.999 MHz (see p. 98 for details)

1=ON)

9.999 MHz for HF (see p. 98 for details)

9.999 MHz for 50 MHz band (see p. 98 for details) to 9.999 MHz for 144 MHz band

(see p. 98 for details)

CONTROL COMMAND

14


1A

Description

0517 Send/read one touch repeater set

(0=DUP–, 1=DUP+)

(0=OFF, 1=ON-1, 2=ON-2)

(0=OFF, 1=ON)

1=ON)

(0=OFF, 1=ON)

(0=OFF, 1=Manual, 2=Auto)

(0=English, 1=Japanese)

1=Fast)

1=ON)

(0=5 ch, 1=10 ch)

(0=OFF, 1=Low, 2=High)

(0=Low, 1=High)

0529

∂TX clear function (0=OFF, 1=ON) popup set (0=OFF, 1=ON) set (0=OFF, 1=ON) tuning function (0=OFF, 1=ON)

(0=LSB, 1=USB)

(0=Keyer-root, 1=Keyer-send)

(0=OFF, 1=Keyer send)

(0=OFF, 1=ON)

(0=OFF, 1=ON) level set (0=0 to 10=10) level (0 =–5 to 10=+5) level (0=–5 to 10=+5) level (0 =–5 to 10=+5) level (0=–5 to 10=+5) level (0 =–5 to 10=+5) level (0=–5 to 10=+5) level (0 =–5 to 10=+5) level (0=–5 to 10=+5) level (0 =–5 to 10=+5)

1A

Description

0548 Send/read FM TX Tone (Treble) level (0=–5 to 10=+5) level (0 =–5 to 10=+5) level (0=–5 to 10=+5)

Send/read contact number style

( 0=Normal, 1=190

ANO,

2=190

ANT, 3=90NO, 4=90

NT) nel (1=M1, 2=M2, 3=M3, 4=M4)

9999)

(0=min. to 255=max.)

(0=OFF, 1=ON)

(1=1 sec. to 60=60 sec.) ratio (28=1:1:2.8 to 45=1:1:4.5)

1=4 msec., 2=6 msec., 3=8 msec.)

(0=Normal, 1=Reverse)

1=Bug-key, 2=ELEC-Key)

(0=OFF, 1=ON)

0563

( 0=250 Hz, 1=300 Hz, 2=350 Hz,

3=500 Hz, 4=1 kHz)

Send/read twin peak fi lter

(0=OFF, 1=ON)

( 0=1275 Hz, 1=1615 Hz,

2=2125 Hz)

(0=170 Hz, 1=200 Hz, 2=425 Hz)

(0=Normal, 1=Reverse)

(0=OFF, 1=ON) code (0=CR,LF,CR+LF, 1=CR+LF) coder line (0=2 lines, 1=3 lines)

1=High)

1=ON)

255=100%)

255=100%)

255=100%) to 20=2.0 sec.)

(20=2.0d to 130=13.0d)

96

97

14

CONTROL COMMAND


1A

1B

1C

Description

0577 Send/read MONITOR level (0=0% to 255=100%)

06 Send/read DATA mode (0=OFF,

1=ON)

07 Send/read SSB transmit bandwidth

(0=WIDE, 1=MID, 2=NAR)

08 Send/read DSP fi lter shape

( 0= sharp, 1= soft)

00 Set/read repeater tone frequency


01 Set/read TSQL tone frequency


02 Set/read DTCS code and polarity


00 Set/read the transceiver’s condition (0=Rx; 1=Tx)

01 Set/read antenna tuner condition

( 0=OFF, 1=ON, 2=Start tuning or while tuning)

D To send/read memory contents

When sending or reading memory contents, additional code as follows must be added to appoint the memory channel.

➥ Additional code: 0000–0102

(0100=P1, 0101=P2, 0102=Call)

D Band stacking register

To send or read the desired band stacking register’s contents, combined code of the frequency band and register codes as follows are used.

For example, when sending/reading the oldest contents in the 21 MHz band, the code “0703” is used.

• Frequency band code

Code Frequency band Frequency range (unit: MHz)

01 1.8

02

03

3.5

7

04

05

10

14

9.900000–10.499999

13.900000–14.499999

06

07

08

09

10

11

12

18

21

24

28

50

144

GENE

17.900000–18.499999

20.900000–21.499999

24.400000–25.099999

28.000000–29.999999

50.000000–54.000000

144.000000–148.000000

Other than above

• Register code

Code

01

02

03

Registered number

2

D Codes for memory keyer contents

To send or read the desired memory keyer contents, the channel and character codes as follows are used.

• Channel code

Code

01

02

03

04

Channel number

M1

M2

M3

M4

• Character’s code

Character ASCII code

0–9

A–Z

30–39 Numerals

Description

space

/

20 Word

2F Symbol

?

,

3F Symbol

2C Symbol

. 2E Symbol

^ 5E e.g., to send

BT

, enter ^4254

✱ 2A used for 1 channel only)

D Codes for memory name contents

To send or read the desired memory name settings, the character codes, instructed codes for memory keyer contents as above, and follows are additionally used.

• Character’s code— Alphabetical characters

— a–z 61–7A

• Character’s code— Symbols

—

! 21 # 23

$ 24 % 25

&

?

26

3F

¥

”

5C

22

’ 27 ` 60

+ 2B – 2D

: 3A ; 3B

= 3D < 3C

> 3E ( 28

)

]

29

5D

[

{

5B

7B

} 7D | 7C

_ 5F

– 7E

D Split/Duplex frequency setting

The following data sequence is used when sending/reading the split or duplex frequency setting.

X q

0 X w

X 0 e

X r*

XX

*No need to enter for duplex frequency setting.

D Repeater tone/tone squelch frequency setting

The following data sequence is used when sending/reading the DTCS code and polarity setting.

q* w e

0 0 X X X X

*Not necessary when setting a frequency.

D DTCS code and polarity setting

The following data sequence is used when sending/reading the DTCS code and polarity setting.

q w e

X X 0 X X X

CONTROL COMMAND

14

98

15

SPECIFICATIONS

99

• General

• Frequency coverage :

(Unit: MHz)

*

2

Transmit 1.999999*

2

• Receiver

• Receive system : Triple conversion

• Intermediate frequencies: superheterodyne system

*

1

Some frequency ranges are not guaranteed.

*

2

Depending on version.

• Mode

• No. of memory ch.

: USB, LSB, CW, RTTY, AM, FM

: 102

( 99 regular, 2 scan edges and 1 call)

• Antenna connector : SO-239

3

(2 for HF/50 MHz and 1 for 144 MHz; 50

Ω)

• Operating temp. range : –10˚C to +60˚C ; +14˚F to +140˚F

• Frequency stability : Less than ±7 ppm from 1 min. to 60 min. after power ON. After that, rate of stability is less than

±1 ppm/hr. at 25˚C

(+77˚F)

.

Temperature fl uctuations 0˚C to

+50˚C

(+20˚F to +122˚F)

less than

±5 ppm.

• Frequency resolution : 1 Hz

• Power supply

• Power consumption :

: 13.8 V DC ±15%

(negative ground)

Transmit Max. power 23.0 A

• Dimensions

(projections not incl.)

• Weight (approx.)

• ACC 1 connector

• ACC 2 connector

• DATA connector

• CI-V connector

Max. audio 3.0 A

: 287(W)

120(H)316.5(D) mm

13

5

⁄

16

(W)

4

23

⁄

32

(H)

12

15

⁄

32

(D) in

: 9.0 kg; 19 lb 13 oz

: 8-pin DIN connector

: 7-pin DIN connector

: Mini DIN 6-pin

: 2-conductor 3.5 (d) mm (

1

⁄

8

)

• Transmitter

• Output power

(continuously adjustable)

:

SSB/CW/RTTY/FM Less than 5 to 100 W

AM Less than 5 to 40 W

• Modulation system :

AM Low power modulation

• Spurious emission : 50 dB

(HF bands)

60 dB

(50/144 MHz)

• Carrier suppression : 40 dB

• Unwanted sideband : 55 dB suppression

•

∂TX variable range

: ±9.99 kHz

• Mic. connector : 8-pin connector (600

Ω)

• KEY connector

3-conductor 6.35(d) mm (

1

: 3-conductor 6.35(d) mm (

1

⁄

4

)

⁄

4

)

• SEND connector : Phono

(RCA)

• ALC connector : Phono

(RCA)

• Sensitivity

(typical)

:

SSB, CW, RTTY 0.16 µV*

1

(1.80–29.99 MHz)

(10 dB S/N)

µV*

2

(50 MHz)

AM

(10 dB S/N)

13

2 µV*

1

(1.80–29.99 MHz)

1 µV

(50

*

2

/144

*

3

MHz)

FM

(12 dB SINAD)

0.5

1

(28.0–29.99 MHz)

*

1

Pre-amp 1 is ON, *

2

Pre-amp 2 is ON, *

3

Pre-amp is ON

• Squelch sensitivity

(Pre-amp: OFF)

:

SSB, CW, RTTY Less than 5.6 µV

FM

• Selectivity :

Less than 1.0 µV

SSB

(BW: 2.4 kHz)

More than 2.4 kHz/–6 dB

Less than 3.6 kHz/–60 dB

CW

(BW: 500 Hz)

More than 500 Hz/–6 dB

Less than 700 Hz/–60 dB

RTTY

(BW: 350 Hz)

More than 360 Hz/–6 dB

Less than 650 Hz/–60 dB

AM

(BW: 6 kHz)



FM

(BW: 15 kHz)



• Spurious and image rejection ratio:

HF/50 MHz More than 70 dB

(except IF through

144 MHz on 50 MHz band)

More than 60 dB

• AF output power

(at 13.8 V DC)

: More than 2.0 W at 10% distortion

with an 8

Ω load

• RIT variable range : ±9.99 kHz

• PHONES connector : 3-conductor 6.35 (d) mm (

• Ext. SP connector : 2-conductor 3.5 (d) mm (

1

1

⁄

4

)

⁄

8

)/8 Ω

• Antenna tuner

• Matching impedance range:

HF bands 16.7 to 150

Ω unbalanced

50 MHz band

(Less than VSWR 3:1)

20 to 125

Ω unbalanced

(Less than VSWR 2.5:1)

• Minimum operating input power

• Tuning accuracy

• Insertion loss

15 W

(50 MHz band)

: VSWR 1.5:1 or less

: Less than 1.0 dB

(after tuning)

All stated specifi cations are typical and subject to change without notice or obligation.

IC-PW1/EURO

HF/50 MHz ALL BAND 1 kW LINEAR AMPLIFIER

OPTIONS

16

PS-125

DC POWER SUPPLY

Full-duty 1 kW linear amplifi er including an automatic antenna tuner. Has automatic tuning and band selection capability. Full break-in (QSK) operation is possible. The amplifi er/power supply unit and the remote control unit are separated.

Light weight switching regulator system power supply.

• Output voltage: 13.8 V DC

• Max. current drain: 25 A

AH-4

HF/50 MHz AUTOMATIC

ANTENNA TUNER

AH-2b

ANTENNA ELEMENT

SM-20

DESKTOP MICROPHONE

Specially designed to tune a long wire antenna for portable or mobile

HF operation. The PTT tuner start function provides simple operation.

• Input power rating: 120 W

SP-21

EXTERNAL SPEAKER

Designed for base station operation.

• Input impedance: 8

Ω

• Max. input power: 5 W

A 2.5 m long antenna element for mobile operation with the AH-4.

• Frequency coverage:

7–54 MHz bands with the AH-4

Unidirectional, electret microphone for base station operation. Includes

[UP]/[DOWN] switches and a low cut function.

CT-17

CI

-

V LEVEL CONVERTER

For remote transceiver control using a personal computer. You can change frequencies, operating mode, memory channels, etc.

UT-102


Announces the receive frequency, mode and S-meter level in a clear, electronically-generated voice, in English (or Japanese).

SP-20

EXTERNAL SPEAKER

4 audio fi lters; headphone jack; can connect to 2 transceivers.

• Input impedance: 8

Ω

• Max. input power: 5 W

CR-338

HIGH STABILITY CRYSTAL UNIT

Contains a temperature-compensating oven heater and crystal unit for improved frequency stability.

• Frequency stability: ±0.5 ppm

HM-36

HAND MICROPHONE

Hand microphone equipped with [UP]/

[DOWN] switches.

• About DC power supply

The use of IC-7400 (#03, #04, #05, #08, #09) in combination with the DC power supply complies with European Harmonised Standard regulations under the conditions listed below.

Conditions

• In combination with PS-125

100

17

ABOUT CE

101

INSTALLATION NOTES

For amateur base station installations it is recommended that the forwards clearance in front of the antenna array is calculated relative to the EIRP (Effective Isotropic Radiated Power). The clearance height below the antenna array can be determined in most cases from the RF power at the antenna input terminals.

As different exposure limits have been recommended for different frequencies, a relative table shows a guideline for installation considerations.

Below 30 MHz, the recommended limits are specifi ed in terms of V/m or A/m fi elds as they are likely to fall within the near-fi eld region. Similarly, the antennae may be physically short in terms of electrical length and that the installation will require some antenna matching device which can create local, high intensity magnetic fi elds. Analysis of such MF installations is best considered in association with published guidance notes such as the FCC OET Bulletin 65 Edition 97-01 and its annexes relative to amateur transmitter installations. The EC recommended limits are almost identical to the FCC specifi ed ‘uncontrolled’ limits and tables exist that show pre-calculated safe distances for different antenna types for different frequency bands. Further information can be found at http://www.arrl.org/.

• Typical amateur radio installation

Exposure distance assumes that the predominant radiation pattern is forwards and that radiation vertically downwards is at unity gain (sidelobe suppression is equal to main lobe gain). This is true of almost every gain antenna today. Exposed persons are assumed to be beneath the antenna array and have a typical height to 1.8 m.

The fi gures assume the worst case emission of constant carrier.

For the bands 10 MHz and higher the following power density limits have been recommended:

10–144 MHz 2 W/sq m

EIRP clearance heights by frequency band

1 Watts 2.1 m

10 Watts 2.8 m

25 Watts 3.4 m

100 Watts 5 m

1000 Watts 12 m

Forward clearance, EIRP by frequency band

100 Watts 2 m

1000 Watts 6.5 m

10,000 Watts 20 m

100,000 Watts 65 m

In all cases any possible risk depends on the transmitter being activated for long periods. (actual recommendation limits are specifi ed as an average during 6 minutes) Normally the transmitter is not active for long periods of time. Some radio licenses will require that a timer circuit automatically cuts the transmitter after 1–

2 minutes etc.

Similarly some types of transmitter, SSB, CW, AM etc. have a lower ‘average’ output power and the assessed risk is even lower.

Versions of the IC-7400 which display the

“CE” symbol on the serial number seal, comply with the essential requirements of the European Radio and Telecommunication Terminal Directive 1999/5/EC.

This warning symbol indicates that this equipment operates in non-harmonised frequency bands and/or may be subject to licensing conditions in the country of use. Be sure to check that you have the correct version of this radio or the correct programming of this radio, to comply with national licensing requirement.

• List of Country codes (ISO 3166-1)

Country Codes Country Codes

1 Austria

2 Belgium

3 Bulgaria

AT

BE

BG

4 Croatia HR

5 Czech Republic CZ

6 Cyprus

7 Denmark

CY

DK

8 Estonia

9 Finland

10 France

11 Germany

12 Greece

13 Hungary

14 Iceland

15 Ireland

16 Italy

17 Latvia

EE

FI

FR

DE

GR

HU

IS

IE

IT

LV

18 Liechtenstein

19 Lithuania

20 Luxembourg

21 Malta

22 Netherlands

23 Norway

24 Poland

25 Portugal

26 Romania

27 Slovakia

28 Slovenia

PT

RO

SK

SI

29 Spain

30 Sweden

31 Switzerland

32 Turkey

ES

SE

CH

TR

33 United Kingdom GB

LI

LT

LU

MT

NL

NO

PL

DECLARATION

OF CONFORMITY

We Icom Inc. Japan

1-1-32, Kamiminami, Hirano-ku

Osaka 547-0003, Japan

Declare on our sole responsibility that this equipment complies with the essential requirements of the Radio and Telecommunications Terminal

Equipment Directive, 1999/5/EC, and that any applicable Essential Test

Suite measurements have been performed.

Kind of equipment: HF/VHF ALL MODE TRANSCEIVER

Type-designation:

i7400

Version (where applicable):

This compliance is based on conformity according to Annex III of the directive 1999/5/EC using the following harmonised standards: i) EN 301 489-1 v1.4.1 (2002-08) ii) EN 301 489-15 V1.2.1 (2002-08) iii) EN 301 783-2 V1.1.1 (2000-09) iv) EN 60950-1 (2001): A11: 2004 v)

Düsseldorf 1st Aug. 2007

Place and date of issue

Icom (Europe) GmbH

Himmelgeister straße 100

D-40225 Düsseldorf

Authorized representative name

H. Ikegami

General Manager

Signature

•Version and frequency coverage

Europe (#03)

Receive Transmit

Italy (#08)

Receive

Transmit

ABOUT CE

17

France (#04)

Receive Transmit

Spain (#09)

Receive

Transmit

Denmark (#05)

Receive Transmit

102

IC-7400

#03 (Europe)

< Intended Country of Use >

AT

FI

IT

PL

GB

RO

BE

FR

LV

PT

IS

TR

CY

DE

LT

SK

LI

HR

CZ

GR

LU

SI

NO

DK

HU

MT

ES

CH

EE

IE

NL

SE

BG

IC-7400

#04 (France)

IC-7400

#05 (Denmark)


AT

FI

IT

PL

GB

RO

BE

FR

LV

PT

IS

TR

CY

DE

LT

SK

LI

HR

CZ

GR

LU

SI

NO

DK

HU

MT

ES

CH

EE

IE

NL

SE

BG

IC-7400

#08 (Italy)


AT

FI

IT

PL

GB

RO

BE

FR

LV

PT

IS

TR

CY

DE

LT

SK

LI

HR

CZ

GR

LU

SI

NO

DK

HU

MT

ES

CH

EE

IE

NL

SE

BG


AT

FI

IT

PL

GB

RO

BE

FR

LV

PT

IS

TR

CY

DE

LT

SK

LI

HR

CZ

GR

LU

SI

NO

DK

HU

MT

ES

CH

EE

IE

NL

SE

BG

IC-7400

#09 (Spain)


AT

FI

IT

PL

GB

RO

BE

FR

LV

PT

IS

TR

CY

DE

LT

SK

LI

HR

CZ

GR

LU

SI

NO

DK

HU

MT

ES

CH

EE

IE

NL

SE

BG

A-6086H-1EX-wa

Printed in Japan

© 2002–2016 Icom Inc.

Printed on recycled paper with soy ink.

1-1-32 Kamiminami, Hirano-ku, Osaka 547-0003, Japan

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