ICOM IC-A110 VHF Air Band Transceiver Service Manual
The ICOM IC-A110 is a VHF air band transceiver with 20 memory channels and a 9.0 W RF output power. It supports both 25 kHz and 8.33 kHz channel spacing, offering flexibility for various applications. The device includes features like a double conversion superheterodyne receiver system, an AGC circuit, and an APC circuit. It also features a squelch circuit and a PLL circuit for frequency stability.
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SERVICE
MANUAL
VHF AIR BAND TRANSCEIVER
iA110
MANUAL
VHF AIR BAND TRANSCEIVER
iA110
ORDERING PARTS
Be sure to include the following four points when ordering
replacement parts:
1. 10-digit order numbers
2. Component part number and name
3. Equipment model name and unit name
4. Quantity required
<SAMPLE ORDER>
1130008830 S.IC TB31207AFN IC-A110 MAIN UNIT 5 pieces
8810009130 Screw BT M3x12 NI-ZU IC-A110 Bottom cover 10 pieces
Addresses are provided on the inside back cover for your
convenience.
INTRODUCTION
This service manual describes the latest service informa-
tion for the IC-A110 VHF AIR BAND TRANSCEIVER at the
time of publication.
MODEL
IC-A110
VERSION SYMBOL
General GEN
General-1 GEN-1
U.S.A. USA
U.S.A.-1 USA-1
To upgrade quality, any electrical or mechanical parts and
internal circuits are subject to change without notice or
obligation.
DANGER
NEVER connect the transceiver to an AC outlet or to a DC
power supply that uses more than 16 V. This will ruin the
transceiver.
DO NOT expose the transceiver to rain, snow or any liquids.
DO NOT reverse the polarities of the power supply when
connecting the transceiver.
DO NOT apply an RF signal of more than 20 dBm (100 mW)
to the antenna connector. This could damage the trans-
ceiver’s front end.
REPAIR NOTES
1. Make sure a problem is internal before disassembling
the transceiver.
2. DO NOT open the transceiver until the transceiver is
disconnected from its power source.
3. DO NOT force any of the variable components. Turn
them slowly and smoothly.
4. DO NOT short any circuits or electronic parts. An insu-
lated tuning tool MUST be used for all adjustments.
5. DO NOT keep power ON for a long time when the trans-
ceiver is defective.
6. DO NOT transmit power into a signal generator or a
sweep generator.
7. ALWAYS connect a 50 dB to 60 dB attenuator between
the transceiver and a deviation meter or spectrum ana-
lyzer when using such test equipment.
8. READ the instructions of test equipment thoroughly
before connecting equipment to the transceiver.
Be sure to include the following four points when ordering
replacement parts:
1. 10-digit order numbers
2. Component part number and name
3. Equipment model name and unit name
4. Quantity required
<SAMPLE ORDER>
1130008830 S.IC TB31207AFN IC-A110 MAIN UNIT 5 pieces
8810009130 Screw BT M3x12 NI-ZU IC-A110 Bottom cover 10 pieces
Addresses are provided on the inside back cover for your
convenience.
INTRODUCTION
This service manual describes the latest service informa-
tion for the IC-A110 VHF AIR BAND TRANSCEIVER at the
time of publication.
MODEL
IC-A110
VERSION SYMBOL
General GEN
General-1 GEN-1
U.S.A. USA
U.S.A.-1 USA-1
To upgrade quality, any electrical or mechanical parts and
internal circuits are subject to change without notice or
obligation.
DANGER
NEVER connect the transceiver to an AC outlet or to a DC
power supply that uses more than 16 V. This will ruin the
transceiver.
DO NOT expose the transceiver to rain, snow or any liquids.
DO NOT reverse the polarities of the power supply when
connecting the transceiver.
DO NOT apply an RF signal of more than 20 dBm (100 mW)
to the antenna connector. This could damage the trans-
ceiver’s front end.
REPAIR NOTES
1. Make sure a problem is internal before disassembling
the transceiver.
2. DO NOT open the transceiver until the transceiver is
disconnected from its power source.
3. DO NOT force any of the variable components. Turn
them slowly and smoothly.
4. DO NOT short any circuits or electronic parts. An insu-
lated tuning tool MUST be used for all adjustments.
5. DO NOT keep power ON for a long time when the trans-
ceiver is defective.
6. DO NOT transmit power into a signal generator or a
sweep generator.
7. ALWAYS connect a 50 dB to 60 dB attenuator between
the transceiver and a deviation meter or spectrum ana-
lyzer when using such test equipment.
8. READ the instructions of test equipment thoroughly
before connecting equipment to the transceiver.
TABLE OF CONTENTS
SECTION 1 SPECIFICATIONS
SECTION 2 INSIDE VIEWS
SECTION 3 CIRCUIT DESCRIPTION
3 - 1 RECEIVER CIRCUITS............................................................................................................................. 3 - 1
3 - 2 TRANSMITTER CIRCUITS ..................................................................................................................... 3 - 3
3 - 3 PLL CIRCUITS......................................................................................................................................... 3 - 4
3 - 4 POWER SUPPLY CIRCUITS .................................................................................................................. 3 - 5
3 - 5 PORT ALLOCATIONS ............................................................................................................................. 3 - 5
SECTION 4 ADJUSTMENT PROCEDURES
4 - 1 PREPARATION ....................................................................................................................................... 4 - 1
4 - 2 PLL ADJUSTMENT.................................................................................................................................. 4 - 3
4 - 3 TRANSMITTER ADJUSTMENT .............................................................................................................. 4 - 3
4 - 4 RECEIVER ADJUSTMENT...................................................................................................................... 4 - 5
SECTION 5 PARTS LIST
SECTION 6 MECHANICAL PARTS AND DISSASEMBLY
SECTION 7 SEMI-CONDUCTOR INFORMATION
SECTION 8 BOARD LAYOUTS
8 - 1 FRONT UNIT ........................................................................................................................................... 8 - 1
8 - 2 MAIN UNIT............................................................................................................................................... 8 - 3
SECTION 9 BLOCK DIAGRAM
SECTION 10 VOLTAGE DIAGRAM
10 - 1 FRONT UNIT ..........................................................................................................................................10 - 1
10 - 2 MAIN UNIT..............................................................................................................................................10 - 2
SECTION 1 SPECIFICATIONS
SECTION 2 INSIDE VIEWS
SECTION 3 CIRCUIT DESCRIPTION
3 - 1 RECEIVER CIRCUITS............................................................................................................................. 3 - 1
3 - 2 TRANSMITTER CIRCUITS ..................................................................................................................... 3 - 3
3 - 3 PLL CIRCUITS......................................................................................................................................... 3 - 4
3 - 4 POWER SUPPLY CIRCUITS .................................................................................................................. 3 - 5
3 - 5 PORT ALLOCATIONS ............................................................................................................................. 3 - 5
SECTION 4 ADJUSTMENT PROCEDURES
4 - 1 PREPARATION ....................................................................................................................................... 4 - 1
4 - 2 PLL ADJUSTMENT.................................................................................................................................. 4 - 3
4 - 3 TRANSMITTER ADJUSTMENT .............................................................................................................. 4 - 3
4 - 4 RECEIVER ADJUSTMENT...................................................................................................................... 4 - 5
SECTION 5 PARTS LIST
SECTION 6 MECHANICAL PARTS AND DISSASEMBLY
SECTION 7 SEMI-CONDUCTOR INFORMATION
SECTION 8 BOARD LAYOUTS
8 - 1 FRONT UNIT ........................................................................................................................................... 8 - 1
8 - 2 MAIN UNIT............................................................................................................................................... 8 - 3
SECTION 9 BLOCK DIAGRAM
SECTION 10 VOLTAGE DIAGRAM
10 - 1 FRONT UNIT ..........................................................................................................................................10 - 1
10 - 2 MAIN UNIT..............................................................................................................................................10 - 2
1 - 1
SECTION 1 SPECIFICATIONS
‘‘ GENERAL
• Frequency coverage : 118.000–136.975 MHz
• Channel spacing : 25 kHz [GEN], [GEN-1]
25 kHz/8.33 kHz [USA], [USA-1]
• Type of emission : AM (6K00A3E)
• Number of memory channels : 20 channels
• Antenna connector : SO-239 (50 Ω)
• Power supply requirement : 13.75 V DC or 27.5 V DC (negative ground)
• Current drain (at 13.75 V DC) : Transmit 5.0 A
Receive max. audio output 4.0 A
stand-by 500 mA
• Frequency stability : ±5 ppm
• Usable temperature range : –30˚C to +60˚C; –22˚F to +140˚F
• Dimensions (projections not included) : 150(W) × 50(H) × 180(D) mm; 5 29 ⁄ 32(W) × 131 ⁄ 32(H) × 73⁄ 32 (D) in
• Weight (with ant., BP-209) : 1.5 g; 3 lb 5 oz
‘‘ TRANSMITTER
• RF output power (at 13.75 V DC) : 9.0 W (typical)
• Modulation system : Last stage modulation
• Input impedance : 600 Ω
• Modulation limitting : 70–100 %
• Audio harmonic distortion : Less than 10 % (at 85 % modulation)
• Ham and noise ratio : More than 40 dB
• Spurious emissions : –16 dBm or less (except ±62.5 kHz of operating frequency)
• Antenna requirements : Standard 50 Ω antenna with a VSWR < 3 : 1
‘‘ RECEIVER
• Receive system : Double conversion superheterodyne system
• Intermediate frequencies : 1st 38.85 MHz
2nd 450 kHz
• Sensitivity : Less than 1 µV at 6 dB S/N
• Squelch sensitivity : Less than 0.35 µV at threshold
• Selectivity :
• Spurious response rejection ratio : More than 74 dBµ
• Hum and noise : More than 25 dB
• Audio output power (at 13.75 V DC) : Ext SP More than 10.0 W at 10 % distortion with an 8 Ω load
Side tone More than 100 mW at 10 % distortion with an 500 Ω load
• Audio output impedance : Ext SP 8 Ω
Side tone 500 Ω
Specifications are measured in accordance with FCC Part87 and RTCA DO-186a.
(RTCA DO-186a: Class C/E, Class 4/6)
All stated specifications are subject to change without notice or obligation.
At 25 kHz channel spacing At 8.33 kHz channel spacing
±8 kHz
±17 kHz
±25 kHz
Less than 6 dB
Less than 40 dB
Less than 60 dB
±2.778 kHz
±7.37 kHz
Less than 6 dB
Less than 60 dB
SECTION 1 SPECIFICATIONS
‘‘ GENERAL
• Frequency coverage : 118.000–136.975 MHz
• Channel spacing : 25 kHz [GEN], [GEN-1]
25 kHz/8.33 kHz [USA], [USA-1]
• Type of emission : AM (6K00A3E)
• Number of memory channels : 20 channels
• Antenna connector : SO-239 (50 Ω)
• Power supply requirement : 13.75 V DC or 27.5 V DC (negative ground)
• Current drain (at 13.75 V DC) : Transmit 5.0 A
Receive max. audio output 4.0 A
stand-by 500 mA
• Frequency stability : ±5 ppm
• Usable temperature range : –30˚C to +60˚C; –22˚F to +140˚F
• Dimensions (projections not included) : 150(W) × 50(H) × 180(D) mm; 5 29 ⁄ 32(W) × 131 ⁄ 32(H) × 73⁄ 32 (D) in
• Weight (with ant., BP-209) : 1.5 g; 3 lb 5 oz
‘‘ TRANSMITTER
• RF output power (at 13.75 V DC) : 9.0 W (typical)
• Modulation system : Last stage modulation
• Input impedance : 600 Ω
• Modulation limitting : 70–100 %
• Audio harmonic distortion : Less than 10 % (at 85 % modulation)
• Ham and noise ratio : More than 40 dB
• Spurious emissions : –16 dBm or less (except ±62.5 kHz of operating frequency)
• Antenna requirements : Standard 50 Ω antenna with a VSWR < 3 : 1
‘‘ RECEIVER
• Receive system : Double conversion superheterodyne system
• Intermediate frequencies : 1st 38.85 MHz
2nd 450 kHz
• Sensitivity : Less than 1 µV at 6 dB S/N
• Squelch sensitivity : Less than 0.35 µV at threshold
• Selectivity :
• Spurious response rejection ratio : More than 74 dBµ
• Hum and noise : More than 25 dB
• Audio output power (at 13.75 V DC) : Ext SP More than 10.0 W at 10 % distortion with an 8 Ω load
Side tone More than 100 mW at 10 % distortion with an 500 Ω load
• Audio output impedance : Ext SP 8 Ω
Side tone 500 Ω
Specifications are measured in accordance with FCC Part87 and RTCA DO-186a.
(RTCA DO-186a: Class C/E, Class 4/6)
All stated specifications are subject to change without notice or obligation.
At 25 kHz channel spacing At 8.33 kHz channel spacing
±8 kHz
±17 kHz
±25 kHz
Less than 6 dB
Less than 40 dB
Less than 60 dB
±2.778 kHz
±7.37 kHz
Less than 6 dB
Less than 60 dB
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Key Features
- 9.0 W RF output power
- 20 memory channels
- 25 kHz and 8.33 kHz channel spacing
- Double conversion superheterodyne receiver
- AGC circuit
- APC circuit
- PLL circuit
- Squelch circuit
Related manuals
Frequently Answers and Questions
What are the frequency coverage ranges of this transceiver?
The IC-A110 VHF Air Band Transceiver covers a frequency range of 118.000–136.975 MHz, according to the service manual.
What type of emission does the IC-A110 support?
It supports AM (6K00A3E) type of emission.
What are the power supply requirements for this transceiver?
The transceiver requires a 13.75 V DC or 27.5 V DC (negative ground) power supply.
What is the maximum RF power output of this transceiver?
The maximum RF power output is 9.0 W (typical) at a 13.75 V DC power supply.
What are the dimensions of the transceiver?
The dimensions are 150(W) × 50(H) × 180(D) mm; 529⁄32(W) × 131⁄32(H) × 73⁄32(D) in.
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