Swann 350A, 350D Installation, Operation And Maintenance Manual

INSTALLATION, OPERATION
AND
MAINTENANCE
SWAN MODELS 350A AND 350D
SINGLE SIDEBAND
TRANSCEIVERS
O Swan
ELECTRON 125
D PR Col e TRE
ADDENDUM TO THE 350A, 350B AND 350D
MANUAL
Although the 350A, 350B and 350D are quite similar, there are some
important differences, ‘
The 350B and 350D have had cosmetic changes to present a pleasing
new appearance, but still retain the outstanding features of the
350A.
It should be noted that on the "B' and ‘D’ models the function, metering,
and CW filter switches have been grouped for ease of operation, and
as they are identified with discriptive lettering, their use is self
explanatory.
On the "B" Model it should be noted that there is a provision for
adjusting the VFO dial to a precise frequency when used in conjunction
with the 25 KHz crystal calibrator. This circuit may be activated
by placing the three position Tune/CW, rec, cal. switch in calibrate,
and then after setting the VFO dial to the desired frequency, adjusting
the dial set to obtain correction at 25, 50 and 100 KHz intervals.
As the 350D has a digitial frequency readout it does not require this
application and therefore the Tune/CW and Rec, switch functions only
as a two position one. In addition as a convenience to the operator
there is a provision which allows him to adjust the brightness
of the readout by merely adjusting the "dial dim" potenieometer to
the desired level.
Three signigicant changes applicable to the 350B and 350D are listed
below.
1) These units have been modified so that keying of the transceiver
provides a ground to J-2, the external relay jack, and permits keying
of an external amplifier such as the Swan 1200Z. However, it is
equally compatible with other linears requiring this accomodation.
2) Control of the amount of RF output is possible when the set is
activated to the tune position. by "unbalancing' the carrier with
the carrier balance control. This amount is regulated by moving the
control as far as necessary either clockwise or counter-clockwise,
to obtain the degree of output required. Full output will be reached
only when this control is near the maximum extent of its range in
either direction, Ш
3) When operating on CW, and if a sidetone is desired, the "sidetone"
switch must be in the "on" position. If a key is not installed in
the CW key jack, the switch must be in the "off" position or undesire-
able audio feedback may occur.
INTRODUCTION
The Swan Model 350A and 850D Single Sideband Trans-
ceivers are designed to be used in either CW or SSB modes
on all portions of the 80, 40, 20, 15 and 10 meter amateur
radio bands. The model 350A incorporates a translucent,
calibrated, moveable dial while the Mode! 350D incorporates
a digital frequency display utilizing six seven-segment
display units.
Power output on all band exceeds 125 watts P.E.P. on all
single sideband frequencies and 90 watts on CW. These
transceivers include automatic gain control (AGO),
automatic level control (ALC), and grid hlock keying.
The hasic transceiver provides coverage of all portions of the
BO through 10 meter amateur bands. The internal AC power
supply permits fixed station or portahle operation wherever
117 volts 50-60 cycles is availahle. Export models for 208-
220-240 volts are availahle on special order.
For 12-14 volt DC operation in mobile, marine or portable
applications, a DC converter unit, Model 14A is available. It
attaches to the rear of the transceiver in place of the AC
power cord connector. Its dimensions are 1-1/2 x 3 x 4
inches.
The Model 350A and 350D generate single sideband signals
by means of a crystal lattice filter which removes the carrier
and one of the sidebands. Provisions are included in the
transceiver for operation on either the upper or the lower
sideband. Transmitter and receiver circuits are tuned by a
common front panel control so that the transmitter
frequency is always tuned to the indicated receiver
frequency.
The hasic sircuits of the 350A and 350D transceivers, which
are of the single conversion design, have been proven in
several thousand of the popular Swan transceivers.
Mechanical, electrical, and thermal stahility are ex-
ceptionally high. Al oscillators are temperature com-
pensated and voltage regulated. Push-to-talk operation is
standard, with provision for plug in connection of the Model
VX-2 accessory VOX unit for automatic voice control of the
transmitter,
SPECIFICATIONS
Table 1. Specifications, Model 350A and 350D.
Frequency Ranges ` RB} Meters 3.5to4.0 MHz.
40 Meters 7.0 to 7.300 MHz.
20 Meters 14.0 to 14. 350 MHz.
15 Meters 21.0 to 21.450 MHz.
10 Meters 28.0 to 29.7 MHz.
Power Output Single Sideband: 125 Watts (Approx. 10% less on 15 and 10 Meters).
CW: 90 Watts (Approx. 10% less on 15 and 10 Meters).
Distortion Meets FCC Type Acceptance requirements for spurious and, harmonic
suppression.
Unwanted Sideband Supression Unwanted sideband suppressed by more than 50 db.
Carrier Suppression
Carrier supressed hy more than 50 db.
Provided by 5500 KHz erystal lattice filter, 2700 Hz wide at 6 db down, 4600
Hz wide at 50 db down. Shape factor of 1.7 with ultimate rejection greater
Less than 0.5 microvolt at 50 ohms impedance for signal-plus noise ratio of
3 watts to 3.2 ohm load. Response essentially flat from 300 to 3000 Hz in both
Wide range pi-L network output matches resistive loads from 50 to 75 ohms.
Selectivity
than 100 db.
Receiver Sensitivity
10 db.
Audio Output and Response
receive and transmit.
Transmitter Qutput Impedance
Metering
Power amplifier cathode current 0-400 ma. on transmit, §-Meter 0-40 db over
89 on receive,
{Continued)
1
Table 1. (Continued)
Front Panel Controls
Rear Panel Controls and
Indicators
Vacuum Tube Complement
Transistor Complement
Integrated Circuits
Power Requiremente
Dimensions
Weight.
A.F. Gain, R.F. Gain, Sideband Selector, Cal-Rec-Tune/CW, Mic. Gain,
Bandswiteb, Carrier Balance, P.À. Plate Tune, Driver Tune, P.A. Load, Dial
Set. Meter Switch, CW Filter Selectivity.
Bias Potentiometer, CW key jack, Jones power connector, Antenna
jack, S-Meter zero, Auxiliary relay switebing, Headphone jack. The VOX
connector is located on tbe side of the chassis.
V1 12BA8 VFO Amplifier.
v2 12BE6 Transmit Mixer.
v3 6GK6 Driver.
v4 6MJ6 Power Amplifier.
{oC & © V5 Shkd&Power Amplifier.
v& 12BE6 Receive Mixer.
V7 12BA6 First I.F. Amplifier.
V8 12BA6 Second I.F. Amplifier.
v3 12A XT Product Detector/Receive Audio Amplfier.
v10 6GWS Audio Output.
V11 12AX7 Micropbone Amplifier.
V12 6AV6 AGC Amplifier
Q1 40673 Oscillator.
Q2 2N5670 Buffer.
Q3 MPS-H-10 Carrier Oscillator.
Al T7400 Calibrator Oscillator/Buffer.
AZ T7490 Frequency Divider.
АЗ T7490 Frequency Divider.
A4 7474 Frequency Divider (Flip-Flop.
A5 T8M05 Voltage Regulator.
A6 MC1458 Audio Filter Amplifier.
AT TSMOS Voltage Regulator.
AS MC1496 Balanced Modulator.
117V AC, 60 Hzat 4 Amperes.
(208-220-240V AC, 50 - 60 Hz at 25 Amperes Max., Export Model).
12 - 14V DC operation witb Model 14A Converter plugged into back of
transceiver. Current drain: 8 Amperes in receive mode, 12 Amperes
average with voice modulation. 25 Amperes max. in tune mode.
6-1/2 inches higb by 13 incbes wide by 11 inches deep.
{14 em by 33 em by 28 ст).
24 1bs. (10.9 Kgs).
INSTALLATION
GENERAL ,
Instellation of the Swan Models 350A and 350D transceivers
is not at all difficult and it involves only the placement ol the
transceiver in its operational area {lixed or mobile), con-
nection of power (11TVAC, 208/220/2400V AC or 12 volts DC,
as appropriate), and the connection to an antenna. The
tollowing paragraphs are, tberefore, devoted to the in-
stallation requirements involving microphones, fixed and
mobile operation, and recommended antenna types.
PRE-INSTALLATION INSPECTION
Prior to installation of the Model 350A or 350D, verify that
tbe power cord is removed from the rear panel connector.
Then remove the cover of the unit (three screws on ejther
side ol the cabinet).
WARNING
HIGH VOLTAGE, dangerous to life, is present at
the plate connection of the power amplifier tube
whenever the power supply is energized.
Locate the P.A. compartment and remove the packing
material around tbe P.A. tube. Inspect the transceiver for
any damage that may have been incurred during shipment.
If in-shipment damage is in evidence, contsct the Swan
dealer from whom you purcbased tbe transceiver or the
carrier's agent, if the unit was shipped to you by a common
carrier. Do not return the unit to the fsctory for repair of
damage incurred in shipment before the carrier's agent has
authorized repairs. Also, do not return the unit to the
factory without obtaining autborization by telepbone or
letter. Prior authorization of return insures that your unit
will be handled expeditiously on its receipt and will he
returned to you with the least delay,
Since tbe installation and tune up of tbe transceiver, as
described in the following paragraphs, requires a knowledge
of the operating procedures, it would be weil to review the
operation section of this manual prior to proceeding with the
installation instructions,
FIXED INSTALLATION
Locate the tranaceiver in an area wbich is well ventilated
and which will provide complete operational freedom ol the
front panel controls. Connect a heavy wire from earth
ground to the ground stud provided on the rear of the
chassis. Though not essential, this is recommended. Connect
the AC power cord to the 12-pin Jones connector on the rear
panel. If the transceiver is a 117 volt model, plug the power
cord into a stendard 117 volt, 50-60 cycle outlet having a
capacity of at least 10 amperes. If the transceiver is an
Export Model, it should first be set to the proper voltage
tap: 208, 220 or 240 volts, 50-60 cycles. Remove the cabinet,
and locate the terminal strip near the top of the power
transformer. There are 3 terminal lugs, and a decal indicates
the voltage tep for each. Connection has been made to the
220 volt tep at the factory. If your supply voltage is 208 or
240, unsolder tbe red wire and move it accordingly.
Connect an antenna to the transceiver which is suitable for
the band on which it is to be used.
FIXED ANTENNAS
A standard PL259 coax connector plug will fit the trans
cejver's antenna jack. A 50 or 75 ohm coaxial cable 15
recommended lor the connection between transceiver and
antenna. RG-58 or RG-59 is satislactory for runs up to 50
feet, For longer runs, the larger RG-8 or RG-11 produces
less line loss, particularly on 10 meters,
Any of the common antenna systems designed for use on the
amateur high frequency bands will work well with the Model
3504 or Model 350D. However, the amateur should consider
an antenna system which best fits his operational
requirements. For example, a rotatable beam antenna is
usually best suited on the 20, 15 and 10 meter bands for DX
operation, and an inverted "V" or similar antenna is usually
best suited for 80 and 40 meters, Methods for constructing
antennas and antenna tuners are described in detail in tbe
ARRL Antenna Handbook and similar publications. It is
recommended that these publications be consulted during
the design of any antenna system.
MOBILE INSTALLATION
Many different methods ol mobile installation are possible,
and it is expected that hams will find methods which are best
suited for their installation requirements. Swan Electronics
bas available a Mobile Mounting Kit which is suitable for
under-the-dash installations. Figure 1 shows the recom-
mended mounting metbods using tbis kit,
DC CONVERTER, MODEL 14A
For 12-14 volt DC operation in mobile installations, it will be
necessary to use the 14A converter, which plugs directly
onto the rear of the transceiver in plece of the AC power
connector. This accessory 15 available from your Swan
dealer. Refer to installation instructions supplied with the
14A converter,
MICROPHONE
The microphone input circuit of the 350A and 350D trans-
ceivers will operate properly only with bigh impedance
microphones. The operator should give serious con-
sideration to his choice of microphone sinee it's important for
good speech quality. The erystal lattice filter in the trans-
ceiver provides all the restriction necessary on audio
response and furtber restriction in the microphone is not
required. It is important that the selected microphone have
a smooth, flat response throughout the speech range. The
microphone jack on the front panel of the 350A and 350D
transceivers accepis a standard 1/4-inch diameter, three
contact microphone plug. The tip terminal will be connected
to the push-to-talk switch of the microphone to provide relay
control of the transmitter. The ring terminal will be con-
nected to the microphone element and the slecve is the
common chassis ground. The microphone manufacturer's
instructions should be followed when connecting the
microphone cable to the plug. Either a hand-held or desk
type microphone with push-to-talk contrel will provide a
suitable installation.
VOX operation requires that the microphone element be
connected to the microphone input circuit at all times. The
Swan Model 444C microphone may be used, without
modification, for either push-to-talk or VOX operation. If
other types of microphones are used, it is suggested that the
microphone manufacturer be contacted on directious for
modification of the micropbone for VOX operation,
MOBILE ANTENNAS
Mobile antenna installations are qnîte critical since the
antonna representa a number of compromises when used on
the high frequency bands. Many amateurs lose the efficiency
of their mabile antennas through improper tuning. Points to
remember ahout the mohile antenna are:
1. The “Q" of the antenna loading coil should be as bigh as
pessihle. There are several commerical models available
which are high “Q” cotls, including the Swan Models 35,
45 and 55 mobile antennns. (Contact your Swan
distributor or Swan Eleciromics for details).
2. The loading coil must be capable of handling the power
of the Model 350A or 350D without overheating. In the
TUNE position, the power ontput of the transceiver
may exceed 120 watta. Wide spaced, heavy wire loading
coils are essential,
3. The VSWR bridge is a useful instrument. Un-
fortunately it is qnite often misunderstood and,
perhaps, overrated in importance. Basically, the
VSWR bridge will indicate how close the antenna load
impedance is matched to the transmission line. With
long transmission ilnes, such as will be used in many
fixed ststion installations, it is desirable to maintain the
impedance match fairly close so as to limit power loss.
This is particulariy true at tbe higher frequencies. The
longer the line, and the higher the frequency, the more
important VSWR becomes. However, in mobile in-
stallations the transmission line seldom exceeds 20 feet
in length, and a VSWR of even 4 to 1 adds very littie to
power loss. The only time VSWR will indicate a low
figure is when the antenna presenta a load close to 50
ohms. But many mobile antennas will have a base
impedance as low as 15 or 20 ohms at their resonant
frequency. In such cases, VSWR wiil indicate 3 or 4 to 1
and yet the system will be radiating efficiently.
4. The really important factor in your mobile antenna is
that it should be carefully tuned to resenance at the
desired frequency. The fnllacy of relying entirety on the
VSWE hridge lies in the fact that it is sometimes
possible to reduce the VSWR reading by detuning the
antenna. Field strength may actually be reduced in an
effert to bring VSWR down. Since field strength is a
primary goal. we recommend a Field Strength Meter
for antenna tuning.
5. For antenna adjustment, the Swan 3504 or 350D may
be loaded lightly to ahout 100 milliamperes cathode
current instead of tbe usus! 200-300 milliamps. This will
limit tube dissipation during adjustments, and will also
heip reduce interference on the frequency. In any case,
do net turn tbe transmitter on for long periods at one
time. Turn it on just for the time required to tune and
load and obtain a field strengtb reading.
Begin the tuning adjustment with the antenna whip tuned to
the center of ita adjustment range. Set the VFO to the
desired operating frequency and tben adjust P.A. TUNE for
a dip in the front panel meter reading. Then adjust P.A.
LOAD for oue hundred milliamperes. Observe the field
strength reading. The Field Strength Meter may be set on
top of the dash, or the hood, or at an elevated location some
distence from the vehicle.
Change the whip length a hnif-incb, or so, at a time, Then
retune the P.A. for 100 milliamperes loading each time, and
check field strength. Repeat this procedure until the point of
maximum field strength is obtained. This adjustment will be
most critical on 75 meters, somewhat less eritical on 40, until
on 10 meters the adjustment will be quite broad. After
tuning the antenna to resonance, load the P A. to full power,
ALTERNATE
BRACKET
LOCATION
FRONT NO. 6X5/16 SCREWS
BRACKET 4 PLACES
ALTERNATE
MOUNTING
TWO NO. 12-24
HEX HEAD
SCREWS
NO. 10 x 3/4
SEAT SHEET METAL Nun ||
SCREWS J REAR BRACKTET
4 PLACES PLUGS INTO SLOT
FLAT WASHER MADE BY FLAT WASHER
BETWEEN CHASSIS BETWEEN CHASSIS AND
TRANSMISSION AND BOTTOM BOTTOM COVER.
HUMP
MOBILE MOUNTING, SIDE VIEW TRANSCEIVER, BOTTOM VIEW
Figure 1. Mobile Mounting on Transmission Hump,
5
OPERATION
CONTROL FUNCTIONS
Tbe names and functions of the front panel controls of tbe
Model 350A and 350D transceivers are listed in Table 2.
RECEIVE OPERATION
1.
3.
Rotate the AF GAIN Control clockwise to about the 3
o'clock position. The power switch will operate applying
voltage to the transceiver.
Wait approximately one minute to allow the tube
filaments to reach operating temperature. During this
period, perform the following steps:
Rotate BANDSWITCH to desired band.
Rotate MIC. GAIN fully counter clockwise.
Rotate CAR. BAL. control to the midscale position.
Set P.A. TUNE contro! fully counter-clockwise.
Set DRIVER control to mid-position.
Set P.A. LOAD fully counter-clockwise.
Set tuning dial to desired operating frequency.
Set RF GAIN control to its full clockwise position.
Carefully adjust the DRIVER and the P.A. TUNE
controls lor maximum receiver noise.
NOTE
The DRIVER control resonates the transmitter
driver stages and the receiver RF amplifier plate
circuit. The P.A. TUNE and P.A. LOAD controls
adjust the input and output capacitors in the
transmitter power amplifier final plate circuit, as
well as the receiver RF amplifier grid circuit.
Proper adjustment of these controls in the receive
position will result in approximately resonant
conditions in the transmitter stages.
RECEIVER TUNING
Precise tuning of a single sideband signal is very important.
Do not be satisfied to merely tune until the voice can be
understood, but take tbe extra care of setting tbe dial to the
exact spot where tbe voice sounds natural. Above all, avoid
tbe babit of tuning so that the voice is pitched higber than
normal. This is an unlortunate babit practiced by quite a
number of operators. The following points belp to explain
tbe effects of mistuning.
1.
If you tune your receiver such that the voice of the
other operator is bigber than normal pitch, you'll be off
frequency wben you transmit and your voice will sound
lower than normal pitch to the other operator. He will
then probahly retune bis dial to make you sound
natural. If this is continued, you will both gradually
waltz one another across tbe band. If both of you are
mistuning to an unnatural, higher pitch, you'll waltz
across the band twice as fast. (And someone will no
douht be zecused of frequency drift).
Mistuning of the receiver results in serious harmonic
distortion of the voice, and should be quite noticeable to
the average ear. Some operators claim that if they don't
know how the other person's voice actually sounds, they
can't tune bim in properly. However, ibis is not true.
With just a little practice, it becomes lairly easy to tune
the receiver to the natural pitch of the other operator's
voice. Some voices are relatively rich in harmonics, and
are easier to tune in than a person with a “flat” voice.
Also, a transmitter which is being operated properly
with low distortion will be easier to tune in than one
which is being overdriven and is generating excessive
distortion. When the other station is tuned in "right on
the nose”, it will sound just like “AM”, so to speak.
Remember to avoid tuning so everyone sounds higher
than normal pitch, or like Donald Duck,
A vernjer control for receiver tuning, sometimes
referred to as “incremental tuning,” is not incorporated
in the Swan 330A and 350D transceivers. Such a device
is not necessary if proper tuning habits are excerised.
Your Swan 320A or 350D will, automatically, transmit
on exactly the same frequency as the station to which
you are listening, These transceivers use the same
oscillator to control the receiver and transmitter
frequencies. If separate control ol receive and transmit
frequency is desired, the Swan-Medels-508-510X-VEO
units may be used.
MO VEO wiTh Above medels
TRANSMITTER TUNING
NOTE
The following five paragraphs contaín important
information that, when followed, will prevent
damage to the power amplifier tube. These should
be read carefully and should be kept in mind
whenever you are tuning the transmitter.
The most important detail to keep in mind when tuning
tbe transmitter portion of your Swan 350A or 350D is
that the P.A. TUNE control mmst be resonated as
quickly as possible!
This is accomplished hy adjusting tbe P.A. TUNE for
minimum meter reading with the Function switch in
Table 2. Front Panel Control Functions.
FUNCTION
Calibrate: All voltages applied to receiver.
Receive: All voltages applied to receiver.
Tune/CW: Transmitting circuits are energized. C141 is ungrounded shifting
frequency into filter passhand, Carrier is fully inserted. P.A. Cathode resistor
Controls potentiometer R87 in the grid of V11-A and controls amount of audio to
Controls potentiometer R98 in the balanced modulator and permits nulling out of
Controls variahle resistor R114. common in the grids of Receiver Mixer, R.F.
Controls potentiometer R69 in grid circuit of V10, A.F. Output, and controls
Controls C21 in frequency determining tank circuit of VFO,
Controls C40 and C50 in plate tanks of transmitter mixer and driver.
Controls C62 in pi-network to tune final power amplifier plate to resonance.
Controls C68 in pi-network to match impedance of output load. Tunes input to
Switches tank coils and associated capacitors in VFO, VFO Amplifier. Driver,
Selects S-Meter/Relative Output or P. A. Cathode current reading.
CONTROL
ON-OFF Switeb Turns power supply on and off.
CAL-REC-TUNE/CW
is switched in, reducing power.
MIC GAIN
the balanced modulator.
CAR. BAL.
carrier.
R.F. GAIN
Amplifier and V8 LF. Amplifier.
AF. GAIN
audio volume.
MAIN TUNING
DRIVER
P.A. TUNE
P.A. LOAD
Receiver R.F. Amplifier.
BANDSWITCH
Transmit Mixer and Final Amplifier.
NORM-OPP Selects upper or lower sidehand.
METER SWITCH
CW FILTER SWITCH
Selects audio pass hand for CW Receive.
TUNE position. P.A. cathode current, as indicated hy
the meter, will show a “dip” as P.A. TUNE is rotated
through resonance, Stop at the “dip,” or minimum
reading.
The P.A. tube is dissipating all the input power when it
is not in resonance, and can be permanently damaged in
just a few seconds.
When resonance bas been established, the P.A. may
operate at full power for quite awhile, although we
recommend 30 seconds as a safe maximum. But, it is
most important to realize that the 30 second limit
(which is accumulative) assumes that the P.A. TUNE
control] has been immediately resonated. This rule
applies generally to all transmitters.
5.
Do not tune more often than necessary. You should not
have to retune except when changing bands or an-
tennas. The P.A. tube will last for many menths, or
even years, of normal operation, but excessive tuning
will shorten tube life.
TRANSMITTER TUNING STEPS
1. Set the front panel controls as follows:
P.A LOAD — (3.5 MHz Band} 11 (clock.
(7.0 MHz Band) 11 O'clock.
(14.0 MHz Band} 1 O'clock.
{21.0 MHz Band) 2 O'clock.
(28.0 MHz Band} 2 O'clock.
P.A. TUNE — 9 O'clock.
ye a bi
DRIVER -- 12 O'clock.
CAR BAL — 12 O'clock.
MIC GAIN — Full Counterclockwise.
CAUTION
II the foregoing adjustments are not made as
directed, spurious signals will be produced at the
output of the transceiver.
NOTE
Initial settings for P.A. TUNE, P.A LOAD and
DRIVER can also be determined in the receive
mode by adjusting all three for maximum noise
from tbe speaker output.
2. Set the Meter switeh to P.A. CATH and the Mode
switeh to REC.
3. Key the transmitter with the microphone switch.
Adjust CAR BAL for minimum P. A. cathode current.
4. Adjust P.A. Bias control on rear panel for À Indication
on meter.
5. Key the transmitter and adjust CAR BAL control for
100 ma (1) indication on meter.
6. Quickly peak DRIVER for maximum meter indication,
then unkey transmitter.
7. Place meter switch in S-Meter position, 5-Meter reads
relative transmitter power output in S-Meter position.
8. Turn Mode switch to TUNE and quickly adjust P.A.
TUNE and P.A. LOAD for maximum meter indication.
First one, then the other. Unkey transmitter by
returning Mode switch to RECEIVE,
CAUTION
P.A. TUNE and P.A. LOAD will interact. Repeat
adjustments until further peaking is not possible.
Minimize time that transmitter is keyed. If tuning
takes more than 30 seconds, unkey transmitter for
a few seconds, then rekey and make adjusiments
quickly.
9, Place meter switch in P.A. CATH position. Kev
transmitter with microphone switch and minimize
meter reading with CAR BAL control. Unkey trans-
mitter.
10. The preceding step completes the Transmitter Tuning
procedure.
Note that the 350A and 330D operate at reduced power
in the TUNE-CW mode. The P.A. cathode bias resistor,
R36 is in the circuit during TUNE and CW operation. In
voice mode, the bias resistor is shorted out and the
transceiver operates at full rating.
|
эЁ ТОС SHALLOW,
TOO MUCH LOADING
| |
OFF RESONANCE
В
= APPROX 10% CIP,
/ CORRECT LOADING
™ DIP TOO DEEP,
NOT ENOUGH LOADING
METER HEADING,
PA CATHODE MÁ
I
JOCLOCK a — — — —P A TUNE CONTAOL- = = -— JC'CLOCK
ILLUSTRATING PROPER P A, LOAD ADJUSTMENT
AS INDICATED BY "DIP" INP A CATHODE CURRENT
WHEN TURNING PA TUNE CONTROL THROUGH
RESCONANCE
Figure 2. Interrelation of P.A. Tuning
and P.A. Cathode Current.
VOICE TRANSMISSION
After tuning up as outlined above, switch to REC position.
Press the microphone switch and then carefully set the
CAR. BAL. control for minimum meter reading. While
speaking into the mike, slowly rotate the MIC. GAIN
control until occasional peak readings of 110 to 130 ma, are
ohtained. With most microphones, the MIC. GAIN control
will he set between 9 and 12 o'clock but it may vary con-
siderably. The ALC circuit will help limit cathode current,
but turning the MIC. GAIN up too high will still produce
flat-topping and spurious signals, so it is important to hold it
down. The meter is quite heavily damped, and its reading
with average voice modulation may not look very im-
pressive, but the voice peaks are going well over the 125
watt rating of your Swan transceiver,
NOTE
Transceiver will not modulate properly with
Function Switch in CAL. position.
AM OPERATION (Single Sideband With Carrier)
1. 'Tune transmitter to full output on single sideband as
described above.
2. Rotate MIC. GAIN control to minimum, full CCW.
3. With push-to-talk button pressed, rotate CAR. BAL.
control until cathode current is approximately 75 ma.
4. While talking in a normal tone of voice into the
microphone, increase MIC. GAIN setting until the
meter kicks upward slightly. This setting will result in
excellent AM transmission.
CW OPERATION
1. Insert a CW Key in tbe Key Jack on back ol the
Transceiver.
2, Close the key and tune the transmitter as outlined in
Step 5. Power output will be approximateiy 110 watts.
3. In CW operation,it will be necessary to switch tbe
Function control back to REC. for receiving and then to
CW for transmitting.
4, When communicating on voice, the transmit and
receive frequency are identical. However, this would be
disadvantageous on CW. The Swan Models 350A and
350D use an "Off-Set CW Transmit Frequency” scheme.
During reception, the carrier oscillator is located 300 Hz
outside the passband of the crystal lattice filter. During
transmission, it is moved higher by approximately 800
Hz placing it well within tbe filter passband. This
automatic frequency shift makes it unnecessary to
retune tbe receiver after every transmission.
VOX OPERATION
To operate the Model 350A or 350D in the VOX mode. it is
only necessary to follow the instructions furnished with the
VX-2 VOX accessory.
DIAL CALIBRATION (MODEL 350A ONLY)
The Model 350A is equipped with an internal crystal con-
troiled calibrator that enables accurate calibration of the
tuning dial. The calibrator generates markers spaced
throughout the tuning range of the 350A. The odd 100 KHz
markers (3500 KHz, 3700 KHz, etc.) are the strongest and
the others are considerably weaker, To calibrate the dial,
first set the dial to a frequency that is an odd 100 KHz
harmonic of the calibrator and which is nearest to the
frequency on which you wish to operate. {For example, if
you wish to operate on 3827.5 KHz, set dial to 3900 KHz),
Turn the Mode switch to CAL and, with the DIAL SET
control, zero beat the calibrator signal. The dial is now
calibrated at 3900 KHz. Next set the dial to the 25 KHz mark
on the dial that is nearest to your selected operating
frequency (3825 KHz). Zero beat the calihrator signal heard
there. (It should require only a very small amount of
rotation of the DIAL SET control to obtain zero beat at tbis
point). The dial is now calibrated accurately in the area in
which you wish to operate and will be accurate within 100
KHz of the point of calibration.
CIRCUIT THEORY
GENERAL DISCUSSION
The Swan Models 350A and 350D transceivers provide
single sideband, suppressed carrier operation in both the
receive and transmit modes. In an amplitude modulated
(AM) system {double sideband with carrier), a radio
frequency is modulated with an audio frequency signal.
When viewing the modulated envelope on an oscilloscope, it
appears that the carrier level is merely varied at the audio
rate. However, a transmitter amplitude modulation system
is a type of mixer. Its output contains the two input
frequencies (RF and audio) and their products which are
equal to their sums and differences. (The RF circuits at the
output of the modulated stage present a very low impedance
to the modulating audio signal and it is lost from the output).
The carrier and the mixer products, which are the upper and
lower sidebands, are present at the output of the modulated
stage.
The detector stage of the AM receiver is yet another type of
mixer. One product of mixing the sidebands and carrier is a
reproduction of the audio signal that modulated the trans-
mitter. The detector load presents a low impedance to the
rectified carrier and sidebands but a relatively high im-
pedance to the recovered audio signal. Therefore, the
sidebands and carrier are lost and only the audio remains.
The AM system is inefficient since all of the intelligence 1s
contained in the sidebands which represent one-third of the
total transmitted power. The carrier contains no intelligence
whatever. Moreover, one sideband contains as much in-
tellizence as both sidebands. Therefore, if the carrier and
one sideband are suppressed, and all the available trans-
mitter energy used to transmit a single sideband, the trans-
mitter range will be measurably increased. Since less band
width is required to transmit and receive a single sideband,
more efficient use of the available spectrum is achieved as
well as improved signal to noise ratio.
In the single sideband, suppressed carrier mode of trans-
mission, only one of the sideband signals is transmitted.
The other sideband and the carrier are suppressed to
negligible levels. In addition to increasing the transmission
efficiency by a factor of four, single sideband effectively
doubles the number of stations or channels which can be
used in a given band of frequencies.
It should be remembered that in the single sideband, sup-
pressed carrier mode of transmitting, the unwanted
sideband and carrier are only suppressed, not entirely
eliminated. Thus, with a transmitted signa! from a trans-
mitter with 50 db sideband suppression, the other or un-
wanted sideband will be present, and will be transmitted,
but its level will be 50 db below the wanted sideband. When
this signal is received at a level of 20 db over 59, the un-
wanted sideband will be present at a level of approximately
55. The same is true of carrier suppression. With carrier
suppression of 60 db, and a signal level of 20 db over 59,
carrier will be present at a level of approximately 53 to 54.
10
For the following discussion refer to the schematic diagram,
and Figures 3, 4 and 8,
SIGNAL GENERATION
When the push-to-talk switch on the microphone is pressed,
the transmitter portion of the transceiver is activated, and it
generates a single sideband, suppressed carrier signal in the
following manner. Carrier is generated by Q4 Carrier
Oscillator, which is a Pierce oscillator with the crystal
operating in parallel resonance. This stage operates in both
the transmit and receive modes. When transmitting, the RF
output of the oscillator is injected into Balanced Modulator,
AS. ASis a type 1496 integrated circuit Balanced Modulator.
The amplified microphone audio and the carrier are mixed in
AS, generating frequencies that are equal to the sum and
difference of the two input signals. The sum and difference
frequencies appear across the primary winding of T2. The
carrier has been suppressed ty 50 db or more,
The double sideband, suppressed carrier signal is then
coupled from the secondary winding of T2 to the crystal
filter, which suppresses the unwanted sideband, and per-
mits only the selected sideband to be fed to the First IF
Amplifier, V7. The carrier frequency is generated at ap-
proximately 5500.0 KHz, normal sideband. With opposite
sideband, the carrier crystal frequency will be 5503.3 KHz,
and this positions the double sideband signal on the other
side of the filter response curve, attenuating the unwanted
sideband by at least 50 db. In the single conversion mixing
process, these sidebands become inverted on &) and 40
meters. Thus, the Swan 350A and 3501) normally operate on
lower sideband on 80 and 40 meters, while on 20, 15 and 10
meters, normal operation is on upper sideband.
Q1, the 40673 VFO Oscillator, is connected as a Colpitts
oscillator with Q2, Q3 and V1 operating as buffers to isolate
the oscillator from the load. A7 provides excellent regulation
of the +8V supply which contributes to the stability of the
VFO frequency.
Bandswitching of the VFO is accomplished by changing the
VFO tank circuit coil. The VFO exhibits extremely good
stability after the initial warm-up period. Drift from a cold
start will be less than 1 KHz for the first hour on 80, 40 and
90 meters and less than 2 KHz on 10 and 15 meters. After
initial warm-up, drift wili be negligible
The single sideband, supressed carrier signal from the first
IF amplifier is fed to the Transmitter Mixer, V2, where it is
subtractively mixed with the output of the VFO Amplifier,
Vi, on 40 and 80 meters. On 20, 15 and 10 meters, the
frequencies are additively mixed. Therefore, the output of
the Transmitter Mixer is LSB on 80 and 40 meters and USB
on 20, 15 and 10 meters. The output of the Transmitting
Mixer is amplified by the Driver, V3, and the Power Am-
plifier, V4.
When in TRANSMIT, the gain of the First IF Amplifier is
controlled through the Automatic Level Control network
(using the AGC Amplifier V12) to control the gain of the
stage in response to the average input power to the Power
Amplifier. This ALC system will compensate for any ex-
tremely strong input signals, but does not completely
eliminate the necessity of proper adjustment of the Mic.
Gain Control, The ALC feature will help prevent flat topping
and generation of spurious emissions, but considerable
distortion may occur if the Mic. Gain Control is not properly
adjusted. Refer to Operating Instructions.
TUNE AND CW OPERATION
Normally, the frequency of the carrier oscillator is ap-
proximately 300 Hz outside the 6 db passband of the crystal
lattice filter. In TUNE position, the frequency of the carrier
oscillator is moved approximately 800 Hz to place it well
within the passband of the crystal lattice filter. A similar
procedure is followed for CW to allow full carrier output
during CW operation.
CW FILTER
The CW Filter consists of A6-A, A6-B and associated
components connected as active filters. In the 100 Hz
position of the CW FILTER Switch, the output of V9-A is
passed through the circuit of A6-A which narrows the audio
passband to 700-900 Hz, The output of A8-A is then applied
to the input of the audio amplifier. When the switch is in the
80 Hz position the output of A6-A is passed through the
circuit of A6-B hefore being applied to the audio amplifier.
A6-B further narrows the passband to 720-880 Hz.
RECEIVE
In RECEIVE position, or at any time when the transmitter
is not in TRANSMIT, all eircuits used in transmit only are
disabled through relay RY]. The relay is energized for
transmitting and de-energized for receiving. One contact,
when de-energized, allows signals from the transmitting
tank circuit and antenna to he fed to the Receiver EF
Amplifier, V5, where they are amplified and then fed to the
control grid of the Receiver Mixer, V6. The local osciltator
signal from the VFO Amplifier is now used to heterodvne
the received signal to the IF frequency. All IF amplification
is accomplished at this frequency, nominally 5500.0 KHz,
through V7 and V8 IF amplifiers. In the Product Detector,
VIA, the IF signal is heterodyned with the carrier
frequency generated by Carrier Oscillator, Q4. The
resultant audio is then amplified by V9B, whieh then couples
to V12, the AGC amplifier, and V10, the output audio stage,
FREQUENCY CALIBRATION
Frequency calibration of the Model 350A is in 5 KHz т-
crements on 80, 40, 20 and 15 meters, and in 20 KHz in.
crements on 10 meters. Dial accuracy and tracking are very
good on the 350A, but caution must always be observed
when operating near band edges. Measuring the frequency
with the crystal calihrator when working near band edges is
recommended.
11
DIAL SET (MODEL 350A ONLY)
A dial-set has been provided so that dial adjustment can be
made on any point of the dial. With the calihrator on, set the
dial to the 25 KHz point ¢losest to the frequency you wish to
work. Now adjust the dial-set control to zero-beat the VFO
with the crystal calibrator. This provides greater accuracy
of dial readout.
CAUTION
Care must be exercised when tuning for the
calibrator signals. The odd 100 KHz harmonies will
be strongest. The even 100 KHz, and all 75 KHz,
50 KHz and 25 KHz harmonics will be consider-
ably weaker,
The internal crystal calibrator has a 10 MHz crystal
oscillator that is applied to a frequency divider. The divider
has 100 KHz, 50 KHz and 25 KHz outputs that are all
summed and applied, through a small coupling capacitor, to
the input of the receive RF amplifier. Since these signals
are, essentially, square waves, they are rich in harmonics
and provide calibration signals throughout the tuning range
of the receiver.
TRANSMIT AND RECEIVE SWITCHING
Transmit and receive switching is performed by relay RYL.
In the TRANSMIT position, only those tubes that operate in
the transmit mode are operative. In the RECEIVE position,
the tubes that are used only in {transmit are cut off. Relay
RY1, when de-energized, feeds signals from the output pi-
network to the receiver, and is used also to control external
switching circuits. In transmit, the meter indicates the
cathode current of the P.A. when the meter switch is in the
P.A. CATH position or relative output from the P.A. when
in the S-METER position. In receive, with the switch in the
S-METER position, the meter indicates the voltage across
R126 in the screen circuit of the first IF amplifier, V7, which
is inversely proportional to the AGC voltage used to control
the gain of the tube. Thus, the meter indicates the relative
strength of the received signals,
POWER RATING
The Swan 350A and 350D are capable of over 200 watts,
PEP input under steady-state, two-tone conditions. The
peak envelope power, when voice modulated, is con-
siderably greater, typicaliy 300 watts or more.
The built-in power supply produces no-load plate voltage of
approximately 800 voits. Under TUNE conditions, or CW
operation, this will drop to approximately 680 volts, and the
maximum input power will be reduced accordingly. Under
voice modulation, because average power is considerably
less, the power amplifier plate and screen voltages will be
maintained higher, even during voice peaks, by the power
supply filter capacitors. Under typical operating conditions,
peak plate current, before flat topping, will be 375 ma at 804
volts, to result in an input of 300 watts, P.E.P. Readings of
ANT
Al 1/2414 1/2 14
ET EE TRANSMIT POWER
CRIVER M
1.F. FILTER EE дин AMPLIFIER -— MIXER -— ! AMPUFIER ==
|
мт vo Ya NETWORK
Ya
| A
VFO
no
AGC ALC
AMPLIFIER
A0
BALANCED AUDIO MICROPHONE
MODULATOR — === AMPLIFIER m= AMPLIFIER MC
CARRIER
OSCILLATOR
Gé
Figure 3. Block Diagram, Model 350A/350D in Transmit Mode.
ANT
RF 1STLF | INDIF
NETWORK — AME on — M A | AMER ER FILTER —— ME ER
УРО
01-02-41
A
AGC AUDIO PRODUCT
AMPLIFIER Е AMPLIFIER = DETECTOR
v1? Y9-B VTA
y
AUDIO POWER CARAER
AMPLIFIER DECILLATOR
VIO IM
Figure 4. Block Diagram, Mode] 350A/350D in Receive Mode.
cathode current will not reflect this power input, however.
Because of the damping in the cathode current meter,
cathode current readings under normal voice input should
not average more than 110 to 130 ma.
POWER AMPLIFIER PLATE DISSIPATION
There is often a misunderstanding about the plate
dissipation of tubes operated as AB1 amplifiers under voice
modulation. In the Swan 350A and 350D, while in transmit
and with no modulation, the plate voltage will be ap-
12
proximately 750 volts, the plate current 40 ma, and the
power input will be 30 watts.
Authorities agree that the average voice power is 10 to 20 db
below peak voice power. Normally, some peak clipping in
the power amplifier can be tolerated, and a peak-to-average
ratio of only 6 db may sometimes occur. Under such con-
ditions, the average dissipation will be approximately 35
watts. The 6MJ6 is rated at 40 watts, continuous duty cycle.
Thus, it can be seen that under normal operating conditions,
the power amplifier tube in the Swan 3504 and 350D is not
PASSBAND
CENTER FREQUENCY
—4 KHZ -2 KHZ 0 +?KHZ +4 KHZ
0
6 db 37KH2
ICAL
SELECTIVITY
20 de CURVE
40 db
50 db 46 KHZ
SHAPE FACTOR 1
ULTIMATE REJECTION
GREATER THAN 100 08
190 db B3KHZ
Figure 5. IF Filter Response Characteristics.
being driven very hard. Note, however, that proper
modulation level must be maintained by correct setting of
Mic. Gain, and that the length of time in TUNE position
must be limited to not more than 30 seconds at a time.
ALIGNMENT AND TROUBLESHOOTING
The alignment procedures presented in this section are
routine touch-up procedures for all tuned circuits and other
adjustments. It is recommended that the procedures be
performed in the order presented. However, if complete
realignment is not required {as may be the case when just
one tube is replaced), perform just those procedures
required. Refer to Figures 6 and 7 for component placement.
RECEIVER ALIGNMENT
Receiver alignment invelves only the adjustment of the
Second IF coil. The RF coils which effect receiver per-
formance are also used in the transmit mode. Their ad-
justment is covered under Transmitter Alignment.
1. After allowing approximately five minutes for warm-up,
tune the receiver to the middle of any band and at a
“clear” frequency.
2. Adjust the P.A. TUNE, P.A. LOAD, and DRIVER
front pane] controls for maximum background noise.
3. Adjust IF coil L23 for maximum background noise,
13
S-METER ADJUSTMENT
With antenna disconnected, RF Gain fully clockwise and the
Meter switch in the S-METER position, set R123, located on
rear panel, for zero meter reading. Make sure no local
signals are being received.
TRANSMITTER ALIGNMENT
1. Power Amplifier Bias.
a. Switch meter to P.A. CATHODE.
b. After allowing approximately five minutes for warm-up,
key the transmitter with the microphone switch.
Without speaking into the microphone, adjust the CAR.
BAL. control, R98, for a minimum power amplifier
cathode current.
¢. Again key the transmitter with the microphone switch,
and without speaking into the microphone, adjust the
P.A. BIAS control, R31, on the rear panel for the delta
symbol on the meter, corresponding to 40 ma idling
current.
2. Transmitter Circuits
The alignment of transmitter circuits involves the ad-
justment of tuned circuits in the VFQ Amplifier, V1, the
Transmit Mixer, V2, and Driver stage, V3, It is recom-
mended that a dummy load be connected to the antenna jack
during this series of adjustments.
a. Start first by adjusting the 40 meter band. Set tuning
dial and driver control as indicated by Table 3, Page 16.
bh. Set P.A. LOAD control to 9 o'clock,
¢. Press Mic. Button, Check idling current. It should be on
the delta symbol with CAR. BAL. control nulled.
Adjust P. A. BIAS control, if required.
d. With Mic. Button pressed, adjust CAR. BAL. control
for slight increase in meter reading, 50 to 60 ma. Adjust
P.A. TUNE to resonance, (dip).
e. Adjust coils as indicated by alignment chart for
maximum meter reading. When reading goes higher
than 80 ma, adjust CAR. BAL. for 60 ma. again.
f. Adjust coils carefully for maximum peak. Exercise
caution with CAR. BAL. control. Do not exceed 10{ ma
reading for more than a few seconds. Be sure P.A.
TUNE control is resonated (adjusted for “dip” in meter
reading).
g. Switch to 80 meter band, and repeat steps ia) through
if}, following the tuning chart carefully. Follow this
procedure through for each band.
3. Power Amplifier Neutralization
Perform the power amplifier neutralization adjustment on
20 meters and in the following manner.
a. After allowing approximately five minutes for warm-up,
tune the transmitter to approximately 14.250 MHz,
b. Position the P.A. LOAD control to the 9 o'clock position
{full counter clockwisej.
e. Set meter switch to P.A. CATHODE.
d. Key the transmitter with the mjcropbone switch, and
without speaking into the microphone, adjust the CAR.
BAL. control for a power amplifier current of ap-
proximately 10¢ ma. Adjust tbe DRIVER control for
peak. Quickly adjust CAR. BAL. to 100 ma. again if it
increased to a higber reading.
e. With the Mic. Button still pressed, rotate the P.A.
TUNE contro] through its range from 9 o'clock to 3
o'clock. You will note a pronounced “dip” in meter
reading at resonance. Qbaerve any tendency for the
meter to “peak” above the 100 ma. plateau on esther
side of resonance. If there is a such a peak, adjust C55,
tbe P.A. Neutralizing trimmer, to suppress the peak.
When properly neutralized, the meter reading will hold
steadily al 100 ma. except for the sharp dip at
resonance, but there should be very little, if any, rise
above the 100 ma. level.
f. Key the transmitter with the microphone switch and
readjust the CAR. BAL. control for minimum power
amplifier current. Power amplifier idling current should
be on the delta symbol. If not, repeat the power am-
plifier hias adjustment described on Page 13.
4. Carrier Frequency Adjustment
A dummy load, wattmeter and audio generator are required
for this adjustment.
a. After allowing a five-minute warm-up period, tune the
transmitter to approximately 14.250 MHz,
b. Key the transmitter with the microphone switch and
adjust the CAR. BAL. control for minimum power
amplifier current.
c. Insert 1500 Hz of audio from an audio generator into the
Mic. Jack located on the front panel. Adjust the gain of
the audio generator and the Mic. Gain control (R87)
until the wattmeter reads between 10 and 15 watts.
d. Adjust the first IF coil (L22] for maximum output.
Adjust both slugs of the balanced modulator trans-
former (T2) for maximum output.
e, Increase output of audio oscillator until wattmeter reads
40 watts. Sweep generator down to 300 Hz and adjust
the Normal Sideband carrier oscillator trimmer (C140)
for a wattmeter reading of 10 watts.
f. Switch to Opposite Sideband. Adjust the Opposiite
Sideband carrier oscillator trimmer (C142) for a reading
of 10 watts,
g. Recheck with audio generator set at 1500 Hz and output
at 40 watts. Sweep down to 300 Hz and readjust, if
required, for 10 watts.
h. Reduce the audio generator output to zero. Insert an in-
line "T” voltage divider in the antenna lead and connect
a frequency counter to its low level output. Adjust the
carrier balance control for an output that produces a
stable reading on the counter.
i. Tune the transceiver to 14.000000 MHz as indicated on
the counter. Set the Mode switch to CW and adjust the
CW offset control for a counter reading of 14.000800
MHz.
5. Carrier Balance Adjustment
Several times, during ibe preceding adjustments, the CAR
BAL control bas been adjusted for varying reasons. Be sure
that this control is always re-set for exact null before
operating.
6. Balanced Modulator Gain Adjustment
The halanced modulator circuit board in the Mode] HOA
and 350D is used in otber Swan transceivers where a
balanced modulator gain adjustment is required. In the
350A and 350D, bowever, the balanced modulator gain
control is always set at its maximum clockwise position.
VFO CALIBRATION
1. After allowing approximately five minutes for warm-up,
put tbe DIAL SET control at the “12 o'clock” position
and tune tbe receiver near 3800 KHz. Using a frequency
standard, or the 100 KHz erystal calibrator as an ac-
curate signal source, tune the signal for zero beat and
note the corresponding dial reading. If the 3800 KHz
signal does not zero beat at 3800 on the dial, adjust the
80 Meter trimmer until it does.
2. In a similar manner, check each of the other bands in
the normally used portion of the band. For example:
T200, 14.200 or 14,300, 21,300 or 21,400, 28.700 or
whichever portion of 10 meters is normally used. Âc-
curacy in other parts of the bands will be quite good,
but remember that the 350A 1s not to be considered a
frequency standard. Be cautious when operating near
hand edges. FCC regulations require that every
amateur radio station have a means available for
measuring its transmitting frequency.
If a frequency meter or frequency counter is available, the
information contained in Tahle 5 can be used to perform
direct VFO and Carrier Oscillator frequency measurements.
SIDETONE ADJUSTMENTS
CARRIER OSCILLATOR PEAKING
1. Place the Mode switch in the CW position, Adjust the
1, Connect an RF voltmeter to the junction of C137 and
Sidetone Level control for the desired sidetone level R103 on the balanced modulator board and adjust the
from the speaker.
carrier oscillator coil for a maximum reading on the
voltmeter,
2. Adjust the Sidetone Pitch control (R128) for an 800 Hz
tone from the speaker.
Table 3. Transmitter Alignment Chart.
BAND DRIVER SETTING TUNING DIAL ADJUST COILS
40 Meters 12 O'Clock 7180 KHz LS, L11-À, L14-À
80 Meters 12 O'clock 3790 KHz L10, L13
20 Meters 12 O'clock 14205 KHz L11-B,L14-B
15 Meters 12:30 O'Clock 21270 KHz L7, L12-À, L15-À
10 Meters 12:30 O'clock 28920 KHz LS, L12-R, L15-B
Note:Adjust 40 Meter Band First.
Table 4. Toubleshooting Chart.
SYMPTOM
POSSIBLE CAUSE
PA Idling Current Unstable
Inability to Load Per Operating
Instructions
Insufficient Sideband Suppression | 1. Carrier Oscillator {Q3} operating on incorrect [requency.
2, Crystal filter defective or mistuned.
Insufficient Carrer Suppression
Microphonics in Transmitter
Low Receiver Sensitivity
o o ES Do — > CO PO == C8 BD 4
d= C5 БО =
. Tube V11 defective.
. IF coil L22 defective or incorrectly adjusted,
. Microphone defective.
. Delective Power Amplifier Tube, V4,
. Defective Bias control and/or associated components.
. Defective bias supply
. Antenna not resonant at operating [requency.
. Defectjve transmission line.
. Delective antenna loading coil(s),
. Tube V1, V2, V3 or V4 delective.
. Balanced Modulator, A3, defective.
. Transformer T2 defectiye or Mistuned.
. Carrier Oscillator (Q3) operating on incorrect frequency,
. Tube V5, V6, V7, V8, VO or V10 defective.
. Incorrect adjustment of the transmitter Pi-Network.
. IF сот! L23 incorrectly adjusted or defective.
. RY1 contacts defective.
Table 5. VFO and Carrier Oscillator Frequencies.
vi Ql Qs
TUNING DIAL | INJECTION FREQ. VFO FREQ. CARRIER OSC. FREQ.
3,500 KHz 9.000 KHz 9,000 KHz 5,500 KHz
4,400 KHz 9,500 KHz 9,500 KHz 5,500 KHz
7,000 KHz 12,500 KHz (1/2) 6,250 KHz 5,500 KHz
7,300 KHz 12,800 KHz (1/2) 6,400 KHz 5,500 KHz
14,000 KHz 8,500 KHz 8,500 KHz 5,500 KHz
14,350 KHz 8,850 KHz 8,850 KHz 5,500 KHz
21,000 KHz 15,500 KHz (1/2) 7,750 KHz 5,500 KHz
21,450 KHz 15,590 KHz (1/2) 7,975 KH: 5,500 KHz
28,000 KHz 22 500 KHz (1/2) 11,250 KHz 5,500 KHz
29,700 KHz 24,200 KHz (1/2) 12,100 KHz 5,500 KHz
16
Table 6. Voltage Chart.
3 4 5 6 7 8 9
Vi 0 0 0 12V AC +170 + 59 0 N/A N/A
12BA6 0 0 0 12VAC + 152 +53 0 N/A N/A
VFO Amp
V2 —2 0 0 12VAC + 228 —2 0 N/A N/A
12BE6 —2 0 0 12VAC + 216 + 123 0 N/A N/A
Xmit Mix.
Ya 0 —6 0 0 6VAC N/C + 280 0
6GK6 0 —6 0 0 6VAC N/C + 230 0
Driver
Va 0. —55 0 SVAC 12V AC —55 N/C 0 N/C
6MJ6 +188 —55 0 6VAC 12VAC —55 N/C 0 N/C
Pwr. Amp.
V5 —1 0 6VAC О + 228 + 99 0 N/A N/A
6CB6 —1 0 6VAC 0 + 217 —4 0 N/A N/A
R.F. Amp.
V6 —2 0 0 12VAC + 254 +99 —1 N/A N/A
12BE6 —2 0 0 12VAC + 226 —4 —1 N/A N/A
Rec. Mix.
Ут — 2 O. 0 12VAC + 200 +118 0 N/A N/A
12BAS —1 0 0 12VAC +179 + 106 0 N/A N/A
1st IF
VE —1 0 0 12VAC +20 + 98 0 N/A N/A
12BA6 —% 0 0 12VAC | O —4 0 N/A - N/A
2nd IF
va + 48 0 0 12VAC 1 0 + 137 —1 0 N/C
12AX7 —1 0 0 12VAC 10 0 —1 0 NC
Rec. Aud,
V10 0 +2 + 209 0 6VAC + 250 +7 0 + 142
6G W8 0 +6 + 186 0 SVAC +224 +6 0 + 185
Aud. Pwr.
vil +6.5 0 0 0 12VAC 0 0 0 N/C
12AX7 +63 0 0 0 12VAC 4 88 0 +1 МС
Mic. Amp.
METER: VTVM or DVM with 10 megohm input impedance,
RECEIVE TEST CONDITIONS: A.F. GAIN —12 O'ciock, R.F. GAIN —Full CW, SIDEBAND _ NORM.
MODE Switch —REC. CW FILTER — OFF. TUNING DIAL —14.300 MHz.
No Input Signal. S-METER at zero.
TRANSMIT TEST CONDITIONS: SIDEBRAND—NORM. MODE Switch— REC, CW FILTER—OFF.
CAR. BAL.—12 O'Clock. MIC GAIN — Fui) CCW, P.A. BIAS— À ,
Set Keyed with PTT switeh on mike, no modulation.
(Continued)
17
ra mia IE A
Table 6, Voltage Chart (Continued).
E B С Gl G2 5 D
Q4 R +4.5 +4.5 +7.8 Q2 R +1.8 N/A +3.7 +7.5
MPS-H10 |T +4.5 + 4.5 +7.8 2N5670 T +1.8 N/A +3.7 + 7.0
Car. Osc. VFO Buff.
Q3 R +3 +1.1 +7.3 Ql R 0 +3.9 + 0,4 +7.8
MPS-H10 |T +3 +1.1 +7.3 40673 T 0 +3.9 +0.4 +7.8
VFO Qut. VFO
Q5 R —1.4 —2.0 — 7.6
2N5355 T —1.4 —2.0 — 7.6
Sidetone iTune) —.14 —1.7 —7.2
1 2 3 4 5 6 T 8 9 10 11 12 13 14
A6 R +3.9 | +35] +350 +85 | +35] +37] +6.8
MC1458 T +3.9 | +3.5 | +3.5 |0 +35 +35] +3.7! +6.8
CW Filter
AS R —6.2 | —6.9| —6.9 | —6.2 —10.8/0 0 0 0 0 0 —0.8 | O —12
MC1496 T —6.2 | —6.9| —6.9 | — 6.2 |--10.8| + 6.8 10 0 0 0 0 +6.8 | 0 —12
Bal. Mod.
Al OFF | 0 +40 +4.0 | +1.3|+1.3 | +1.1|0 +30] +11 | +1.1 10 +4.9 | +4.9| 15.0
7400 ON | +4.1| +1.1| +1.11 +15/+1.51+1.1 10 £1.7|+1.1|+1.1|+4.5 10 0 +5.0
Cal. Gate
A? OFF | +3.0 | Ô 0 0 +5.0 10 0 0 0 0 +0.1 | +0.1 0 +01
7490 ON | +1.7 [0 0 0 + 5.0 |0 0 +1.7 | +1.6 10 +0.8 | + 2.1 |0 + 0.8
Cal. Div.
АЗ OFF | + 0.110 0 0 +5 0 0 + 4.1 | +0.1 0 + 4.0 | +0.1 10 + 4.0
7490 ON | +2.1 |0 0 0 +5 |0 0 +1.8 | +1.7 10 +1.0|+2.1 0 +4.0
Cal. Div.
Ad OFF | +1 +4.0(0 +1.4 |+ 4.0 | +2.1 |0 +2.0 |0 +1.4 10 + 4.0 | +1.4 | 45.0
7474 ON | 41.5| +2.1| +2.1j +1.4j+2.0 [| 42.110 +2.0 | +2.0 | +1.4 | +2.1 +2.0 | +1.4 |'+5.0
Cal. F/F
148
LU
Fri
LEVEL Hi 1 Er 5
Hi:
PITCH
Wi
La
Tin
ui
id
Ti
Cla vi
LTE
Figure Él Tap Vies of ERA FILA Cover Hereoved Ebcaring Adjpsimerss
umi Tola paco Sod] A ELE Y A ee [amily
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#1 AM HOTEL HEMT BERT
PARTS LIST
Table 7. Replaceable Parts List.
С
jm
288909288
В
HEE EEE HEE RHEE YENRE
CAPACITORS
5 pid.
120 pid., DM-15, Silver Mica
3-30 pfd., Ceramic Trimmer
0.1 ufd., 50V, Ceramic Disc
0.01 ufd, 100V, Ceramic Disc
0.1 ufd., 12V, Ceramic Disc
Not a Physical Capacitor
Factory Selected
Factory Selected
0.01 ufd., 100Y, Ceramic Disc
1.2-4.2 ptd., Trimmer
Factory Selected
1.5-9.1 pid., Air Dielectric
Trimmer
Factory Selected
1.8-16.7 pid.. Air Dielectric
Trimmer
Factory Selected
1.8-16.7 pid., Air Dielectric
Trimmer
Factory Selected
1.8-16.7 pid., Air Dielectric
Trimmer
Factory Selected
4.5-11.5 pfd., Air Dielectric
Trimmer
2 pid., Miniature Air Dielectric
Trimmer
0.01 ufd., 100V, Ceramic Disc
Factory Selected
91 pfd., DM-15, Silver Mica
91 pid., DM-15, Silver Mica
2 pid., NPO
0.01 ufd., 100V, Ceramic Disc
0.01 ufd., 100Y, Ceramic Disc
0.01 ufd., 100V, Ceramic Disc
0.01 ufd.. 500Y, Ceramic Disc
Factory Selected
100 pfd., NPO
0.002 ufd., 500V, Ceramic Disc
Factory Selected
0.01 ufd., 500V, Ceramic Disc
20 pid., NPO
39 pid., N220
0.002 ufd., 500V, Ceramic Dise
50 pid., Air Dielectric Trimmer
39 pid., NPO Disc
150 pfd., N1500 Disc
0.01 ufd., 500V, Ceramic Disc
0.05 ufd., 500V, Ceramic Disc
0.002 ufd., 500V, Ceramic Disc
470 pid., DM-19, Silver Mica
1 pfd., 10%, Type QC
BUEN ES SESQUSSSS
3.3 pid., 10%, Type QC
270 pid., DM-15, Silver Mica
50 pfd., Air Dielectric Trimmer
150 pid. , N1500, Disc
39 pfd., NPO, Disc
0.002 ufd., 50V, Ceramic Disc
510 pfd., DM-19, Silver Mica
20 ptd., Air Dielectric Trimmer
3.3 ptd., 10%, Type QC
0.002 ufd., 500Y, Ceramic Disc
0.001 ufd., 500Y, Ceramic Disc
0.002 utd., 500Y, Ceramic Disc
100 píd., 6KV, Ceramic Disc
0.002 ufd., 2KV, Ceramic Disc
2 x 180 pfd., Air Dielectric
Trimmer
0.01 ufd., 500V, Ceramic Disc
0.01 ufd.. 500V, Ceramic Disc
100 píd., 5KY, Ceramic Disc
100 pfd., 6KV, Ceramic Disc
0.002 ufd., 2KV, Ceramic Disc
2 x 410 pfd., Air Dielectric
Trimmer
510 pid.. DM-19, Silver Mica
510 pfd., DM-19, Silver Mica
100 pid., DM-19, Silver Mica
0.01 ufd., 500V, Ceramic Disc
80/80/5/5 ufd., 400 WVDC,
Electrolytic
0.01 ufd., 500V, Ceramic Disc
0.01 ufd., 500V, Ceramic Disc
30 nîd., N1500, 1KV,
Ceramic Disc
430 pid., DM-19, Silver Mica
0.01 ufd., 500V, Ceramic Disc
220 píd., DM-15, Silver Mica
82 pid.. DM-15, Silver Mica
0.01 uid., 500V, Ceramic Disc
0.01 ufd., 500V, Ceramic Disc
60 pfd., N330, Ceramic Disc
2 pfd.. NPO, Ceramic Disc
0.01 uid., 500V, Ceramic Disc
0.01 ufd., 500Y, Ceramic Disc
0.01 ufd., 500V, Ceramic Disc
2ufd., 450 WVDC, Electrolytic
0.01 ufd., 500V, Ceramic Disc
50 pid.,N330,
Ceramic Dise
0.01 ufd., 500V, Ceramic Disc
50 pid., N330,
Ceramic Disc
2 ufd., 450 WVDC, Electrolytic
220 pfd., Ceramic Disc
0,002 ufd., 50Y, Ceramic Disc
150 pid., N2200, Ceramic Disc
C100
C101
C102
C104
C105
C106
C107
C106
C109
C110
C111
C112
C113
C114
C115
C116
C117
C113
C119
C120
C121
(C122
C123
(C124
C125
C126
C127
C128
C129
C130
Ci31
C132
C133
C134
C135
C136
C137
C138
C139
C140
C141
C142
C143
C144
C145
C148
1000 pid.. 2%, DM-15
Silver Mica
0.001 ufd.
33 ufd., 25V, Electrolytic
100 ufd., 25V, Electrolytic
1000 pid. , 2%, DM-15,
Silver Mica
0.001 ufd., 500Y, Ceramic Disc
0.002 ufd., 500V, Ceramic Disc
0.002 ufd., 500V, Ceramic Disc
500 pfd., 500V, Ceramic Disc
220 pid., 500V, Ceramic Disc
0.002 ufd., 500V, Ceramic Disc
20 ufd., 30 WVDC, Electrolytic
0.01 ufd., 1000V, Paper
2 ufd., 450 WVDC, Electrolytic
0.01 ufd., 150V, Ceramic Disc
1000 ufd.. 25 WVYDC, Electrolytic
0.1 ufd., 50V, Ceramic Disc
0.0047 ufd., 1400V AC,
Ceramic Dise
0.0047 ufd., 1400V AC,
Ceramic Disc
10 ufd., 25 WVDC, Electrolytie
100 ufd., 350 WVDC, Electrolyic
100 ufd,, 350 WVDC, Electrolytic
150 ufd., 150 WVDC, Electrolytic
150 ufd., 150 WVDC, Electrolytic
0.002 ufd., 2KV, Ceramic Disc
150 utd., 150 WVDC, Electrolytic
0.01 ufd., 500V, Ceramic Disc
0.01 ufd., 50Y, Ceramic Dise
100 píd., N1500, Ceramic Disc
0.1 ufd., 400V, Molded Paper
0.01 ufd., 500V, Ceramic Disc
0.1 vid., 400V, Molded Paper
0.01 ufd., 500Y, Ceramic Dise
0.01 ufd., 590V, Ceramic Disc
47 utd.
0.001 ufd., 500V, Ceramic Disc
0.001 ufd., 590V, Ceramic Disc
0.001 ufd., 500Y, Ceramic Disc
0.001 ufd., 500Y, Ceramic Disc
0.001 utd., 50 Y, Ceramic Disc
0.001 ufd., 500Y, Ceramic Disc
0.001 utd., 500Y, Ceramic Disc
100 pfd., N1500, Ceramic Disc
5-30 pfd., Ceramic Trimmer
7-60 pfd., Mica Compression
Trimmer
5-30 pfd., Ceramic Trimmer
0.1 ufd., 12V, Ceramic Disc
270 ptd., DM-15, Silver Mica
270 pid., DM-15, Silver Mica
1400 pfd., DM-19, Silver Mica
(Continued)
21
Table 7. (Continued)
C147
C148
C149
C150
C151
C152
C153
C154
C155
C157
C158
0.01 ufd., 500V, Ceramic Disc
0.047 uid., 200V, Molded Paper
0.047 uid., 200V, Molded Paper
1 ufd., 50 WVDC, Electrolytic
0.01 uid., 500V, Ceramic Disc
0.01 ufd., 500V, Ceramic Disc
0.01 ufd., 500V, Ceramic Disc
0.01 ufd., 500V, Ceramic Disc
10 utd., 25 WYDC, Electrolytic
0.01 ufd., 100V, Ceramic Disc
0.1 ufd., 12V, Ceramic Disc
0.1 ufd., 12V, Ceramic Disc
DIODES
1N914
1N4005
1N914
1N4005
ZBC-12
1N4742
1N914
1N914
1N914
1N914
1N4005
RESISTORS
1.5K Ohms, 1/4 Watt, 5%
1.5K Ohms, 1/4 Watt, 5%
2 2K Ohms, 1/4 Watt, 5%
470K Ohms, 1/4 Watt, 5%
4.7K Ohms, 1/4 Watt, 5%
4.7K Ohms, 1/4 Watt, 5%
100 Ohms, 1/4 Watt, 5%
330 Ohms, 1/4 Watt, 5%
330K Ohms, 1/4 Watt, 5%
100K Ohms, 1/4 Watt, 5%
100 Ohms, 1/4 Watt, 5%
1K Ohms, 1/4 Watt, 5%
47 Ohms, 1/4 Watt, 5%
15K Ohms, 1/4 Watt, 5%
3.3K Ohms, 1/4 Watt, 59
27 Ohms, 1/4 Watt, 5%
1.7K Ohms, 1/2 Watt, 10%
82 Ohms, 1/2 Watt, 10%
4.7K Ohms, 1/2 Watt, 10%
2.7K Ohms, 1/2 Watt, 10%
56 Ohms, 1/2 Watt, 10%
47K Ohms, 1/2 Watt, 10%
10K Ohms, 2 Watt, 10%
27K Ohms, 1/2 Watt, 10%
100K Ohms, 1/2 Watt, 10%
100K Ohms, 1/2 Watt, 10%
2.7K Ohms, 1 Watt, 10%
R48
R79
100K Ohms, 1/2 Watt, 10%
100K Ohms, 1/2 Watt, 10%
100 Ohms, 1/2 Watt, 10%
25K Ohms, A Taper,
Potentiometer
15K Ohms, 1/2 Watt, 10%
4.7K Ohms, 1/2 Watt, 10%
1K Ohms, 1/2 Watt, 10%
0.47 Ohm, 2 Watt, 5%
100 Ohms, 10 Watt, 10%
100 Ohms, 1/2 Watt, 10%
170K Ohms, 1/2 Watt, 10%
10K Ohms, 2 Watt, 10%
470K Ohms, 1/2 Watt, 10%
10K Ohms, 2 Watt, 10%
100K Ohms, 1/2 Watt, 10%
1K Ohms, 1/2 Watt, 10%
470K Ohms, 1/2 Watt, 10%
330 Ohms, 1/2 Watt, 10%
680 Ohms, 1/2 Watt, 10%
100K Ohms, 1/2 Watt, 10%
1K Ohms, 1/2 Watt, 10%
100K Ohms, 1/2 Watt, 10%
1K Ohms, 1/2 Watt, 10%
4.7K Ohms, 1/2 Watt, 10%
10K Ohms, 1/2 Watt, 10%
47K Ohms, 1/2 Watt, 10%
270 Ohms, 172 Watt, 10%
270K Ohms, 1/2 Watt, 10%
910K Ohms, 1/4 Watt, 5%
22K Ohms, 1/4 Watt, 5%
1.8M Ohms, 1/4 Watt, 5%
1K Ohms, 1/4 Watt, 5%
1K Ohms, 1/4 Watt, 5%
220 Ohms, 1/4 Watt, 5%
910K Ohms, 1/4 Watt, 5%
22K Ohms, 1/4 Watt, 5%
1.8M Ohms, 1/4 Watt, 5%
47K Ohms, 1/2 Watt, 10%
1M Ohms, 1/2 Watt, 10%
10M Ohms, 1/2 Watt, 10%
100K Ohms, 1/2 Watt, 10%
1M Ohms, Composition, A Taper
Potentiometer with Switch
2.7K Ohms, 1/2 Watt, 10%
5.8K Ohms, 1 Watt, 10%
100K Ohms, 1/2 Watt, 10%
680 Ohms, 1/2 Watt, 10%
1M Ohms, 1/2 Watt, 10%
270 Ohms, 1/2 Watt, 10%
150K Ohms, 2 Watt, 10%
180K Ohms, 2 Watt, 10%
800 Ohms, 10 Watt, 10%
1.7K Ohms, 1/2 Watt, 10%
800 Ohms, 10 Watt, 10%
500 Ohms, 10 Watt, 10%
1.2K Ohms, 5 Watt, 10%
R95
R97
R98
R99
R100
R101
R102
R103
R104
R105
R106
R107
R108
R109
R110
R111
R112
R113
R114
R115
R116
R117
R118
R119
R120
R121
R122
R123
R124
R125
R126
R127
R128
R129
R130
R131
R132
R133
A7K Ohms, 1/2 Watt, 10%
2.2M Ohms, 1/2 Watt, 10%
470K Ohms, 1/2 Watt, 10%
270K Ohms, 1/2 Watt, 10%
1M Ohm, Compositon, A Taper
Potentiometer.
47K Ohms, 1/2 Watt, 10%
150K Ohms, 1/2 Watt, 10%
1K Ohms, 1/2 Watt, 10%
4.7K Ohms, 1/4 Watt, 5%
4.7K Ohms, 1/4 Watt, 5%
4.7K Ohms, 1/4 Watt, 5%
470 Ohms, 1/4 Watt, 5%
470 Ohms, 1/4 Watt, 5%
6.8K Ohms, 1/4 Watt, 5%
10K Ohms, 1/4 Watt, 5%
5K Ohms, Composition, Linear
Taper Potentiometer
10K Ohms, 1/4 Watt, 5%
5K Ohms, PC Mount
Potentiometer
680 Ohms, 1/4 Watt, 5%
4.7K Ohms, 1/4 Watt, 5%
6.8K Ohms, 1/4 Watt, 5%
27K Ohms, 2 Watt, 10%
4.7K Ohms, 1/4 Watt, 5%
47 Ohms, 1/2 Watt, 10%
4. TK Ohms, 1/2 Watt, 10%
6.8K Ohms, 1/2 Watt, 10%
1K Ohms, 1/2 Watt, 10%
15K Ohms, 1/2 Watt, 10%
ATK Ohms, 1/2 Watt, 10%
170K Ohms, 1/2 Watt, 10%
10K Ohms, 1/2 Watt, 10%
25K Ohms, Composition Linear
Taper Potentiometer
470 Ohms, 1/2 Watt, 10%
1M Ohms, 1/2 Watt, 10%
10M Ohms, 1/2 Watt, 10%
10K Ohms, 1/2 Watt, 10%
470K Ohms, 1/2 Watt, 10%
220K Ohms, 1/2 Watt, 10%
100K Ohms, 1/2 Watt, 10%
47K Ohms, 2 Watt, 10%
25K Ohms, Linear
Taper Potentiometer
15K Ohms, 1/2 Watt, 10%
150K Ohms, 1/2 Watt, 10%
33K Ohms, Z Watt, 1%
1K Ohms, 1/4 Watt, 59
25K Ohms, Linear Taper
PC Mount Potentiometer
10K Ohms, 1/4 Watt, 5%
15K Ohms, 1/4 Watt, 5%
69K Ohms, 1/4 Watt, 5%
470 Ohms, 1/4 Watt, 5%
2.2K Ohms, 1/4 Watt, 5%
(Continued)
22
Table 7. (Continued)
R134
R185
Q1
Q2
Q8
Q4
Q5
Al
AS
Ad
Ab
A6
А7
1,10
Lil
L12
L13
10K Ohms, Linear Taper
PC Mount Potentiometer
33K Ohms, 1/4 Watt, 5%
TRANSISTORS
40678
2N5670
MPS-H10
MPS-H10
2N5355
INTEGRATED CIRCUITS
7400
7490
7490
7474
78M05 Regulator
MCI458P2
18M08 Regulator
MC1498P
INDUCTORS
10 Meter Tuning Coil, VFO
15 Meter Tuning Coil, VFO
20 Meter Tuning Coil, VFO
40 Meter Tuning Coil, VFO
80 Meter Tuning Coil, VFO
47 uhy. Choke
15 Meter Tuning Coil, VFO Amp.
10 Meter Tuning Coil, VFO Amp.
80/40/20 Meter Tuning Coil,
VFO Amplifier
50 Meter Tuning Coil,
Transmit Mixer
40/20 Meter Tuning Coil,
Transmit Mixer
15/10 Meter Tuning Coil,
Transmit Mixer
80 Meter Tuning Coil, Driver
40/20 Meter Tuning Coil, Driver
15/10 Meter Tuning Coil, Driver
82 uhy. Choke
82 uhy. Choke
55 uhy. Choke
Pi-L Filter Tuning Coil
4 uhy. Torroid
30 uhy Choke
1st IF Tuning Coil
21d IF Tuning Coil
17 uhy. Choke
200 uhy. Choke
Carrier Oscillator Tuning Coil
200 uhy. Choke
TRANSFORMERS
Interstage Coupling Torroid, VFO
Balanced Modulator
Audio Qutput
Power
CRYSTALS
10 MHz, Series Resonant, HG-25/U
5500 KHz, Parallel Resonant,
32 pfd., HC-8/U
0003.8 KHz, Parallel Resonant,
32 pid., HC-6/U
TUBES
12BA6
12BE6
6GK6
6MJ6
6CB6
12BE6
12BA6
12BA6
12AX7
v10
\11
\12
J1
J2
J3
J3
J4
Jd
Pl
DS1
DS?
F1
Fe
FL1
M1
RY1
#1
5GW6
12AX7
6AV6
SWITCHES
Bandswitch
Power (Part of R69)
Slide, 2P3T, CW Filter
Rotary, Function
Slide, SPST, Meter
CONNECTORS
Miniature Phone Jack
RCA Type Phono Jack
12 Pin Jones Plug
Octal Socket
Closed Circuit, 1/4" Phone Jack
1/4" Microphone Jack
Closed Circuit, 1/4” Phone Jack
3 Terminal AC Plug
Part of Line Cord
12 Pin Jones Plug
MISCELLANEQUS
Dial Lamp, #1815
Dial Lamp, 12V, 40 MA., Miniature
Fuse, 4A, 250V, 3AG (117V Model)
Fuse, 2A, 250V, BAG (230V Model)
5500 KHz, 2.7 KHz, 6-Pole Crystal
Lattice Filter
0-500 Microampere Meter
Relay, 3PDT, 12V
Network, Parasitic Suppressor
El
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29/30
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