Hallicrafters_SX122 HF Reciever_Service Manual

Hallicrafters_SX122 HF Reciever_Service Manual
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hallicratfers
OPERATING AND SERVICE INSTRUCTIONS
FOUR-BAND
COMMUNICATIONS RECEIVER
MODEL SX-122
© 156-001 957
Figure |. Hollicrafters' Made! 5X-122 Receiver.
SECTION |
GENERAL DESCRIPTION
The Hallicrafters' Model SX-122 Communications
Receiver is a four-band dual-conversion super-
heterodyne receiver tuning from 540 to 1600
kilocycles (KC) and 1,75 to 34 megacycles (MC)
with calibrated electrical bandspread provided on
the 80, 40, 20, 15, 10 meter and citizens bans,
The frequency range covers foreign and domestic
short-wave broadcasts, amateurs, aircraft, and
marine plus standard AM broadcasts. The receiver
provides for the reception of code (CW), voice (AM),
and single-sideband (SSB) signals over its entire
tuning range, the upper or lower sideband being
readily selectable by means of a front-panei
control. This feature greatly simplifies tuning of
single-sideband signals,
The 5X-122 Receiver employs dual conversion on
all bands to obtain optimum image rejection,
À high order of selectivity 18 made possible by
the use of a 50-KC second-IF system with four
high-Q, permeability-tuned circuits. Receiver
selectivity is variable in three steps: 0.5 KC, 2.5
KC, and 5 KC at 6 DB down.
A tuned-RF stage assures maximum sensitivity
and a high signal-to-noise ratio for outstanding
reception of weak and distant signals. A manual
RF gain control prevents overloading by strong
signals. An antenna trimmer, adjustable from the
front panel, permits peaking of the RF stage to
compensate for loading effects of various antennas.
Outstanding frequency stability is achieved by the
use af: 1} ceramic trimmers and coil forms in
the first-conversion oscillator, 2) extensive tem-
pérature compensation, 3) voltage regulation of
oscillators, and 4) a crystal-controlled, second-
conversion oscillator.
Tuning is accomplished by a precision tuning
mechanism to insure close calibration and ac-
curate resettabitity. Smooth flywheel tuning af-
fords maximum traverse speed and operating
else,
Provisions have been incorporated to accept, as an
accessory, a 100-KC Crystal Calibrator, Model
BA-7. This crystal calibrator provides marker
signals at every 100 KC on the dial for checking
calibration accuracy.
An automatic series noise limiter circuit, control-
led by a switch on the front panel, reduces
interference from electrical equipment, ignition
noise, and other forms of pulse-type noise.
An S meter is used to indicate the accuracy of tuning
and the relative strength of received signals. The
meter is calibrated in S units from 1 to 9, and in
decibels above $9.
Provision has been made in the receiver for a
remote receive-standby control.
Audio output connections include terminals for a
3.Z-olm speaker. A front-panel jack is also
provided for using headphones and the speaker is
automatically silenced when the headphone plugis
inserted.
The receiver is designed to operate on 105 to
125 volt, 50/60 cycle, AC current,
SECTION II
INSTALLATION
2-1. UNPACKING.
After unpacking the receiver, examine it closely
for damage which may have occurred in transit.
Should any sign of damage be apparent, imme-
diately file a claim with the carrier stating the
extent of damage. Carefully check all shipping
labels and tags for instructions before removing
or destroying them.
2-2. LOCATION.
The receiver may be placed in any location that
will permit free air circulation through the ven-
tilation holes and openings in the cabinet. Avoid
excessively warm locations such as those near
radiators and heating vents. The external speaker
may be located in any convenient position, although
it is recommended that it not be placed on top
of the receiver for reasons of ventilation.
2-3. ANTENNAS,
The RF input of the receiver is designed for
operation from either a single-wire antenna, a
half-wave doublet, or other antenna with a trans-
mission-line impedance from 50 to 600 ohms. An-
tenna connections are made to a three-terminal
strip at the rear of the receiver marked Al, A2,
and GND . Mounting holes are also provided, adja-
cent to the antenna terminals, for installation ofan
AN type SO0-239 connector for coaxial-cable
installations.
A. SINGLE-WIRE ANTENNA
The simplestantenna thatwill provide satisfactory
results throughout the entire tuning range is a
conventional single-wire antenna. In most locali-
ties, good results can be obtained with just the
15-foot length of antenna wire supplied with the
receiver. (See figure 2.) Attach one end of the
wire to terminal Al, connect the jumper link be-
tween terminals A2 and GND, and then extend the
wire about the room in a convenient manner. If
the receiver is operated in a steel-constructed
building or where receiving conditions are excep-
tionally poor, an outside antenna, 50 to 100 feet
long, may be necessary, The outside antenna
should be erected as high as possible and kept
free from surrounding objects.
In some locations, reception may be improved by
connecting a ground wire (ordinary copper wire)
from terminal GND to a cold-water pipe or out-
side ground rod. While the use of an outside ground
rod installed in accordance with Insurance Under-
writer's Laboratories requirements is adequate
2.
ANTENNA WIRE
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LINK
156-001747
Figure 2. Single Wire Antenna Installation.
protection against lightning, it is strongly recom-
mended that an additional connection be made to
the nearest cold-water pipe to eliminate any
shock hazard.
В. HALF-WAVE DOUBLET ANTENNA
For top performance, especially onthe short-wave
bands, the use of a half-wave doublet or other type
of antenna employing a 50 to 600 ohm transmission
line is recommended. A typical doublet antenna
installation is shown in figure 3. The doublet an-
tenna should be cut to the proper length for the
most used frequency or band of frequencies. The
formula for determining the overall length in feet
of a doublet antenna is included in figure 3.
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Figure 3. Typical Doublet Antenna Installation.
The doublet antenna is directional and should be
erected with its entire length facing a desired
station for maximum signal pickup,
The doublet antenna may be fed with eithera bai-
anced or unbalanced transmission line. When a
balanced line suchas twin-lead or tunsted pair is used,
the line connects to terminals Al and A? and the
jumper link between AZ and GND 18 disconnected,
(See figure 3.) When using anunbalanced line such
as coaxial cable, the inner conductor connects to
terminal Al, the outer braid connects to terminal
A2, and the jumper link is connected between
terminals A2 and GND. Aground wire may improve
reception when using an unbalanced-type line.
The doublet antenna provides optimum perform-
ance only at or near the frequency for which 1t 15
cut, Therefore it may be desirable, for reception
nn frequencies remote from the antenna frequency,
to utilize the doublet antenna as a single-wire type,
This is accomplished by connecting the two trans-
mission-line leads together and connecting them to
terminal A]. The jumper link inthis case should be
connected between terminals A2 and GND,
In an installation where the receiver 1s used in
canjunction with à transmitter, it may be advanta-
geous to use the sane antenna for receiving as for
transmitting. This 15 especially true when a direc-
tional antenna 18 used, since the directive effects
and power gain of the transmitting antenna are the
same for receiving as for transmitting. Switching
the antenna from the transmitter to the receiver
may be accomplished with an antenna-changeover
relay or a knife switch connected in the antenna
leads,
For further information regarding antennas, refer
to the Radio Amateurs Handbook or the A,R.R.L. Ántenno
Book, both published by the American Radic Relay
League, West Hartford, Connecticut, U.S.A,
2-4. POWER SOURCE.
The receiver is designed to operate directly on
105 tu 125 voit, 50/60 cycle AC current. Insert the
power cord into any convenient AC power outletof
the proper rating. If in doubt about your power
source, contact your local power company before
connecting power to your receiver, The wrong
power source can cause serious damage.
2.5. SPEAKER.
A three-terminal strip, marked GND, STDBY, and
3.2SPKR, is provided atthe rear of the receiver for
connecting the external speaker that is required
with the receiver. (See figure 4,) Any permanent-
magnet speaker with a 3.2-ohm voice coil can be
used by simply connecting the two leads from the
speaker voice coil to the terminals marked
3.25PKR and GND.
Hallicrafters' Model R-4BA Speaker is designed
for use with this receiver and may be connected to
the terminals marked 3.25PKR and GND.
2-6. HEADPHONES.
The headphone jack, marked PHONES, is located on
the front panel of the receiver andis wired so that
the speaker is automatically silenced when the
headphones are plugged in. The headphone imped-
ance is not critical and any headphones ranging
from 50 chms to 5000 ohms will provide satis.
factory performance.
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Figure d. Rear View of Receiver,
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Figure 5. Remote Receive-Standby Circuitry.
2-7 REMOTE RECEIVE .STANDBY SWITCH.
The receiver may be disabled from a remote
location by connecting a remote SPST switch or
relay between the STDBY and GND terminals located
at the rear of the receiver. (See figure 5.) To
operate the receiver with the remote switch, the
jumper link must be removed, The switchor relay
should be so wired that the contacts will be closed
in Receive and open in Standby.
SECTION ti
FUNCTIONS OF OPERATING CONTROLS
3-1 GENERAL.
The controls discussed in this section are identi-
fied in figure 6, Before operating your receiver
take time to familiarize yourseif with these
controls, their positions on the panel, and their
functions.
3-2. RF GAIN.
The RF GAIN control varies the gain of the RF amp-
lifier and 50-KC IF amplifier stages. Maximum
Sensitivity is obtained with the control set at 10
{fully clockwise). In this position, the tubes being
controlled are operated at maximum gain with
minimum cathode bias. As the control is rotated
counterclockwise, the bias on the tubes increases
with a resultant decrease in gain.
3-3. BAND SELECTOR,
The BAND SELECTOR control operates the band
switch to place the proper set of coils into the cir-
cuit to cover the desired frequency range. The fre-
quency range covered by each position of the BAND
SELECTOR control is indicated directly on the panei,
3-4. ANTENNA TRIMMER.
The ANTENNA trimmer control operates a variable
capacitor connected across the secondary of the
antenna coil in use, This capacitor adjustment
compensates for the loading effects of various
types of antennas.
It should be noted that the ANTENNA trimmer peak
will appear broad as the receiver is tuned
towards the low-frequency end of the dial and may
not give a definite peak, Thisisanormal condition
and does not indicate improper alignment.
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Figure 6. Front Panel Controls.
3-5. AUDIO GAIN.
The AUDIO GAIN control adjusts the audio level at
the speaker terminals and PHONES jack. Clockwise
rotation of the control increases the signal
applied to the grid of the audio amplifier tube,
thus increasing receiver volume; counterclock-
wise rotation decreases volume.
3-6. NOISE LIMITER (ANL-OFF).
The ANL-OFF switch, when set at ANL, places the
automatic series noise limiter circuitin operation
to reduce pulse-type noise such as ignition noise
and electrical interference. The limiter circuit
allows the signal to pass unaffected through the
receiver, but makes the receiver inoperative for
noise amplitudes greater than those of the signal.
It will work on AM signals only and is self-
adjusting (i.e., itautomatically adjusts itself to the
signal level).
The noise limiter circuit chops noise peaks re-
ceived at the detector by means of a biased diode
which becomes non-conducting above a predeter-
mined signal level. When the limiter circuit is in
operation, the audio output of the detector must
pass through the limiter diode to the grid of the
audio amplifier. The limiter diode normally acts
as a conductor for the audio signal as long as the
anode is positive with respect to its cathode.
When a noise peak is higher in amplitude than the
signal, it instantaneously swings the cathode posi-
tive with respect to the anode, conduction ceases,
and that portion of the signal is automatically cut
off from the audio amplifier.
3-7. FUNCTION.
The FUNCTION switch performs the following
functions:
1. Operates the AC ON/OFF switch.
2. Connects the AM detector to the audio ampli-
fier and disables the BFO.
3. Connects the product detector to the audio
amplifier, energizes the BFO and switches in
the slow release AVC components.
3-8. SELECTIVITY.
The SELECTIVITY control is used to vary the selec-
tivity of the receiver to fit receiving conditions.
Three degrees of selectivity are available: 0.5 KC
for CW reception under crowded-band conditions,
2.5 KC for SSB, and 5 KC for maximum fidelity
during AM reception. The three selectivity posi-
tions are shown on the front panel adjacent to the
SELECTIVITY control and indicate receiver selec-
tivity at 6 DB down.
KC OFF RESONANCE
4
30
DB ATTENUATION
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60
80
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Figure 7. IF Selectivity Curves.
The receiver IF selectivity curves are shown in
figure 7. Note thatas the selectivity is varied from
a sharp to a broader position, the IF passband not
only increases but also shifts to a slightly higher
frequency.
It should be noted that two meter peaks will
appear when tuning a signal with the SELECTIVITY
control in the 5 (KC) position. The signal should be
tuned in with the SELECTIVITY at 2.5 (KC) and then
switched to the 5 (KC) position if desired.
For broadcast reception, the SELECTIVITY control
is normally set at 5, the position affording broadest
selectivity. Selectivity may be progressively in-
creased by turning the control to the positions
marked 2.5 and 0.5. For reception of the crowded
short-wave bands, it is generally advisable to
sacrifice fidelity for greater selectivity, since the
added selectivity reduces both adjacent-channel
interference and background noise by attenuating
-5
the higher audio frequencies. Too much selectivity
on AM signals, however, will attenuate the high
audio frequencies to such an extent that the signal
may become unintelligible asa result of excessive
sideband cutting. When receiving CW signals, the
sharpest selectivity position (0.5) may be used
without the loss of intelligibility experienced in
AM reception.
3-9. BEAT FREQUENCY OSCILLATOR (BFO).
The BFO is an inductively-tuned oscillator which
re-inserts the carrier at the product detector for
SSB or CW reception. The center frequency of the
BFO is 50.85 KC and is variable over a range of
+2 KC.
Placing the BFO frequency on the high-frequency
slope of the IF passband allows frequencies below
the BFO frequency to be accepted through the IF
passband (lower-sideband reception).
Placing the BFO frequency on the low-frequency
slope of the IF passband allows frequencies higher
than the BFO frequency to be accepted through the
IF passband (upper-sideband reception).
The correct settings for USB, LSB, and CW are
shown on the panel. It should be noted that changing
the BFO setting will affect receiver tuning. There-
fore, the bandspread dial should be calibrated with
the BFO control preset to the desired position.
The BFO control makes an excellent fine tuning con-
trol and will be found very useful as such for both
CW and SSB reception under crowded conditions.
3-10. CALIBRATE (CAL-OFF).
The CAL-OFF switch controls the operation of the
optional Model HA-7 Crystal Calibrator. When the
switch is set at CAL, the crystal calibrator is
turned on to provide marker signals at every 100
KC on the dial. The crystal calibrator employs a
crystal-controlled, pentode oscillator circuit. The
output of the crystal calibrator is capacitively
coupled to the antenna input circuit. A trimmer
capacitor, adjustable by the Crystal Adj. control on
the top of the calibrator unit, permits adjustment
of the calibrating crystal to exactly 100 KC by
comparison with the frequencies transmitted by
WWV. This capacitor has been set at the factory
and normally should not require readjustmentun-
less extreme calibration accuracy is required. If
adjustment is required, proceed as outlined in
paragraph 4-7.
NOTE
If the HA-7 calibrator is notused, the
CAL—OFF switch should be left in the
OFF position at all times.
3-11. TUNING AND BANDSPREAD.
The TUNING and BANDSPREAD controls are used in
conjunction with one another to tune-in the desired
signal. Coarse tuning is performed with the TUNING
control and fine tuning with the BANDSPREAD control.
A. MAIN TUNING DIAL
The main-tuning or left-hand dial is operated by
the TUNING control. This dial has five calibrated
scales, one for each of the four frequency bands
plus a logging scale. For normal tuning, the main-
tuning dial is set for the desired station frequency
after the BANDSPREAD control has been positioned
at the Bandspread Set line.
IMPORTANT
The readings on the main tuning dial
will correspond to the station frequen-
cies only if the BANDSPREAD control is
set at the Bandspread Set line. Ifitis set
at any other position, the additional
bandspread capacity added tothe main
tuning capacity will mis-calibrate the
main tuning dial.
The dial settings for the 80, 40, 20, 15, and 10
meter band, which includes the citizens band
(26.965 to 27.255 MC), are indicated on the main
tuning dial by small circle dots. When tuningwith
the bandspread dial, the main-tuning dial mustbe
set at the dot corresponding to the desired band.
International short-wave broadcast bands are
indicated by a double line and identified in meters.
B. BANDSPREAD DIAL
The bandspread or right-hand dial is operated by
the BANDSPREAD control. This dial contains five
scales ealibrated for the 80, 40, 20, 15, 10 meter
and citizens bands. These five scales are cali-
brated to read receiver frequency directly when
the main-tuning dial has been set to the index dot
of the desired band. For convenience in tuning, the
amateur bands are indicated on the bandspread dial
by double weight lines and the phone bands are
indicated by triple-weight lines.
NOTE
Use 10-meter dot for citizens-band
calibration.
The bandspread dial may also be utilized as a
fine tuning adjustment over any portion of the
receiver tuning range, Two methods of fine tuning
are described on the next page.
a. The first method of fine tuning isusedwhen
it is desired to tune in a single signal with
precision accuracy. First the BANDSPREAD
control is set a few degrees from its Band-
spread Set position, the desired signal is
located with the TUNING control, and then
the signal is accurately tuned in by rocking
the BANDSPREAD control (turning it slightly to
the left and right) until the signal isloudest
and clearest.
b. The second method of fine tuning is used
when it is desired to tune througha range of
frequencies, such as a group of short-wave
stations. Set the BANDSPREAD control fully
counterclockwise, set the TUNING control
for the high end of the selected range of
frequencies, and then tune through the range
with the BANDSPREAD control. Turning the
BANDSPREAD control clockwise tunes the
receiver progressively lower in frequency.
SECTION IV
OPERATION
4-1. AM RECEPTION.
1. Set the front panel controls to their starting
positions as outlined below.
КЕ САМ . ..... .......... 10 (maximum sensitivity).
BAND SELECTOR. . . .... | At the desired band.
AUDIO GAIN... 2.
ANTENNA ..... ... Peak on signal.
ANL-OFF . ............... OFF
FUNCTION ............... OFF.
SELECTIVITY ............. 2.5 ог 5.
CAL-OFF .......... ...... OFF.
2. Turn the receiver on by rotating the FUNC-
TION control clockwise to AM. The tuning
dials will light up, indicating the receiveris
operative. Rotate the AUDIO GAIN control
clockwise for the desired volume level.
3. Set the bandspread-tuning gang near mini-
mum capacity by rotating the BANDSPREAD
control to Bandspread Set, To utilize the BAND-
SPREAD control as a fine tuning adjustment
for the short-wave bands, refer toparagraph
3-11,
IMPORTANT
The calibration on the main-tuning
(left-hand) dial will be correct only if
the bandspread-tuning gang is set at
Bandspread Set. If it is set at any other
position, the additional bandspread
capacity added to the main-tuning
capacity will mis-calibrate the main-
tuning dial.
4, Tune to the desired signal with the TUNING
control, tuning for maximum clarity. After
the signal has been accurately tuned in,
readjust the AUDIO GAIN control as desired.
NOTE
The $ meter Will not give atrue indica-
tion of the IF selectivity because the
AVC bandwidthis approximately twice
as wide as the signal bandwidth atthe
detector.
When tuning an AM signal, it will be
found convenientto tune the signal with
the SELECTIVITY set at 2.5 and then
turn the SELECTIVITY control to 5after
tuning in the station.
5. Set the SELECTIVITY control for the desired
degree of selectivity. For standard-broad-
cast reception (Band 1), the control is nor-
mally set to 5 for maximum fidelity. The
positions marked 2.5 and 0.5 provide pro-
gressively increasing steps of selectivity.
Note that as the selectivity of the receiver is
increased, the background noise and inter-
ference from adjacent signals is reduced.
Too much selectivity, however, may cause
excessive sideband cutting. While side-
band cutting reduces fidelity, it may fre-
quently be preferable to sacrifice natural-
ness of reproduction in favor of communica-
tions effectiveness, When changing the posi-
tion of the SELECTIVITY control from a broad
to a narrower response, a slight readjust- -
ment of the tuning controls maybe necessary
to center the signal in the IF passband.
6. Use ANL (noise limiter) as noise conditions
dictate.
4-2. EXALTED CARRIER AM RECEPTION.
In short-wave reception, transmission conditions
frequently are different for waves of slightly dif-
ferent frequencies. In voice modulated transmis-
sions (particularly AM), which involve sideband
frequencies differing slightly from the carrier
frequency, the carrier and sideband components
may not be received in the same relative ampli-
tudes and phases that were present at the trans-
mitter. This effect, known as selective fading,
causes severe distortion of the signal.
Selective fading can be reduced considerably by
utilizing the selectable-sideband feature of the
Model SX-122 Receiver operating in an exalted
carrier mode (i.e., the transmitted carrier is
positioned out of the receiver's IF passband along
with one sideband, producing a suppressed carrier
single-sideband signal). The carrier is subse-
quently re-inserted by the receiver's BFOand the
signal is detected in the same manner asa single-
sideband signal.
Controls should be set as for SSB reception.
Either USB or LSB may be used.
4-3. SINGLE-SIDEBAND RECEPTION.
1. Set the front panel controls to their starting
positions as follows:
RFGAIN ............ 10 (maximum sensitivity).
BAND SELECTOR ..... At desired band.
AUDIO GAIN ......... Approximately 2.
FUNCTION .......... SSB/CW.
ВЁЕО ............... Usually LSB for 40 and 80 meters
USB for 20, 15, and 10 meters.
SELECTIVITY ........ 2.5.
АМТЕММА ........... Peak on signal.
TUNING ............ Set at desired index dot if tuning
amateur band.
BANDSPREAD ........ As desired.
Slowly tune into the signal until the voice modula-
tion sounds natural and adjust the Audio Gain
control for desired volume.
It should be remembered that an SSB signal will
convey intelligence only when the correct sideband
position has been selected by the BFO control, If
the signal does not tune properly, move the BFO
control to the opposite sideband position and retune
the receiver.
Under certain conditions, it may be found advan-
tageous to reduce the RF GAIN setting for improved
reception. It should be remembered that this will
reduce AVC and also affect the $ meter reading.
4-4. CW RECEPTION.
Set all controls as shown in single-sideband recep-
tion except for the BFO control which should be
set to the CY position.
N-
Under crowded-band conditions, it may be found
desirable to set the SELECTIVITY switch to the 0.5
position for improved selectivity.
4-5. USE OF CRYSTAL CALIBRATOR.
The optional Model HA-7 100-KC Crystal Cali-
brator permits accurate checking of the dial cali-
bration over any portion of the main and band-
spread tuning dials by comparing the dial cali-
brations with the marker signals which appear at
every multiple of 100 KC on the dial.
A. CALIBRATION OF THE BANDSPREAD DIAL
1. Set the bandspread-tuning dial at a conven-
ient multiple of 100 KC at the high-frequency
end of the band in use. For example: 4000
KC on 80 meters, 7300 KC on 40 meters,
14,300 KC on 20 meters, 21,400 KC on 15
meters, and 29,700 KC on 10 meters.
2. Set the main-tuning dial to the index dot of
the desired band.
3. Set the FUNCTION switch to SSB/CW, the BFO
switch to CW, and the CAL-OFFswitchto CAL.
4, Very carefully adjust the TUNING control for
the exact frequency as indicated by zero beat.
The bandspread-tuning dial is now accur-
ately calibrated and a zero beat should be
obtained at every multiple of 100 KC on the
band in use. For example, on the 80-meter
band, a zero beat should be obtained at or
close to 3500, 3600, 3700, 3800, 3900, and
4000 KC.
5. The procedure outlined in Steps 1 through4
above provides average calibration accuracy
over the entire frequency range of the band
in use. For precise calibration accuracy
over a particular section of the band, the
procedure is identical except that the band-
spread dial is set at a multiple of 100 KC
near the desired frequency or range of
frequencies, instead of at the high endofthe
band as in Step 1.
B. CALIBRATION OF THE MAIN TUNING DIAL
1. Turn the BANDSPREAD control counterclock-
wise until the dial pointerisaligned withthe
index marks at the high-frequency end of the
dial (Bandspread-Set line).
2. Set the main-tuning dial ata convenient mul-
tiple of 100 KC near the desired frequency or
range of frequencies. (The main-tuning dial
is calibrated in MC.) To determine the near-
est 100 KC multiple, simply remember that
100 KC is equal to 0.1 MC. For example,
from 2.0 to 3.0 MC on band 2, the 100-KC
multiples are 2.0 MC, 2.1 MC, 2.2 MC,
2.3 MC, etc.
3. Set the FUNCTION switch to SSB/CW. Then
set the CAL-OFF switch to CAL . If a
zero beat does not occur at the 100-KC
check point, turn the BANDSPREAD control
clockwise or counterclockwise as necessary
to establish Main-Tuning dial calibration.
4-6. USE OF THE $ METER,
The $ meter providesa visual means of determining
whether or not the receiver is properly tuned, as
well as an indication of the relative signal strength.
The $ meter circuit consists of a DC milliammeter
connected in series with the cathode lead to the
1650-KC IF amplifier tube, the grid of which is
controlled by AVC voltage. Since the cathode cur-
rent of this tube varies with the strength of the
incoming signal, the meter will indicate relative
signal strength, The $ meter is calibrated in S units
from 1 to 9 and in decibels above S-9. The indica-
tions on the S meter will be correct only when the
RF GAIN control issetat 10 (maximum sensitivity).
NOTE
If the RF GAIN control is set at a re-
duced position, the S meter may read
below zero under no signal conditions.
This is a normal condition,
4-7. CRYSTAL CALIBRATOR CHECK.
The Crystal Adj. control on the optional Model HA-7
Calibrator chassis operates a trimmer capacitor
connected across the 100-KC calibrating crystal,
This trimmer capacitor permits adjustment of the
calibrating crystal at exactly 100 KC by compar-
ison with the frequencies transmitted by station
WWV. This capacitor has been set at the factory
and should not require readjustment unless ex-
treme calibration accuracy is desired. If adjust-
ment is required, proceed as follows:
Set the FUNCTION switch to AM, theCAL-OFFswitch
to OFF, and all other front-panel controls for nor-
mal AM reception. Tune in station WWV on any one
of its operating frequencies (2.5, 5, 10, 15, 20, or
25 MC) and wait for the period during which the
signal from WWV is unmodulated. Then switch on
the crystal calibrator by setting the CAL-OFFswitch
to CAL and adjust its frequency, by means of the
Crystal Adj. control, until the crystal calibrator
signal zero beats with the signal received from
WWV. If the adjustment is attempted during per-
iods that WWV is modulated, an erroneous zero beat
may be obtained with the modulating frequency
instead of the desired carrier frequency.
4.8. OPERATING AND SERVICE QUESTIONS.
For further information regarding operation
or servicing of this equipment, contact the dealer
from whom the unit was purchased. The Halli-
crafters Company maintains an extensive system
of Authorized Service Centers where any required
service will be performed promptly and efficiently
at no charge if this equipment is delivered to the
service center within 90 days from date of pur-
chase by the original buyer and the defect falls
within the terms of the warranty. It is necessary
to present the Bill-of-Sale in order to establish
warranty status. After the expiration of the war-
ranty, repairs will be made for anominal charge.
All Hallicrafters Authorized Service Centers dis-
play the sign shown below. For the location of the
one nearest you, consult your dealer or your local
telephone directory.
Make no service shipments to the factory
unless instructed to do so by letter, as The Halli-
crafters Company will not accept responsibility
for unauthorized shipments.
The Hallicrafters Company reserves the
privilege of making revisions in current produc-
tion of equipment and assumes no, obligation to
incorporate such revisions in earlier models.
Authorized
hallicratters
Service Center
Communications Equipment
al
OAZ
VIO
oY 3
VG
GBAG
TS
T6
Ji
НА- 7
SOCKET ^^.
RIE
METER ZERO
RIS
METER
SENSITIVITY
VI
GDC6
6AUG
C518 —
CS51A la == asl Ш Ш e | : ALIGNMENT
| BANDSPREAD | q vrrrerrerenet pme ps | POINT C
o da
C3C Cp
c38 — C3A
SECTION V
ALIGNMENT
Output meter (or AC scale of VTVM), Connect
output meter to appropriate speaker output
terminals, If a VTVM is used, connect it to
terminals 3.2 SPKR and GND andterminate the
output with a dummy load.
This receiver has been carefully aligned at the
factory by specially-trained personnel using pre-
cision equipment. Alignment of the receiver should
not be attempted until all other possible causes of
faulty operation have been investigated. Alignment
should. not be required unless the receiver has
been tampered with or component parts have been INITIAL CONTROL SETTINGS |
replaced in the RF or IF stages. Alignment should >.
be performed only by persons familiar with com- Band Selector . ....onrreceo. As indicated in chart.
munications receivers and experienced in their
alignment. Refer to figures 8 and 9 for location of RF and AUDIO GAIN ....Ñ.o.eo. 10 (maximum).
all alignment adjustments.
ANL-OFF .......... . . OFF,
5-1. EQUIPMENT REQUIRED. FUNCTION ©... iii vee AM.
Signal generator covering 50 KC to 30 MC. Selectivity ...Ñ..eon.oceoseeo As indicated in chart.
Vacuum tube voltmeter (VTVM) or other
high-impedance DC voltmeter. Tuning and Bandspread . . . . . ... Gangs half meshed.
5-3. ALIGNMENT PROCEDURE.
SIGNAL SIGNAL BAND
STEP | GENERATOR | GENERATOR | SELECTOR | CONNECTIONS | SETTING REMARKS
CONNECTIONS | FREQUENCY | SETTING
50-KC IF ALIGNMENT
1 High side to 50 KC 0.540to | VTVM DC 0.5 KC |Remove first conversion oscillator
alignment (unmod) | 1.60 MC | probe to tube V3 from its socket to prevent
point A alignment signal interference. Adjust top slug
(terminal 2 point B of T6, T5, T4, and T3 (50-KC IF" s)
of T2). Low (junction of for maximum indication, maintain-
side to R55,R56,and ing approximately one volt reading
chassis. C84). Common on VTVM,
to chassis.
1650-KC IF ALIGNMENT
2 High side to 1650 KC | 0.540to | Output meter 5 KC tReplace tube removed in Step 1.
alignment (mod) 1.60 MC | across spea- Tune generator slowly through 1650
point C ker terminals KC to determine IF passband. Then
(stator of (VTVM to set generator to center of passband,
section C3B alignment using sufficient generator output to
of main point B if it obtain approximately 1/2 watt re-
tuning gang). is desired ceiver output and adjust the top and
Low side to to monitor bottom slugs of T2 and T1 for max-
frame of detector imum response. Tune through the
gang. voltage.) passband and observe the shape of
the response. If it is symmetrical,
the adjustment is completed; if not,
reset the generator frequencynear
the center of the passband and re-
peak T2 and TI.
IF SENSITIVITY CHECK
3 With the generator modulated 30% at 400 cycles and connected through a 0.05 HF capacitor to
the grid (pin 1) of the first mixer tube V2, the IF input required for 1/2-watt receiver output
should be approximately 15 microvolts (1650 KC).
L6 C48 L7 C47 C&D C62 LY C8I LID
C71
L2 Lil
Ll RES
C49 RF GAIN
SIC si
= BAND
SELECTOR
Li2
C59
se 7
S38 77)
ISELECTIVITY |
55
R60
[AUDIO GAIN|
S3A——|
ALIGNMENT 47)
POINT A
LS
BFO
ALIGNMENT
POINT 8
54
J2
156-0019
Figure 9. Bottom Chassis View.
Before proceeding with the RF alignment,
check the tuning dials for proper indexing.
Both dials should index on the marks at
the low-frequency end with the gang fully
closed.
Use an amplitude -modulated signal.
Set the RF and AUDIO GAIN to10 (maximum),
ANL -OFF to OFF, SELECTIVITY to 25 FUNCTION
to AM, and BANDSPREAD at Bandspread Set.
RF ALIGNMENT
Connect the output meter across the speaker
terminals. (Connect the VTVM to alignment
point B if it is desired to monitor the de-
tector voltage.) Maintain a 1/2-watt receiver
output.
Connect high side of generator through a
330-ohm carbon resistor to antenna terminal
Al, low side to A2. Connect jumper between
A2 and GND.
The oscillator frequency is higher than the
signal frequency on all bands.
BAND GENERATOR AND ADJUST FOR
STEP SELECTOR RECEIVER MAXIMUM
SETTING FREQUENCY
4 12.5 to 34 30.0 MC C59 (oscillator trimmer),
MC C50 (mixer trimmer), and
C2 (antenna trimmer)
12.5 to 34 14.0 MC L12 (oscillator slug)
MC L8 (mixer slug), and
L4 (antenna slug)
5 4.8 to 12.6 11.5 MC C60 (oscillator trimmer),
MC C49 (mixer trimmer), and
C2 (antenna trimmer)
4.8 to 12.6 5.0 MC L11 (oscillator slug),
MC L7 (mixer slug), and
L3 (antenna slug)
6 1.75 to 4.9 4.6 MC C61 (oscillator trimmer),
MC C48 (mixer trimmer), and
C2 (antenna trimmer)
1.75 to 4.9 2.0 MC L10 (oscillator slug)
MC
7 0.54 to 1.60 1.4 MC C62 (oscillator trimmer),
MC C47 (mixer trimmer), and
C2 {antenna trimmer)
0.54 to 1.60 0.6 MC C171 (oscillator padder)
MC
5-4. S METER CALIBRATION.
1. To adjust the Meter Zero the antenna should
be disconnected and the receiver antenna terminals
shorted; RF GAIN full on.
Adjust the Meter Zero potentiometer (R16) on
the rear apron of the chassis until the meter
pointer is directly over the last calibration mark
on the left side of the meter scale, With this
adjustment made, if the RF GAIN is rotated counter-
clockwise, the meter may readbelow zero. This is
normal,
NOTE
Allow at least one-half hour warmup
time before making any adjustments.
2. To adjust the meter calibration, it will be
necessary to have a signal generator that is
accurately calibrated in microvolts output.
a, Setgenerator to 14,3 MC and 50 micro-
volts output.
b. Place SELECTIVITY switch to the 2,5
position, FUNCTION to AM and care-
fully tune receiver for maximum $ meter
deflection at 14,3 MC,
-13
с. Peak ANTENNA trimmer (C2).
d. If the meter does not read 59, adjust
Meter Sensitivity potentiometer (R13)
near top center of chassis forS9 read-
ing.
e, Recheck Meter Zero setting and repeat
adjustments if necessary.
5-5. BFOCALIBRATION.
To check the BFO calibration, set the receiver
controls for CW reception, SELECTIVITY to 0.5
and tune in an unmodulated signal for maximum
S meter deflection. With the BFO control at mid
rotation (CW position), the beat-note frequency
should be between 700 and 1000 cycles and zero beat
should occur with the control rotated approxi-
mately forty-five degrees clockwise from the cen-
ter position.
If the control is far from its correct setting, it
may be roughed in in the following manner.
. 1. Remove the BFO knob and the adapter
bushing from the BFO tuning shaft.
2, Set receiver controls for CW reception,
SELECTIVITY in the 2.5 position and tune receiver
to clear frequency (no signal).
3. With screwdriver, run the BFO tuning shaft
in or out as necessary to the point where the noise
becomes lowest in audio pitch witha symmetrical
rise in pitch in either direction from this point,
With the shaft set at the point of lowest audio
noise pitch, replace the shaft bushing withthe long
set screw straight up (vertical position).
4, Replace BFO knob with indicator line in CW
position (mid rotation).
SECTION VI
SERVICE DATA
6-1. TECHNICAL SPECIFICATIONS.
FREQUENCY COVERAGE
FREQUENCY CALIBRATED
BAND RANGE BANDSPREAD
1 0.540 to 1.60 MC _
2 1.75 to 4.9 MC 80M
3 4.8 to 12.6 MC 40M
4 12.5 to 34.0 MC 20, 15, 10M
?
Citizens Band
TUBES
Nine plus voltage regulator and rectifier,
SPEAKER OUTPUT
3.2 ohms
HEADPHONE IMPEDANCE
50 to 5000 ohms,
ANTENNA INPUT IMPEDANCE
50 to 600 ohms.
POWER SOURCE
105 to 125 volts, 50/60 cycles.
POWER CONSUMPTION
85 watts,
RECEPTION
AM, CW, and SSB.
14-
INTERMEDIATE FREQUENCIES
(Double Conversion): 50 KC and 1650 KC.
DIMENSIONS (overall) (HWD)
8 by 18-3/4 by 9-13/16 inches (HWD).
SHIPPING WEIGHT
32-1/2 pounds.
NET WEIGHT
28-3/4 pounds.
6-2. 50-KC-1F SYSTEM.
Figure 10 shows the type of coupling used in the
50-KC IF system, Note that inductive coupling is
avoided by careful shielding of the IF coils and
signal transfer occurs only through capacity and
resistance. By increasing the value of R (resis-
tance) and decreasing C (capacity), the selectivity
is made broader; while decreasing Rand increasing
C causes the selectivity to become sharper. The
proper values of CandR are switched in the circuit
by means of the SELECTIVITY control. R varies
the Q of the tuned circuit and Cvaries the coupling.
This R-C coupling arrangement affords a more
accurate means of selectivity control than that
readily obtainable by any other method.
6-3. CHASSIS REMOVAL.
Both the top and bottom covers can be removed for
easy access to both sides of the chassis. To remove
the chassis and panel assembly from the cabinet,
remove the four outer bottom screws and slide
chassis forward through front of cabinet.
V5 v6 1/3 V8
2ND MIXER SO0KC IF AMP DET
6BLE 6 BAG 1/3 6BNS
7
|
|
|
À
= =
B+
156-001905
Figure 10. Equivalent Schematic Diagram of 50-KC IF System,
IMPORTANT 6-5. DIAL RESTRINGING.
To remove the top cover, turn the four
screws counterclockwise one quarter
turn and lift cover. Do not attempt to
remove these screws.
To remove the bottom cover, remove the four
inner bottom screws,
6-4. TUBE AND DIAL LAMP REPLACEMENT,
To gain access tothe tubes and dial lamps, remove
top cover (see IMPORTANT note above). See label
on the inside rear of cabinet for tube location.
The bandspread gang restringing (figure 11) may
be accomplished without removing any parts.
Before starting, attach the tension springs to the
cable, rotate the BANDSPREAD control knob fully
clockwise, and set the bandspread gang in its
closed position. Attach the spring atone end of the
cable to position 1 onthe pulley as shown in figure
11 and follow the stringing sequence 1 through 9.
After stringing, check to see ifthe dial scale lines
up with the pointer when the bandspreadgangis in
its closed position. If the index marks onthe scale
do not line up, loosen the set screws holding the
dial to the shaft and rotate to proper position,
Y
156-001841
Figure 11. Restringing the Bandspread Gang.
-15
MAIN TUNING
3-1/2 TURNS
BANDSPREAD
Figure 12. Restringing the Main Tuning ond Bondspread Dials.
In order to restring the dial drive of either the
main tuning or bandspread dial, the front panel,
pointer, and dial scale should be taken off for
accessibility. In both drives the gang is set in its
closed position. Attach the knotted end of the
string to position 1 on the pulley as shown in figure
12 and follow the stringing sequence 1 through 7.
156-001840
6-6. VOLTAGE AND RESISTANCE MEASUREMENTS.
The voltages normally present at the pins of the
various tubes within this receiver are shown in
figure 14, The resistances present at these same
pins are shown in figure 15. To identify the tube
elements by pin number, refer to figure 18, the
schematic diagram.
ANTENNA
SBN8
AVC AMPLIFIER
v6 AVC RECTIFIER
6ВАб AM DETECTOR
50 KC
IF с
AMPLIFIER ANL
vi v2 va v5
60C6 6AU6 6DC6 6818
RF FIRST 1650 KC SECOND MIXER
AMPLIFIER MIXER LF CRYSTAL
AMPLIFIER OSCILLATOR
A
| В Ede SEs EE
i | \ | а
| | |
4 | |
| L — bte Вто сек | сит ен ен | À ЖЕН | НМ М мн мн em em es em —_—-_ === ттт == -_ — J Y
|
|
r “1 SSB/CW AM
| | = A O
L. — „= =) dian aan ous
HA-7 v3 5
CALIBRATOR 6C4
VARIABLE
OSCILLATOR BES A vs
6GW8
PRODUCT DETECTOR AUDIO AMPLIFIER
VIG VII 8 AUDIO OUTPUT
5Y 3 Од?
RECTIFIER VOLTAGE
A 1
B |. Ort
PHONES Q _O—o
156-001638
Figure 13. Block Diagram of the Model SX-122 Receiver.
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Figure 14. Voltage Chort of Receiver.
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Figure 15. Resistance Chort of Receiver.
18-
SECTION VII
100-KC CRYSTAL CALIBRATOR
MODEL HA-7
УЗО!
109 кс
CRYSTAL
\ зо
SAVE
C30
CRYSTAL
and,
| | PAI
| Sd OO а
Figure lá Model HA 7 100 KC Crystal! Colrbratos.
71. GENERAL
The Mndel HA-T 160-KC Crystal Calibrator 1s à
precision-bult accessory wiich provides marke:
siznals at every 100 KC on the dial of the SX-192
enabling the operator te check calibration ac-
curacy. The HA-7 18 placed into operativi by
pluegins ot into the appropriate socket (J[) on
the receiver chassis (see Ги yre Bl and placine the
frunt panel (Al OF! switch an the € 4j position
(refer to patagrap 3-10),
IMPORTANT
Theí Y OFF switch should he returned
to tne OFF position after calibrationtn
prevent SoUTIOUS Si fnal reneration.
7-2. ADJUSTMENT.
À trimmer capacitor, adjustable by the Crystal Adi
control on the top of the calibrator unit, permits
adjustment of the calibrating crystal to exactly
100 КС by comparison withthe frequenciestrans-
mitted by station WWV, This capacitor has been
set at the factory and normally should not require
readjustment unless extreme calibrationaccuracy
is required. If adjustment should be necessary,
proceed as outlined in paragraph 4-7 of this
document,
PARTS LIST
SCHEMATIC
AYMBOL DESCRIPTION
HALLICRAFTERS
PART NUMBER
100-KC Crystal Calibrator 001-004394
Assembly (Model HA-7)
C30! Capacitor, Variable. 8 to 044-0043,
50 uu F, Crystal Adj.
C302,304 Capacitor, 0,01 uF. 500V, 047-100224
Ceramic Disc
C303 Caj.acitor, 82 uu F,
10%, Mica
CR301 Diode. Type 1N295
F301 Plug, 5-Pin (Connects to
J1 on SX-122)
R301 304 Resistor, 220K Ohms,
10%. 1 2 watt, Carbon
470-213820
019- 301980
035- 100038
45351-252224
R307 Resistor, 4700 Ohms, 10%, 451-2524 72
1 2 watt, Carbon
H303 Resistor, 100K Ohms, 451 -252104
10%. 1'2 watt, Carbon
V301 Elect;on Tube, Type SAU6 090-900&0f
Y 301 Crystal, 100-KC Marker 019-202351
Shield, Cover 069-001719
Socket Crystal (Y301) 006-200296
Socket, Tube (V301) 006-100759
cu 100-KC CALIBRATOR |
RIO]
IN295
| OO BOSAL
5 R303 $R304
ma | CAL.2 Ne 00K |220K |
| C303 1.C304
fs Look T 82 Tool
NTS TUUF ¥
| sont | C302
47K $ T 0.0! MODEL | |
Т НА-7
Figure 18. Schematic Diagram, Model HA-7 Crystal Calibrator.
156-002050
SCHEMATIC
SYMBOL
C1,25,33,
42 45,52
с?
C3A,B,&C
C4,43,85
C5,18,21,
26,28,34,
40,82
C6,0,10,11,
12,44 78,93
C7,8,35
C13,15,22,
84,92,95
C14,29,39,
41,94
C16,30
C17
С19
C20
C23,24,
31,32
C27,37,80,
81,83,80,
91,98
C38
C38
C46,54
C47
C48 49,62
C50
C51A&B
©5374
C55
C56,58
C57
C59
ceo
Cal
ce3
ces
Ces
Ces
ce?
ces
Ces
C70
cn
c72
cn
C75
C77
C78,87
C79,88
C86,96
C89
сет
Css
A,B&C
C100
DESCRIPTION
CAPACITORS
2.2 uu F, 10%, 500V, Composition
Variable, 4.8 uu F to 57 uu F,
ANTENNA Trimmer
Variable, TUNING
220 uu F, 5%, 500V, Plastlc Mica
0.02 uF, +80%, -20%, 500V,
Ceramic Disc
Ceramic Disc
0.005 uF, +80%, -20%, 500V,
10 uu F, 5%, 800V, Plastic Mica
0.01 uF, +80%, ~20%, 500V,
Ceramic Disc
0.1 uF, +80%, -20%, 50V,
Ceramic Disc
100 uu F, 5%, 500V, Plastic Mica
47 uu F, 5%, 500V, Plastic Mica
20 uu F, 5%, 500V, Plastic Mica
120 uu E, 5%, 500V, Plastic Mica
390 uu F,5%, 500 V, Plastic Mica
0.001 uF, 20%, 500V,
Ceramic Disc
330 un F, 5%, 500V, Plastic Mica
1000 up F, 5%, 500V, Plastic Mica
25 uu F, 10%, N750,
Ceramic Tubular
Variable, Trimmer, 1.5.4 F to
15uuF
Variable, Trimmer, 3 uu F to
30 uu F
Variable, Trimmer, 4 uu ¥F tu
80 up F
Variable, BANDSPREAD
100 uu F, 10%, N750,
Ceramic Tubular
TuuF, £0.25 ци Е,
N1500, Ceramic
5 up F, £0.25 uu F,
N3300, Ceramic
11 uu F, 5%, N1500, Ceramic
Variable, Trimmer, 4.5uuF to
25 uu F, NPO
Variable, Trimmer, 2.5 uuF to
13 pu F, NPO
Variable, Trimmer, 4.5uu¥F to
25 ци Е, МРО
1000 uu F, 5%, 500V,
N2200, Ceramic
Ceramic Tubular
Ceramic Tubular
10 uu F, 10%, NPO,
Ceramic Tubular
Ceramic Tubular
160 ци
10 uuF, 0.5 ци Е,
N3300, Ceramic
1.0 uu F, 0.1 uuF,
N2200, Ceramic
1.0 uuF, 10%, N750,
Ceramic Tubular
Variable, Trimmer, 118 uu F
12 uu F, 250V, Electrolytic
4700 uuF, 5%, 400V,
Paper Tubular
0.01 uF, 5%, 400V,
Paper Tubular
470 uu F, 5%, 500V Plastic Mica
0.47 uF, 10%, 200V
Paper Tubular
10 uF, 25V, Electrolytic
60 uF, 450V; 20 uF, 450V;
20 uE, 400V; Electrolytic
5 uuF, 5%, 500V,
Plastic Mica
1300 uu F, 5%, 500V, Plastic Mica
100 uu F, 10%, NPO,
880 pu Е, 5%, 500V, Plastic Mica
320 up F, 5%, N750,
240 pu F, 5%, 500V, Plastic Mic
220 uF, 5%, N30,
HALLICRAFTERS
PART NUMBER
047-200403-04
048-000546
048-000547
493-110221-234
047-100242
047-101381
493-110100-231
047-100217
047-0011 46
493-110101-234
493-110470-233
493-110200-231
493-110121-234
493-110391-234
047-101671
493-110331-234
493-310102-234
491-008250-95
044-100399
044-100396
044-100395
048-000548
491-026101-94
479-011070
479-031050
479-015110
044-200453
044-200452
044-200451
047-200441
493-310132-234
491-058101-22
493-310681-234
491-065321-94
491-008100-22
493-110241-234
‹ 491-085221-73
044-100398
479-032100
479-220010
491-006010-94
045-001121
046-001312-03
046-001316-03
493-110471-234
046-001302-04
045-000934
045-200113
493-110050-231
SERVICE REPAIR PARTS LIST
SCHEMATIC
SYMBOL
RI,26,56
R2
R3,7,14
R4
R5,17
R6,12,22,
31,35,36,58
R8
R9,23
R10,47,
40,50,62
R11,29,
38,39
R13
R15
R16
R18
R55
R567
R59
R80
R81
R63
R64
Res
В66
R87
R68
R69
“
DESCRIPTION
* RESISTORS
1 Megohin
22 Ohms
[5 Ohms
180 Ohms
33K Ohms, 1 watt
100K Ohms
2.2 Megohms
2200 Ohms
220K Ohms
3300 Ohms
Variable, 2 Megohms, 30%,
1/4 watt, Meter Sensitivity
150 Ohms
Variable, 400 Ohms, 30%,
1 watt, Meter Zero
120K Ohms
1500 Ohms
4700 Oluns +
22K Ohms Co
47K Ohms, 2 watta
22K Ohms, 1 watt
100 Ohms
47K Ohms
330 Ohms
68K Ohms
6800 Ohms, 1 watt
3300 Ohms, 1 watt
10K Ohms, 1 watt
6K Ohms, 5 watts, wire wound
10K Oluns
3.9 Megoluns
220 Ohms
390 Ohms
820K Ohms
180K Ohms
10 Megohms |
Variable, 500K Ohms, 30%,
1/8 watt, AUDIO GAIN
15 Megohms
880K Ohms
150 Ohms, 1 watt
Variable, 10K Ohms, 20%,
1 watt, RF GAIN
330K Ohms
47 Ohms, 1 watt
300 Ohms, 5 watts, wire wound
1500 Ohms, 5 watts, wire wound
HALLICRAFTERS
PART NUMBER
451-252105
451-252220
451-252150
451-252181
451-352333
451-252104
451-252225
451-252222
451-252224
451-252332
025-001 957
451-252151
025-002293
451-252124
451-252152
451-252472
451-252223
451-852473
451-352223
451-252101
451-252478
451-282331
451-252683
451-352682
451-352332
451-352103
445-012602
451-252103
451-252395
451-252221
451-252391
451-252824
451-252184
451-252106
025-002254
451-252156
451-252684
451-352151
025-002253
451-252334
451-352470
445-012301
445-012152
* All Resistors are carbon type, 10%, 1/2 watt,
unless otherwise specified.
= еб ба, gE we
COILS AND TRANSFORMERS
Coil, Antenna, Band 1
Coil, Antenna, Band 2
Coil, Antenna, Band 3
Coil, Antenna, Band 4°
Coil, BFO
Coil, Mixer, Bands 1 and 2
Coil, Mixer, Band 3
Coil, Mixer, Band 4
Coil, Oscillator, Band 1
Coil, Oscillator, Band 2
Coil, Oscillator, Band 3
Cotl, Oscillator, Band 4
Transformer, 1850-KC IF
Transformer, 50-KC IF
Transformer, Output
Transformer, Power
ELECTRON TUBES AND DIODES
Tube, Type 8DC6
Tube, Type 6AU6
Tube, Type 8C4
Tube, Type 8BL8
Tube, Type 8BAS
Tube, Type SBES
Tube, Type 6BN8
050-000952
050-000952
050-000954
050-000955
054-000059
051-201319
051-201328
051-201 327
051-201328
051-201921
051-201933
051-201321
050-000788
050-200489
055-000519
052-300221
090-901328
090-200808
090-900830
090-901350
090-901112
090-901124
090-001 465
SCHEMATIC
SYMBOL
ELECT
ve Ti
У10 T
vil T
CR1 Di
si R
SIA w
sIB \
SIC w
510 Ww
82 я
s3 В
54 Ri
$5 81
Bi
Ci
Ci
Ca
Cl
Ce
a
Ci
Ce
Ce
Y1 Ci
Di
Di
E
Di
Di
Es
Ра
Fl
Fr
F1 Fu
Fu
GL
Ja Ja
Mi
DS1,2,3
J1
TB1,2
эй ей в nn En REE EE re Wu YEE Бон» й
ERES
i
IST
HALLICRAFTERS
PART NUMBER
si
FR
—451-252105
451-252220
451-252150
¿S51-252181
451-352333
REMOV/
JUMPE451-252104
451-252225
451-252222
451-252224
CI
SL 451-252332
025-001957
cairo Co
SOCKET 25-002293
es 451-252124
40 y 451-252152
5 451-252472
451-252223
451-652473
451-352223
451-252101
451-252473
451.252331
451-252683
451-352882
451-352332
451-352103
445-012602
451-252103
451-252395
451-252221
451-252391
451-252824
451-252184
451-252106
025-002254
Г
1451-25256
451-252684
451-352151
025-002253
1 451-252334
NO.‘451-352470
C445-012301
051445-012152
2 watt,
v
Î 050-000952
050-000953
050-000954
050-000955
054-000059
051-201319
051-201326
051-201327
051-201328
051-201921
051-201933
105 125 051-201321
050-200489
055-000519
052-300221
090-901328
090-200806
090-900830
090-901350
090-901112
090-901124
090-001 465
SCHEMATIC
SYMBOL
HALLICRAFTERS
DESCRIPTION PART NUMBER
ELECTRON TUBES AND DIODES (CONT)
ve
v10
vil
CRI
si
SIA
vi
Fi
J2
Ml
DS1,2,3
J1
TB1,2
Tube, Type 6GW8 090-001502
Tube, Type 5Y3GT 090-901111
Tube, Type OA2 090-900001
Diode, Type 1N456 019-002064
SWITCHES
Rotary, BAND SELECTOR — —-=--=--=.-
Wafer, Oscillator 062-200055
Wafer, Oscillator 062-200054
Wafer, Mixer 082-200053
Wafer, Antenna 062-200053
Slide, SPDT, CAL-OFF 060-002548
Rotary, SELECTIVITY 060-002626
Rotary, FUNCTION (Inc. ONOFF) 060-002628
Slide, SPDT, ANL-OFF 060-002546
MISCELLANEOUS
Bracket, Meter Mounting 087-011850
Cabinet 086-004055
Cabinet Bottom Assembly 150-008768
Cabinet Top Assembly 150-008770
Clip, 1F Transformer Mounting 078-003779
Core, Coil Tuning (L3-4-7-8-10) 077-100088
Core, Coil Tuning (1,5) 003-103289
Core, Coil Tuning (L11) 003-101543
Core, Coil Tuning (L12) 077-101338
Core, Coil Tuning (T3-4-5-6) 003-101831
Crystal, 1700 KC 019-003231
Dial Cord, Bandspread Gang 038-000061
Dial Cord, Tuning and 038-000049
Bandspread Dials
Dial Scale, BANDSPREAD 083-001028
Dial Scale, TUNING 083-001030
Escutcheon, Front Panel 007-0008 71
Feet, Plastic Mounting 018-201072
Flywheel 071-000212-02
Front Panel 088-001 455
Fuse, 2 Ampere, S/B 039-100428
Fuse Holder (Inc. Hardware) 006-200845
Glass, Dial Window 022-000711
Jack, PHONES 036-000350
Knob, TUNING 015-001593
and BANDSPREAD
Knob, RF GAIN, BAND SELEC- 015-001760
TOR, ANTENNA, AUDIO GAIN
SELECTIVITY, BFO, and FUNCTION
Line Cord 087-100078
Loek, Line Cord 076-100397
Medallion, Hallicrafters H 007-000850
Meter, 0-5 MA Deflection 082-000603
Pilot Lamp, Type NO. 47 039-100004
Pointer, BANDSPREAD and 082-000800
TUNING Dials
Shaft and Index Plate, 074-200172
BAND SELECTOR
Shaft, Antenna Trimmer 074-002883
Shaft, Control, TUNING 074-002878
and BANDSPREAD
Socket, Accessory (HA-7) 008-100188
Socket, Pilot Light 086-000665-02
{Bandspread Dial)
Socket, Pilot Light (Meter Dial) 0988-000868
Socket, Pilot Light (Tuning Dial) 088-000665-01
Socket, Tube, Octal (V10) 008-200298
Socket, Tube, 7-pin 008-200633
miniature (V1-2-4)
Socket, Tube, +pín miniature (V3) 008-001048
Socket, Tube, 7-pin 006-000946
miniature (V6-7)
Socket, Tube, 7-pin 008-100644
miniature (V11)
Socket, Tube, 9-pin miniature (V5) 008-200672
Socket, Tube, 9-pin 006-200493
miniature (V8-8)
Spring, Dial Cord Tension, 075-000139
Bandspread Gang
Spring, Dial Cord Tension, 075-000893
Tuning and Bandspread Dials
Terminal Board, Antenna 088-002461
and Speaker
Tube Shield (V1-2-4) 069-000097
Tube Shield (V5) 069-000855
N
vi
6DC6 É
RF AMPLIFIER FIRS
10 5
\ E 7 [= 6 E
g wn i — 1
ca R2 Ки ned кт $ RO y +
8 $10 220 22 2 WOK 15 2.2
REAR Les
y
pta „A RI R3 3 Raj Cs RS cs er 10 | по
Le J Tes esc is 1 190] 0.02 33K | 0.005 to T 220€
° ` Y MEG UF Iw UF
REMOVAB [BAND 3} '
L3 EA
i
INPUT ¿|BANO2| A '
+‘
L2 [oi ts] ;
A Ci 4
22 c [BAND 1 | à ;
Li [pits]
KHA-7 + ‘
CALIBRATOR | SENSITIVITY
SOCKET I
dz AVC
40 1 с22
! Jl t R 0.01
5 82 | +270VDC Y UF
OFF в
~~ oN + i50 vDC REGULATED |
D br calle A A EA EL ME mE TEE A ENE EARNER Ne очко = = = = == т == = = =” = We = = = = =
CAL - CFF LE I car pr4+---"---0000000 RR. ...
+
BAND | | Y [1575 Е
| B 12 JI j ; 12
BAND LE ; N
3- ‘ 10
Ces | „ TN
R39 22 7 9
3300 г >
. | в
L7 | $18 sis
T{ FRONT REAR 6
ces
1000
cs: LIZ SAND 4
OCA c54 | у É
ST a ess AK ces
LE 7 4.5-
el {1 L5- | 1300
| E +
R40
3300 Ss
1 w Las Le
Rn RR
$2 Lii BAND 3 ES
1 1 1 T Ÿ cs cso *
NO.4T | NO.47 | NO.47 + + a Bi 5 251 cer
vi v2 уз 13 | 320
Le
051 0s2 | oss ; 3 5 +
3 4 3 4 4 4 +
LIO C68
c.p BANDZ 10
ve v5 v6 v7 ve vo | —
C57 1
4 5 4 3 5 5 п 45-| ces
25 | 240
sf
+ y
c70
LO 220
с B BAND! uz
Rn
*css 7cez| C7
А | 5 3-1 116-
+270VDC 30 | 160
ую + %
SY3GT ст?
RECTIFIER у 10
FT-
ve va SA
BAUS 6DC6 1/2 6BL8
IST MIXER I650KC ТЕ AMPLIFIER SECOND MIXER CRYST.
1 C16
4 TI! 1650KC TZ 650KC Tios
Г Г” - ps wie ——_——j—
= сю 2 | + $
a 4600 6 В El 390 R14 К ] A
7 UF 5 PE 15 e cr a
: | vi
1700 o Y
9 $ ce RIO Cli RU R12 с12 RIS ¢ Cle RI? Ri9$ cs R2C ¢ R21 3 cre кс À
0010005 F 220xŸ 0.005 3300 ¡OK! 0.005 iso} 6.1 33K 1500 6.01 a7001 22K1 Tooz
YF ur UF UF LW UF UF я
Y
' +270
vDC
RIE -
400 м/о 8
METER
ZERO
[ais * 1
METER > 3
SENSITIVITY | MEG
SENSI
+270 VOC
+180 VOC REGULATED N
= af E == == e R42 R44
1 ¡[BANOSPREAD] 674 10K {OK с77 78 Cc?
mn mm nn 1" = === 7 „100 tw UF 4700 0.01
К > 250v UF
te Ji V3 cs
6C4 10 x 2
„ 48{ FIRST 3
c3a Ltma Lc73 ONVERSION *
\ Xx a 1.0 OSCILLATOR 4
SIA
SIA Y / FRONT
REAR ;
CI00 de de E ао ные оо = = = = = = = = = = +
46
свг
0.02 Re
UF 1 22C
RAS
rai 22K
1? 2K R46 AVC Кута +
м cso AMPLIFIER 90
E .
ws [9691 la
NOTES: : „== -
I. UNLESS OTHERWISE SPECIFIED. A LY
A. ALL RESISTORS ARE IN DHMS, 10 %, 1/2 WATT. E N= eee. -
8. ALL CAPACITORS ARE IN MICROMICROFARADS (UUF)
SEE PARTS LIST FOR VOLTAGE RATINGS.
£. ALL SECTIONS OF BAND SELECTOR SWITCH $1 ARE GANGED КД R48
TOGETHER ON A COMMON SHAFT. OF 1500
3. THE POWER ON-OFF SWITCH IS PART OF FUNCTION SWITCH
84 (COMPLETELY COUNTERCLOCKWISE POSITION),
4. [==] SIGNI FIES FRONT PANEL MARKINGS. +270 vOC
J 8. BAND SELECTOR SHOWN IN .540-1.60 MC POSITION.
6, SELECTIVITY SWITCH SHOWN IN 5.0 KC POSITION.
7. FUNCTION SWITCH SHOWN IN OFF POSITION.
Figure 18. Schematic Diagram, Model 5X-122 Receiver.
nf EI WO WUE WS EE UD Ud A DA AD o o WRT appeal SEA seis =
c23 V6 с!
1/2 6BL8 390 [ 6BAS 390 =
CRYSTAL OSCILLATOR + 50KC IF AMPLIFIER =k
390
c37
y 0.001 T
UF
9 : T3 Е cas 2/76 cas
A Sn * 10
pat He me =
+
= b || J L_L] 47K R35
C19 a 4 4 100K
Tod iu, ES = e
кс 100K | cao }r23 : Less
120 2200 0,02
| R29
+ 3300 e pro
cel 24 c28 9
St рем 6.02
UF PA + UF
RS
22K
1
SENSITIVITY
| AVC AVC
R31} | C89
+270 VDC 100K Tos
т сто >
0.01
UF |
; + R36 §
100K
‚)
' /
Ea 8 у 54
| Y и 74 °
TIT TT / 3%
RSE R53 | R54 y соо col
390 a 390 A 7 0.001 0601 T
т + UF UF
/
B A /t 1 coz
cas RSS 1 | ss / | Too
ява} 820K ON UF
oo | / УФА ves
UF + mes CRI À /
ve IN456 . } / 1/2 66W8 1/2 6GW8
6BN8 o ces FIRST AUDIO AUDIO OUTPUT
| AVC cos AVC AM RS? mES | OFF aro /
IMPLIFIER ra RECTIFIER DETECTOR 180K A 1 / WE veu
3 IRSE /
; | Sa Tao HOOK /
; - 7 8
[ее /
y Г
cer
1800 220% /
/ 25v $
/
7 + 270 VDC
/
or ai
я 4 ,
7 UF [2 IW +
/ RES REE |
| 7 REMOVARS A
TB2
JUMPER я
/ E
7 SPEAKER
` /
/
/
155- 900001
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