SX-122 Communications Receiver
 7
VALLAN Y
“The Hallicrafters Company warrants each new radio product mani
factured by it to be free from defective materiel and workmanship
and agrees to remedy any such defect or to furnish a new part in ex-
change for any part of any unit of its manufacture which under nor
mal installation, use ani service discloses such defect, provided the
unit is delivered by the owner to our authorized radio dealer, whole-
saler, from whom purchased, or, authorized service center, intact, for
examination, with all transportation charges prepaid within ninety
days from the date of sale to origmal purchaser and provided thai
such examination discloses in our judgment that it is thus defective,
This warranty does not extend to any of our radio products which
have been subjected to misuse, neglect, accident, incorrect wiring not
our wR, Improper installation, or to use in violation of instructions
furnished by us, nor extended to units which have been repaired or
altered outside of our factory or authorized service center, nar to cases
where the serial number thereof has been removed, defaced or changed,
nor to accessories used therewith not of our own manufacture.
Any part of ¢ unit approved for remedy or exchange hereunder will
be remedied or exchanged by the authorized radio dealer or whole-
saler without charge to the owner.
This warranty is in lieu of all other warranties expressed er implied
and no representative or person is authorized to assume for us any
other liability in connection with the sale of our radio products’
e hallicrafters ©
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Figure 1.
SECTION
GENERAL
The Hallicrafters' Model SX-122 Communications
Receiver is a four-band dual-conversion super
heterodyne receiver tuning from 540 to 1600
xilocyeles (KC) and 1.75 to 34 megacycles (MO)
with calibrated electrical bandspread providedon
the 80, 49, 20, 15, 10 meter and citizens bands,
The freguency range covers foreign and domestic
short-wave broadcasts, amateurs, aircraft, and
marine pius standard AM broadcast ES, The receiver
provides for the reception of code (CW), voice (AM),
and single-sideband (S5B) signals over its entire
tuning range, the upper or lower sideband being
readily selectable by means of a front-panel
control, This feature greatly simplifies tuning of
single-sideband signals.
The SX-122 Receiver employs dual conversion on
all bands to obtain optimum image rejection.
À high order of selectivity is made possible by
the use of a 50-KC second-IF system with four
[email protected], permeability-tuned circuits. Receiver
selectivity is variable in three steps: 0.5 KC, 2.5
KC, and 5 KC at 6 DB down.
á tumed-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 RY stage to
compensate for loading effects of various antennas.
Outstanding frequency stability is achieved by the
цве of: 1) ceramic trimmers and coil forms in
the first-conversion oscillator, 2) extensive tem-
perature compensation, 3} voltage regulation of
156-001957 7
Hallicrafters’ Model SX-127 Receiver.
oscillators, and 4) a crystal-controlled, second-
conversion oscillator,
Tuning is accomplished by a precision tuning
mechanism to insure close calibration and ac<-
curate resettability, Smooth flywheel tuning af:
fords maximum traverse speed and operating “00
ease,
Provisions have been incorporated toaccept, asan
accessory, a 100-KC Crystal (Calibrator, Model
HA-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 où pulse-type noise.
An Smeter is used to indicate the accuracy of tuning
and the relative strength of received signals, The
meter is calibrated in 5 units from Í to 9, and in
decibels above 59,
Provision has been made in the receiver for a
remote receive~standby control,
Audio output connections include terminals for a
3.2-0hm speaker. A front-panel jack is also
provided for using headphones and the speaker 1s
automatically silenced when the headphone plugs is
inserted, =
The receiver is designed to operate on 105 to
125 volt, 50/60 cycle, AC current.
INSTALLAT
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
3>r destroving 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 iocatedin 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 RT 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-
wi 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 SO-239 connector for coaxial-cable
installations.
A, SINGLE-WIRE ANTENNA
The simplest antenna that will provide satisfactory
resuits 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 AZ 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 ofan outside ground
rod installed in accordance with Insurance Under-
Writer's Laboratories requirements is adequate
à
нее — ANTENNA WIRE
E _ AUMPER
LINK
135-0517 47
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.
a. NALE.WAYE DOUBLET ANTEMNA
For top performance, especially on the short-wave
bands, the use of a hali-wave doublet or other type
of antenna employing a 50 to 600 ohm transmission
line is recommended, A typical double! 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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156-001748
Figure 3. Typical Doublet Antenna Installation,
AE nee er
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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 bal-
anced or unbalanced transmission line. When a
balanced line suchas twin-lead or twisted pair is used,
the line connects to terminals Al and A2 and the
jumper link between 42 and GND is disconnected,
(See figure 3.) When using an unbalanced 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 it is
cut. Therefore it may be desirable, for reception
on frequencies remote from the antenna frequency,
to utilize the doublet antenna as a single-wire type.
This is accompiished by connecting the two trans-
mission-line icads together and connecting them to
terminal Al. The jumper link in this case should be
connected between terminals A2 and GND.
in an Installation where the receiver is used in
conjunction with a transmitter, it may be advanta-
geous to use the same antenna for receiving as for
transmitting, This is especially true whenadirec-
tional antenna is used, since the directive effects
and power gain of the transmitting antenna are the
same for receiving as for transmitting, Switching
tne antenna from the transmitter to the receiver
may be accomplished with an antenna-changeover
relay or a knife swiich connected in the antenna
ieads,
For further information regarding antennas, refer
to the Radice Amateur's Handbook orthe A R.R.L. Antenna
Book, both published by the American Radio Relay
League, West Hartford, Connecticut, U.S. A.
2.4, POWER SOURCE.
The receiver is designed to operate directly on
105 to 125 volt, 50/60 cycle AC current. Insert the
power cord into any convenient AC power outlet of
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 at the rear of the receiver for
connecting the external speaker that is required
with the receiver. (See figure 4.) Any permanent-
magnet speaker with a 3.2-0hm voice coil can be
used by simply connecting the two leads from the
speaker voice ¿cali to the terminals marked
3.25PKR and GND.
Hailicrafters' Model R-48A Speaker is designed
for use with this receiver and may be connected ta
the terminals marked 3.7SPKR and GND.
2-6. HEADPHONES.
The headphone jack, marked PHONES, islocatedon
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 18 not critical and any headphones ranging
from 50 ohms to 5000 ohms will provide satis-
factory performance,
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Figure 4. Rear View of Receiver.
TI CATHODES OF KE
AMPLIFIER AND SC KC
TF AMPLIFIES
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1650 KC IF @ o,
AMPLIFIER STANDBY А ‚
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156-001637
Figure 5. Remote Receive-Standby Circuitry,
2-7. REMOTE RECEIVE. STANDRY 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 ihe receiver with the remote switch, the
jumper link must be removed, The switchor relay
should be 50 wired that the contacts will be closed
in Receive and open in Standby,
3-1. GENERAL.
‘The controls discussed in this section are identi-
fied in figure 9, Before operating your receiver
take time to familiarize yourself with these
controls, their positions on the panel, and their
functions.
3-2.
The EF GAIN control varies the gainofthe RF amp-
iifier 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.
The BAND SELECTOR control operates the band
switch to place the proper setof coils into the cir-
cuit to cover the desired frequency range. The fre-
quency range covered by each position af the BAND
SELECTOR controlis indicated directly on the panel,
BAND SELECTOR.
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-írequencey end of the dial and may
not give a definite peak, Thisis anormal condition
and does not indicate improper alignment,
halficratiers
RE GAME BAND SELECTOR
5,5
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2.5
SELECTIVITY
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SANDSPREAD” -
MODEL SU=172
BR. FURCTION
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PHONES
Figure 6,
156-001699
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 elecirical interference. The limiter circuit
allows the signal to pass unaffected through the
receiver, bul 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., it automatically adjusts itselfto the
signal level).
The noise limiter circuit cheps noise peaks ге-
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.
à Connects the AM detector to the audio ampli-
fier and disables the BFO,
3. Connects the product detector to the audio
amplifier, energizes the B¥O and switches in
the slow release AVC components.
38. SELECTIVITY.
3 SE ‘The SELEC TIVITY control is used to vary the selec-
| “tivity- of the" Teceiver to fit receiving conditions,
“Three degrees Of selectivity are available: 0.5 KC
e [ 5: for CW. reception under crowded-band conditions,
0025 KC Tor: 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 2 at’ 6 DB down... ~
KC OFF HESONANCE
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Figure 7. IF Selectivity Curves.
The receiver IF selectivity curves are shown in
figure 7. Note thatas the selectivityis varied {rom
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.
acded selectivity reduces both adjacent-channel Lu Le
interference and background noise by attenuating ВОЛ
the higher audio frequencies. Too much selectivity
on AM signals, however, Will attenuate The high
audio frequencies to such an extent thatthe signal
may become unintelligible asa result of excessive
sideband cutting, When receiving OW signals, the
sharpest selectivity position (0,5) may be used
without the 1085 of inteiligibility experienced in
AM reception.
39... BEAT FREQUENCY OSCILLA TOR (BR).
The BFC is an inductively-tuned oscillator which
re-inserts the carrier at the product detector {or
SSB or CW reception. The center frequency ofthe
BIO is 50,85 KC and is variable over a range of
+2 KC.
Placing the BTO frequency on the high-frequency
siope of the 1P passband allows frequencies below
the BFO frequency to be accepted through the IF
passband (lower-sideband reception).
Macing the BPO frequency on the low-frequency
slope of the IF passbandallows frequencies higher
than the BFO frequency io be accepted through the
IF passband {upper-sideband reception).
The correct settings for USE, LSB, and CW are
shown on the panel, It should be noted that changing
the BFPO 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 558 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
switeh is set at CAL, the crystal calibrator is
turned on to provide marker signals at every 100
KC on the dial. The crystal calibrator emplovs 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
WWY, This capacitor has been set at the factory
and normally should not require readiustmentun-
less extreme calibration accuracy is required, If
adjustment is required, proceed as outlined in
paragraph 4-77.
NOTE
H the HA-7 calibrator is notused, the
CAL—OFF switch should be left in the
OFF position at all times.
fe
341. TUNING AND BANDSPREAD,
The TUNING and BANDIPREAD conirols are used in
conjunction with one another to tune-inthe desired
signal, Coarse tuning is performed with the TUNING
control and fine tuning with the BANDSPREAD control,
А, MAIN TUNING DIAL
The main-funing or left-hand dial is operated by
the TUNING control, This dial has {ive calibrated
scales, one for each of the four frequency bands
plus a logring 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.
A PORTANT
The readings on the main tuning dial
will correspond tothe station frequen-
cies only if the BANDSPREAD controlis
set at the BDondspread Sel line, Ifitisset
at any other position, ths additional
bandspread capacity added to the main
tuning capacity wili 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 circie dots, When tuning with
the bandspread dial, the main-tuning diai mustbo
set at the dot corresponding to the cesired band.
International short-wave broadcast bands are
indicated by a double line andidentifiedin meters,
DB. BAMDSPREAD DIAL
The bandspread or rigni-nhand dial is operated oy
the BANDSPREAD control, This dial contains five
scales calibrated for the 80, 40, 20, 15, 10 meter
and citizens bands. These five scales are cali-
brated to read receiver frequency directiy 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.
: “The first method of fine tuning isusedwhen
“it is desired to tuhe in a single signal with
—. precision accuracy. First the BANDSPREAD
“x control is set a few degrees from its Band-
spread Sei 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
Зотов Не left and right) until the signal is loudest
and clearest,
AM RECEPTION.
Set the front panel controls to their starting
positions as outlined below.
CRFGAIN ooo 10 (maximum sensitivity).
© BAND SELECTOR. ..........At the desired band,
CUAUDIO GAIN. 111111100000 2
ANTENNA В Peak on signal.
SANLOFE 11111000 OFF.
В OFF,
SELECTIVITY LL 11114401 12.50r 5,
LA, OFF,
Æurn the receiver on by rotating the FUNC.
TION control clockwise to AM. The tuning
dials will light up, indicating the receiver is
Operative, Rotate the AUDIO GAIN control
clockwise for the desired volume level,
… Bet the bandspread-tuning gang near mini-
- mum capacity by rotating the BANDSPREAD
> control to Bandspread Set, Toutilize the BAND-_
“SPREAD control as a fine tuning adjustment
“for the short-wave bands, refer to paragraph
11,
IMPORTANT
The calibration on the main-tuning
left-hand) dial will be correct only if
he bandspread- tuning gang is set at
andspread Set. If it is set at any other
sition, the additional bandspread
apacity added to the main-tuning
pacity will mis-calibrate the main-
ng d dial.
to the desired signal with the TUNING
ot, “tuning for maximum clarity. After
signal has been accurately tuned in,
18 the AUDIO GAIN control as desired.
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
NOTE
The S meter Will not give a true indica-
tion of the IF selectivity because the
AYC bandwidthis approximately twice
as wide as the signal bandwidth atthe
detecior,
When tuning an AM signal, it will be
found convenient to tune the signal with
the SELECTIVITY set at 2.5 and then
turn the SELECTIVITY controlto Safter
tuning in the station.
D, Set the SELECTIVITY control for the desired
degree of selectivity. For standard-broad-
cast reception (Band 1), the control is nor-
maliy set to 5 for maximum fidelity, The
positions marked 2.5 and 0.5 provide рго-
gressively increasing steps of selectivity,
Note that as the selectivity ofthe 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»
guently be preferable to sacrifice natural.
ness où 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 may be necessary
to center the signal in the IF passband.
6. Use ANIL (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-
quentiy re-inserted by the receiver's BPO andthe
signal is detected in the same mannerasa single-
sideband signal,
Controls should be set as for SSB reception.
Hither USE or LSB may be used.
4-3. SINGLE-SIDEBAND RECEPTION.
1. set the front panel controls to their starting
positions as follows:
REGAIN 1111111140 10 (maximum sensitivity).
BAND SELECTOR ..... At desired band.
AUDIO GAIN 11211200 Approximately 2,
FUNCTION ee SSB/CW.
BFO a Usually LSB for 40 and 80 meters
LSB for 20, 15, and 10 meters,
SELECTIVITY ........25..
ANTEN a Peak on signal.
TUNING oo. Set at desired index dot if tuning
Ee amateur band.
BANDSPREAD . As desired.
Siowly 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. I should be remembered that this will
reduce AVC and also affect the $ meter reading,
4-4. CW RECEPTION.
Set all controls as shownin single-sideband recep-
tion except for the BFO control which should be
set to the CW position. | 5
8.
Under crowded-pand conditions, it may be found
desirable to set the SELECTIVITY switch to the 0.3
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 dialcali-
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.
А. CALIBRATION OF THE BANDSPREAD DIAL
1. Set the bandspread-tuning dial at à conven-
ient multiple of 100 KC atthe 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.
à. Set the main-tuning dial to the index dot of
the desired band.
3. Set the FUNCTION switch to SSB/CF, the BFO
switch to CW, and the CAL-QFFswitehto CAL.
4, Very carefully adjust the TUNING control for
the exact frequency asindicatedby 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.
2. The procedure outlined in Steps 1 through 4
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 highendofthe
band as in Step 1.
В. CALIBRATION OF THE MAIN TUNING DIAL
1, Turn the BANDSPREAD control counterclock-
wise until the dial pointer is aligned withthe
index marks at the high-frequency end of the
dial (Bandspread-Set line).
2, Set the main-tíming dial ata convenient mul-
tiple of 100 KChnear the desired frequency or
range of frequencies. {The main-tuning dial
is calibrated in MC.) Todetermine thenear~
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 à, 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.
4-5. USE OF THE 5 METER.
The § meter provides avisual means of determining
whether or not the receiver is properly tuned, as
well as anindication of the relative signal strength,
ihe5 meter circuit consists ofa DC milliammeter
connected in series with the cathode lead to the
1050-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 S meter is calibrated in S units
from 1 to 2 and in decibels above 5-9. The indica.
tions on the $ meter will be correct only when the
RF GAIN control is setat 10 (maximum sensitivity),
NOTE
if the НЕ GAIN control is set at 3 re-
duced position, the S meter may read
below zero under no signal conditions.
This 18 a normal condition,
4-7. CRYSTAL CALIBRATOR CHECK.
The Crystal Adi. control onthe optional Model HAY
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
VWY, This capacitor has been set at the factory
=, and shouid not require readiustment unless ex-
treme calibration accuracy is desired. If adjust-
“ment is required, proceed as follows:
Set the FUNCTION switch to AM, the CAL-OFFswiteh
+ 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 WWYV 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
WWY, If the adjustment is attempted during per-
iods that WWY 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,
Zor further information regarding operation
or servicing of this equipment, contact the dealer
irom whom the unit was purchased. The Halli-
crafters Company maintains an extensive system
of Authorized Service Centers where any required
service will be periormed promptly and efficiently
al 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 fails
within the terms of the warranty, It is necessary
to present the Bil-of-Sale in order to establish
warranty status, After the expiration of the war-
ranty, repairs will be made for a nominal charge,
All Hallicraîters 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
uniess 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,
TO
Ji
HA-7
SOCKET >.
RIGO
METER ZERO
REIS
METER
SENSITIVITY
Y |
SDCO
O5 18 ——
CHA —
BANDSPREAD|
C3C
C38-
pee
e 5
a re on a
i dra
va
GC4
—— V2
BAUS
ALIGNMENT
POINT ©
CÍA
TUNING
Figure 8. Top View of Chassis,
156-091759
Sree нара на
SECTIO
Output meter (or AC scale of Y TYM), Connect
output meter to appropriate speaker output
terminais, If a VTVM is used, connect it to
terminals 3,7 SPKR and GND and terminate 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
i been tampered with or component parts have been rat im
; . | 5-2. INITIAL CONT .
| replaced in the RF or IF stages. Alignment should ‚ CONTROL SETTINGS
be performed only by persons familiar with com- Band Selector . ae... As indicated in chart.
munications receivers and experienced in their
alignment. Refer to figures 8 and 9 for location of RF and AUDIO GAIN 2 14242210 10 (maximum)
all alignment adjustments,
ANL OFF aa... as OF}
1. EQUIPMENT REQUIRED. FUNCTION Lo... AM.
Signal generator covering 50 KC to 30 MC,
Selectivity 1142 1121411114 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 Ee REMARKS |
CONNECTIONS | FREQUENCY | SETTING :
50-KC IF ALIGNMENT |
1 | Highsideto B0 KC 0,540to ¡YTYM DC 0.5 KC ¡Remove first conversion oscillator :
alignment (unmod) | 1.60MC | probe to tube V3 from its socket to prevent É
point À alignment signal interference, Adjust top slug |
{terminal 2 point B of T6, T5, T4, and T3 (50-KCIF's) -
of T2). Low {junction of for maximum indication, maintain. |
side to R55,R56,and ing approximately one voli reading ;
Chassis, C84). Common on YTVM, -
to chassis, -
1650-KC IF ALIGNMENT
2 | Highsideto | 1650 KC | 0.540to | Output meter 5 KC ¡Replace tube removed in Step 1. |
alignment (mod) 1.60MC | across spea- Tune generator slowly through 1650 ;
point C ker terminais, KC to determine IF passband, Then N
(stator of (VTVM to set generator to center of passband, ©
section C3B alignment using sufficient generator output to a
of main point B if it obtain approximately 1/2 watt re- о
tuning gang). is desired ceiver output and adjust the top and |
Low side to to monitor bottom slugs of T2 and T1 for max- i
frame of detector imum response. Tune through the |
gang. voltage.) passband and observe the shape of ©
the response. If it is symmetrical, i
the adjustment is completed; if not, |
reset the generator frequeney near о
the center of the passband and re- о
>. peak T2 and Ti. о
IF SENSITIVITY CHECK |
à | With the generator modulated 30% at 400 cycles and connected through a 0.05 4 F 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 КС).
6 C45 L7 (47 Cel C62 Lo C61 LID
SED RET. se ee = = Er BAND
CNT», EAS CET | SELECTOR
1.4
соо
Ce
ANTEMNA
ES чз
ALIGNMENT] — * [e a RE
POINT A О ты RE о
156.001960
Figure 9. Bottom Chassis View.
Before proceeding with the RY 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 to 10 (maximum),
ANT -OFF to OFF, SELECTIVITY to 2 2.3, FUNCTION
to AM, and BANDSPREAD at Bandspread Set.
RF ALIGNMENT
Connect the output meter across the speaker
terminals, {Connect the YTYM to alienment
point 5 if it is desired to monitor the de-
tector voltage.) Maintain a 1/2-wattreceiver
output,
Connect high side of generator through a
330-chm carbon resistor to antenna terminal
A1, low side to A2, Connect jumper between
AZ and GND.
The oscillator frequency is higher than the
signal frequency on all bands.
-4. S METER CALIBRATION.
To adjust the Meter Zero the antenna should
be disconne ected and the receiver antenna terminals
orted; LEE Ma on,
ajust. ‘the Meter Zero potentiometer (R18) on
apron of the chassis until the meter
directly over the last calibration mark
ie left side of the meter scale. With this
made; ‘if the RF GAIN is rotated counter -
h meter may read below zero, Thisis
BAND GENERATOR AND ADJUST FOR
STEP SELECTOR RECEIVER
SETTING FREQUENCY MAXIMUM
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 18 (mixer slug), and
14 (antenna slug)
5 4.8 to 12.8 11.5 MC C80 {oscillator trimmer),
MC C49 {mixer trimmer), and
С? {antenna trimmer)
4.8 to 12.8 5.0 MC Lil (oscillator slug),
MC L7 (mixer slug), and
13 (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 L110 (oscillator slug)
MC
7 0.54 to 1.69 1.4 MC C82 {oscillator trimmer),
MC C47 {mixer trimmer), and
C2 (antenna trimmer)
0.54 to 1.60 0.5 MC C71 foscillator padder)
MC
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. Set generator to 14.3 MC and 50 micro-
volts ne
D, Place SELECTIVITY switch to the 2
Don F UNCTION to AM and care-
fully tune receiver for maximum S meter
deflection at 14.3 MC,
13
Cc. Peak ANTENNAtrimmer (C2).
d. If the meter does not read $9 adjust
Meter Sensitivity potentiometer (R13)
near top center of chassis for read-
ing.
e, Recheck Meter Zero setting and repeat
adjustments if necessary.
5-5, BFC CALIBRATION,
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 (CY position), the beat-note frequency
should be between 700 and 1000 cycles and zero beat
snould occur with the control rotated approxi-
mately {forty-five degrees clockwise fromthe cen-
ter position.
if the control is far from iis correct setting, it
may be roughed in in the following manner.
1. Remove the ВРО knob and the adapter
bushing from the BIO 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 with a symmetrical
rise in pitch in either direction from this point,
With the shaft set at the point of lowest audio
noise pitch, replace the shalt bushing withthe iong
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 1,50 MC —
2 1,75 to 49 MC 800
4.8 {0 12.6 MC 40M
4 12,5 to 34.0 MC 20, 15, 10M,
Citizens Band
TURES
Nine plus voltage regulator and rectifier.
SPEAKER OUTPUT
3.72 ohms
HEADPHONE IMPEDANCE
50 to 5000 ohms.
ANTENNA INPUT IMPEDANCE
50 to 600 ohms,
POYER SOURCE
105 to 125 volts, 50/60 cycles.
POWER CONSUMPTION
85 watts,
RECEPTION
AM, CW, and SSB.
14-
INTERMEDIATE FREQUENLIES
(Double Conversion): 50 EC and 1850 КС.
DIMENSIONS (overall) (HWD}
8 Бу 18-3/4 by 9-13/16 inches {HWD).
SHIPPING WEIGHT
32.1/2 pounds,
MET 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 § 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 botiom screws and slide
chassis forward through front of cabinet,
VE vs 1/3 V8
ZND MIXER 50 KC IF AMP DET
EBLE 8 8A6 1/3 68N8
CT if 17
| А К
> ) rá NE
\ A
А
Pa
Г. oi
В +
156001905
Figure 10. Equivalent? Schematia Diagram of SO.KC IF System.
IMPORTANT 6-5. DIAL RESTRINGINO,
The bandspread gang restringing (figure 11) may
be accomplisned without removing any parts,
turn and lift cover. Do not attempt to Before starting, attach the tension Springs to tne
remove these screws. >” — cable, rotate the BAN List REAL contr où snob fully
clockwise, and set the bandspread gang in its
closed position. Attach the spring at one endof the
cable to position 1 onthe pulley as shown in figure
11 and follow the stringing sequence 1 through Y,
To remove the top cover, turnthe four
screws counterclockwise one quarter
To remove the bottom cover, remove the four
inner bottom Screws,
6.4 TUBE AND DIAL LAMP REPLACEMENT. Alter stringing, check to see il the cial scale fines
up with the pointer when the bandgpread gang is in
To gain access tothe tubes and dial lamps, remove its closed position, If the index marks onthe scale
top cover (see IMPORTANT note above), See label do not line up, loosen the set screws holding the
on the inside rear of cabinet for tube location, dial to the shail and rotate to nroper position.
- 156-001841
Figure 11. Restringing the Bandspread Gang,
-15
3-1/2 TURNS
NN
MAIN TUNING
HANDSPREAD
156-007849
Figure 12. Restringing the Main Tuning and Bandspread 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 onthe pulley as shown in {igure
12 and follow the stringing sequence 1 through 7.
6-6. YOLTAGE 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, |
vs
SEMA
ANTENA =
LW AMPLIFIER
М! E va VE VE AYC RECTIFIER
DCE AUS SDC6 SALA BAS AM DETECTOS
RF FIRST 1859 KC SECOND MIXER 50 KE
AMPLIFIER MIXER EF CRYSTAL EF с
AMPLIFIER OSCILLATOR AMPLIFIER ANE
sun me DIODE
> Ч pd A > A —
* |
! a a ОМИ НЫ eb o dir |
| & | а Le
B ê
| | |
i
A | AVC |
| bh AE —
|
| ht
— B/CW
Г 7 1 558/C AM
I ! = A
ba ml Tr N МЕРЫ
HA-7 v3 3
CALIBRATOR ECA
VARIABLE ит
OSCILLATOR DES A 49
_ 6.3.0.8
УГУ ÊT + + CTO eo mm Чай
PROGUE aon EE 8 AUDIO AMPLIFIER
VEG ME ce В AUDIO OUTPUT
5Y3 Эд?
RECTIFIER VOLTAGE |
REGUL ATOR serakem | SD
e | |
PHONES QI
156-1438
Figure 13. Block Diagram of the Model 3X.722 Receiver.
17
156-001745
“ICA CEN AD
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Figure 14. Yoltage Chart of Receiver.
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FR —
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SECTION VI
100-KC CRYSTAL CALIB
MODEL HA
Y 30]
IO KC
CRYSTAL
Y EOI
SLUG
CAO! me
CRYSTAL
ADJ,
| 156-00203%
Figure 16. Model HA-7 100-KC Crystal Calibrator.
7-1. GENERAL.
The Model HA-T7 100-KC Crystal Calibrator is a
srecision-built accessory which provides marker
signals at every 100 KC on the dial ofthe SX-122
enabling the operator to check calibration ac-
curacy. The HA-7 is placed into operation by
plugging it into the appropriate socket (J1) on
the receiver chassis (see figure 8)andyplacing the
front panel CAL - OFF switch in the CAL position
(refer to paragraph 3-10).
IMPORTANT
The CAL -OFF switch should be returned
to the OFF position after calibration to
prevent spurious siznal generation.
-1
7-2. ADJUSTMENT.
À trimmer capacitor, adjustable by the Crystal Ad]
control on the ton of the calibrator unit, permis
adiustment of the calibrating crystal to exactly
100 KC by comparison with the [requenciestrans-
te cd by station WWY, This ca *pacitor has been
et at the factory and normally should not require
r readjustm ent unless extreme cc; alibration accuracy
is required, If adjustment should be necessary,
proceed as outlined in paragraph 4-7 of this
document,
PARTS LIST
SCHEMATIC HALLICRAFTERS
SYMBOL DESCRIPTION PART NUMBER
10G-6KC0 Crystal C alibrator
Assembly (Model HA-7)
СЗО Capacitor, Var sable. 8to 044200437
SO ULF, Crystal Adi.
C302,304 Capacitor, 0,01 pF, 500Y, 047-100224
Ceramic Disc
001-004394
303 Cap acitor, BZ ны ©, 170-213820
10%, Mica
CR301 Diode, Tvpe 1N295 019-301950
E301 Plug, 5-Pin (Connects ta 29235-100038
J1 on SX-122)
R301.304 Resistor, 2ZUK Oums,
10%, 1/2 watt. Carbon
451-252224
R302 Resistor. 4700 Ohms. 10%, 451-252472
1/2 watt, Carbon
R303 Resistor, 100K Ohms, 451-252194
10%. 1/ 2 watt. Carbon
v301 Electron Tube, Type 6AUS 090-9005805
УЗО Crystal. 100-KC Marker 0166-20235]
Shield. Cover G59-001718
Socket Crystal (Y301) 008-200296
Socket, Tube (Y301) 006- 100758
I00-KC CALIBRATOR —
Figure 18. Schematic Diagram, Mode! HA-7 Crystal Calibrator,
156-262050
De UTERINA NN TE EE AED rte
DPI TLCAN ÓN EEE EEE LND LATA AAN A
A VA IRA RS NA A A II A
Y | Y? V4 VEA VAR cea vs с Y 7
6DC6 — BAUS 6DC6 1/2 6BL8 1/2 6BLE8 390 6 BAS 390 — БВЕб
RF AMPLIFIER FIRST MIXER CHO KC IF AMPLIFIER SECOND MIXER CRYSTAL OSCILLATOR A | SOKC TF AMPLICIER AY BF O/PRODUCT
co : | c32 DETECTOR
530 car.
| | _ | —_ 0.001 T
| E 2 Sh a Te ¡esoxc 182 C33 21T6 | cas VF De
7 2 | 9 pi 2297707 == >
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ca Re = À M R73 s Heb 7» us [77% ; | | ; 1 | R32 све 2 OT sexi
220 22 _ 00K] 5 = - von J L. To 1 R35
. 3 ; — CIS 4 4 ET 3 100K
T 20 _ LS R33 1 0. ca
; | ; — { iR22 + Г’ rele 1330] uF
| © | | TIOOK © cop увез less © 22000) |
RIA R3 1 84} C5. RS св. 27 1 10 pre | Cali MIO) ci RIO RI2 cie R154 Cid $RI7 RIOS TT 20 [2200 oo? +
> $ > * т = т * $ * 7 У > i 120 T ; Hind à
1 3 15 7 1807 002 T 33k1 0005T ню 2200300057 220KY 0.005 T 13300 100KT T0.005 1507 94 T 733K 1500 ; = UF | | ОИ
MEG | UF # W UF € UF | UR O UF UF LM | 7823 Г RIO Г”
+ 3300 C367 st +
330
+270 A | - _
VDC £26
oul ¿Rea +602 |
E e | TU
= 2W
R25
22K
IW
в 8
METER | oí 1 =
; SENSITIVITY
; SENSITIVITY | SENSITIVITY
1 ;
AVC AVC | AVC м
de tec i : R31 cas
nn. TOO | о 5 | IGOK T 0.47
| +270YDC = UF + 270 VDC | ‚ +270 VDC | 4
1 ? 8
| +150 VDC REGULATED N _ | . :
Lo | R42 C76 | R44 -
Eo - _ BANOSPREAD | cr or 3 de R43} | ¡OK herr :
i М 3 | bg SK? 3 = А
o ; К UF 5 | 250V. :
Do | V3 cs ;
: ade я 8364
7 ; = | Blé 10 T Yi 100K |
и ,5 FIRST Од? : fr
| „ e C5IA 073 “CONVERSION | VOLTAGE , fi
X 2 10 — JOSCILLATOR | REGULATORÍ 2,11
cio 7 e mr mmm mm me mm 00
I | | 5503 à C9) ==
| | 2207 | 0.001 1
| ce {| 1 | ; ; ; ; uF
he | | > . ; В м
с | £82 | : | 435
100 1 | | 0.02. Rao Oi mses 820K
if | UF T 220KT VE o] у ЭВ
2 a Aa 286 | | Ras / 1/2 6GWB8
2 BAND 3 £80 ¿Ral 22K ; S8N8 de ces FIRST AUDIO AUDIO OUTPUT
= if TECK ^^ AVC ces rt AVC AM | RS7 E 470 /
ze eS = 1568 1 | AMPLIFIER 90075 \RECTIFIER DETECTOR 180K | 4 /
5 251 обет $ 3.9 cac. UF - BLUE YEL
4 и EE + 220 100K / 2.005 E 695 _
rn it NOTES: E m TT TT i / UF ; 0.01 T
1. UNLESS OTHERWISE SPECIFIED: Sn / SH — UF RED] | BLK
© A ALL RESISTORS ARE IN OHMS, 10 %, 1/2 WATT. L (Re e ey EN cos
LIO Ces 220K 3 : 2 N / i 2 470
BAND 2 10 | B, ALL CAPACITORS ARE IN MICROMICROFARADS [UUF) 3 | ñ 5 3
a = К SEE PARTS LIST FOR VOLTAGE RATINGS. . / AUDIO] LAMES
3 — 4 ] Ë 3 $
5 TE TE ses 2. ALL SECTIONS OF BAND SELECTOR SWITCH SI ARE GANGED JBL] Ras eso / GAIN Reo + „3878 e
al 55 | 280 TOGETHER ON A COMMON SHAFT. UR 1500 — 1220 / J |
I 3, THE POWER ON-OFF SWITCH IS PART OF FUNCTION SWITCH : | / 2 -
+ E | | S4 (COMPLETELY COUNTERCLOCKWISE POSITION). | / |
1% -
сто 4, [C7 SIGN! FIES FRONT PANEL MARKINGS. | +270VD : 7 + 270 vc
BAND | 5. BAND SELECTOR SHOWN IN ,540-1,60 MC POSITION. | + /
+ - a 6. SELECTIVITY SWITCH SHOWN IN 5,0 KC POSITION. | / cea res
Te eee fig | 7. FUNCTION SWITCH SHOWN IN OFF POSITION, | , T о. PHONES] 7 ]
1+270VDC 30 150 o | Je Ва
if j
de ie | | RES RES |
A в / / oK REMOVABLE 1
O +A : | м ; 5) TB2
FTC | - / (R F_GAINJ JUMPER E
\ = . or 3.24
* | | / SPEAKER
‚869 :
1500 | - /
Reg SW /
300
sw /
: = ESA } / 155- 000004
= 450V _ /
Figure 18. Schematic Diagram, Model SX-122 Receiver.
Y | v2 y à \ БА — YBEB £23
Ss DCO SAUS £DCE 1/2 6BLB 1/2 6BLE 390 m
RF AMPLIFIER FIRST MIXER I650KC IF AMPLIFIER SECOND MIXER CRYSTAL OSCILLATOR — Е —-
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CALIBRATOR SENSITIVITY SENSITIVITY
SOCKET ;
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DEF , [
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NOTES! ;
- 1. UNLESS OTHERWISE SPECIFIED. я
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HO Band 2 10 B. ALL CAPACITORS ARE IN MICROMICROFARADS {UUF) : —
Cs 8 y SEE PARTS LIST FOR VOLTAGE RATINGS. |
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| all E TOGETHER ON A COMMON SHAFT. or 1500 DE
$ К 2 THE POWER ON-OFF SWITCH iS PART OF FUNCTION SWITCH =
+ и 7" 54 {COMPLETELY COUNTERCLOCKWISE POSITION.
o 675 4, {III SIGNIFIES FRONT PANEL MARKINGS, +270 VDC
cB BAND I 220 5. BAND SELECTOR SHOWN IN .540-1.60 MC POSITION. | ‚
— - 6, SELECTIVITY SWITCH SHOWN IN 5.0 KC POSITION.
Di > PT Tee? Te. : 7. FUNCTION SWITCH SHOWN IN OFF POSITION,
T8 +270 VDC 301 160 |]
GAN pate : | 7 a
5Y3GT 672
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105. 125 BLK RED RECTIFIER E 10
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Figure 18. Schematic Diagram, Model SX-122 Receiver.
Figure 18. Íchema
SCHEMATIC
SYMBOL
C1,25,33,
42 45 52
с?
C3A,B,& C
C4 43,85
C5,18,21,
26,28,34,
40,82
C8,9,10,11,
12,4478,93
C7,8,35
C13,15,22,
84,92,95
£14,29,39,
41,94
C18,30
C17
C18
C20
023,24,
31,32
C27,37,80,
81,83,90,
91,98
C38
C48 49,62
C50
C51A&B
C53,74
Ces
C70
ci
C72
C73
C75
C77
C78,87
C79,88
C86,98
C89
Сет
C99
A,B&C
£160
DESCRIPTION
CAPACITORS
2.2 uu Е, 10%, 500 М, Composition
Variable, 4.65 uu F to 57 uuF,
ANTENNA Trimmer
Variable, TUNING
220 uu F, 5%, 500 V, Plastic Mica
0.02 и Е, +80%, -20%, 500Y,
Ceramic Disc
0.005 uF, +80%, -20%, 500V,
Ceramic Disc
10 ju F, 5%, 500V, Plastic Mica
0.01 uF, +80%, «20%, 500V,
Ceramic Disc
0.1 uF, +B0%, -20%, 50V,
Ceramic Disc
100 vu F, 5%, 500 V, Plastic Mica
47 uE, 5%, 500Y, Plastic Mica
20 uu Y. 5%, 500Y, Plastic Mica
120 uu F, 5%, 500V, Plastic Mica
390 uu F,5%, 900V, Plastic Mica
0.001 u F, 20%, 500V,
Ceramic Disc
330 Lu F, 5%, 500Y, Plastic Mica
1000 uu Y, 5%, 500Y, Plastic Mica
25 uu F, 10%, N750,
Ceramic Tubular
Variable, Trimmer, Louu? to
iSuuF
Variable, Trimmer, 3 uu F to
З0 ны Е
Variable, Trimmer, éuu F to
80 uuF
Variable, BANDSPRE AD
100 vu F, 10%, N750,
Ceramic Tubular
7 uE, 40,25 ULF,
N1500, Ceramic
5 uuF, +0.25 ULT,
N3300, Ceramic
11 zu F, 5%, N1500, Ceramic
Yariable, Trimmer 4.541 F to
25 НЫ Е, РО
Variable, Trimmer 2.5 up ¥ to
13 pu ¥F, NPO
Variable, Trimmer, 45uu¥F to
25 LuF, NPO
1000 uu F, 5%, 500V,
N2200, Ceramic
1300 vu F, 5%, 500 V, Plastic Mica
100 ди Е, 10%, NPO,
Ceramic Tubular
880 uu E, 5%, 500Y, Plastic Mica
320 ды Е, 5%, №750,
Ceramic Tubular
10 uu F, 19%, NPO,
Ceramic Tubular
240 uu F, 5%, 500V, Flastic Mica
220 ни Е, 5%, №830, = =
Ceramic Tubular
Variable, Trimmer, 118 uu F to
160 ны Е
10 ци Е, 0.9 НЫЕ,
№3300, Ceramic
1,0 uu F, +0.) uuF,
N2200, Ceramic
1.0 up ¥, 10%, N750,
Ceramic Tubular
12 uuF, 250V, Electrolytic
4700 uuF, 5%, 200Y,
Paper Tubular
0.01 uF, 5%, 400V,
Paper Tubular
470 pu F, 5%, 500V, Plastic Mica
0.47 uF, 10%, 200V
Paper Tubular
10 oF, 25V, Electrolytic
60 u F, 450V; 20 uF, 450V;
20 uF, 400V; Electrolytic
5 ju F, 5%, 500V,
Plastic Mica
HALLICRAFTERS
PART NUMBER
547-200403-04
048-000546
0484000547
493-110221-234
047…100242
047-101381
483.110100-231
D47-100217
047-001146
493-110101-234
493-110470-233
493-110200-231
493-110121-234
493-110391-234
047-101871
453-110331-234
493-310107-234
491 -906250-95
14-100599
044-100396
044-100395
048-500548
401 -026101-94
47989-011070
479.031050
479-015110
044-200453
044200452
044-200851
047-200441
493-310132-234
491-056101-22
493-310881-234
491-065321-G4
491 -006100-22
493-110241-234
491.005221-73
044-100398
479-0321900
479-220010
491-005010-94
045-001121
046-001312-03
045-001318-03
493-110471-234
046-001302-04
045-000034.
045-200113
493-110050-231
SE
SCHEMATIC HALLICRAFTERS
SYMBOL DESCRIPTION PART NUMBER
* RESISTORS
Ki, 26,560 1 Megohm 451-252195
EZ 22 Ohms 451252220
R3,7,14 15 Ohms 451-252150
ná 180 Ohms 451-252181
15,17 33K Ohms, 1 watt 451352333
R6,12,22, 160K Oluns 451-252104
31,35,36,58
RÁ 2.2 Megohms 451 252225
9,23 2200 Ohms 451.252222
810,47, 220K Ohms 4512582224
49 50,62
Ri1,29, 3300 Ohms 451-252332
38,39
R13 Variable, 2 Megohms, 30%, 025-001957
1/4watt, Meter Sensitivity
El 150 Ohms 451252151
R16 Variable, 400 Ohms, 30%, 025.002293
1 wait, Meter Zero
Ris 120K Ohms 451-252124
219,48 1500 Ohms 451-252152
H20 4700 Ohms 451-252472
R21,28, 22K Ohms ‘ 451252223
41,45
R24 АК Ohms, 2 walls 451-852473
R25 22K Ohms, 1 watt 451-352223
R27 100 Ohms 451-252101
R30,32 47K Ohms 451-252473
R33 330 Ohms 451252331
Rad 88K Ohms 451 -252683
R37 B00 Ohms, 1 wall 451-352682
R40 3300 Ohms, 1 watt 451-352332
R42 10K Ohms, 1 walt 451 -352103
R43 BE Ohms, 5 watly wire wound 445-012602
R44 LOK Ohms 451 ~252103
R48 3.8 Megohms 451-252395
R51,53 220 Ohms 451252221
RAZ 54 390 Ohms 451-252391
R55 820K Ohms A51-252824
R57 180K Ohms 451-252184
H58 10 Megohms 451-2521086
R60 Variable, 500K Ohms, 307%, 025-002254
1/8 watt, AUDIO GAIN
REI 15 Megohms 451-2521586
Ras 580K Ohms 451-252684
Rad 150 Ohms, 1 watt 451-352151
R85 Variable, 10K Ohms, 20%, 125-002253
1 watt, RF GAIN
HEH 330K Ohms 451-252334
R67 47 Ohms, 1 watt — 451-352470
RES 300 Ohms, 5 watts, wire wourid 445-012301
Res 1500 Ohms, 5 watts, wire wound 42445-012192
* All Resistors are carbon type, 10%, 1/2 watt,
uniess otherwise specified.
Li
L2
L3
L4
LS
L6
17
L8
LA
Lio
Lil
112
T1,2
T3,4,5,6
VO
COILS AND TRANSFORMERS
Coil, Antenna, Band l
Coil, Antenna, Band 2
Coil, Antenna, Band 3
Coil; Antenna, Band 4
Coil, BFC
Coil, Mizer, Bands 1 and 2
Coil, Mixer, Band 3
Coil, Mixer, Band 4
Coil, Oscillator, Band 1
Coil, Oscillator, Band 2
Coil, Oscillator, Band 3
Coil, Oscillator, Band 4
Transformer, 1850-KC IF
Transformer, 50-KC IF
Transiormer, Output
Transformer, Power
ELECTRON TUBES AND DIODES
Tube, Type 6DCE
Tube, Type SAUS -
Tube, Type 8C4 Ш
Tube, Type 6BLE
Tube, Type 6BAS
Tube, Type 6BES
Tube, Type 6BN8
950 -000952
050-000057
050-000954
- -050-000955
‚.054-000059
051-201319
051-201326
051-201327
. 051 -201328
051-201921
G51-201933
051-201321
050-000788
050-200489
055-000519
052-300221
080-901328
_ 980-200808
— 090-900830
-. 090-901350
030-9011172
—. 090-901124
- 090-001465
SCHEMATIC
SYMBOL
DESCRIPTION
HALLICRAFTERS
PART HUMBER
ELECTRON TUBES AND DIODES (CONT)
VO
Vio
vil
Cri
Si
514
SiB
sic
sim
32
53
55
Yi
Jz
Ml
DS1,2,3
Ji
TB1,2
Tube, Type GWE
Tube, Type SY3GT
Tube, Type OÂZ
Diode, Type 10458
SWITCHES
Rotary, BAND SELECTOR
Wafer, Oscillator
Wailer, Oscillator
Wailer, Mixer
Wailer, Antenna
Slide, SPDT, CAL-OTF
Botary, SELECTIVITY
D90-001502
090-B01111
090-900001
019-002964
082-200055
062-200054
082200053
082-200053
060-002548
0680-00262
Rotary, FUNCTION (Inc. ON/OFF) 060-002628
Side, SPDT, ANL-OFF
MISCELLANEOUS
Bracket, Meier Mounting
Cabinet
Cabinet Bottom Assembly
Cabinet Top Assembly
Clip, IF Transformer Mounting
Core, Coil Tuning (L3-4-7-8-10)
Core, Coil Tuning (18)
Core, Coil Tuning (111)
Core, Coil Tuning (112)
Core, Coil Tuning (T3-4-5-5)
Crystal, 1700 KC
Dial Cord, Bandepread Gang
Dial Cord, Tuning and
Bandspread Dials
Dial Scale, BANDSPREAD
Dial Scale, TUNING
Escutcheon, Front Panel
Feet, Plastic Mounting
Flywheel
Front Panel
Fuse, 2 Ampere, S/B |
Fuse Holder (Inc. Hardware)
Glass, Dial Window
Jack, PHONES
Enob, TUNING
and BANDSPREAD :
Knob, RF GAIN, BAND SELEC-
TOR, ANTENNA, AUDIO GAIN
280-002548
D67-011850
055-004055
150-006769
_156-008770
076-003779
077-100068
003-103289
003-101543
- 077-101336
DOS-101831
019-003231
038-000051
038-000049
083-001029
083-001030
007-000871
015-201072
D71-000212-02
088-001 455
039-190428
006-2008 45
022-000711
036-000390
015-001593
01535-001760
SELECTIVITY, BFO, and FUNCTION
Line Cord
Lock, Line Cord
Medallion, Hailicraíters El
Meter, 0-5 МА Defiection
Pilot Lamp, Type NO. 47
Pointer, BANDSPRE AD and
TUNING Dials
Shaft and Index Plats,
BAND SELECTOR
Shaft, Antenpa Trimmer
Shaft, Control, TUNING
and BANDSPREAD
Socket, Accessory (HA-7)
. Socket, Pilot Light
(Bandspread Dial)
Soeket, Pilot Light (Meter Dial)
Socket, Pilot Light (Tuning Dial)
Socket, Tube, Getal (V16)
Socket, Tube, 7-pin
miniature {(V!i-2-4)
Socket, Tube T-pin miniature {V3)
Socket, Tube, 7-pin
miniature (V5-7)
Socket, Tube, 7-pin
miniature {V1i1)
027-100078
D76-100397
007-000850
082-000603
039-100004
082-000600
074-200172
074-002883
074-002878
00565-100186
086-000565-02
DEÍS-000666
D86-000665-01
006- 200205
006-200633
006-001048
006-000946
006- 100644
Socket, Tube, 9-pin miniatures (VB} 006-20087%
Socket, Tube, 9-pin
miniature (V8-9}
Spring, Dial Cord Tension,
Bandepread Gang
Spring, Dial Cord Tension,
Tuning and Bandspread Dials
Terminal Board, Antenna
and Speaker
Tube Shield {V1-2-4}
Tube Shield (75)
006-200493
075-0001358
075000893
088-002461
2£8-000087
069-000855
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