Hallicrafters SX-62A Training manual

GENERAL SPECIFICATIONS
Tubes ............... Fourteen plus v 0 It age
regulator and rectifier
FREQUENCY COVERAGE
Speaker Output .......... 3.2/8/500
Headset Output .......... High impedance
Antenna Input. . . . . . . . . . . For 50 to 600 ohm line
or single wire lead -in
Phono Input. . . . . . . . . .•. High impedance
External Power Connector .. Std. octal socket
Tuning Range .......... See Frequency Coverage
Intermediate Frequency
Bands 1, 2, 3, 4 . . . . ... 455 KC
Bands 5, 6 ........... 10.7 MC
Power Supply ... SX-62A 105-125V 50/60 Cycles AC
SX-62AU 105-250V 25/100 Cycles AC
Power Consumption ...... 120 Watts
BAND
1
2
3
4
5
6
FREQUENCY TYPE OF
RANGE RECEPTION
540 KC -1620 KC
AM/CW
1.62
MC -4.9
MC
AM/CW
4.9
MC -15
MC AM/CW
15 MC -32
MC
AM/CW
27 MC -56
MC AM/FM/CW
54 MC -109
MC
AM/FM/CW
The Model SX-62A/62AU is a sensitive high fidelity superheterodyne receiver covering all of the broadcast-
ing services between 540 kilocycles (KC) and 109 megacycles (MC). The receiver is capable of receiving both the
FM (Frequency Modulation) and AM (Amplitude Modulation) broadcasts transmitted in this frequency range as
shown in the FREQUENCY COVERAGE chart.
A built-in 500 kc crystal controlled calibrating oscillator and adjustable dial pointer permit accurate dial calibra-
tion on the large direct reading slide rule dial. Marker signals appear every 500 kc on the dial scale with this type
of marker oscillator; hence, dial calibration may be held to very close limits over the entire dial scale by comparison
with the marker signal.
This calibration feature of the receiver makes it possible to log the most prominent shortwave stations by
countries directly on the dial. In addition, many of the active communication channels; government, amateur, police,
aviation, etc. are logged by bars to indicate their location on the dial. World-wide reception is accomplished simply
by selecting the desired frequency band (band selector switch) and adjusting the tuning control so that the pOinter
is above the station locating dot.
The receiver selectivity is adjustable to accommodate the broad response required for high fidelity FM and AM
broadcast reception to the sharpest crystal selectivity required for code reception in the crowded channels of the
short wave bands.
The high fidelity tone compensated audio system provides four distinct tone ranges covering full range reception
for entertainment purposes as well as the restricted range required for communication work in either voice or code.
An automatic noise limiter, operated by a toggle switch, permits the operator to reduce the background noise
caused by severe electrical distrubances. Background noise is reduced in the receiver with a minimum of audio
distortion.
A RECEIVE-STANDBY switch permits receiver disabling for short standby periods without having to wait for the
tube heaters to reach operation temperature when reception is again required.
The SX-62A operates from a 105-125 volt 50/60 cycle alternating current (AC) source. A connector for operating
the receiver with external batteries or equivalent power is provided to permit operation in areas where AC current
does not exist. The universal model, the SX-62AU, permits operation from 25 to 100 cycle alternating current
sources operating at voltages ranging from 105-250 volts. The power requirements for your receiver must be
checked carefully. Read over the installation section of this book before connecting to your power source.
IMPORTANT
Your careful attention is especially invited to the installation and operating instructions. They have been provided
to insure the satisfaction you have a right to expect from a Hallicrafters "Precision Built" product. Your receiver has
an unusually high degree of sensitivity necessary to receive weak and distant stations. Careless operation of a high
sensitivity receiver may result in excess noise or background hiss. These undesirable effects can be held to a mini-
mum by careful adjustment of the sensitivity, tuning and tone controls as well as proper selection and arrangement of
the antenna.
Page 3

INSTALLATION·
UNPACKING -Check all shipping instruction tags carefully before removing them.
LOCATION -The receiver is equipped with rubber feet for table top or shelf mounting. When locating the receiver,
avoid excessively warm locations such as near radiators, hot air registers, or confined dead air spaces such as are
encountered in recessed installations.
POWER SOURCE -Two types of power sources may be used to operate the receiver. The receiver may be operated
directly from an AC source or indirectly from a battery or DC source as follows:
AC operation -The SX-62A receiver operates from a 105 to 125 volt, 50/60 cycle AC outlet. Power consumption
is approximately 120 watts. If you are in doubt or unfamiliar with the voltage and frequency rating of your utility
service, consult your local power company representative. Attempting to operate the receiver from other sources
of power than specified may involve costly repairs.
The universal model, the SX-62AU, operates on 115 V'/130 V'/150 V./220 V./250 V. 25/100 cycle AC sources.
A selector switch on the power transformer permits operation on any of the line voltages shown.
VIBRAPACK BATTERIES
B-
SWITCH
8+
270 VOLTS
SWITCH
PL
1111
11111111
6 VOLTS + +
+
"A'
"B"
F i~.
2. Wirin~ dia~rams, DC power pZu~.
928520
CAUTION -When operating the universal model, it is necessary to check, and set if necessary, the selector switch on
the power
transformer before connecting the receiver to the source of power.
Note -The receiver will not operate from an AC source unless the jumper plug is located in its BATTERY POWER
receptacle. See Fig. 3.
DC Operation -The receiver may be operated from a 6-volt DC source (storage battery or equal) and a 270-volt
DC supply in the form of liB" batteries, vibrator power pack, or motor generator set. The DC source must be
capable of supplying the following voltages and currents for optimum results.
fiB II voltage ........... .
"B" current ........... .
Heater voltage ........ .
Heater current . . . . . . . . . .
270 Volts
150
Milliamperes
6.3 Volts
5 Amperes
Total current drain, when operating entirely from a storage battery, will run approximately 15 to 20 amperes.
DC power is connected to the receiver through the octal socket located on the rear apron of the chassis. The
jumper plug normally in this socket for AC operation is replaced with a standard octal plug for DC operation.
Wire the octal plug for DC operation as shown in Fig. 2.
SPEAKER CONNECTION - A four-terminal strip, marked "COM-3.2-8.0-500" is provided at the rear of the re-
ceiver for speaker connections. Any speaker having an impedance of 3.2 or 8 ohms can be used with the receiver by
connecting one lead from the speaker to the common ground terminal marked "COM" and the other lead to the terminal
which corresponds to the speaker impedance. When using a speaker with an impedance other than 3.2 or 8 ohms, a
matching transformer should be used to insure optimum performance. The matching transformer should have a 10-
watt power rating, a 500-ohm primary impedance, and a secondary impedance to match the impedance of the speaker
being used. The transformer should be mounted on or near the speaker. Connect the primary of transformer to the
terminals marked "500" and "COM" and the secondary to the speaker voice coil. The Hallicrafters R-46 and R-46A
speakers are both designed for use with your receiver. The R-46 speaker connects to the terminals marked "500"
and "COM"; the R-46A speaker connects to the terminals marked "3.2" and "G".
Page 4

COM 3.2 8.0 IlOO
PHONO
O©O
LICENSE PLATE
th.holllc:roften CII.
CHICAGO u.s.A.
o SE:;:'L IHA- I
JUMPER PLUG
(AC OPERATION)
OR RECEPTACLE FOR
EXTERNAL DC SUPPLY.
PHONO INPUT
CONNECTOR
Fi~. 3. Rear view.
o
o
AI A~ I GND
ANTENNA TERMINAL
STRIP
92D521-A
RECORD PLAYER CONNECTION - A phono jack is provided at the rear of your receiver for attaching a record player.
(See Fig. 3.) Any record player using a crystal pickup, or a magnetic pickup with a suitable pre-amplifier, will pro-
vide satisfactory results. For phono operation, insert the pin-plug from the record player or pre-amplifier into the
phono jack, set the RECEPTION control at "PHONO", set the RECEIVE-STANDBY switch at "RECEIVE", and adjust
the VOLUME and TONE controls as desired. The remaining controls are inoperative and will have no effect on phono
operation.
ANTENNAS - The r-f input of the receiver is designed to operate from either a single-wire antenna, or a half-wave
doublet or other tuned antenna employing a 50 to 600 ohm transmission line. Antenna connections are made to a three-
terminal strip at the rear of the receiver marked "A1", "A2", and "GND".
Single-Wire Antenna. The simplest antenna and one
which
will provide satisfactory performance throughout
the entire tuning range is a conventional Single-wire
antenna. In most localities, satisfactory results can be
obtained with just the 15-foot antenna wire included with
the receiver. Simply attach one end of this wire to ter-
minal "A1", connect the jumper wire between"A2" and
"GND", and run the wire about the room in any con-
venient manner. (See Fig. 4.)
H the receiver is operated in a steel constructed
building or where receiving conditions are exceptionally
poor, an outside antenna 50 to 100 feet long may be nec-
essary. In some locations, reception may be improved
by connecting a ground wire (ordinary copper wire) from
the terminal marked "G ND" to a cold water pipe or
outside ground rod.
Half-Wave Doublet Antenna. For top performance,
especially on the shortwave and amateur 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 Fig. 5.
The doublet antenna should be cut to the proper length
for the most used frequency or band of frequencies. The
overall length in feet of a doublet antenna is determined
by the following formula:
Length in feet = 468
Frequency in megacycles
For maximum signal pickup, the doublet antenna
should be erected with its length at right angles to the
desired station.
- over -
Fi~. 4. Sin~le lIire Antenna
1-1 ~. --- L (FEET)' ----;F""'REQ;;;i;~:~N8C;;-y "(M""'C)'---- ---~·-11
NOTE
SOLOERALL
JOINTS
Ft~. 5.
INSULATOR
Doublet Antenna usin~
Twin-Lead Transmission Line
92B2~03
o
92D2~O~
Page 5

The doublet antenna may be fed with either a balanced or unbalanced transmission line. When a balanced trans-
mission line such as "twin-lead" or a twisted pair is used, the transmission line connects to terminals "AI" and "A2",
and the jumper wire between terminals "A2" and "GND" is disconnected. (See Fig. 5.) When using an unbalanced
transmission line such as coaxial cable, the inner conductor connects to terminal "AI", the outer braid connects to
terminal "A2", and the jumper wire connects between terminals "A2" and "GND". A ground wire may improve recep-
tion when using an unbalanced transmission line. By feeding the doublet antenna with a transmission line having an
impedance of 300 ohms, a broader frequency response is obtained than that possible with a 50-75 ohm line.
The doublet antenna provides optimum performance only at the frequency for which it is cut. Therefore, it may
be desirable for reception on frequencies remote from the antenna frequency to utilize the antenna as a single wire
type. This is accomplished by connecting the two transmission line leads together and connecting them to terminal
"AI". The jumper wire 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 advantageous to use the
same antenna for receiving as for transmitting. This is especially true when a directive antenna is used since the
directive effects and power gain of the transmitting antenna are the same for receiving as for transmitting. Switching
of the antenna from the transmitter to the receiver may be accomplished with a double-pole, double-throw antenna
changeover relay or knife switch connected in the antenna leads.
For further information regarding antennas, refer to the "Radio Amateur's Handbook" or the "A.R.R.L. Antenna
Book", both published by the American Radio Relay League, West Hartford, Conn., U.S.A.
OPERATION
GENERAL BROADCAST RECEPTION - Certain front panel controls have been color coded to simplify the tuning
procedure for general entertainment purposes. High fidelity reception in the standard broadcast (AM) and frequency
modulation (FM) bands may be accomplished as follows: Turn the volume control clockwise beyond the tell tale click
of the switch. This turns the receiver on as indicated by the illumination of one of the dial scales. Similarly the
receiver is turned off by turning the control counter-clockwise beyond the click of the switch. At this point the three
"bat-handle" switches may be set at "RECEIVE" and "OFF" and forgotten. To receive standard broadcast (AM)
services; set the BAND SELECTOR for the position that illuminates the 550-1620 kiiocycle scale (bottom scale), set
the RECEPTION, SELECTIVITY, TONE and SENSITIVITY controls per the red dot, and adjust the TUNING and VOL-
UME
controls in the normal manner, tuning for clearest reception as usual.
CONTROL
VOL
UME control -
RECEIVE/STANDBY
SWitch -
RECEPTION
control -
BAND SELECTOR -
TUNIN:G control -
Page 6
RADIO-TELEPHONE
This control turns the receiver on and off in addition to controlling
the volume. Turn the control clockwise to turn on the receiver or
increase volume, and counter-clockwise to reduce volume or turn
off the receiver.
Normally set at "RECEIVE". May be set at "STANDBY" to disable
the receiver for short standby periods and yet keep the tube
heaters at operating temperature for instant use.
Set at "AM" for reception of amplitude modulated stations located
in the standard broadcast band or any of the shortwave bands, or
at "FM" for reception of FM stations located in the two highest
frequency ranges (two top dial scales).
Set for position that illuminates the dial scale covering the desired
band of frequencies. Extreme left hand position of this control
illuminates. the lowest dial scale.
The tuning control sets the frequency of reception, tuning the band
of
frequencies shown on the illuminated dial scale. The frequency
of reception is shown in kilocycles (KC) on the standard broadcast
range and in megacycles (MC) on the shortwave and FM ranges.
The frequencies of the local stations are generally listed in news-
papers, AM stations in kilocycles and FM stations in megacycles.
Information on short wave stations, not identified directly from the
dial, may be obtained from published log books available at most
book stores or radio supply houses. When tuning for the station,
tune carefully for the clearest reception and obtain top perform-
ance from your receiver.
CW
Same
Same
Set at "cw"
Same
The tuning control sets
the frequency of recep-
tion, tuning the band of
frequencies shown on the
illuminated dial scale.
The frequency of recep-
tion is shown in mega-
cycles (MC) on the short-
wave bands used by code
t ran S mitt e r s. When
tuning
for the station,
tune for the pitch of the
code Signal found eaSiest
to copy. The pitch of the
code signal will usually
rnn apprOXimately 1000
cycles.

CONTROL
SELECTIVITY
control -
SENSITIVITY
control -
TONE control -
FADIO-TELEPHONE
Normally set at "NORMAL/BROAD" for high fidelity
reception in the standard broadcast and FM bands. Use
the "NORMAL/MED." or ''NORMAL/SHARP'' for the
more crowded conditions existing in most of the short-
wave ranges. Note that as the receiver is made more
selective, the background noise and interference from
nearby stations is reduced. The setting of the selecti-
vity control is generally best determined by receiving
conditions, using just enough selectivity to isolate the
desired stations. The "CRYSTAL/BROAD" position
may be used when the frequency of reception is ex-
tremely congested.
Normally set maximum clockwise. Local high powered
stations may overload the receiver, shOwing up as dis-
tortion, hence conditions may require that this control
be turned counter-clockwise to reduce the sensitivity
of the receiver accordingly.
Normally set at "HI-FI" or "BASS" for AM or FM en-
tertainment purposes. The "LOW" and "MED." posi-
tions will be found desirable when listening on the
shortwave bands.
CW
This control may be set at "NOR-
MAl/MED." OR ''NORMAl/SHARP''
for the reception of code stations
not suffering local interference.
Congested receiving conditions may
be handled by increasing selecti-
vity, switching to one of the three
crystal positions for the degree of
selectivity required. Note that in
the
crystal poSition the tuning of
the receiver changes, i.e. the de-
sired station will be very loud on
one
size of zero beat and very weak
(crystal slot) on the other side.
The receiver sensitivity must be
controlled manually for code re-
ception, hence the SENSITIVITY
control must be advanced just
enough to keep the code stations
fnom blocking the receiver.
Normally set at "LOW" or ''MED.''
for code reception.
USE OF THE CALIBRATING CRYSTAL - A built-in secondary frequency standard and adjustable dial pOinter permits
accurate frequency calibration over any portion of the receiver dial. Three degrees of dial calibration accuracy may
be had as follows:
1. General Dial Indexing -Run the dial pOinter down to the left hand end of the dial scale, turning the TUNING
knob
until the left hand dial stop is reached. Line up the dial pointer with the index line using the small
POINTER RESET knob located to the left of the dial escutcheon.
2. Average Dial Calibration -Index the dial pointer as described above. Set the CALIB. XTAL switch at "CALIB.
XTAL", RECEPTION switch at CW, and tune the receiver to zero beat with the calibrating oscillator Signal,
i.e. the pitch of the whistle or beat note will pass through zero cycles at the exact center of the marker Signal.
The oscillator Signals will be found at multiples of 500 kilocycles on the lower 5 dial scales, i.e. 1000 kc and
1500 kc; 2 me, 2.5 mc, 3 mc etc.; 5 mc, 5.5 mc, 6 mc, etc.; 15 mc, 15.5 mc, 16 mc, etc.; or'27 mc, 27.5 mc,
28 mc, etc. After setting the TUNING control for zero beat, center the dial pointer exactly on the half-mega-
cycle dial division. For best results, the receiver sensitivity must be held to a minimum while making cali-
bration adjustments.
3. Precise Dial Calibration -To obtain a precise dial calibration the procedure outlined above should be repeated
for the particular section of the dial in use rather than merely checking calibration at either end of the dial
scale. Since the calibration signals appear every 500 kc along the dial, a calibration point may ea!:iily be ob-
tained on either side of the frequency of reception at any point along the dial.
After calibrating the receiver dial with the calibrating crystal, the oscillator is switched OFF and the RE-
CEPTION switch returned to the desired setting for normal reception.
RECORD PLAYER OPERATION -With a record player connected to the receiver it is merely necessary to set the
RECEPTION control at PHONO and operate the VOLUME and TONE controls as for normal radio reception.
NOTE: The receiver will not respond if the RECEIVE/STANDBY
switch is set at "STANDBY". The setting of the remaining controls,
except those mentioned above, is immaterial as they are not in use for
record player operation.
Page 7

HEADPHONE RECEPTION - A headset jack, located at the front panel, provides for headphone reception. Insertion of
the headset plug disables the speaker. Any high impedance headset, magnetic or crystal, will work with the receiver.
SERVICE
TUBE REPLACEMENT - The types of tubes required and their relative position in the receiver are shown in the
illustration, Fig. 6. When installing a replacement tube, insert the center guide pin into the center hole of the tube
socket; rotate the tube until the key on the guide pin drops into the notch in the socket hole; and push down until the
base of the tube rests firmly on the socket. A slightly different technique must be used on the miniature tubes. They
have seven small pins which have to be lined up with the socket holes before pushing into place. Handle with care as
all tubes are considered fragile and do not tolerate much mechanical abuse.
(!)
6C4
®
6AG5
@
6AG5
Be
Be
Be @
8e
8
FUSE
6SG7 6H6 5U4G 2A,2!5CN
~C?oo
e~ ®®
®O
OD3/VRl50
92D52~-l8
Ftg. 6. Top vtew showtng locatton of tubes and dtal lamps
DIAL LAMP REPLACEMENT - Refer to Fig. 6 for the location of the dial lamps used in the receiver. To gain access
to defective lamps, open the cabinet cover, remove the light shield (four screws) and unclip the dial lamp socket by
compressing the side springs. The socket may then be brought out into the open to change the defective lamps. Re-
place all lamps with 6-8 volt Mazda No. 44 (blue bead) or equivalent.
SERVICE OR OPERATING QUESTIONS - For further details regarding operation or servicing of the receiver, contact
your dealer. Make no service shipments directly to the factory before first writing for authorization and instructions.
~he factory cannot accept responstbtltty for unauthortzed shtpments.
The Hallicrafters Co. reserves the privilege of making revisions in current production of equipment and assumes no
obligation to incorporate these revisions in earlier models.
POSITIONING CONTROL KNOBS
BAND SELECTOR ... As required by flat on shaft
SELECTIVITY ... As required by markings
VOLUME. . . . Set at 10 for full clockwise rotation
TONE ......... As required by markings
RECEPTION ....... As required by markings
SENSITIVITY~ ... Set at 10 for full clockwise rotation
Page 8

DIAL CORD RESTRINGING
1. Remove POINTER RESET knob and then remove dial escutcheon by removing two screws at each side.
2. Remove chassis from cabinet by removing top and bottom screws at each side of front panel and three screws
at rear on underside of cabinet.
3. Remove front control knobs, and toggle switch and PHONES jack mounting nuts.
4. Remove front panel from chassis by removing two screws at each side of front panel.
5. Lift dial pointer off rail and out of way to prevent damage to pointer.
6. Remove two inner screws at each side of dial that secure dial assembly to side support brackets.
7. Loosen clamp which secures dial lamp cable to chassis and then position dial assembly forward to gain access
to front of drive pulley.
Restring the tuning capacitor drive with a 45 inch
length of 30 lb. test dial cord. Tie one end of the cord to
the tension spring at poSition A and follow the string-
ing sequence A through H as shown. At position H
stretch the tension spring and tie the cord securely to
the spring. Note that the dial cord is wrapped around the
tuning drive shaft two an<1 three-quarters times for
proper traction.
Restring the dial pointer drive with a 75 inch length
of 30 lb. test dial cord. Tie one end of the cord to the
tension spring at position 1 and follow the stringing
sequence 1 through 11 as illustrated. At pOSition 11
stretch the tension spring and tie the cord securely.
.am: RESTRING WITH TUNING
CAPACITOR FULLY MESHED.
92Cl~Bl-A
Index the dial pointer by setting the tuning gang at
maximum capacity, the RESET control in the middle of
its range, and aligning the pointer with the left hand dial
index marker.
Fi~. 7. Dial cable strin~tn~ procedure
ALIGNMENT PROCEDURE
IF ALiGNMENl'l455 KC)- Set the controls as follows:
BAND
SELECTOR .....•.. 550/1620 kc range
RECEIVE/STANDBY switch .. RECEIVE
CALIB. XTAL
switch ...... OFF
NOISE LIMITER switch. . . . . OFF
VOLUME control ......... Near Maximum
RECEPTION control. AM
SELECTIVITY control. . NORMAL/SHARP
SENSITIVITY control. . Near Maximum
Set tuning dial pointer at approximately 1,000.kc.
Connect high side of signal generator through an 0.1 mfd. capacitor to pin #1, of the 7F8 converter tube. With signal
generator set at approximately 455 kc align slugs S-1 3, 5, 10, 12 and 14 for maximum output.
Set RECEPTION control at CW and adjust slug S-8 for a 1,000 cycle note.
Set the SELECTIVITY control at CRYSTAL/BROAD. While slowly turning slug S-10 in one direction across the
resonant setting obtained above, "rock" the signal generator tuning and observe the dip in the output meter reading as
the adjustment passes through the response of the crystal filter. The correct setting of the slug S-10 is in the center
of the observed. dip. Set the signal generator at the weaker of the two responses obtained on either side of zero beat
and adjust the crystal phasing trimmer C -57 for the null.
Set the SELECTIVITY control at CRYSTAL/SHARP and with trimmer C-61 set near minimum capacity, slowly in-
crease its capacity while "rocking" the signal generator and adjust for maximum output. It may be necessary at this
point to reduce the signal generator input and the receiver sensitivity to prevent overloading. After peaking the adjust-
ment turn the trimmer in until a drop in output of about 2 db occurs. At this point the sharp crystal will have very
good selectivity without sacrifiCing too much gain.
Tune the signal generator to exact crystal frequency and note output meter reading. Set the SELECTIVITY control
at CRYSTAL/BROAD and note the drop in output, and output meter reading. Now switch to CRYSTAL/MEDIUM and
with trimmer C-60 near minimum capacity. slowly increase its capacity, while "rocking" the signal generator, until the
output meter indicates about midway between the output readings obtained in sharp crystal and broad crystal position.
Set the SELECTIVITY control at CRYSTAL/SHARP and reset signal generator for the exact crystal frequency.
Switch to NORMAL/SHARP and reset slugs 8-1,3,5 12,14 and trimmer C-58 for maximum output.
Set the RECEPTION controi at CW and adjust the BFO slug S-8 for zero beat.
IF ALIGNMENT (10.7 MC) - Set the controls as follows:
BAND SELECTOR. . . . . .. 27/56 mc range
RECEIVE/STANDBY switch .. RECEIVE
CALIB. XTAL switch ...... OFF
NOISE LIMITER switch ..... OFF
VOLUME .............. Near Maximum
RECEPTION control. . AM
SELECTIVITY control. NORMAL/SHARP
SENSITIVITY control . Near Maximum
Set tuning dial pointer at approx. midscale.
Connect the high side of the signal generator through an 0.1 mfd. capacitor to pin #1 of the 7F8 converter tube. Set
signal generator at 10.7 mc and adjust slugs S-4,6.9,13 and 15 for maximum output. Now set slugs S-2 and S-l1 for
maximum output but do not readjust slugs S-4 6.9, 13 and 15.
Set RECEPTION control at CW and adj3J.st slugs S-17 for zero beat.
Page 9

Set RECEPTION control at FM and adjust slug S-16 for maximum output. Now set Slug S-7 for the null or minimum
output as indicated on the output meter. Check the discriminator by slowly tuning the signal generator through 10.7 mc
and observe the two maximum audio level readings on the output meter. If the two peaks are equal the job is done; if
not
it may be necessary to reset Slug S-16 until a reasonable balance is obtained.
RF ALIGNMENT
After completing the alignment of the IF amplifier stages the RF amplifier stages may be aligned according to the
following chart. Connect the high side of the signal gen e rator to terminal A-I through th e dummy antenna specified
and connect a jumper between antenna terminal A -2 and GND. Use just enough signal generator output to obtain a 500
miUiwatt audio output level for best results.
ALIGNMENT CHART
Dummy
Antenna
RMA
RMA
RMA
RMA
300-ohm non-
inductive
resistor
300-ohm non-
inductive
resistor
Signal
Generator
Frequency
1500 ke
600 kc
4.0 me
1.8 me
14.0 me
7.0 mc
28 me
18 me
50 me
30 me
105 me
60 me
Band
Selector
Range
550-1600 kc
1.62-4.9 me
4.9-15 mc
15-32 me
27-56 mc
54-109 me
* Note - Calibration adjustment.
Radio
Dial
Setting
Adjust
Remarks
1500 kc C-47*, 6, 21 , 35
Adjust for max. output
600 ke S-36*
4.0 me C -45*, 20,34
Adjust for max. output
1.8 me
S-35*
14.0 me
C-43* , 4, 19, 33
Adjust for max. output
7.0 mc
S-34* , 22, 26, 30
28 me C-42*, 3, 18, 32
Adjust for max. output
18 me
S-33* , 21, 25,29
50 me
C-41* , 2, 17, 31
Adjust for max. output
30 me
S-32* , 20, 24 , 28
105 me
C-40* , 1, 16, 30
Adjust for max. output
60 mc
S-31* , 19, 23 , 27
Note -
The standard RMA dummy antenna mention in the alignment chart consists of a 200 mmf condenser in
series with a 20 uh r-f choke which is shunted by a 400 mmf condenser in series with a 400 ohm carbon
resistor.
Page 10
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e
e
(0
(0
(0
o
G
G
Fig. 8. Alignment adjustments. bottom view
Fig. 9. Alignment adjustments. top view