SR-160 Transceiver

hallicraliers
OPERATING AND SERVICE INSTRUCTIONS COMMUNICATIONS TRANSCEIVER MODEL SR-160

IMPORTANT
BEFORE OPERATING THE SR-160 REFER TO PAGE 16 OF THIS MANUAL, PARAGRAPH 8-3 (BIAS ADJUSTMENT). THE BIAS ADJUSTMENT ON THE POWER SUPPLY MUST BE SET PROPERLY TO PREVENT PERMANENT DAMAGE TO THE FINAL AMPLIFIER TUBES AND FOR OPTIMUM PERFORMANCE OF THIS EQUIPMENT.
“The Hallicrafter’s Company warrants each new radio product manufactured by it to be free. from defective material and workmanship and agrees to remedy any such de fect or to furnish a new part in exchange for any part of any uriit of its manufacture which u·nder normal installation , use and service discloses such defect , provided the unit is delive red by the owner to our autllOri=ed radio dealer, wholesaler, from whom purchased, or, authorized service center, intact, for examination , with all transportation charges prepaid within ninety diJys from the diJte of sale to original purchaser and provided that such examinat ion discloses in our ;udgment that it is thus defective . This warranty does not extend to any of our radio products which have been sub;ected to misuse, neglect, accident, incorrect wiring not our own, improper instal/ation, or to use in viol9tion of instructions fumis/l ed by us, nor extended to units which /lOve been repaired or altered outside of our fa ctory or autllOri=ed service center, nor to cases where the serial number thereof has been removed, defa ced or changed, nor to accessories used therewith not of our own manufacture. Any part of a unit approved for remedy or exchange hereunder will be remed ied or exchanged by the authorized radio dealer or wholesaler without charge to the owner. This warranty is in lieu of all other warranties expressed or implied and no representative or person is authorized to assum e for liS allY other liability in connection with the sale of our radio prodllcts:’
pA;@ hallicraliers ~@o

Figure 1. Hal/icrafters Model SR·160 Transceiver .

156·002823

SECTION I

GENERAL DESCRIPTION

The Hallicrafters Model SR-160 Transceiver is a precision-built, compact, high-performance radio equipment of advanced design. This transceiver utilizes 17 tubes and a single conversion heterodyning system to provide for the transmission and reception of single-sideband (SSB) and continuous wave (CW) signals on the 80 , 40 , and 20 meter bands.
The versatility of SR-160 equipment permits it to be operated as a fixed station or as a mobile equipment. A 117-volt, 50/ 60-cycle AC power supply complete with speaker (Model PS-150-120) is available for fixed-station use; a12-voltDCpower supply (M ode l PS-150-12), and a m obile installation kit (Model MR-160) are available when the transceiver is to be used in a mobile application.
An advanced feature of the SR-160 equipment is the Receiver Incremental Tuning (RIT) control. This control enables the operator to unlock the receiver frequency without disturbing the transmitter frequency, and tune the receive r approximately three KC either side of the transmitter frequency. Rotating the RIT switch to OFF automatically returns the equipment to the transceiver condition.
Another special feature is the amplified Automatic Audio Level Control (AALC) which functions in the transmit mode. The AALC circuitry prevents

“splatter” due to severe “flat-topping” of the final amplifier by providing approximately 15 DB of compression after a small amount of “flat-topping” occur s.
Other features of the Model SR-1 60 Transceiver include:
· A stable, accurately-calibrated VFO.
.A built-in, 100-KC crystal calibrator circuit, (Model SR-160 is supplied less crystal and tube).
.Lower sideband operation, 80-meter and 40-meter bands ; upper side band on 20-meter band: Manual SSB operation (push-to-talk) and manual CW operation. Provision for voice controlled SSB ope ration (VOX) with accessory unit.
. A crystal-lattice filter.
· A product detector.
· An S-meter/ RF output level indicato r.
IMPORTANT
Do not, under any circumstance, attempt to operate the SR-160 equipment before becoming completely familiar with the instructions contained wi thin this manual.

·1

SECTION II TECHNICAL DATA

VI 12AW6 V2 12BE6 V3 12BZ6 V4 6EA8
VS 12AX7A/ ECC83
V6 6AQSA V7 12AU6
V8 12AT7

TUBES AND FUNCTIONS

Receiver RF Amplifier

V9 12AT7

Receiver Mixer First IF Amplifier

VIO 6AM8A VII 12BE6

Receiver SeconJ IF Amplifier anJ Meter Amplifier

VI2 OA2

ProJuct Detector anJ First AuJio Amplifier
Receiver AuJio Output
IOO·KC Calibrotor Oscillator (Not supplieJ with unit.)

VI3 12BE6 VI4 12BY7A VIS 12DQ6B VI6 12DQ6B

Carrier Oscillator/BFO anJ ThirJ Microphone Amplifier

VI7 6EA8

First anJ SeconJ Microphone Amplifier AVC/AALC Amplifier.Detector HeteroJyne Oscillator anJ Mixer (40M) Voltage Reguldtor Transmitter Mixer Transmitter Driver Transmitter Power Amplifier Transmitter Power Amplifier VFO anJ CathoJe Follower

FREQUENCY COVERAGE:

Three-band Capability – Full frequency coverage provided for 80, 40, and 20 meter amateur bands. The frequency range of each band is as follows:

80M Band: 3500 KC – 4000 KC 40M Band: 6900 KC – 7400 KC 20M Band: 13900 KC – 14400 KC

OPERATION:

Single Sideband

LSB 80M and 40M bands USB 20M band Push-to-talk control (VOX-
optional accessory)

CW- Manual

FRONT PANEL CONTROLS:

RIT CONTROL (OFF/ON); RF – AF GAIN; OPERATION (OFF/RECONLY/CW TUNE/SSB/ CAL); DIAL CAL; FREQUENCY; BAND SE-
LECTOR (80M/40M/20M); DRIVER TUNE; CARRIER-MIC GAIN; FINAL TUNE.

GENERAL:

Dial Calibration – 5-KC increments.

Calibration Accuracy – Less than 2 KC between 100-KC points after indexing. (Built-in 100-KC crystal calibrator circuit requires 100-KC crystal and 12AU6 tube to operate.)

VFO – 500-KC tunable range.

2·

Stability – Within 300 CPS after warmup. Tubes – 16 plus one voltage regulator, six diodes, and one varicap. Ambient Temperature Range – Minus 20° to plus 50°C. Construction – Rugged, lightweight aluminum. Dimensions (HWD) – 6-3/8 by 13 by 11 inches. Net Weight – 13-1/4 pounds. Shipping Weight – 18 pounds (nominal).
TRANSMITTER:
Output Tubes – Two 12DQ6B tubes in parallel.
Output Impedance – Fixed, 50-ohm pi-network.
Power Input – SSB .·.·· 150 watts PEP MAX. CW ··.· , 125 watts MAX.
Carrier and Unwanted Sideband Suppression – 50 DB.
Distortion Products – 30 DB.
Audio Response – 600 CPS to 2800 CPS (3 DB).
Microphone Input – High impedance.

RECEIVER:

Net Weight – 5-1/2 pounds.

Sensitivity – 1 microvolt for a 20-DB signalto-noise ratio.
Audio Output – 2 watts.
Output Impedance – 3.2 ohms.
Overall Gain – 1 microvolt for 1/2-watt output.
Antenna Input – 50 ohms.
Single Conversion – IF is 5200 KC.
Crystal-lattice filter – 5200 KC.
ACCESSORIES:
Mobile Installation Kit Model MR-160 – Contains mounting brackets and interconnecting cable to power the Model SR-160 Transceiver from the Model PS-150-12 Power Supply. The cable length is 16 feet and may be cut to the length required for the installation.
Net Weight – 3-1/2 pounds.
Shipping Weight – 4-1/2 pounds (nominal).
12-volt DC Power Supply PS-150-12 – DeSigned for out-of-the- way trunk installation. . . te rminal strip provides for quick and easy connection to the interconnecting cable. Contains five silicon diode rectifiers and four transistors. The battery supply leads supplied are twenty feet long and may be cut to the length required for the installation.
Input Power Requirements:
Transmit (CW) . . . . . 20 amperes.
Receive .. ” …… 10 amperes.
Dimensions (HWD) – 3-3/4 by 10 by 6-3/4 inches.

Shipping Weight – 9 pounds (nominal).
117-volt AC Power Supply Model PS-150-120 Styled as a companion unit to the Model SR-160 Transceiver, this supply also contains a 4-inch by 6-inch speaker … one-cable connection carries power to, and audio from, the transceiver . .. maybe plugged into any 117-volt wall outlet … contains five silicon diode rectifiers.
Input Power Requirements:
Transmit (CW) . . . . . 300 watts.
Receiver ……… 140 watts.
Dimensions (HWD) – 6-1/4 by 7-1/2 by 10 inches.
Net Weight – 22 pounds.
Shipping Weight – 28-1/2 pounds (nominal).
VOX Control Unit Model HA-16 – DeSigned for quick attachment to rear of Model SR-160 cabinet to provide voice controlled operation. Power is derived from Model SR-160 through a single plug-in connector. Contains three tubes and sensitive VOX relay.
Net Weight – 3/4 pound.
Shipping Weight – 1-1/2 pounds (nominal).
lOO-KC Calibrator Crystal – The correct type calibrator crystal unit may be obtained under Hallicrafters part number 019-002712 or maybe obtained from a crystal supplier to the following specifications:
Frequency – 100.000 KC ±.005%. Resonance – parallel. Load Capacity – 20 J1.J1. F. Holder Type – HC-13/U.

SECTION III

INSTALLATION

WARNING

3-1. UNPACKING.

LE T HAL HIGH VOLT AGE IS PRESENT WITHIN THIS EQUIPMENT. BE CAREFUL WHEN INST ALLING THE UNIT, WHEN MAKING BIAS ADJUSTMENTS, AND· WHEN PERFORMING CHECKS UNDER THE CHASSIS.

Carefully remove this equipment from its carton and packing material and examine it for any possible damage which may have occurred during transit. Should any sign of damage be apparent, immediately file a claim with the carrier stating the extent of the damage. Check all shipping labels and tags for special instructions before removing or destroying them.

-3

3-2. LOCATION.
The Model SR-160 Transceiver may be placed in any location permitting free air circulation through the ventilation openings in the cabinet. However, excessively warm locations such as those adjacent to radiators and heating units should be avoided.
3-3. ANTENNAS.
Antenna connections are provided on the rear of the transceiver, as shown in figure 2. If a common antenna is used, the antenna switch (S4) must be in the COMMON (down) position and the antenna connected to the COMMON connector. If separate antennas are used, the switch must be in the SEPARATE (up) position, and the receiver antenna connected to the top RE C. ONLY connector (J6), and the transmitter antenna connected to the COMMON connector (J5).

Refer to the ARRL handbook or similar publications for the selection and installation of antennas.. An antenna system which terminates properly into a 50-ohm transmission line will satisfy the load requirements ofthe Model SR-160 Transceiver.
NOTE
Never operate the transceiver without connecting to an antenna load or to a resistive dummy load.
3-4. BASE INSTALLATION.
The Model SR-160 Transceiver as a base station may be operated with or without a linear power amplifier.
To operate the Model SR-160 from I17-volts AC, the Model PS-150-I20 Power Supply, or an equivalent supply, is required. Merely connect

S4

J6

J5

J7

J3

J2

R76

Figure 2. Rear Panel View 01 Transceiver.

156-002824

the multiconductor plug, attached to the power supply, to the POWER receptacle on the rear of the transceiver; connect the line cord to the wall outlet; and connect the antenna system to the transceiver ANTENNA receptacles as outlined in paragraph 3-3. A four- by six-inch speaker is contained within the power supply and is interconnected to the transceiver through the cable. The microphone receptacle is located on the front panel, and a push-to-talk style microphone wired as shown in figure 8 is required. The microphone cable connector is an Amphenol 80-MC2M.

Figure 3 shows a typical base installation, in block diagram form, making use of alinear power amplifier and an external antenna change-over relay. In the installation shown, the receiver input is connected directly to the antenna relay through the top ANTENNA connector (J6); the transmitter output of the transceiver is obtained through the bottom ANTENNA connector (J5) and fed to the linear amplifier input. If desired, two separate antennas may be used in the installation shown, eliminating the use of the antenna changeover relay.

LINEAR AMPLIFIER

POWER SUPPLY PS-150-120
A l’

ANTENNA ~ SWITCH <UP)

TO EXTERNAL

117V-60 CPS

I

-I.N…..

O,.U….,T TRANSMIT

SR-160 TRANSCEIVER

b D

POWER SOCKET (MALE)

RECEIVE

I
16 PIN II
IQ PIN 10

POWER PLUG
( FEMALE)

V
EXTERNAL ANTENNA RELAY
(117 VAC) COIL
· iI

Figure 3. Base Installation, Using a Linear Amplifier

156·002825

Pins 10 and 11 of the POWER plug connect to internal relay contacts on the antenna relay (K2) of the transceiver and may be connected into the circuit to control the external antenna relay as shown. Push out the retaining pin in the cable connector and loosen the cable clamp to gain access to the plug wiring.
IMPORTANT
Before operating the Model SR-160 as a transmitter, the bias adjustment control located on the power supply must be set. Refer to paragraphs 8-3 and 9-2 for details.
3-5. MOBILE INSTALLATIONo
The Model SR-160 Transceiver may be installed in any vehicle having a 12-volt DC power source. To complete the mobile installation, a Model PS-150-12 Power Supply, a Model MR-160 Mobile Installation Kit (figures 4 and 5) and a mobile antenna system will be required.
The PS-150-12 Power Supply, as shipped, is wired for vehicles having the negative side of the battery grounded. The Model SR-160 Transceiver and VOX accessory unit will operate without modifications in mobile installations of this type.
If the equipment is to be installed in vehicles having the positive battery terminal grounded, make the wiring change noted in figure 19 (Model PS-150-12 Power Supply) and also make one ofthe two following suggested wiring changes in the Model SR-160 Transceiver.

1. If the transceiver unit is used exclusively as a mobile unit:
a. Connect a NO. 22 AWG wire jumper across the relay supply rectifier (CR7).
b. Disconnect the relay supply filter capacitor section (C41C).
c. Rewire the surge diode (CR6) located at the antenna relay coil so that the cathode end is connected to the black/white wire.
CAUTION
WITH TillS MODIF1CATION DO NOT USE THE MODEL SR-160 TRANSCEIVER WITH THE PS-150-120 POWER SUPPLY.
2. If the transceiver unitis to be used interchangeably with the PS-150-120 Power Supply (AC mains) and the PS-150-12 Power Supply (mobile with positive supply terminal grounded) then modify the SR160 as follows:
a. Reverse the polarity of the relay supply rectifier (CR7), that is, connect the cathode to the heater terminal at the tube socket.
·5

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ITEM NO.

DESCRIPTION

QUAN .

HLC NO.

CABLE ASSY

087· 007933

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TERMINAL RING

7

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SCREW, THREAD

12

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FORMING

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FLAT WASHER

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426· 003943

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INTERNAL T OOTH

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426· 001943

L OCKWASHER

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HEX NUT

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401 · 078662 ·

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CABINET PLATE

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MOUNTING PLATE

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PLATE LOCATION OPTIONAL. (MOUNTING HOLES IN PLATE DESIGNED TO FIT CABINET PERFORATIONSl. NO.8 THREAD FORMING SCREWS FIT CABINET PERFORATIONS.
FORM THIS PLATE AS REQUIRED.

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Figure 5. Typical Mobile Installations of Transceiver, Using MR-160 Installation Kit.

156-002826
-7

b. Disconnect the relay supply filter capacitor section (C41C) and substitute a 300 fJ. F 25V electrolytic capacitor unit, connecting the positive terminal to the chassis and the negative terminal to the relay supply.
c. Rewire the surge diode (CR6) located at the antenna relay coil so that the cathode end is connected to the black/white wire.
The Model PS-150-12 Power Supply may be installed in any convenient location. In the installation discussed in this book, the power supply will be installed in the trunk. (See figure 6.) Mount the power supply securely, using self- tapping screws. Position the power supply in such a manner that the side with the terminal strips is accessible.
1 RED/WHITE #18; 575V @200MA
2 RED #18; 250V @1’15MA
3 WHITE #18; NEGATIVE BIAS
4 BLACK/WHITE #18; SWITCHING
BROWN #12; HEATERS

Run the multiconductor power cable supplied in the installation kit MR-160 from the Model SR-160 Transceiver under the floor mat and rear seat and into the trunk.. Since this cable is weatherproof, it may be threaded underneath the vehicle if desired. Cut the cable to the desired length, strip the wires, and connect these wires to the terminal strip on the power supply. (See figures 7 and 18 for color coding and terminal numbering.)
IMPORTANT
Before connecting to the vehi.cle’s battery, check the transceiver, if already installed, to ascertain that the OPERATION switch is in the OFF position.

PS-150-12 POWER SUPPLY

Figure 6. Wiring Diagram 01 Mobile Installation.

mI TO POSITIVE POST ~ OF BATTERY
30 .MP FUSE
TO TOP I+J TERMINAL ON POWER SUPPLY FUSE BLOCK DETAIL

156.002827

Connect the two NO.8 AWG wires supplied between the two-connector terminal strip on the power supply and the battery. The red/White wire should be connected from the top terminal on the power supply to the positive (+) side of the battery and the red/black wire from the bottom terminal to the negative (-) side of the battery. These wires should be cut to a suitable length before being connected to the battery. The positive lead should be connected to the battery through a 30-ampere fuse block (not supplied, see figure 6). If the vehicle has a positive ground electrical system, fuse the negative lead.
8·

CAUTION
USE CARE WHEN MAKING CONNECTIONS TO THE BATTERY IN THE VEInCLE. THE POWER IN A BATTERY CAN CAUSE DANGEROUS BURNS AND EVEN EXPLOSION IF SHORT CIRCUITED.
Connect the speaker to the jack provided on the front panel of the Model SR-160. This jack accepts a standard PL55 type plug. The speaker can also be connected to the rear of the Model

SR-160 through the POWER receptacle (J7) , terminals 8 and 9 (see figure 7). Use of the auto radio loud speaker is not recommended unless a switch is installed to remove the speaker from the auto radio when operating the Model SR-160.
Install the antenna system in the manner recommended by the antenna manufacturer. Connect the coaxial cable from the antenna to the

COMMON ANTENNA receptacle at the rear apron of the Model SR-160. (Check the selector switch; it should be in the COMMON position-down.) The antenna receptacle on the Model SR-160 mates with a phono-pin-plug type of connector. Use care when soldering the center conductor of the coaxial cable to the plug pin. Solder on the outside surface of the pin can damage the receptacle on the transceiver.

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REO/ WHITE 6’8 REO#’8

TO T5502 ON

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PS-150-12.PINS

575v

AS MARKED.

(SEE FIGURES 18 ANO 191

2 27SV

WHITE -#’8 BLACK / WHITE #18 BROWN ‘#’2 BLACK#’2 ORANGE#”B

3 -IOOV 91A5
4 SWITCH
5 FILAMENTS
6 GROUND
7 SPARE
‘-‘

Figure 7. Schematic Diagram of Model MR-160 Interconnecting Cable.

156·002907

Connect a suitable microphone to the receptacle provided on the front panel. The microphone receptacle mates with an Amphenol 80MC2M cable connector. It is important that the internal wiring of the microphone be as shown in figure 8.

PLUG (AMPHENOL 80-MC2MI

Figure 8. Required Microphone Wiring.

156·002828

3-6. MOBILE NOISE SUPPRESSION.
The following suggestions may be helpful in the suppression of noise encountered in mobile operation. Install resistor-type spark plugs and coaxial bypass capacitors in the ignition coil, generator and voltage regulator leads. Install bracket-mounted coaxial capacitors in the generator and battery leads to the voltage regulator and connect a 0.005 jJ. F mica or disc capacitor from the generator lead to ground. Chokes maybe used in the generator fields and armature leads instead of the bypass capacitors – approximately 12 turns of NO. 18 wire on a 1/4-inch powdered iron core for the field lead choke and apprOximately 12 turns of NO. 12 or NO. 14 wire on a 1/4-inch powdered iron core for the armature lead choke.

IMPORTANT
Before operating the Model SR-160 as a transmitter, set the bias adjustment control on the PS-150-12 Power Supply as outlined in paragraph 10-2.

Hallicrafters has available a Mobile NoiseSuppreSSion Kit, Model HA-3, which will fulfill any suppression requirements ofthis installation.

Only after familiarizing yourself with the controls and their functions, as outlined in Sections IV and V, should you perform an operational check. It is recommended that the engine be running while operating the Model SR-160 Transceiver to prevent draining power from the battery.

Additional information, concerning the proper suppression of mobile noise, is available in the Handbook of Instructions for Hallic rafters , Model HA-3 Mobile Noise Suppression Kit and in other current handbooks on the same subject.

-9

SECTION IV

FUNCTION OF OPERATING CONTROLS

All controls utilized during normal operation of Hallicrafters Model SR-160 Transceiver are located on the front panel (see figure I).
4-1. RIT CONTROL. ON/OFF.
The Receiver Incremental Tuning (RIT) control consists of two controls with concentric shafts. The ON/OFF function of the lever control either puts the variable-element RIT control in or out of operation. This control, in the ONposition, enables the operator to fine-tune the receiver plus or minus three KC by means of the RIT potentiometer (round knob) without disturbing the initial calibration or transmitting frequency. Returning the control to the OFF position again locks the receiver frequency to the transmitter frequency. RIT must be turned OFF to calibrate the dial or to operate the transmitter and receiver on a common frequency.
4-2. RF GAIN – AF GAIN.
The RF GAIN and AF GAIN controls are two controls mounted on concentric shafts. The RF GAIN control (lever control) varies the gain ofthe receiver RF amplifier stage. Maximum sensitivity is obtained with the control set fully clockwise.
The AF GAIN control (round knob) adjusts the audio output level at the speaker terminals and PHONES jack. Clockwise rotation increases the signal applied to the grid of the audio amplifier, thus increasing the audio level.
4-3. OPERATION.

balanced out for SSB operation. In the CAL position, the unit operates in the receive mode, but with the lOO-KC marker crystal oscillator running to supply calibration signals at the lOO-KC points on the dial.
4-4. MIC CONNECTOR.
The MIC connector provides for the connection of a push-to-talk microphone for use in SSB transmission.
4-5. DIAL CALIBRATION ADJUSTMENT (DIAL CAL).
The DIAL CAL control varies the frequency of the variable frequency oscillator (VFO) over a small range so that the dial calibration may be set precisely when compared to a standard.
4-6. FREQUENCY.
The FREQUENCY (tuning) control determines the frequency to which you are listening or transmitting. (Refer to RIT control effect paragraph 4-1.) This control is connected to the tuning dial which presents a visual indication of the frequency in the left-hand window on the panel.
4-7. BAND SELECTOR.
The BAND SELECTOR control is a threepOSition switch used to select the desired band of operation. The bands of operation are referenced to the wavelength in meters, that is, 80M, 40M and 20M.

The OPERATION control is a five position switch. In the OFF position, all power is disconnected from the circuitry. In the REC ONLY position, the receiver portion of the transceiver is placed in operation and all circuits common to both receiver and transmitter are in the receive condition, while circuits used only in the transmit mode are either biased off or switched off by the control relay. In the CW-TUNE position, the control relay switches the circuitry to transmit condition, and if the unit is properly tuned it will deliver a CW signal, the level of which is controlled by the CARRIE R control. Inse rting an open circuit key into the KEY jack will interrupt the signal and the unit may then be keyed (CW operation). In the SSB operation, the circuitry is switched to receive conditions until the microphone PTT switch is closed. The control relay then switches the circuits tothe transmit mode with the carrier

4-8. PHONES JACK.
This receptacle provides for the use of headphones. When the headphone plug is inserted, the speaker is disabled. High or low impedance headphones may be used.
4-9. DRIVER TUNE.
The DRIVER TUNE control resonates the associated RF amplifier and mixer stages in both the transmit and receive modes of operation. When operating in the receive mode, the control requires occasional “touch-up” to obtain maximum receiver sensitivity as the unit is tuned across the band. For transceiver operation, the control is always tuned for maximum transmitter output and left at this setting during the receive portion of the contact.

4-10. CARRIER-MIC GAIN”
The CARRIER and MIC GAIN controls are separate potentiometers operating through concentric shafts.
The CARRIER control (lever control) sets the RF output level for CW operation and during the transmitter tuning process for CW or SSB operation. The control is functional only in the CWTUNE position ofthe OPERATION switch. Turning the control clockwise increases the RF output level.
The MIC GAIN control (round knob) sets the audio level to the balanced modulator stage from the microphone amplifier stages. The control has sufficient range to handle any high impedance, high or low level microphone designed for voice communications.

4-11. FINAL TUNE.
The FINAL TUNE control drives a variable capacitor that tunes the pi-network used to couple the PA stage to the antenna load. The control is calibrated in band segments to permit presetting the capacitor near resonance during the tuning procedure.
4-12. S-METER.
This meter functions as an indicator of relative signal strength in the receive mode and as a relative power output indicator in the transmit mode. It is switched automatically when the mode of operation is changed.

SECTION V TUNING PROCEDURE

5-1. GENERAL.
The tuning procedure of the Model SR-160 Transceiver is not complicated; however, care should be exercised when tuning to insure peak performance of the equipment. The following paragraphs describe the procedures for receiver and transmitter tuning.
IMPORTANT
Before operating the SR-160, the bias adjustment control on the power supply must be set. See paragraph 8-3 of alignment procedure.
5-2. RECEIVER OPERATION.
Preset the controls as indicated:
RIT ………… OFF.
RF GAIN . . . . . . . Maximum (clockwise).
AF GAIN . . . . . . . As required.
DIAL CAL . . . . . . . Center or leave in calibrated pOSition.
BAND SELECTOR .. Desired band.
FINAL TUNE…… Nonoperating.
CARRIER …….. Nonoperating (Full CCW).
MIC GAIN . . . . . . . Nonoperating (Full CCW).

OPERATION . . . . . ” REC ONLY position.
FREQUENCY. . . . . . Desired frequency.
DRIVER TUNE …. Adjust for maximum S-meter reading on Signal or maximum background noise.
As the receiver is tuned across the band an occasional readjustment of the DRIVER TUNE control will be found necessary. Maximum AVC effect will be obtained with the RF GAIN control set at maximum sensitivity. The use of the RF GAIN control unde r special ope rating conditions is left to the discretion of the operator.
5-3. DIAL CALIBRATION.
The follOwing procedure is applicable if the crystal calibrator has been made operational and calibrated per paragraph 8-6.
Preset the controls as outlined in paragraph 5-2, except set the OPERATION control at CAL.
To calibrate the dial, set the dial to the lOO-KC point nearest to the desired frequency. Rotate the DIAL CAL control for zero beat.
It may be necessary to increase the AF GAIN control setting to recover sufficient audio near zero beat. The RIT control must be in the OFF pOSition when calibrating the dial.
After calibrating the dial, return the OPERATION control to either REC ONLY or SSB to receive on the desired frequency. Repeak the DRIVER TUNE control as required.

·11

5-4. BASIC TRANSMITTER TUNE-UP.
Preset the following controls as indicated:
CARRIER …….. Initial setting at minimum (Full CCW).
MIC GAIN . . . . . . . Initial setting at minimum (Full CCW).
BAND SELECTOR .. Desired band.
FINAL TUNE…… Desired band segment.
RIT CONTROL …. OFF
FREQUENCY. . . . . . Desired frequency.
DRIVER TUNE …. Use initial setting obtained for receive mode
OPERATION …… REC ONLY.
Set the OPERATION control at CW-TUNE and close the key circuit ifakeyeris plugged into the key jack. Rotate CARRIER control (lever control) clockwise until a small indication is observed on the S-meter. In the transmit mode, the S-meter indicates relative RF output voltage. Adjust the FINAL TUNE control for maximum output, and then adjust the DRIVER TUNE control for maximum output voltage. Adjustthe CARRIER control as required to keep the S-meter reading near S-9 while tuning.
Always use the DRIVER TUNE setting obtained during transmitter tuning when receiving on the frequency. The setting obtained while tuning the receiver is generally two broad to satisfy the transmitter requirement.
5-5. CW OPERATION.
Tune the transmitter as outlined in paragraph 5-4. When akeyer is plugged into the key jack, its key circuit must be closed to permit tuning for either CW operation or SSB operation. If the SR-160 is used to drive a linear amplifier, adjust the CARRIER control (lever control) for the drive level required by the linear amplifier. When operating into an antenna load, advance the CARRIER control to just below saturated drive level.
Saturated drive level is determined in the following manner. Start from the full counterclockwise CARRIER control setting and slowly increase the output (clockwise) while observing the S-meter. Set the control at a point where further rotation does not cause an appreciable increase in the S-meter reading. This is saturated output (operate slightly below this level).
12-

The transmitter is now ready to key. To receive, return the OPERATION control to the REC ONLY position.
5-6. PUSH-TO.TALK OPERATION.
Tune the transmitter as outlined in paragraphs 5-4 and 5-5. Note the S-meter reading obtained for maximum drive level to the linear amplifier or the maximum saturated output when operating into an antenna load.
Return the CARRIER control to mlmmum output and set the OPERATION control at SSR
Depress the microphone push-to-talk switch, speak into the mic rophone in a normal voice level, and advance the MIC GAIN control (round knob) until the S-meter swings upward to approximately one-half the reading noted at maximum output during tuning with carrier_
The MIC GAIN control setting will be found to be less critical because ofthe compression action of the AALC circuitry; however, the knob setting still depends upon the type of mic rophone, the operator’s voice characteristics, and his operating habits.
Sufficient microphone gain has beenbuiltinto the SR-160 to handle the usual range of levels associated with communication type microphones.
ReleaSing the microphone switch button will return the transceiver to the receive condition.
NOTE
If a keyer circuit is left plugged into the key jack, it must be closed to permit SSB operation.
5-7. VOICE CONTROLLED SSB OPERATION.
The Model SR-160 Transceiver operates SSB with push-to-talk control; however, the VOX Control Unit Model HA-16 is available for voice controlled single side band operation. When this accessory unit is installed, the following operating procedure will apply.
Initially set the PTT- VOX selector switch of the VOX control unit at PTT, and set the three controls (SENS, DELAY and ANTI-TRIP) at their full counterclockwise pOSitions. Reduce the AF GAIN on the transceiver to a relatively low level.
Use the tuning procedure outlined in paragraphs 5-4,5-5, and 5-6 to ready the transceiver for SSB operation.

With the OPERATION control on the transceiver set at SSB set the selector switch on the VOX control unit at VOX and set the VOX accessory unit controls as follows:
1. Advance the SENS control (clockwise), while talking into the microphone, until the VOX relay closes on the first syllable of speech. (Use no more VOX gain than necessary for best results.)
2. Adjust the DELAY control for the desired drop-out delay. The delay period increases as the DELAY control is turned clockwise. The delay period should be long enough to prevent change-over between words but not long enough to miss the other operator’s quick reply.
3. Set the receiver AF GAIN control for the desired listening level and advance

the ANTI-TRIP sensitivity control (clockwise) until the recei1t”‘ed signals do not actuate the VOX relay. Excessive anti-trip gain or a major increase in the established listening level may lock out the voice control system.
With the VOX accessory unit adjusted, either method of control may be selected by simply setting the selector switch for either PTT or VOX.
NOTE
Some microphones equipped for push-totalk control have shorting contacts in the switch to disable the microphone element when the pushbutton is released. VOX operation will not be feasible unless this circuitry is disconnected within the microphone.

SECTION VI THEORY OF OPERATION

6·1. GENERAL.
The Model SR-160 Transceiver consists of a single conversion receiver and single conversion transmitter. The VFO circuitry, the heterodyne crystal oscillator (40M band) circuitry, the carrier/BFa crystal oscillator circuitry, the AVC/ AALC amplifier-detector circuitry, the meter circuitry and the crystal filter/IF amplifier circuitry all are common to both the transmitter and receiver systems. Refer to figure 9 for the block diagram of the equipment and to figure 20 for the schematic diagram.
6·2. RECEIVER SECTION.
The signal at the antenna is fed to the receiver’s RF amplifier stage (VI) through the antenna relay (K2) located in the transmitter final amplifier section. The signal is amplified and fed to the receiver mixer (V2) where it is heterodyned with the VFO (variable frequency oscillator) on the 80M and 20M bands, or with the product of the VFO and the heterodyne crystal oscillator on the 40M band to produce the 5200 KC intermediate frequency.
The RF amplifier and mixer tuned circuits are selected by the BAND SELECTOR switch and tuned by the DRIVER TUNE control.
The signal, now at intermediate frequency, is fed through the crystal filter and further amplified by two stages of IF amplification (V3 and V4). The output of V4 is fed to the product detector (V5) and to the AVC amplifier/detector (VIO). At the product

detector the signal is mixed with the 5200 KC BFa signal to produce the audio frequency product desired. The audio frequency signal passes through the AF GAIN control for level control, and is amplified to speaker power level by audio amplifier tubes V5B and V6.
The intermediate frequency Signal fed to the AVC amplifier/detector stage (VIO) is amplified further and rectified to produce the AVC voltage fed back to the grids of the RF amplifier stage (VI) and the first IF amplifier stage (V3) to control overall system gain for variations in signal level at the antenna.
A sample of the AVC voltage is fed to the grid of the meter amplifier (V4) to display received signal levels on the S-meter.
6·3. TRANSMITTER SECTION.
The audio frequency signal from the microphone is amplified by the two-stage microphone amplifier (V9) with the MIC GAIN control for level control. The amplified audio signal is fed through a cathode follower stage (V8B) to the balanced modulator.
At the balanced modulator the carrier oscillator (V8A) signal is modulated by the audio signal to produce a double sideband suppressed carrier signal centered on 5200 KC. The output of the modulator is fed to the crystal filter where the lower sideband is attenuated and the upper sideband is passed on to the first IF amplifier stage for further amplification.

·13

r-+-I,

RECEIVER

RF

AMPLIFIER

I,!.
“‘”

RECEiVER

~

MIXER

“‘”

CRYSTAL LATTICE
FIL TER

f? ….

FIRST IF
AMPLIFIER

I~ …

SECOND IF

AMPLIFIER

~ ..

PRODUCT DETECTOR

~
“‘”

FIRST
AUDIO AMPLIFIER

/1
‘”
12

Y:~AN

100KC

AVC

CRYSTAL

OSCILLATOR

AVC/AALC
~

‘ .. 12
6AMSA AVClAALC AMPLIFIER
a DETECTOR

‘3
CARRIER OSCILLATOR
a BFO

~r 13
AUDIO OUTPUT
~.13

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1/, I

…..
”

80M
I ~ 20M

1 ‘I ISOM,20M) ‘2 14OM )

‘I ISOM,20M) 1;
‘2 14OM )

METER AMPLIFIER

SPEaAKER
PHONES JACK

HETERODYNE MIXER
OSCillATOR ‘2

12 ~ 17 Lt> 12

/’
“s” METER-RECEIVE
OUTPUT METER – TRANSMIT

1/ ‘3

L po I,
I,

‘po I I

Lt> 15

OUTPUT METER
DETECTOR IN 191

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TO VOX CON TROl UNIT HA-16

TRANSMITTER

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TRANSMITTER DRiVER

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AMPLIFIER

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MICROPHONE AMPLIFIER

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MIXER RECEIVER MIXER
TRANSMITTER MIXER
HETERODYNE MIXER/OSC PRODUCT DETECTOR

MIXER FUNCTIONS

BAND

MIXER PRODUCT

80M

12(USB)~,I-

40M

12IUSB)~’-,

20M

12 !USB)~f,

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BANDS

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SYMBOLS

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FREQUENCYIAMATEUR BANDS 80M,40M,20M)

12~ IF~ 5200 KC I USB)

13~ RECEIVER AUDIO

14~TRANSMIE

AUDIO

15~ACL

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‘I~VFO

INJECTION IS700KC- 9200KC)

‘2~HETRODYN

MIXER INJECTION 112.1 MC-12.6 MC)

‘3~CARIE

OSCILLATOR ~ 5200 KC

SIGNAL PATH LEGEND

–b- TRANSMITTER SIGNAL

~

RECEIVER SIGNAL

– COMMON SIGNAL -7- OSCILLATORS

From the IF amplifier stage the signal is fed to the transmitter mixer stage (V13) where it is heterodyned with the VFO signal on the 80M and 20M bands or with the product of the VFO and the heterodyne crystal oscillator on the 40M band to produce the desired transmitter frequency.
The signal, at output frequency, from the transmitter mixer is then amplified by the transmitter driver stage (V14) and the power amplifier stage (V15 and V16) and fed to the antenna through the antenna relay.
The RF output voltage is metered by the S-meter for “tune-up” and monitoring purposes by dividing down the RF voltage level, rectifying it and feeding the DC voltage to the grid of the S-meter amplifier tube (V4B).

The tuned circuits of the transmitter mixer and driver stages are selected by the BAND SELECTOR switch and tuned by the DRIVER TUNE control. The power amplifier output tuned circuit is selected by the BAND SELECTOR switch and tuned by the FINAL TUNE control.
The Automatic Audio Level Control (AALC) circuitry operates in the following manner. When a small amount of “flat-topping” occurs in the final amplifier, a ripple voltage at audio frequency develops on the amplifier grid bias line in proportion to the amount of “flat-topping.” This audio signal, which is not present without final amplifier “flattopping,” is coupled to the AVC/AALC amplifier tube V10 whose output is a rectified DC voltage. The resulting DC voltage, which is in direct proportion to the degree of “flat-topping” occurring in the final amplifier, is fed to the firstIF amplifier grid as gain control bias.

SECTION VII

SERVICE DATA

7·1. CHASSIS REMOVAL.
To remove the chassis from the cabinet, remove the four cabinet screws at the bottom near the cabinet feet, and carefully slide the chassis and panel assembly out from the front of the cabinet.
7·2. TUBE AND DIAL LIGHT REPLACEMENT.
Access to the dial light and all tubes may be obtained by removing the chassis from the cabinet. See paragraph 7-1.
7-3. TROUBLESHOOTING.
In the design of this transceiver, full consideration was given to keep maintenance problems at an absolute minimum. As in all well-designed electronic equipment, maintenance and repair problems are generally confined to the checking and replacement of tubes and semiconductor devices which may become defective. Malfunctions of this nature are usually easily isolated and corrected. However,it is entirely possible that a more obscure malfunction may arise. In this event, only thoroughly trained technical personnel should attempt to service equipment of this complexity.
A recommended aid to troubleshooting the Model SR-160 Transceiver is ageneral- coverage receiver which can be used to provide a quick check on the various oscillator circuits within the SR-160. A lead connected to the antenna of this receiver, when placed in the proximity of the

oscillator tube in the circuit to be checked, can determine the presence or absence of signal from the stage in question.
If a malfunction occurs when operating on one particular band and/or mode of operation, the unit should be checked on all other bands and in all other modes of operation to isolate the difficulty. A careful study of the block diagram (figure- 9) will give a quick clue as to which tubes should be checked. The voltage and resistance charts (figures 10 and 11) and schematic diagram (figure 20) will also aid in isolating and correcting a malfunction.
7-4. SERVICE AND OPERATING QUESTIONS.
For further information regarding operation or servicing of the Model SR-160 Transceiver, contact the dealer from whom the unit was purchased. The Hallicrafters 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 purchase 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 warranty, repairs will be made for a nominal charge. All Hallicrafters Authorized Service Centers display the sign shown on the following page. For the location of the one nearest you, consult your dealer or your local telephone directory.

-15

Make no service shipments to the factory unless instructed to do so by letter, as The Hallicrafters Company will not accept responsibility for unauthorized shipments.
The Hallicrafters Company reserves the privilege of making revisions in current production of equipment, and assumes no obligation to incorporate such revisions in earlier models.

SECTION VIII ALIGNMENT PROCEDURE

WARNING
LETHAL HIGH VOLTAGE IS PRESENT WITHIN THIS EQUIPMENT. BE CAREFUL WHEN INSTALLING THE UNIT, WHEN MAKING BIAS ADJUSTMENT, AND WHEN PERFORMING CHECKS UNDER THE CHASSIS.
8-1. GENERAL.
The Model SR-160 Transceiver has been accurately aligned and calibrated at the factory and, with normal usage, will not require realignment for extended periods of time. Service or replacement of a major component or circuit may require subsequent realignment, but under no circumstances should realignment be attempted unless the malfunction has been analyzed and definitely traced to mis-alignment. Alignment should only be performed by persons experienced in this work, using the proper test equipment.
NOTE
Do not make any adjustments unless the operation of this transceiver is fully understood and adequate test equipment is available. Refer to figures 12 and 13, the top and bottom views of the transceiver, for the locations of all adjustments.
8-2. EQUIPMENT REQUIRED.
1. RF Signal Generator; Hewlett-Packard Model 606A or an equivalent signal generator having up to 1 volt output at an impedance of 70 ohms or less. Throughout the alignment procedure, unless otherwise specified, the signal generator output is unmodulated.
2. A Vacuum Tube Voltmeter (VTVM); Hewlett-Packard Model 410B,orequivalent VTVM having an RF probe good to 30 MC.

3. A dummy Load; 50 ohms non-reactive, rated at 100 watts. Bird Wattmeter or equivalent. The load may be made up of carbon resistors totaling 100 watts dissipation.
4. A DC Voltmeter having a 2.5-volt or 3.0-volt scale for final plate current measurements when using the Model PS-150-120 Power Supply or a 0-300 MA DC milliammeter when using the Model PS-150-12 Power Supply.
5. AF Signal Generator; Hewlett- Packard Model 200 AB, or equivalent.
6. Ballantine voltmeter or equivalent, capable of measuring 1 to 4 millivolt level.
7. A general-coverage receiver covering the frequency range from 3 MC to 30 MC with a 100-KC calibrator.
8-3. BIAS ADJUSTMENT.
The final amplifier bias, must be properly set before any extensive checks are made on the transmitter portion of the Model SR-160.
1. When using the AC power supply (PS150-120), proceed as follows:
a. Before turning the transceiver on, connect a DC voltmeter to the two jacks on the power supply (see figure 15), positive to red andnegative to blue. Set the voltmeter on a low scale (2.5 volts or 3.0 volts). There is a 10-ohm resistor across the tip jacks so that the meter will indicate 1 volt for 100 milliamperes, 2 volts for 200 milliamperes, etc.

16-

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12D06B

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0/245 NC

12.6 AC H NC

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VI 12AW6 RECEIVER RF AMPL H

12.6 AC

H

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NOTES:
POWER SOURCE-MODEL PS-150-120 LINE VOLTAGE 117 VAC. ALL MEASUREMENTS TAKEN FROM TUBE SOCKET PIN TO CHASSIS. ALL VOLTAGES SHOWN ARE POSITIVE DC UNLEsS OTHERWISE SPECIFIED. DATA TAKEN WITH ELECTRONIC TYPE VOLTMETER. ALL READINGS,EXCEPT GRID VOLTAGES, MAY BE OBTAINED WITH A 20,000 OHM PER VOLT METER.

UNLESS OTHERWISE SPECIFIED, THE FIRST VOLTAGE LISTED IS FOR RECEIVE CONDITION AND THE SECOND VOLTAGE IS FOR TRANSMIT CONDITION IZERO SIGNAL)

NC – NO CONNECTION. III OPERATION CONTROL SET AT CAL. (4) VOLTAGE SHOWN FOR SS B POSITION OF

(2) TYPICAL VOLTAGE, VARIES WITH BIAS

OPERATION CONTROL ONLY.

ADJ. SET TlNG.

15. VOLTAGE VARIES WITH CRYSTAL ACTIVITY.

(3) VOLTAGE VS BAND SELECTOR SETTING (6)VOLTAGE VARIES WITH R F GAIN

~C.;rALE

46~R

80M/20M,SECOND

CONTROL SETTING.

o
100 G2

-I

GI

12.6 AC NC
P 2BO/265 7
G2 0/195 8 G3 0

V5 12AX7A/ECCB3
PRODUCT DET S 1st AUDIO AMPLHTI 12.6AC

o

150

6.3 AC

GTI 0

1.25

1510

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0/-100

12.6AC P 280/270
6 G2280/270 NC

V4 6EA8
2nd I F a METER AMPL H 0

6.3 AC 751260 G2 01-100 GI 280/270 PT

260/270
K G3 0.75/0
9.5/9.1
o

VIO 6AMBA AVC/AALC AMPL S DETECTOR H 12.6A’

6.3 AC

95

G2

o

GI

1.7

165 15/0 0/-0.7
1.7

VI2
OA2 VOLTAGE REGULATOR K NC

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150

o

NC

150

NC

6.3 AC
0.5 9
o

0 235 G2 115

12.6 AC

3.5

KT2

-30 240

H 0 (4)
KTI 0/5 NC

0 0 -0.7 50

V9 12AT7 MICROPHONE AMPL H 12.6 AC
160 0
2.7 NC

2200 NC 0 NC

V 15 12D06B XMTR PWR AMPL
5

47K 2200 NC NC
0 0 0 7K

VI6 12DQ6B XMTR PWR AMPL

47K 0
NC 0 0 1I0K 0 0

VI 12AW6 RECEIVER RF AMPL
0
(31180-IOK
5.SMEG

0 39K 135K 180-IOK(3)

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130K

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0 260K(6)

4700

140K16)

220K

4700

o

o

33K

o

48K

57K(4)/33K(S)

47K

NOTE:
UNLESS OTHERWISE SPECIFIED RESISTANCE VALUES ARE SHOWN FOR THE FOLLOWING CONTROL SETTINGS
-REC ONLY CTOR- 80M
ccwWwIMIN)
MIC GAIN -CCW
ALL MEASUREMENTS ARE MADE FROM TUSE SOCKET PIN TO CHASSIS. READINGS LESS THAN ONE OHM ARE SHOWN AS ZERO.

o

o

45K

270

56K

47K

S6K

RESISTANCE MEASuREMENTS MADE WITH POWER

PLUG DISCONNECTED.

NC- NO CONNECTION

1(I2))–VRAERAIDEISNGWIFTOHRSsEsTeTINSGETOTFINMGICOGF AIN CONTROL

OPERATION CONTROL.

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(5)-READING FOR 40M SAND. (6)-READING FOR CAL POSITION OF
OPERATION CONTROl.

47K 35K

V5

0

a 12AX7A/ECCS3
PRODUCT DET 1st AUDIO AMPL

0

V6

6A05A

AU D 10 OUTPUT

0

NC 0

135K

0

35K

35K 0

1000

4300 6.3MEG

390 1000

35K

0 260K

NC

800K

NC

0 220K 375K 35K

V4 6EA8
a 2nd I F METER AMPL

0
38K 100 1700 2AMEG

VIO

6AMSA

a AVC/AALC AMPL DETECTOR

0

0 200K
95K 270

S6K 390
3.5MEG 270

0
39K 20
1500 220K

0 40K 50K 100

NC

NC

35K

0

NC

3SK

NC

0 820
lOOK 47K

0 35K(2) SOOK
4700 NC

0 0
2.2MEG 320K

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12AT7

MICROPHONE AMPL

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4700 NC

b. Set the OPERATION switch at REC ONLY and allow approximately ten minutes for the unit to warm up. Then set the OPERATION switch at SSB, the MIC GAIN full CCW, and press the microphone switch to close the relays.
c. Adjust the bias for 60 milliamperes idle plate current with the BIAS ADJ. control (R206) on the power supply (0.6 volt on the voltmeter scale).
2. When using the DC power supply (PS150-12), proceed as follows:
a. Disconnect the high voltage lead (red/white) from the power supply terminal strip (terminal I).
b. Connect a DC milliammeter (0-300 MA) between the lead and the high voltage terminal on the power supply.
c. Follow the procedure outlined in the preceding paragraph (step b) and set the BIAS ADJ. control (R308) on the power supply for 60 milliamperes.

8-4. S-METER ZERO ADJUSTMENT.
Periodically the meter should be zero set to maintain accuracy. To accomplish this proceed as follows:
1. Set the OPERATION control at REC ONLY, and the RF GAIN control fully counterclockwise. Allow about 15 minutes for the equipment to stabilize.
2. Turn the METER ZERO ADJ. control (R76) until the meter pointer is directly over the end calibration mark at the left end of the meter scale. The control is located on the rear chassis apron.

8-5. CARRIER BALANCE.

Adjust the carrier balance as follows:

1. The equipment should be allowed to

reach operating temperature before

making the carrier balance adjustments.

Remove the chassis unit from the cabinet

as described in paragraph 7-1. With the

chassis re~ting

on the table, right side

up, and connected to a dummy load or

antenna load, tune the unit for SSB

operation.

2. Turn the MIC GAIN control fully counterclockwise to remove all audio from the modulator stage. With the OPERATION control set at SSB, close the microphone switch and adjust the CARRIER BAL controls (capacitor C51 and potentiometer R45) for minimum S-meter reading. With an antenna or dummy load connected to the Model SR-160 the meter will drop to zero near the null. Release the microphone switch.
3. Disconnect the antenna load and again close the microphone switch and repeat the balance adjustment. The meter will still drop to zero but will be more sensitive with the load removed. Take care not to feed excessive carrier through the system with the load removed.
8-6. CRYSTAL CALI BRA TOR ADJUSTMENTS.
If a 100-KC crystal unit and the 12AU6 tube (V7) have been installed in the Model SR-160, the following adjustments apply:
The crystal calibrator trimmer (C45) is used to set the 100-KC crystal exactly to frequency by comparing its harmonic frequency with the signal transmitted by station WWV.
With a general coverage receiver, tune in station WWV and connect a lead between the Model SR-160 REC ONLY antenna connector and the antenna connector of the external receiver. Set the OPERATION control at CAL and carefully adjust the calibrator trimmer (C45) until the 100-KC oscillator harmonic is at zero beat with station WWV. This adjustment should be made only during periods of NO modulation on station WvvV’s signal.
8-7. FINAL AMPLIFIER NEUTRALIZATION.
1. Neutralization Check
Connect a voltmeter to the AC supply or a milliammeter to the DC supply to meter the final amplifier plate current as described in paragraph B-3. With the Model SR-160 inits cabinet (all hardware in place) and connected to adummyload, tune the unit at14,150 KC in the CW mode as described in paragraph 5-4. Adjust the CARRIER control for 50 volts RMS output (apprOximately S-9 on the S-meter if an RF voltmeter is not available). Carefully tune the FINAL TUNE control through resonance and observe the plate current dip and output voltage maximum. If both occur at the same setting, the amplifier is neutralized.
-19

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R99 TI

CI18 VI4
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L5 L6 L7 L3 L2
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YI (NOT SUPPLIED)

DSI

VI3

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R55

The neutralizing circuits may be checked on 80M and 40M by switching bands and tuning at the same VFO dial setting.
2. Neutralizing the Model SR-160
If the check outlined above indicates a need for neutralization, remove the unit from the cabinet. (Refer to paragraph 7-1.) Use the setup as for the neutralizing check and tune the unit at 14,050 KC. Adjust neutralizing capacitor CllO in 1/2 turn or 1/4 turn steps until neutralization is accomplished. Recheck at 14,150 KC with the unit mounted in the cabinet as described above.
HIGH VOLTAGE APPEARS ON THE ADJUSTMENT SCREW OF THE NEUTRALIZING CAPACITOR AT ALL SETTINGS OF THE OPERATION CONTROL EXCEPT OFF.
8-8. VFO MECHANICAL INDEX.
If the pointer position has been disturbed, check the pointer alignment as follows:
1. Loosen the dial stop lock nut and backoff the dial stop screw. (See figure 12.)
2. Carefully turn the dial beyond 3500 KC until the VFO tuning capacitor rotor stop contacts the stator plates. Exercise care in this operation as the gear train provides enough mechanical advantage to lift the rotor plates out of their mounting.
3. The pointer should line up with the index mark on the dial located to the right of the 3500 KC dial calibration. Shift the pointer position or, if necessary, center the pointer in the window opening and loosen the capacitor drive gear irom the capacitor shaft and relocate as required. Retighten the set screws.
4. Turn the dial clockwise beyond the dial stop and reset and relock the dial stop screw. Check for clearance between the dial and the screw end. It should be approximately equal to one-half the dial stop spacer thickness.
8-9. VFO CALIBRATION ALIGNMENT (Trimmer
adjustment only).
A trimmer capacity correction is indicated if the dial calibration check across the dial, at the 100-KC check points, conSistently falls to one side of the pointer and cannot be corrected by the DIAL CAL control range.

Recalibrate the VFO as follows ifthe 100-KC marker crystal has been set up as outlined in paragraph 8-6.
1. Set the BAND SELECTOR at 80M, the OPERATION control at CAL and the RIT control at OFF.
2. Center the DIAL CAL control. The dot on the knob should fall at top dead center.
3. Set the dial at exactly 4000 KC and carefully adjust trimmer C127 for zero beat. Care should be exercised to make sure that the correct 100-KC beat is tuned in with the trimmer.
4. Check across the dial at the 100-KC check points. If the frequency error is less than approximately 3000 CPS, the calibration is within acceptable limits. If the error increases and exceeds 3000 CPS at the low frequency end of the dial, the VFO will require a coil adjustment in addition to the trimmer adjustment.
NOTE
If the Model SR-160 calibrator circuitry is not set up for the calibration check, the VFO signal may be picked up with a general coverage receiver tuned to the 8700 KC to 9200 KC VFO tuning range. The receiver used must be equipped with an accurate crystal calibrator.
8-10. VFO CALIBRATION ALIGNMENT (Trimmer
and coil adjustment).
If the check carried out in paragraph 8-9 (step 4) indicates a need for both trimmer and coil adjustment, proceed as follows:
1. Check the pointer alignment at the index mark on the VFO dial as described in paragraph 8-8. Be sure to reset the dial stop.
2. Set the BAND SELECTOR at 80M, the OPERATION control at CAL, and the RIT control at OFF.
3. Center the DIAL CAL control. The dot on the knob should fall at top dead center.
4. Set the dial at 4000 KC and adjust trimmer C127 for zero beat.
5. Set the dial at 3500 KC and adjust coil L18 for zero beat.
-21

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SIA LI L5 LS R9S LIS J4

C39 KI CI37 R45 CR2 CR7 CR3 Y2 CRI S28 S2A

6. Repeat steps 4 and 5 until both the 4000-KC and 3500-KC settings are exactly on frequency.
7. Check the calibration across the dial at the 100-KC points. If the frequency error is less than 3000 CPS, the calibration is within acceptable limits. If the error is in excess of 3000 CPS at any ofthe midpoints, with the end limits atzeroerror, the VFO capacitor Cl30 should be “knifed.” This operation should not be attempted by other than qualified personnel, thoroughly familiar with the technique.
NOTE
If the Model SR-160 calibrator circuitry is not set up for the calibration check, the VFO signal may be picked up with a general coverage receiver tuned to the 8700-KC to 9200-KC VFO tuning range. The receiver used must be equipped with an accurate crystal calibrator.
8-11. HETERODYNE MIXER/OSCILLATOR BAND-PASS TRANSFORMER ALIGNMENT.
Before changing the core settings in transformer T8, check the injection voltage between the junction of capacitors C80 and C81 and ground. (Test point A.) The VFO calibration must be within acceptable limits before adjusting this transformer. The following procedure should be used to check and adjust the transformer.
1. Set the OPERATION control at REC ONLY and the BAND SELECTOR at 40M.
2. Connect the VTVM probe to the test point A and ground clip to the chassis.
3. Tune the VFO from 6900 KC to 7400 KC and note the variation in injection voltage. A correctly adjusted transformer will produce equal voltages at 6900 KC and 7400 KCandequal amplitude peaks within the tuning range. The injection level at this test point will run 1. 5 volts RMS to 1.8 volts RMS. SWitching to 80M will produce approximately 2.0 volts RMS from the VFO directly at the test point.
4. To adjust the transformer for equal injection voltages at 6900 KC and 7400 KC, set the VFO dial to the frequency of lowest injection voltage and turn both cores into or out of their respective

coils as required to raise the lower voltage to a new level half way between the two voltages noted. Repeat the process until both dial frequencies produce equal injection voltages.
5. To adjust the transformer for equal peak response voltages within the passband, set the dial to the frequency of lowest peak response voltage and adjust the cores in equal steps to produce a new peak voltage approximately midway between the original voltage levels noted. If one core is turned into its coil, turn the other core an equal distance out of its coil.
6. The adjustments in steps 4 and 5 interact upon each other and require that the steps be repeated. Keep in mind that the passband is shifted in frequency by turning both cores into or out of their coils in apprOximately equal amounts and that the response peaks are equalized by turning one core into its coil and the other out of its coil in approximately equal amounts.
Do not misadjust the cores so that they rest in between the two windings.
8-12. BFO/CARRIER OSCILLATOR TRANSFORMER ALIGNMENT.
With the unit operating in the REC ONLY pOSition of the OPERATION control, connect the probe of the VTVM to test point B, ground clip to chassis. If the voltage measured is approximately 1.0 volt RMS no adjustment is required.
If adjustment is required, set the core of transformer T6 for approximately 90 percent of the peak voltage obtained on the high frequency side of the peak setting of the core, that is, turn the core counterclockwise from the peak output voltage setting.
8-13. BFO/CARRIER OSCILLATOR FREQUENCY ADJUSTMENT.
Transformer T6 should be in proper alignment before setting the carrier oscillator to frequency. The oscillator frequency may be adjusted with warping trimmer C48 to exactly 5200 KC. The carrier oscillator signal may be picked up in a general coverage receiver equipped with a 100-KC calibrator known to be correlated with station WWV. Obtain zero beat between the carrier oscillator signal and the 100-KC calibrator in the receiver. Do not use the BFO in the general coverage receiver.
-23

8-14. ALIGNMENT OF TRANSMITTER MIXER AND DRIVER STAGES.

The final amplifier bias adjustment must be properly set as in paragraph B-3 before extensive operation of the transmitter is attempted. It is assumed that the 5200-KC signal generating stages of the Model SR-160 are functioning properly. Using the internally generated signal of the transmitter, the mixer and driver stages are aligned as follows:

1. Connect a 50-ohm dummy load to the COMMON ANTENNA jack, J5. Set the OPERATION control at CW-TUNE with the CARRIER control set for minimum output.
2. Set the BAND SELECTOR at BOM, the VFO dial at 3500 KC, and the DRIVER TUNE control at approximately 30° clockwise from its CCW stop.
3. Advance the CARRIER control and adjust the FINAL TUNE control for resonance in the 80M panel segment. Maintain an output Signal level of 50 volts RMS across the 50-ohm load or apprOximately S-9 on the output meter as the alignment progresses.
4. Adjust cores of coils L5 and LB for maximum output meter reading.
5. Set the VFO dial at 4000 KC and adjust the DRIVER TUNE and FINAL TUNE controls for maximum output. Note the position of the DRIVER TUNE control. If its settings at 3500 KC and 4000 KC fall an equal distance from the limits of knob rotation the alignment is complete for this band. If not, change the 3500 KC DRIVER TUNE position slightly, repeak cores L5 and LB and again recheck the 4000 KC setting. Repeat the procedure until the tuning range centers within the rotational limits of the control.
The 80M coils are common to the 40M and 20M band circuitry, therefore, they must be in alignment before these last two bands can be aligned. Repeat the above procedure for each band referring to the tuning chart for the appropriate data.
TRANSMITTER TUNING CHART

Band
80M 40M 20M

Final Tune Segment
80M 40M 20M

Ad;ust Coils

Ad;ust

For

Coils At Maximum Output

3500 KC L5 L8

6900 KC L6 L9

73900 KC L7 L10

Check Driver Tune Setting
At
4000 KC
7400 KC
74400 KC

24·

A neutralization check (paragraph B-7) is recommended following alignment of the mixer and driver stages. If a major neutralization adjustment is required, recheck the alignment.
8·15. ALIGNMENT OF RECEIVER ANTENNA STAGE,
The transmitter mixer and driver stages must be in alignment before the receiver antenna stage can be adjusted. The BOM band coil is common to the 40M and 20M band circuitry, therefore the 80M band must be aligned first. The alignment procedure for the antenna stage coils is as follows:
1. Connect the 50-ohm dummy load to the COMMON ANTENNA jack (J5), the RF Signal Generator to the REC ONLY ANTENNA jack (J6), and set the antenna switch at SEPARATE (up). If an AC voltmeter is connected across the speaker circuit, maximum audio output can be monitored visually.
2. Set the OPERATION control at REC ONLY, RF GAIN at maximum, AF GAIN as required.
3. Set the OPERATION control at CW-TUNE and tune the transmitter at 3500 KC (80M band). Adjust the DRIVER TUNE control carefully as outlined in paragraph 5-4.
4. Set the OPERATION switch at REC ONLY and adjust RF signal generator for apprOximately 1000 CPS audio beat note. Use just enough signal generator output to keep from developing AVC voltage at test point C. (ApprOximately 1 microvolt for an aligned unit.) Adjust coil L1 for maximum audio output without developing AVC voltage.
5. Repeat the alignment procedure outlined in steps 3 and 4 for the 40M and 20M bands. On 40M, tune the transmitter at 6900 KC and adjust coil L2. On 20M, tune the transmitter on 13900 KC and adjust coil L3.
8·16. ALIGNMENT OF FIRST IF AMPLIFIER STAGE.
To adjust the core of coil T3 in the plate circuit of the first IF amplifier tube, tune the transmitter at approximately 3800 KC into the dummy load, following the procedure outlined in paragraph 5-4. With the CARRIER control adjusted for a carrier output level of 50 volts RMS (S-9 on the output meter) or less, adjust the core of coil T3 for maximum RF output. Back off the CARRIER control setting if the output level exceeds 50 volts RMS during adjustment.

8-17. ALIGNMENT OF SECOND IF AMPLIFIER AND AVC AMPLIFIER STAGES.
Coil T4 in the plate circuit of the second IF amplifier tube and coil T7 in the plate circuit of the AVC/AALC amplifier tube are adjusted in the receive mode as follows:
1. Connect the RF signal generator to the REC ONLY ANTENNA jack (J6). Connect an AC voltmeter across the speaker circuit.
2. Set the OPERATION switch at REC ONLY, RF GAIN control at maximum, AF GAIN control as required and tune the RF signal generator and receiver to 3800 KC for apprOximately a 1000CPS audio beat note.
3. Use just enough signal generator output to keep from developing AVC voltage at test point C, and adjust the core of coil T4 for maximum audio output.
4. Increase the RF Signal generator output until AVC voltage equal to apprOximately minus one volt appears at test point C and adjust the core of coil T7 for maximum AVC voltage.
8-18. CRYSTAL FILTER ALIGNMENT.
The filter alignment consists of adjusting the impedance matching transformers, T1 and T2 associated with the hermetically sealed crystal filter unit FLl.
1. The filter response should be checked as follows before any termination adjustments are attempted.
a. Tune the transmitter for SSB operation on 3800 KC into a dummy antenna load.
b. Connect the AF Signal generator to the MIC connector and monitor the input voltage with the Ballantine voltmeter. Set the AF signal generator at 1000 CPS and adjust the

generator level for 50 volts RMS RF output with the MIC GAIN control set near maximum gain.
c. Maintain constant AF signal generator input voltage and change the frequency of the generator above and below 1000 CPS, recording the frequency at which the transmitter RF output voltage drops to 35 volts RMS (-3 DB). Also note the maximum and minimum RF voltage excursions between these two frequencies. A normal 3-DB frequency response will run 400 to 600 CPS at the low end, 2700 to 3500 CPS at the high end, and less than 2-DB variation (10 volts RMS change) in the passband.
2. If the check made in step 1 indicates a need for filter termination adjustment proceed as follows:
a. Disconnect the crystal filter unit (FL1) input and output wires at the filter terminals. Connect a 270, OOO-ohm resistor between the wires lifted from the filter terminals.
b. Tune the transmitter for CWoperation on 3800 KC into a dummy antenna load.
c. Set the CARRIER coni.:rol for apprOximately 10 volts RMS RF output at the dummy load, and adjust the cores of transformer T1 and coil T2 for maximum RF output.
d; Remove the reSistor and reconnect the filter. Check the filter response as outlined in step 1. If a major change occurred in the core setting of coil T2, recheck the alignment of the first IF amplifier stage coil T3. (See paragraph 8-16.)

.25

SECTION IX

AC POWER SUPPLY MODEL PS-150-120

092-017846
Figure 14. Hol/icrofters Model PS-150-120 AC Power Supply.
9-1. DESCRIPTION.
Hallicrafters’ Model PS-150-120 Power Supply is a complete, self-contained power unit designed to permit Hallicrafters’ Model SR-160 Transceive r to be operated from a nominal 117volt AC source. This power supply, through a 12-pin power plug and cable at the rear, will furnish all the supply voltages necessary for optimum performance of the SR-160_
Hallicrafters’ Model PS-150-120 operates from a 105-volt to 125-volt, 50/ 60 cycle, AC source. The power supply also contains a 3.2ohm permanent-magnet type speaker which connects to the SR-160 through the 12-pin power plug and cable.
WARNING
LETHAL IDGH VOLTAGE IS PRESENT WITIDN TIDS EQUIPMENT. BE CAREFUL WHEN INSTALLING THE UNIT, WHEN MAKING BIAS ADJUSTMENTS , AND WHEN PERFORMING CHECKS UNDER THE CHASSIS.
9-2 . BIAS ADJUSTMENT
After connecting the power supply to the SR-160 and to the proper power source, the transmitter bias must be adjusted to achieve optimum performance of the transceiver.
1. Connect a voltmeter to the tip jacks at the top rear of the power supply chassis. (Connect the positive lead from the meter to the red jack.)
26-

2. Turn the Model SR-160 on: OPERATION switch to SSB.

3. With no signal applied to the transmitter and the microphone button depressed, adjust the BIAS ADJpotentiometer, R206 on the rear of the power supply chassis, for 0.6 volt on the meter.

4. Disconnect the meter after turning the equipment off.

This adjustment is not necessary each time the SR-160 is used; however, it should be checked periodically and whenever the transmitter final amplifier tubes are replaced.

9-3 . CHASSIS REMOVAL.

To remove the PS-150-120 chassis from its cabinet, remove the six hex-head screws on the bottom (four are in the feet and two are at the center front and rear) and disconnect the speaker leads on the top rear of the chassis. The chassis will slide out the rear oJ the cabinet.
REPAIR PARTS LIST

Schematic Symbol

Description

Hallicrafters Part Number

C20l,202
C203
C204A&B
C205,206
C207 ,208
CR201 ,202, 203,204 CR205 F201
J201 L201 L202 L203 R201 ,202
R203
R204
R205
R206
R207
T201 TP201 TP202

CapaCitor, 0.011l F, 1400V, Ceramic Disc
Capacitor, 0. 001 Il F, 3000V, Ceramic Disc
Capacitor, 2 x 30 Il F, 350V, Electrolytic
Capacitor, 80 Il F , 450V, Electrolytic
Capacitor, 20 Il F , 250V , Electrolytic
Diode, Silicon, Type 1N3487
Diode , 1N3194 Fuse, 3 Amperes , 125 Volts,
3AG, (Slow Blow) Connector, Power (12- pin) Choke, Filter Choke, Filter Choke, Filter ReSistor, 15K Ohms , 10%, 10 watts ,
Wire Wound ReSistor , 100 Ohms, 10%, 1/ 2 watt,
Carbon Resistor , 4700 Ohms , 10%, 2 watts,
Carbon ReSistor , 22K Ohms, 10%, 1 watt,
Carbon ReS istor, Variable, 10K Ohms,
20%, 3/ 4 watt, Bias Adj . Resistor, 10 Ohms, 5%, 1 watt ,
Carbon Transformer, Power Tip Jack, Red Tip Jack, Blue Baffle Board Baffle, Felt Cabinet Cable (9 – conductor) Cable Assembly Cable Clamp Foot, Plastic (4) Front Panel Fuse Holder Line Cord Lock, Line Cord Rear Panel Speaker, 4 x 6 inch PM,
3.2 Ohms

047-200752
047-100397
045-000902
0 4 5 – 0 0 0 369
045-000903
027 -000314
019 -002769 039-100390
010-002613 056 – 000595 056-000585 0 5 6 – 0 0 0 501 445-032153
451-252101
451 – 652472
451-352223
025-002330
451-351100
052-001007 036-000304 036-000307 078-001711 014-000476 066-003437 087-007657 087-007648 076-202746 016-201072 068-001263 006-200837 087-104690 076-100953 068 -00 1404 085-000218

()

~o

o

R206 BIAS ADJ
F201

Figure IS. Top Cha ssis View of Model PS·150·120 AC Power Supply .

092. 017845

C201 0 .01 1400V
F201 3AMP SLO BLO

T201

C20 2 0 .0 1 14 00V

117 VAC 50 /60 CYCLES

L201

L 202

T C204A
30
:t- 350V-
L203

250V @ 175MA
C204B
-T;~ov
RED BLJE TP201 TP202

C205 BO
450V –

R203

10 0

R204

CR205 1/2W -IBOV 4 .7K,2W

C206 BO
– 125V 6 . 5MA

IN31 94

C207

R206

20 +

10K

250V ‘—-=;…=-‘—-<….’VV’.r BIAS ADJ.

12 [:::::J

4
10 [:::::J

12 . 6V AC

4.5AMPS

NOTES : UNLESS OTH ERWI SE STATED : I. ALL CAPACITO RS SHOWN IN UFo 2. ALL RESISTORS SHOWN IN OHMS, 10% . 3. AL L VOLTAGES NOMINAL.

Figure 16 . Schematic Diagram of Model PS·150· 120 AC Power Supply.

089. 003011 C
·27

SECTION X DC POWER SUPPLY MODEL PS-150-12

092·017844
Figure 17. Hol/icrofters Moclel PS-ISO-12 DC Power Supply.
10-1. DESCRIPTION.
Hallicrafters’Model PS-150-12 Power Supply is a complete, compact, self- contained power unit designed to permit Hallicrafters’ Model SR-160 Transceiver to be operated from a nominal 12-volt DC source. This power supply is shipped for operation in conjunction with a negative-grounded power source. However, it is operable with a positive grounded source by changing two internal soldered connections as described in figure 19.
The Model PS-150-12 Power Supply, is designed to operate from a 11.6 volt to 16.0 volt DC source with 13.6 volt as nominal voltage.
All connections are made to the power supply through two terminal strips on one side of the unit (see figures 6 and 18). The two-connector strip (TS301) is used for connection to the 12-volt source through the wires supplied. The sevenconnector strip (TS302) is used to supply the operating voltages to the transceiver and connects to the transceiver through the cable supplied with the Mobile Installation Kit Model MR-160 available as an accessory.
WARNING
LETHAL HIGH VOLTAGE IS PRESENT WITHIN THIS EQUIPMENT. BE CAREFUL WHEN INSTALLING THE UNIT, WHEN MAKING BIAS ADJUSTMENTS, AND WHEN PERFORMING CHECKS UNDER THE CHASSIS.
10-2. BIAS ADJUSTMENT.
After interconnecting the power supply to its proper power source and to the transceiver, the transmitter bias must be adjusted to achieve optimum performance of the transceiver.
28-

1. Disconnect the high voltage (red/white) lead from pin 1 of TS302.
2. Connect an ammeter, with a full-scale deflection of 0-300 MA, between the high voltage lead and pin 1 of TS302.
3. Turn the transceiver on: OPERATION switch to SSB.
4. With no signal applied to the transceiver and the microphone button depressed, adjust the BIAS ADJpotentiometer, R308 on the side of the power supply chassis, for a reading of 60 MA on the meter.
5. Disconnect the meter and reconnectlead to pin 1 of TS302.
This adjustment is not necessary each time the SR-160 is used; however, it should be checked periodically and whenever the transmitter final amplifier tubes are replaced.
10-3. COVER REMOVAL.
Remove the nine screws on the top and one side of the unit and lift the cover off. This will provide easy access to all the components in the power supply.
REPAIR PARTS LIST

Schematic Symbol
C301 C302
C303,304, 306 C305 C307,308 CR301,302, 303,304 CR305 F301 F302 K301,302 L301 Q301,302, 303,304 R301
R302
R303
R304
R305
R306,307
R308
R309
T301

Description

Hallicrafters Part Number

Capacitor, 25 J.I. F, 50V, Electrolytic Capacitor, 0.00111- F, 3000V,
Ceramic Disc Capacitor, 40 J.l.F, 450V, Electrolytic

045-000863 047-100397
045-000904

Capacitor, 0.22J.1.F, 10%, 600V, Mylar 046-001376

Capacitor, 20 J.I. F, 250V, Electrolytic 045-000903

Diode, Silicon, Type 1N3487

027-000314

Diode, Type 1N3194 Fuse, 15 Amperes, 23 Volts, 3AG Fuse, 7.5 Amperes, 32 Volts, 3AG Relay Choke, Filter Transistor, Type 2N441

019-002769 039-000707 039-000706 021-000671 056-000555 112-000194

Resistor, 7.5 Ohms, 10%, 10 watts, Wire Wound
Resistor, 220 Ohms, 10%, 2 watts,
Carbon Resistor, 100 Ohms, 10%, 7 watts,
Wire Wound Resistor, 100 Ohms, 10%, 1/2 watt,
Carbon Resistor, 1000 Ohms, 10%, 1/2 watt,
Carbon Resistor, 47K Ohms, 10%, 2 watts,
Carbon Resistor, Variable, 10K Ohms, 20%,
3/4 watt, Bias Adj. Resistor, lOOK Ohms, 10%, 1/2 watt,
Carbon Transformer, Power Cabinet Cover Cable Clamp Clamp, Resistor (R301) Cover, Terminal strip (TS302)
Fuse Holder

445-032075
451-652221
445-022101
451-252101
451-252102
451-652473
025-002330
451-252104
052-000969 066-003454 076-202744 076-004121 066-003574 006-200837

0301-_ K302
– 0303–

– -0302
– -0304

TS301

K301

F301 F302

~

~

- J

TS 302

Figure 18. Internal Top View of Moclel PS-1 50-12 DC Power Supply .

R308
BIAS ADJ

092-01784 3

GREE N
R30 1 7 .5 lO W

T3 01

rs 302

R302 220 ,W

R303 100 7W

~ ~-=

t- C305
T ~O20
BLK

L3 QI NV~-_4r
R3 05 1000

– CR305
IN3194

R30 4 100

BLUE

;- =-: :~6
2w
R30 7
4n
2W – -~o2

-+<>

I 575 v (Q) 200 MA

REO / WHITE ‘# 18

250v

~ 17 5 M A

REO :#I B

R3 0 8
f–,’-O=:K’:-:-::-_-t–o 3
~AJ
R309
lOO K 112 W

-B IAS -7 5 TO 140V fa) 10 MA
WHITE – IS

‘—::i}-;—- t – – – – – – t – – – – – – – – — — – – – – — – – – – – – – – – jf–<>4 SWITCH BLACK/ WHITE -18 “– – – – + – – – – – – – – — — – -__-1–<>5 HTRS BR OWN – 12 .—+–<>6 BLACK * 12
· ,e 07 ORAN GE ( SPARE ‘

NOT ES: I. CAUTI ON : OBSERVE POL AR ITY . 2 . THE WIR ING SHOW N 15 FOR NEGAT IVE GROUN DED VEHICLES . IF THIS UN I T I S INSTALLED I N VE H IC LES HAVING POSITivE GROUNDED BATTERI ES,L EA DS MARKED 3 AND 4 ON TH I S SC HEMATIC M US T BE UNSOLD ERED AN D INTERC HAN GED SO THAT LEAD I CON NECTS wITH LEAO 4 AN D LEA D 2 WITH LEAD 3 ,
Figure 19. Schematic Diagram of Moclel PS-150-12 DC Power Supply.

089- 002979C
-29

NOTES:

VI 12AW6

V2 126E6

V3 128Z6

RECEIVER R F AMPLIFIER

RECEIVER MIXER

FIRST IF AMPLIFIER

R~2′-I=76, CI r-4r____
27*1′.

~JI 2~

*.,r.’.C0I.0O1

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UF -=

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( 180M
R23.52
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f C8A

tGT.!.R4 a2K ,rIOK

R6 10

DRIVER
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IR F GAINI

~0.2

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AVIC

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____~

7~6

, ~’R9 R7
56K Re

2

47K

C;; ~

270 .”. 0,01 UF

R

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r- Fi6 -~ -TI–,

FL I

R[O
22K
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~,CI4
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21

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ILATTICEL

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CR I
IN295

RI2 RI3 10K 10K
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CARRIER

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b~IATOR;

~
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R36 OSCILLATOR 82 r

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R38 i<8C·4550 220K fl

OSCILLATOR

r-~R37

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– 0.001
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V4 5 4

V9
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VIO
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lI ‘

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r – HETERODYNE

R79

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r-
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t-S,C.~’5
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–, CIII

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.:::M”‘H-++–+l+A..::P-‘P..:R:.:O”‘X–..:5:.:5:..:VcD:cC:’ – – 1 f – – – _ ,

~

CI14

I

*+ 0

.005
UF

~j
L!4 RFC

FINAL TUNE

2r – :I

Ll6
I MH
r .=-=t

4 3 VI
4 3 VII
3 4 V7
3 4

COMMON

~

ANTENNA

o SEPARATE
S4

DDIASIL
LAMP

FT CI23 0.001 UF
1-1I~=UF’t

11220K RIOB 1500
. 4R7II06K
g.~l
t

°UO?t CI26

J,47K 510

68~ ~H_L17

CI32

C R 5 · VARICAP

510
,.,===1-:1 ~ Ll81

~~ 1_2~ t

IFREOUENCYI
N~O N~O CI29 CI30 C133

– ~:=-t

~ __~=+240:VDC-;tO±jJ

~

:i’3~6

T –0—1

J2

5%

~I : KO

+n5V~

~ T

6R8~0

5%

I~

C6~0:f

5%

UF ‘

~-t:=j1r[!’~901 lJF ;fI<J+——-..:;II.,~ 12 I 3

L~-_c,.:’T=8*·7 + 275 voc

IOPERATIONls2A h1.-0,~ i

.:-~ 5′–……… _

— -_, ,,

~

1~5

~

I

…. 61’ . ‘

b,..;.;+,;;1;5;.0.;.V;;D.C;;__+-======== _-~,

rE gg .~ 7L_~4 CI~lf37. .—-

R97 IBOK

I~ iiiALl

98

lEi!
R99 HI

IRIT CONTROLi
@ill ~S-3_+1c!4”

8

25K

~

2

5
([;2]

K(“” IQTI)

2R71

1.’.

.

.

.

R ~
.

____~T -;:I~_.

I 9

T

RI06 1

I
I ·
I I
“-__.?~+-g_4A . .j i

I

J5 COMMON

,-;< I
~t_’ II.}-(“::’ __-+____=-{ AN TENNA
_ ~uJ6

I :.–t—–, 4′ : r—
J _-+t_:iJu’

AN~ —

+-t’ L ____’---------------------------- --------- -----------------------------------_-..

“-~;t

~t:-“‘+O.K

K 1- –

RI07

+ C41C

‘”‘

NOTES

I. UNLESS OTHERWISE SPECIFIED.

ALL RESISTORS ARE IN OHMS ~ 10″1″, 1/2 WATT.

ALL CAPACITORS ARE IN UUF,{SEE PARTS LIST

4. ALL SECTIONS OF BAND SELECTOR SWITCH (SIl ARE MECHANICALLY GANGED.

4’ 1,0 17

POWER (J7) (AS VIEWED FROM

— …… …

‘”

VJO3X

…….._. … ___. ~ -1_Hr~.c

_”””~:-‘._q;=cB

ACCESSORY

---I-----!I------.-rf:;!.p~X

CONTROL 2.7 IW
].-.-.t~5:

ItOFO

–
.__ _

;~WER

J 155-000010

FOR TEMPER ATURE AND VOLTAGE RATINGS l 2. FT INDICATES FEEDTHRU WITH NO CAPACITANCES.
3 BAND SELECTOR SWITCH {S I) SHOWN IN 80M POSITION. OPERATION SWITCH (52) SHOWN IN”OFF” POSITION RIT SWITCH (53) SHOWN IN”OFF” POSITION. ANTENNA SWITCH (54) SHOWN IN “COMMON”POSITION, RELAYS (KI,K2) ARE SHOWN IN “RECEIVE” POSITION

_ II _8 _5_2
112 19 _6_3

R AR OF SR-160)

152 3

~4

5 52 ~~

g

u
+:”>e

~~ ~

01-;-

gX i~ = ~ r.q

J:

~

~

I

i

~

rn

to

JUMPER PLUG

2, _

u
” >

u
” >

.”.,.

.”..,.

+'”

~

” z ‘”

..J

” Z

:I:

0: >- u
~ :5 !::

x ‘” ,.

1M 0: “‘

PI

Figure 20. Schematic Diagram of Model SR,160 Transceiver.

Schematic Symbol

Description

CAPACITORS

C1,49
C2,89,10l
C3,90,102
C4,21,32,35, 38,62,64,82, 86 C5,43, 93, 105
C6,94,106
C7,95,103
C8A,B,C C9,10,13,14, 16,23,25,26, 28,44,50,60, 67,71,72,73, 84,88,98,99, 108,122,140 C11,65,77, 81,85 C12
C15,20,34, 36,57,68, 76,111 C17,120
C18,75
C19,40,55, 66,70,112, 113,115,123, 128 C22
C24,31,33, 58,61 C27,46
C29
C30
C37,54,59, 87,91,97, 114,138 C39 C41A,B,C
C42 C45
C47
C48,51
C52,78
C53 C56,74,92 C63,80,96, 109 C69 C79
C83
C100,107
C104
C110
C116,117
C118 C119
C121
C124

27 Illl F, 2%, 500V, Plastic Mica
150 Illl F, 2%, 500V, Plastic Mica
240 Illl F, 2%, 500V, Plastic Mica
0.002 Il F, 20%, 500V, Ceramic Disc
82 Illl F, 2%, 500V, Plastic Mica
33 Illl F, 2%, 500V, Plastic Mica
56 Illl F,2%, 500V, Plastic Mica
Variable, DRIVER TUNE 0.01 Il F, 20%, 500V,
Ceramic Disc
47 IlIlF, 5%, 500V, PlastiC Mica
8.2 Illl F, 5%, 500V, Plastic Mica
0.02 Il F, 20%, 500V, Ceramic Disc
430 Illl F, 2%, 500V, Plastic Mica
0.1 Il F, +80%, -20%, 100V, Ceramic Disc
0.001 Il F, 20%, 500V, Ceramic Disc
12 Illl F, 2%, 500V, Plastic Mica
470 Illl F, 5%, 500V, Plastic Mi ca
10 Illl F, 5%, 500V, Plastic Mica
4.7 Illl F, 10%, 500V, Plastic Mica
220 Illl F, 50/0, 500V, Plastic Mica
0.005 Il F, 20%, 500V, Ceramic Disc
10 Il F, 50V, Electrolytic 2 X 30 IlF, 300V; 300 IlF,
25V; Electrolytic 1 Illl F, 10%, Composition Variable, 8 to 50 Illl F
Trimmer 180 Illl F, 2%, 500V,
Plastic Mica Variable, 5 to 25 Illl F
Trimmer 22 Illl F, 2%, 500V,
Plastic Mica O.lIlF, 10%, 200V, Paper 0.22 Ii F, 10%, 200V, Paper 100 Illl F, 5%, 500V,
Plastic Mica 0.1 Il F, 50V, Plastic Mica 24 Illl F, 2%, 500V,
Plastic Mica 330 Illl F, 5%, 500V,
Plastic Mica 1000 Illl F, 2%, 500V,
Plastic Mica 470 IlIlF, 2%, 500V,
Plastic Mica Variable, 0.8 to 13 IlIlF,
Neutralizing Trimmer 0.001 Il F, 3000V,
Ceramic Disc Variable, FINAL TUNE 680 IlIlF, 5%, 500V,
Plastic Mica 510 Illl F, 2%, 500V,
Plastic Mica 18 IlIlF, 5%, 300V,
Plastic Mica

Hallicrafters Part Number
493-110270-331 493-110151-334
493-102~
047-100395
493-110820-333 493-110330-333 493-110560-333 048-000543 047-100354
493-210470-233 493-140820-231 047-100471
493-110431-334 047-001428 047-001671
493-110120-331 493-110471-234 493-110100-231 493-140470-131 493-110221-234 047-100442
045-000755 045-001115 047-200403-002 044-200437 493-110181-334 044-100473 493-110220-331 046-001294-04 046-001298-004 493-110101-234 047-001146 493-110240-331 493-110331-234 493-310102-334 493-110471-334 044-000520 047-100397 048-000541 493-310681-234 493-110511-334 493-110180-221

SERVICE REPAIR PARTS LIST MODEL SR-160

Schematic Symbol

Description

Hallicrafters Part Number

CAPACITORS (CONT)

C125,135, 136,139 C126
Cl27
C129
C130 C131,132
C133
C134 C137

0.001 IlF, GMV, Feed- Through
68 Illl F, 2%, 300V, Plastic Mica
Variable, 1 to 8 fJ.J.lF, Trimmer
47 IlIlF, 2%, 500V, NPO, Ceramic Tubular
Variable, FREQUENCY
510 Illl F, 2%, 300V, Plastic Mica
18 Illl F, 2%, 500V, N470, Ceramic Tubular
0.001 Il F, GMV, Stand-off lOll F, 150V, Electrolytic

047-001308 493-110680-323
044-000593 491-024470-022
048-000542 493-110511-324
491-004180-083
047-001634 045-100307

*RESISTORS

R1 R2 R3,75 R4 and R28
R5,15,26,37, 40,52,66,90, 105,106 R6,103,114 R7,96 R8,61 R9,11,19,20, 49,53,58,59, 60,78,84,85, 113 RIO R12,13, 42,46 R14 R16,21 R17,80 R18,38,50, 54,89 R22,62,97 R23, 71, 77 R24,25,81, 110,115 RZ7 R29 R30 R31,36,39, 56,65,109 R32,51,67, 68,70,116 R33 R34 R35,57,69 R41 R43,44 R45
R47 and R55
R48,63,94 R64 R72 R73,74,93 R76
R79,95 R82
R83 R86 R87 R88 R91 R92 R98
R99
R100

22 ohm 180 ohm 82K ohm Variable, 10K ohm,
20%, 1/2 watt, RF GAIN; 500K ohm, 30%, 1/8 watt, AF GAIN lOOK ohm

451-252220 451-252181 451-252823 025-002311
451-252104

10 ohm 56K ohm 270 ohm 47K ohm

451-252100 451-252563 451-252271 451-252473

22K ohm, 1 watt 10K ohm

451-302223 451-252103

2200 ohm 100 ohm 15K ohm 4700 ohm

451-252222 451-252101 451-252153 451-252472

180K ohm 3300 ohm 1000 ohm

451-252184 451-252332 451-252102

120K ohm 4.7 Megohm 1.5 Megohm 220K ohm

451-252124 451-252475 451-252155 451-252224

470K ohm

451-252474

330K ohm

451-252334

47 ohm, 1 walt

451-352470

2.2 Megohm

451-252225

820 ohm

451-252821

470 ohm

451-252471

Variable, 250 ohm, 20%,

025-002227

1/4 watt, Carrier Bal.

Variable, 10 Megohm, -20%, 025-002229

+40%, 1/8 watt, CARRIER

500K ohm, 30%, 1/8 watt,

MIC GAIN

22K ohm

451-252223

390 ohm, 1 watt

451-352391

680 ohm

451-252681

4700 ohm, 1 watt

451-352472

Variable, 50K ohm, 20%,

025-002228

1/4 watt, Meter Zero Adj.

33K ohm

451-252333

3500 ohm, 50/0, 10 watts,

024-001484

Wire Wound

470 ohm, 2 watts

451-652471

56K ohm, 1 watt

451-352563

3300 ohm, 5%

451-251332

6800 ohm, 5%

451-251682

47K ohm, 1 watt

451-352473

180K ohm, 5%

451-251184

Variable, 25K ohm, 30%,

025-002306

1/6 watt, DIAL CAL

Variable, 25K ohm, 30%,

025-002226

1/6 watt, RIT CONTROL

(Inc. S3)

2700 ohm

451-252272

Schematic Symhnl

Description

Hallicrafters Part Number

*RESISTORS (CONT)

R102 R107 R108 R111 R112

2200 ohm, 1 walt 2.7 ohm, 1 walt 1500 ohm 5600 ohm 27K ohm

451-352222 451-352027 451-252152 451-252562 451-252273

*All Resistors are Carbon Type, 10%, 1/2 walt unless otherwise stated.

COILS AND TRANSFORMERS

L1 L2,9
L3,10
L4,11,16, 17,19 L5 L6 L7 L8 L12,13 L!:! L15 L18 T1 T2
T3,4,7 T5 T6
T8

Coil, aO-Meter Antenna Coil, 40-Meter Antenna
and Driver Coil, 20-Meter Antenna
and Driver RF Choke, 1 MH

050-000976 050-001013
050-000974
053-000580

Coil, SO-Meter Mixer Coil, 40-Meter Mixer Coil, 20-Meter Mixer Coil, SO-Meter Driver Parasitic Choke Assembly RF Choke Coil, PI Output Coil, VFO Transformer, Mixer Plate Transformer, Filter Termination Transformer, 5200 KC IF Transformer, Audio Output Transformer, Carrier
Oscillator Plate Transformer, Heterodyne
Mixer Plate

050-001075 050-001074 050-001073 050-000975 053-000676 053-200426 050-001067 050-001011 050-001024 050-001023
050-001021 055-000508 050-001025
050-001022

ELECTRON TUBES, DIODES, AND CRYSTALS

VI V2,11,13 V3 V4,17 V5 V6 V7
V8,9 V10 V12 V14 V15,16 CR1 CRZ,3 CR4 CR5
CR6 CR7 Y1
Y2 Y3

Tube, Type 12AW6 Tube, Type 12BE6 Tube, Type 12BZ6 Tube, Type 6EA8 Tube, Type 12AX7A/ECC83 Tube, Type 6AQ5A Tube, Type 12AU6
(Not Supplied) Tube, Type 12AT7 Tube, Type 6AM8A Tube, Type OA2 Tube, Type 12BY7A Tube, Type 12DQ6B Diode, Type 1N295 Diode, Type 1N87 Diode, Type 1N191 Diode, Type V-I 00
Varicap Diode, Type 1N34A Diode, Type 1N3253 Crystal, 100 KC (Not
Supplied) Crystal, 5200 KC Crystal, 3400 KC

090-901319 090-900040 090-001538 090-901350 090-901230 090-901331 090-001544
090-900034 090-001539 090-900001 090-901192 090-001475 019-301980 019-002941 019-102018 048-000464
019-101918 019-002939-01 019-002712
019-003247 019-003219-001

SWITCHES

Sl SlB&C SID SlE S2 S3 S4

Rotary, BAND SELECTOR (Inc. AlA Only)
Wafer, Receiver RF Amplifier and Mixer
Wafer, Transmitter Driver
Wafer, Transmitter PI Output
Rotary, OPERATIONPOWER ON/OFF
Rotary, RIT ON-OFF Slide, SPST, Antenna
Common-Separate

060-002636 062-000210 062-000209 062-000208 060-002615
p/a R99
060-100440

CONNECTORS

J1,2

Connector, PHONES and

036-000350

Key Jack

J3

Connector, Accessory,

006-001096

6-Pin

Schematic Symbol
J4 J5,6 J7
FL1
M1 DS1 K1 K2

Description

Hallicrafters Part Number

CONNECTORS (CONT)

Connector, MIC, W/hardware Connector, Phonc Pin-Plug,
Antenna (2) Connector, Power, 12-Pin
Jones Type

010-101569 036-100041
010-002586

MISCELLANEOUS

Bracket, Capacitor

067-010104

Mounting (C110)

Bracket, Capacitor

067-010032

Mounting (C118)

Bracket, Dial Drive

067-011801

Bracket, High Voltage

067-010909

Shield Mounting

Bracket, Meter Mounting

067-010135

Bracket, Pilot Light

067-010893

Bracket, Potentiometer

067-011800

Mounting

Bracket, Terminal Board

067-010891

Mounting

Bracket, Tube Mounting

067-009814

(V15-16)

Cabinet

150-006629

Cable, Two-Conductor

087-007927

Shielded

Coupling, Insulated

029-200564

(C8 and C118)

Coupling, Insulated (Sl)

029-001061

Cover, High Voltage Shield 066-003715

Dial Pointer

082-000567

Dial Window

022-000696

Disc Drive Assembly

150-006930

(Inc. Dial Scale)

Disc, Pinch

028-000496

Disc, Pinch Drive

028-000497

Disc, Support

028-000498

Escutcheon

007-000877

Escutcheon Plate

007-000872

Filter, Crystal

049-000280

Foot, Mounting

016-201072

Front Panel

068-001451

Gear, Pinion

026-001087

Gear, Spur

026-001097

Gear, Spur (Fixed)

026-001096

Grommet, Rubber (K2)

016-100034

High Voltage Shield Assembly 150-005800

Insulator, Feed- Through (K1) 008-103697

Insulator, Feed-Through (VFO) 008-103722

Insulator, Stand-Off (L15)

008-106147

Knob, AF GAIN, MIC GAIN, 015-001773

RIT LO-HI

Knob, BAND SELECTOR,

015-001775

DRIVER TUNE, FINAL

TUNE, OPERATION

Knob, Bar Type, CARRIER 015-001740-001

RF GAIN, RIT OFF/ON

Knob, DIAL CAL

015-001755-02

Knob, FREQUENCY

015-001815-003

Medallion, Hallicrafters “h” 007-000850

Meter

082-000566

Pilot Lamp, 1815

039-000689

Plate, ChaSSiS, Left-Hand

063-006421

Plate, ChaSSiS, Right- Hand 063-006420

Plug, Six-Contact (Mates

035-000088

with J3)

RelayJ Control

021-000729

Relay, Antenna

021-000731

Ring, Retaining, Driver

076-000972

Tune Shaft

Ring, Retaining, Pinch

076-102136

Drive

Shaft, Band Selector

074-002891

Shaft, Dial Disc

074-002759

Shaft, Driver Tune

074-002873

Shaft, Final Tune

074-002882

Shaft, Pinch Drive

074-002758

Shaft, Tuning

074-002757

Shield, Final Tank

069-001785

Shield, High Voltage

069-001786

Shield, RF Driver

069-001874

Shield, RF Mixer

069-001873

Shield, RF Power Amplifier 069-001784

Shield, VFO Can

069-001586

Spring, Anti- Backlash

075-000841

Spring, Ground

075-000959

Spring, Pinch Drive

075-000902

Terminal Board

008-008068

FINAL (12DQ6B) TUBE MATCHING.
If either or both 12DQ6B tubes/ are replaced, tube matching will be required. This may require access to a nUmber of tubes in order to select those with the desired characteristics. Matched pairs of tubes are available through Hallicrafters’ Service Department for customer convenience.
The procedure for tube matching is as follows:
CAUTION
It will be necessary to come into contact with circuits which normally have high voltage applied to them. Use extreme care while performing the following operations.
1. Set the OPERATION switch to OFF.
2. Remove the chassis unit from the cabinet as described in paragraph 7-1.
3. Remove the top cover from the final amplifier cage.
4. Remove one 12DQ6B tube. If both tubes are defective, both tubes should be removed and one new tube installed. The unused plate cap must not touch nearby components.
5. Connect a voltmeter or milliammeter to the power supply tip jacks as described in BIAS ADJUSTMENT, paragraph 8-3.
6. Set the OPERATION switch at REC. ONLY and allow approximately two minutes warmup.
7. Set the CARRIER control fully CCW.
8. Set the OPERATION switch at CW-TUNE.
9. Adjust the BIAS ADJ control for a 0.3-volt (30 MA) reading on the voltmeter.
10. Return the OPERATION switch to OFF.
11. Short the 12DQ6B plate cap to the chassis and remove the tube from its socket.
12. Insert a new 12DQ6B tube into the same socket and connect the plate cap.
13. Place the OPERATION switch in REC. ONLY and allow approximately two minutes for warmup.
14. Place the OPERATION switch at CW-TUNE and observe the voltmeter reading. (Do not change the bias setting.)
15. If this tube causes the voltmeter to read between 0.2 volt (20 MA) and 0.4 volt (40 MA), it can be considered as being matched to the original tube. If the difference in reading exceeds 0.1 volt (10 MA), other tubes must be checked until the difference reading of the pair to be matched is less than 0.1 volt (10 MA).
16. Install the matched pair of tubes and set the bias as described in BIAS ADJUSTMENT, paragraph 8-3.
17. The final amplifier may require neutralization after the new tubes are installed. Refer to paragraph 8-7 for the neutralization check and adjustment procedure.

Printed in U.S.A.

094. 903566 1263

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