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Drake TR-4 Transceiver
Single Sideband Transceiver
The R. L. Drake model TR-4 is a single sideband Transceiver designed for the transmission and reception of upper and lower sideband signals on the 80 through 10 meter amateur bands. AM and CW capabilities are included. Its compact size makes it ideal for both fixed station use in conjunction with our model AC-3 120 volt AC Power Supply, or for mobile installations using our model DC-3 12 volt DC Power Supply. The 300 watt P.E.P. input on SSB enables the TR-4 to give an excellent account of itself "barefoot" and it will drive the highest powered ham linear amplifiers. Upper and lower sideband selection is accomplished by switching between two 9 me crystal lattice filters with 2.1 KC passbands. Among the other features included on the TR-4 are VOX and PTT on SSB and AM, diode detection for AM, shifted carrier CW, automatic transmit receive switching on CW, built in CW sidetone, separate RF and AF gain controls, solid state VFO with linear permeability tuning, transmitting and receiving AGC indicator and plate ammeter/RF output indicator, adjustable pi-network output, and built in crystal calibrator. The addition of the accessory RV-4 remote VFO speaker combination enables the operator to receive, transmit, or transceive throughout the band being used without distrubing the setting of the TR-4 tuning dial. This is useful for working DX stations operating outside the United States Phone bands, or for working near your own frequency in search of a clear spot under crowded band conditions.

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Service and User Manual
Manual type:
Service and User Manual
14.95 Mbytes (15676005 Bytes)
Scanned document, reading partly badly, partly not readable.
Upload date:
16 December 2018
General Specifications 3 Transmitter Specifications 4 Receiver Specifications 5 Power Supply Requirements 5 Tube Complement 5 I General Description 6 II Installation Instructions 7 A. Unpacking 7 B. Antenna Requirements 7 C. Speaker Requirements 7 D. Microphone Requirements 7 E. Location 8 F. Fixed Installation 8 G. Mobile Installation 8 III Control Functions 14 A. Front Panel Controls 14 B. Side Controls and Jacks 16 C. Rear Controls and Jacks 16 D. Other 17 IV Tuning Procedure 18 A. Bias Adjustment 18 B. Adjusting Dial Calibration 18 C. Tune-up on the Desired Band 18 D. Adjustment of Carrier Balance Control 19 V Operation 21 A. Voice Controlled Operation on SSB 21 B. Push to Talk Operation on SSB 21 C. CW Operation 22 D. AM Operation 22 E. General Precautions for Operation Near Band Edge 23 F. Operation with Linear Amplifiers 23 VI Theory of Operation 25 A. Receiver Circuitry 25 B. Transmitter Circuitry 26 VII Service Data 29 A. Removing Top Cover . 29 B. Removing Bottom Cover 29 C. Tube Replacement 29 D. Troubleshooting 29 VIII Alignment Instructions 34 A. Crystal Calibrator Alignment 34 B. Adjustment of 9.0 Me Oscillator 34 C. Crystal Oscillator Alignment 34 D. VFO Adjustment 35 E. Adjustment of Injection Couplers 35 F. Receiving I.F. Alignment 35 G. Adjustment of Bal. Modulator 35 H. Filter Matching Transformer 36 I. Carrier Balance Adjustments 36 J. Adjustment of Mixer and RF Coils 36 K. Final Amplifier Neutralizing 37 L. Transmitter I. F. Neutralizing 37 IX AC-3 Power Supply Instructions 38 X DC-3 Power Supply Instructions 39 XI RV-3 Remote VFO Instructions 41 CHARTS AND ILLUSTRATIONS Fig. # 1 Connecting the TR-4 to the AC-3 and MS-4 10 Fig. # 2 Connecting the TR-4 to a linear amplifier 10 Fig. #3 Using the TR-4 with an external receiver 11 Fig. # 4 Electrical connection for mobile installation of TR-4 11 Fig. # 5 Mechanical details for mobile installation 12 Fig. #6 Viewing Angle Options 13 Fig. # 7 Rear View 17 Fig. # 8 Side View 20 Fig. # 9 Attenuation for using TR-4 with Linear Amplifier 24 Fig. #10 Block Diagram 28 Fig. #11 Resistance Chart 30 Fig. #12 Voltage Chart 31 Fig. #13 Top View 32 Fig. #14 Bottom View 33 Fig. #15 Selectivity Curves ' 37 Fig. #16 AC-3 Schematic Diagram 38 Fig. #17 DC-3 Schematic Diagram 40 Fig. #18 RV-3 Schematic Diagram 44 Fig. #19 TR-4 Schematic Diagram 45

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