Drake TR-4C User Guide

TABLE OF CONTENTS

CHAPTER I INTRODUCTION .......................

Page

l-l
l-l.
l-2.

CHAPTER II

2-1.
2-2.
2-3.
2-4.
2-5.
2-6.
2-7.
2-8.
2-9.
2-10.

GENERAL DESCRIPTION
MANUAL COVERAGE

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . .

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INSTALLATION. .......................

UNPACKING

LOCATION
MOBILE INSTALLATION
POWER REQUIREMENTS
MOUNTING
ANTENNA.
SPEAKER
MICROPHONE
STATIONARY INSTALLATION
POWER REQUIREMENTS

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l-l
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l-3

2-l
2-l
2-l
2-l

2-l
2-l

2-l

2-l
2-l
2-2

2-2
2-11.
2-12.

CHAPTER III

3-l. GENERAL. ..........................

3-2.
3-3.
3-4.
3-5.
3-6.

3-7.
3-8.

VIEWING ANGLE
ACCESSORIES

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OPERATION .........................

MODE SWITCH
BLANKER SWITCH
VFODIAL.
TUNING PROCEDURE
BIAS ADJUSTMENT
FRONT PANEL CONTROLS
OTHER CONTROLS
TUNE UP
SSB OPERATION

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2-2

2-2

3-l

3-l

3-l

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3-l

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3-3

3-4

3-5

3-5

i

3-9.

CW OPERATION.

TABLE OF CONTENTS (continued)

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Page

3-6
3-10.
3-11.
3-12.
3-13.

CHAPTER IV

4-l.
4-2.
4-3.

CHAPTER V

5-l.
5-2.
5-3.
5-4.

5-5.

AM OPERATION .........................

OPERATION NEAR BAND EDGES-..................

OPERATION WITH A LINEAR AMPLIFIER ...............

NOVICE OPERATION. ......................

THEORY OF OPERATION. ...................

GENERAL. ..........................

RECEIVER CIRCUITRY......................

TRANSMITTER CIRCUITRY ....................

MAINTENANCE. . . .

SERVICE DATA. . . . .

TOP COVER REMOVAL . .

BOTTOM COVER REMOVAL
TUBE REPLACEMENT . .
TROUBLE SHOOTING . .

3-6

3-6

3-6

3-7

4-l

4-l

4-l

4-2

5-1

5-l
5-l
5-l
5-l
5-l

5-6.
5-7.
5-8.
5-9.
5-10.
5-11.
5-12.
5-13.
5-14.
5-15.

5-16.
5-17.
5-18.
5-19.

TEST EQUIPMENT. . . .

ALIGNMENT PROCEDURES
CRYSTAL CALIBRATOR .

9.0 MHz OSCILLATOR . .
INJECTION CRYSTAL OSCILLATOR
VFO ADJUSTMENT
INJECTION COUPLER
RECEIVER IF
BALANCED MODULATOR AND CARRIER BALANCE

FILTER MATCHING TRANSFORMER
MIXER AND IF ALIGNMENT
PA NEUTRALIZATION
TRANSMITTER NEUTRALIZATION.

S METER ADJUSTMENT.

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5-2
5-2
5-2
5-2
5-2
5-2
5-2
5-5

5-5
5-6
5-6
5-6
5-6
5-6

ii

LIST OF ILLUSTRATlONS

Figure

l-l.

2-l.

2-2.

2-3.

2-4.

2-5.

2-6.

2-7.

2-8.

2-9.

3-l.

4-l.

5-1.

TR-4C SIDEBAND TRANSCEIVER

MICROPHONE CONNECTIONS

REAR CHASSIS CONNECTORS

ELECTRICAL CONNECTIONS REQUIRED FOR MOBILE INSTALLATION

MOBILE INSTALLATION MOUNTING OPTIONS

VIEWING ANGLE OPTIONS IN A STATIONARY INSTALLATION

CONNECTING THE AC-4 POWER SUPPLY AND MS-4 SPEAKER

CONNECTING THE AC-4 POWER SUPPLY, RV-4C REMOTE VFO AND

A LINEAR AMPLIFIER

CONNECTING THE AC-4 POWER SUPPLY AND THE L-4B LINEAR AMPLIFIER

CONNECTING AN EXTERNAL RECEIVER

FRONT PANEL CONTROLS

BLOCK DIAGRAM
ALIGNMENT LOCATIONS, TOP VIEW

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2-l

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2-2

2-3
2-4

2-5

2-5

2-6

2-6

2-7

3-2
4-4

5-8

5-2.

5-3.

5-4.

5-5.

ALIGNMENT LOCATIONS, BOTTOM VIEW
AC-4 POWER SUPPLY SCHEMATIC.

DC-4 POWER SUPPLY SCHEMATIC.

TR-4C SCHEMATIC

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5-9
5-11

5-11

5-l 1

. . .

III

CHAPTER I

INTRODUCTION

l-l. GENERAL DESCRIPTION.

The TR-4C is a 300 Watt HF single sideband trans­ceiver which covers the 80 through 10 meter
amateur bands. AM and CW modes are also included.
The TR--4C requires either an R. L. Drake AC-4,

120 V AC power supply, or an R. L. Drake DC-4,

12 V DC power supply. The TR-4C features a
high-stability linear permeability tuned VFO and
two 8 pole crystal lattice filters for sideband selec­tion. Available accessories include an RV-4C

Remote VFO, a matching MS-4 Speaker, an FF-1
Fixed Frequency Adapter, a 34-PNB Noise Blanker,

an MC-4 Mobile Console, and a TR-4C VHF
Modification Kit.

1-2. MANUAL COVERAGE.

This manual provides sufficient information for
operation of the TR-4C Transceiver by a licensed
operator and for repair and maintenance by an ex­perienced electronics technician. Chapter II provides
installation instructions and illustrates interconnec­tion with accessories. Chapter III describes operation
procedures. Chapter IV presents theory of operation
supported by a block diagram. Chapter V provides
maintenance instructions and parts ordering infor­mation.

l-l

GENERAL:

SPECIFICATIONS

FrequencyCoverage

:

3.5 to 4.1 MHz, 7.0 to7.6MHz, 13.9to 14.5 MHz, 21.O to 21.6 MHz
and 28.5 to 29.1 MHz; accessory crystals are available for the 28.0
to 28.6 MHz and 29.1to29.7 MHzsegments of the10 meter band.

Mode of Operation: Lower Sideband, Upper Sideband, AM and CW.
Frequency Stability:

Total drift is less than 100 Hz after warm up. Total frequency change
is less than 100 Hz for a

+-

10% line voltage change.

Power Supply
Requirements:

+ 650 Volts DC at 300 mA average and 500 mA maximum with 10%
regulation from 100 to 500 mA and a maximum ripple 1%.

+ 250 Volts DC at 200 mA with 10% regulation from 170 mA to

200 mA. This includes the effect of the 650 Volt supply change if

both voltages are obtained from the same transformer. Maximum
ripple must be less than

l/4%.

-45 to -65 Volts DC adjustable filtered bias into 33 K Ohm load.

12.6 Volts AC or DC at 5.5 Amperes.

Antenna Impedance:
Dial Calibration:

Nominal 52 Ohms (VSWR less than 2: 1).

Better than +- 1 kHz when calibrated at the nearest 100 kHz calibra-

tion point.

Dimensions:

5.5 in. High x10.75 in.Wide x 14.375in.Deep.

27.31 cm. Widex 36.51cm. Deep.

13.97

cm.

High

x

Weight:

RECEIVER:
Sensitivity:

AGC:

Selectivity:
IF Frequency:
Audio Output:
Output Impedance:
TRANSMITTER:
Power Input:
Output Impedance:
Average Distortion

Products:
Microphone Input:

16 lbs. (7.26 kg.)

S+N

Less than 0.5

micro

V for 10

dB

N

Less than 3 dB variation for 60 dB change in input signal.

2.1

kHzzat-6

dBB

and3.4kHzzat-60

dB.
9 MHz.
3 Watts with less than 10% distortion.
4 Ohms.

300 Watts PEP SSB, 260 Watts CW and 260 Watts PEP AM.
Nominal 52 Ohms.

The odd order products are down 30

dB

below PEP.

High Impedance.

l-3

CHAPTER II

INSTALLATION

2-1. UNPACKING.

Carefully remove the unit from the shipping carton
and examine it for evidence of damage. If any
damage is discovered, immediately notify the trans­portation company that delivered the unit. Be sure
to keep the shipping carton and packing material as
the transportation company will want to examine
them if there is a damage claim. Keep the carton
and packing material even if no shipping damage
occurs. Having the original carton available makes
packing the unit much easier if it should ever be
necessary to store it or return it to the factory for
service.

NOTE

Fill out the enclosed registration card
and return it to the factory immediately
to insure registration and validation of
the warranty.

2-2.

LOCATION.

The location of the TR-4C is not critical. However,
care should be taken to insure that adequate clear­ance is provided to insure free circulation of air
around the unit and to allow access to the side
controls and connectors. Do not cover the top of
the cabinet with books, papers or other equipment
as overheating may result.

2-3.

MOBILE INSTALLATION.

Model MMK-3 Mobile Mounting Kit. Refer to
figure 2-4 for various mounting options. Be sure
to allow adequate clearance for air circulation and
cable connections. Turn the TR-4C off. Connect
the power cable between the TR-4C and the DC-4.
Coil up any excess cable and tape it in place out of
sight. Connect the black wire from the power supply
to a convenient ground. Route the red wire from the
power supply through the firewall and connect it to
the positive battery terminal or the starter solenoid.
The fuse holder should be installed as close to the
solenoid as possible. Shorten both of these wires as
much as possible.

2-6. ANTENNA. Install a mobile antenna as rec­ommended by the antenna manufacturer. Connect
a coaxial cable from the antenna to the SO-239
connector at the rear of the TR-4C.

2-7. SPEAKER. DO NOT connect the TR-4C to

the speaker of the car radio. Install a separate

speaker for use with the TR-4C. The R. L. Drake

Model MC-4 Mobile Console is recommended for

this type of installation. It includes a speaker and a

wattmeter and is designed to mount over or under

the TR-4C.

2-8. MICROPHONE. Use a microphone with a flat

frequency response. The microphone should have a

cardioid pattern to reduce pickup from the back

and sides. Connect the microphone as illustrated in

figure 2-l to insure proper performance.

2-4.

POWER REQUIREMENTS. Refer to figure

2-2 for rear chassis connector identification. The

TR-4C

may be installed in any vehicle with a 12
volt dc negative ground system. An R. L. Drake
Model DC-4 Power Supply is required for a mobile
installation. The recommended location for the

DC-4 is on the passenger side of the firewall. Refer
to figure 2-3 for the electrical connections required.

2-5. MOUNTING. Mount the TR-4C in a con-

venient location below the dash with an R. L. Drake

L-_________~

MICROPHONE

Figure

2- 1.

S-230 CONNECTOR

Microphone Connections

2-l

2-9. STATIONARY INSTALLATION.

2-10. POWER REQUIREMENTS. An R. L. Drake

Model AC-4 Power Supply rated at 120 volts ac,

50/60 Hz, is required for stationary installations.
The AC-4 is designed to fit inside the MS-4
speaker cabinet.

NOTE
If the old RV-3 is to be used it must
be modified as follows: Install a 22 K,
2 Watt resistor from pin 1 of the tube
(OA2) to the terminal of the FUNCTION
switch to which the orange wire is
attached.

2-l 1. VIEWING ANGLE. Refer to figure 2-5 for
illustrations of viewing angle options. See Chapter V
for bottom cover removal.

2-l 2. ACCESSORIES. Refer to figures 2-6 through
2-9 for the electrical connections required to
operate the TR-4C with the various recommended

accessories.

2-2

GROUND

Figure 2-2.

ANTENNA

POWER

Rear Chassis Connectors

EXTERNAL EXTERNAL
RECEIVER RECEIVER

ANTENNA

MUTE