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GENERAL DESCRIPTION
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 mc crystal lattice filters with
2.l 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 disturbing 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. The accessory FF-1 is a fixed frequency adapter useful
wherever crystal controlled operation is desired. It provides two switch
selected channels and allows off , crystal controlled transmit only or
transceive operation.
GENERAL SPECIFICATIONS
 | FREQUENCY COVERAGE: Full coverage
on all amateur bands 10 thru 80 meters, in seven 600 kc ranges: 3.5 to
4.1 mc, 7.0 to 7.6 mc, 13.9 to 14.5 mc, 21 to 21.6 mc, 28 to 28.6 mc,
28.5 to 29.1 mc, 29.1 to 29.7 mc. |
| SOLID STATE VFO: Has linear
permeability tuning. Tunes 4.9 to 5.5 mc for all ranges. |
| DIAL CALIBRATION: 10 kc divisions on
main tuning dial and 1 kc on tuning knob skirt. Effective length of
circular dial scale is over 14 inches. |
| FREQUENCY STABILITY: High
stability solid state VFO tunes same range on all bands. Overall drift
is less than 100 cycles after warm-up, and less than 100 cycles for
plus or minus 10% line voltage change. |
| MODES OF OPERATION: SSB (Upper or
Lower Sideband), CW, and AM. |
| FRONT PANEL CONTROLS:
 | Main Tuning has fluted knob
with adjustable 25 division skirt. Tunes VFO and rotates main
dial. |
| RF Tune tunes the RF circuits
common to receiver RF amplifier and transmitter driver stages.
0-10 scale. |
| Plate and Load tuning
adjust pi-network capacitors in transmitter for proper resonance
and loading on each band. |
| Band switch selects desired
ham band (see frequency coverage). |
| Function switch has four
positions; CAL, SSB, X-CW, X-AM. CAL operates built-in 100 kc
crystal calibrator for accurate setting of main tuning hair line
indicator and knob skirt. SSB provides SSB operation, either VOX
or PTT. X-CW provides for CW operation with automatic transmit
receive switching and CW sidetone, and is used for tune up. X-AM
provides controlled carrier AM operation with VOX or PTT, and with
diode detector for receiving. |
| XMTR GAIN functions as mike
audio gain on SSB and AM, and as carrier injection control on CW. |
| RCVR GAIN knob controls
receiver AF gain and power ON-OFF switch. Lever behind knob
controls setting of RF gain. |
| SIDEBAND switch in
conjunction with indicator lights marked Upper and Lower selects
desired sideband by connecting into the circuit either the upper
or lower sideband filter. (X position used when in X-CW or X-AM
positions of Function Switch.) |
| OUTPUT METER CONTROL switch
converts plate meter to read relative OutPut, when pushed.
Rotating varies output meter sensitivity. |
|
| RIGHT SIDE SCREWDRIVER ADJUST
CONTROLS:
| VOX Gain |
| Anti VOX Gain |
| S-Meter Zero |
|
| RIGHT SIDE JACKS:
| Headphone (disconnects speaker
circuit) |
| Microphone (3-circuit for PTT) |
| Key (normally closed) . |
|
| REAR CONTROLS:
| Sidetone (adjusts sidetone volume) |
| Lights (for dimming dial lights). |
|
| REAR JACKS:
| Power (connects TR-4 to power supply
and speaker) |
| RCVR MUTE (for muting an external
receiver) |
| RCVR ANT (Uses TR-4 ant. relay to
connect an external receiver to the antenna) |
| Antenna (for connecting the TR-4 to
the antenna). |
|
| LEFT SIDE CONTROLS:
| TCVR/RCVR switch (for selecting
between the use of the TR-4 or an external receiver for
receiving). |
|
| INSIDE CONTROLS:
| Carrier balance . |
|
| METERS:
| Receiver S-Meter/transmitting AGC
indicator |
| Transmitter Plate Ammeter/relative
R. F. output indicator. |
|
| MISC: 20 tubes including voltage
regulator; two transistors; nine diodes; 100 kc crystal calibrator
built in;
| Dimensions: 5 1/2 high, 10 3/4 wide,
14 3/8 deep. |
| Weight: 16 lbs. |
|
TRANSMITTER SPECIFICATIONS
| SINGLE SIDEBAND: 300 watts P.E.P
input power, VOX or PTT. Two special 9 mc crystal filters provide
upper or lower sideband selection on any band, without the necessity
of shifting oscillators . Unwanted sideband suppression of more than
60 db and carrier suppression of 50 db, Overall audio frequency
response 400 to 2500 cycles at 6 db down, Distortion products 30 db
down at maximum output. |
| CW: Power input 260 watts,,
Carrier is shifted approximately 1000 cycles into one sideband, and
mixer and driver are keyed. Grid block keying is free from chirps and
is properly shaped to minimize clicks. Automatic transmit/receive
switching when key is operated. CW sidetone oscillator for
monitoring. |
| AM: Controlled carrier AM screen
modulator is built-in, 260 watts P.E.P. input. Low carrier power
increases 6 times to 50 watts output at maximum modulation, This
system is compatible with SSB linears. VOX or PTT, Diode detector used
for receiving on this mode. Product Detector can be used by switching
manually. |
| OUTPUT IMPEDANCE: Nominal 50
ohms, adjustable with pi-network. |
| MICROPHONE INPUT: High-impedance
. |
RECEIVER SPECIFICATIONS
| SENSITIVITY: Less than 1/ 2
microvolt for 10 db S/N. |
| I.F. SELECTIVITY: 2.1 kc at 6 db,
3,6 kc at 60 db. |
| AGC: FULL AGC on received mode
audio output varies less than 3 db for 60 db change in signal level
.Any amount of AGC from zero to full can be had by adjustment of RF
gain control. Time proven Drake AGC system provides fast attack and
slow release with noise pulse suppression. No pumping or popping
evident. |
| ANTENNA INPUT: Nominal 50 ohms. |
| AUDIO RESPONSE: 400-2500 cycles
at 6 db. |
| AUDIO OUTPUT POWER: 2 watts. |
| AUDIO OUTPUT IMPEDANCE: 4 ohms. |
| POWER SUPPLY REQUIREMENTS
Due to the 300 watt P.E.P. input rating, the TR-4 will require a power
supply capable of low voltage at high current with very good dynamic
regulation. The voltage and current requirements are as follows:
| 650 volts at 300 ma average and 500
ma maximum with 10% regulation from 100 ma to 500 ma and maximum
ripple of less than 1%. |
| 250 volts at 175 ma with 10%
regulation from 150 ma to 180 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 1/4 %. |
| -45 to -65 VDC adjustable filtered
bias into 33 KOhm load. |
| 12.6 Volt AC or DC at 5.5 amps. |
|
| TUBE: 20 tubes including
voltage regulator, four transistors; nine diodes |
TUBE
Complement |
Transmitter |
Receiver |
| 12AX7 |
Mike Amp. |
----- |
| 6EV7 |
VOX Amp.
/Relay |
----- |
| 6GX6 |
9 MC Xtal
Osc. |
BFO/Prod
. Det |
| 12BA6 |
I.F. Amp. |
----- |
| 12BA6 |
----- |
I.F. Amp. |
| 6BZ6 |
----- |
I.F. Amp. |
| 12AX7A |
AGC |
AGC |
| 6AQ5A |
Anti-VOX |
Audio
Output |
| 6HS6 |
Mixer |
----- |
| 6EA8 |
Cathode
Fo 1 |
Mixer/Cath
. Fol. |
| 6EA8 |
Pre-Mixer/Xtal
Osc. |
Pre-Mixer/Xtal
Osc. |
| 13DE7 |
AM Screen
Mod. |
----- |
| 12BA6 |
----- |
R.F. Amp. |
| 6BA6 |
----- |
Crystal
Calib. |
| 12BY7 |
Driver |
----- |
| 3 x 6JB6 |
Power
Amps |
----- |
| 0A2 |
Voltage
Reg. |
Voltage
Reg. |
| TIS94 |
VFO |
VFO |
| 2N3858 |
VFO
Buffer |
VFO
Buffer |
| 2N3394 |
VFO Shut
Off |
VFO Shut
Off |
| 2N3877 |
Neon
Driver |
Neon
Driver |
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