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GENERAL :
The R. L. Drake model TR-3 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 PEP input on SSB enables the TR-3 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 Drake designed and manufactured 9 MC crystal lattice filters with 2.1 kc pass-bands. Among the other features included on the TR-3 are VOX and PTT, shifted carrier
CW, separate RF and AF gain controls, linear permeability tuned VFO with vernier scale, transmitting and receiving
AGC, and separate receiver S-meter and transmitter plate ammeter. The addition of the accessory RV- 3 remote VFO speaker combination enables the operator to receive, transmit or transceive throughout the
band being used without disturbing the setting of the TR-3 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.
SPECIFICATIONS
GENERAL
 | FREQUENCY COVERAGE: Full coverage on all amateur bands 10 thru 80 meters,
in seven 600 k c ranges ; 3.5-4.1 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. |
| LINEAR PERMEABILITY TUNED VFO: Tunes 4.9 to 5.5 mc for all ranges, 9 mc I.F. minus VFO range overs 80 meters, 9 mc I. F. plus VFO range covers 20 meters. VFO and crystal oscillator heterodyned in premixer for 40, 15, and three 10 meter ranges. |
| DIAL CALIBRATION: 10 kc divisions on main tuning dial and interpolation to 1 kc on tuning knob skirt . Effective length of circular dial scale is over 14 inches. |
| FREQUENCY STABILITY: High stability permeability tuned VFO tunes same range on all bands . 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 and 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 circuit 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, and is receive position for SSB, CW, and AM. X-CW (transmit CW) inserts carrier , converts ‘Xmtr Gain’ control to carrier injection for tuning and CW transmitting. X-AM (transmit AM) inserts carrier and screen modulator for AM transmitting. |
| XMTR GAIN functions as mike audio gain on SSB and AM, and as carrier injection control on X-CW for tune and 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. |
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| RIGHT SIDE SCREWDRIVER ADJUST
CONTROLS:
| VOX Gain, |
| Anti-Vox Gain, |
| S-Meter Zero. |
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| INSIDE SCREWDRIVER ADJUST CONTROLS:
| Carrier Balance. |
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| RIGHT SIDE JACKS:
| Headphone (disconnects speaker circuit), |
| Microphone (3-circuit for PTT). |
| Key (normally closed). |
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| REAR CONTROLS:
| LIGHTS switch brightens and dims pilot lights. |
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| METERS: Separate receiver
| S-meter/transmitting AGC indicator |
| Transmitter plate meter. |
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| MISC: 20 tubes including voltage regulator: 6 diodes :
100 kc crystal calibrator built-in. |
| Dimensions: 5-1/2" high, 10-3/4" wide, cabinet depth 1.4-l/2" overall depth including knobs 14-3/4". |
| Weight:15 Ibs 14 OZ. |
TRANSMITTER SPECIFICATIONS:
| SINGLE SIDEBAND: 300 watts P.E.P. input power. VOX or PTT. Two special 9 mc crystal filters provide sideband selection, upper or lower on any band, without the necessity of shifting oscillators . The 9 mc filters are asymmetrical, that is, steeper on the carrier side (see filter selectivity charts) making possible unwanted sideband suppression of more than 40 db above 750 cycles and carrier suppression of 50 db. Overall audio frequency response 400 to 2500 cycles at 6 db down. Distortion products 35 db down at maximum output. |
| CW: Power input 260 watts. Carrier is shiftited approx. 1000 cycles into one sideband and mixer is keyed. Grid block
keying is free from chirps and clicks. Manual transmit/receive switching.
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. Manual transmit/receive switching. |
| 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, 7.5 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. |
| AM: Product detector reception of AM (known as exalted carrier method) requires zero beating signal . Advantages over diode detectors include no selective fading, choice of either sideband, and better audio frequency response at 2.1 KC selectivity,
resulting in more QRM fre e QSO’s. |
| 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-3 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 174 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. |
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| TUBE |
TUBE
Complement |
Transmitter |
Receiver |
| 12AX7A |
Mike Amp. |
----- |
| 6EV7 |
VOX Amp. /Relay |
----- |
| 6GX6 |
9 MC Xtal Osc. |
BFO/Prod . Det |
| 12BA6 |
I.F. Amp. |
----- |
| 12BA6 |
----- |
I.F. Amp. |
| 12BA6 |
----- |
I.F. Amp. |
| 12AX7A |
AGC |
AGC |
| 6AQ5A |
Anti-VOX |
Audio Output |
| 6HS6 |
Mixer |
----- |
| 6EA8 |
Cathode Fol. |
Mixer/Cath . Fol. |
| 6EA8 |
Pre-Mixer/Xtal Osc. |
Pre-Mixer/Xtal Osc. |
| 6AU6A |
VFO |
VFO |
| 13DE7 |
AM Screen Mod. |
----- |
| 12BA6 |
----- |
R.F. Amp. |
| 12BA6 |
----- |
Crystal Calib. |
| 12BY7A |
Driver |
----- |
| 3 x 12JB6 |
Power Amps |
----- |
| 0A2 |
Voltage Reg. |
Voltage Reg. |
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ACCESSORIES for TR-3
| MMK-3 Mobile Mounting Kit |
| MS-3 Matching Speaker
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| RV-3 Remote VF0 for TR-3: Remote
VFO’s permit rcvg, xmtg or xcvg on separate frequency in same band as xcvr |
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