Collins KWM-1 
Tube List: 6AH6 (1), 6AL5 (3), 6AQ5 (1), 6AU6 (2), 6BA6 (3), 6BA7 (3), 6CL6 (1), 6DC6 (2), 6U8 (2), 12AT7 (2), 12AU7 (2), 6146 (2). Description: The Collins KWM-1 is the first amateur band transceiver designed for mobile and fixed station applications. Final amplifier plate input power is 175 watts PEP on SSB or 160 watts on CW. A crystal plug-in unit allows for the selection of ten crystal positions, each covering a 100 kc segment in the frequency range of 14 to 30 Mc. The Pi-L output network with roller-inductor provides for efficient and continuous tuning throughout the entire frequency range of operation. The transceiver utilizes VOX circuits for voice and modified break-in CW operation. Most of the tuned circuits and several tubes function in the dual role of transmitting and receiving. A front panel meter functions as the receiver's S-meter as well as an indicator for transmitter output tuning. Easily accessible controls on the front panel of the KWM-1 include the EMISSION SWITCH, EXCITER TUNE, ZERO SET, PA TUNE, PA LOAD, MIC GAIN, VOX GAIN, ANTI-TRIP, Band Switch (crystal selector), AF GAIN, RF GAIN, METER SWITCH, Main Tuning (PTO), DIAL Dimmer Control (after first models).Specifications: FREQUENCY RANGE: Any 100 kc range from 14 to 30 Mc using the appropriate crystal. Ten crystal positions with the following crystals are supplied: 14.0 - 14.1 Mc 14.2 - 14.3 Mc 14.9 - 15.0 Mc (WWV) 21.0 - 21.1 Mc 21.3 - 21.4 Mc 21.4 - 21.5 Mc 28.0 - 28.1 Mc 28.1 - 28.2 Mc 28.5 - 28.6 Mc 28.6 - 28.7 Mc FREQUENCY CONTROL: 70K-1 Permeability Tuned Oscillator (PTO) MODES: SSB (either sideband selectable), CW. TYPE OF SERVICE: SSB continuous; CW 50% duty cycle. POWER REQUIREMENTS: Power can be delivered by an external supply such as the 516F-1 or 516E-1 which must furnish 800 vdc at 200 ma; 265 v dc at 210 ma; 6.3 v at 11 amps, and from -50 to -80 vdc at 3 ma. Heater supply may also be 12.6 v at 5.5 amps. Reduced final plate voltage and current typical of mobile installations will reduce power output specifications. PLATE INPUT POWER: 175 watts PEP on SSB; 160 watts on CW. OUTPUT POWER (Approximate into 50 ohms): 90 watts PEP (14 - 25 Mc); 80 watts PEP (25 - 30 Mc). HARMONIC AND OTHER SPURIOUS RADIATION: Carrier suppression -50 db; unwanted sideband -50 db; oscillator feed-through and/or mixer products -50 db. Second harmonic -40 db. Third order distortion -30 db. NOISE LEVEL: 40 db below single tone carrier. CALIBRATOR: 100 kc crystal oscillator. FREQUENCY STABILITY: Within 100 cps during any one-hour period following 20 minute warm-up. CALIBRATION ACCURACY: I kc after midband calibration. OUTPUT IMPEDANCE: 52 ohms nominal, Pi-L network is capable of matching up to 2.5:1 VSWR. KEYING CHARACTERISTICS: Keying is free of chirps and clicks. Break-in CW and side tone provided. AUDIO INPUT: High impedance microphone. AUDIO FREQUENCY RESPONSE: 300 - 3000 cps nominal, determined by Mechanical Filter. AUDIO COMPRESSION CHARACTERISTICS: Self-adjusting, dual time constant ALC increases the average talk power. RF FEEDBACK: RF feedback around PA and driver is provided for improved linearity. RECEIVER SENSITIVITY: 1.0 uv for 6 db signal-to-noise ratio at 3 kc bandwidth. RECEIVER SELECTIVITY: 3.0 kc nominal bandwidth at 6 db down as determined by Mechanical Filter. RECEIVER OUTPUT LEVEL: 1.0 watt maximum. PROTECTIVE DEVICES: PA cage is interlocked. SIZE: 14" W, 6 1/4" H, 10" D. WEIGHT: 15 lbs. |
