Tube List: 6AU6 / 7543 (1) 6AZ8 (3) 6BN8 (3) 6CL6 (1) 6DC6 (1) 6EB8 (1) 6U8A (4) 12AT7 (2) 6146 (2) Description:
The KWM-2/2A was unmatched in performance and dependability for mobile and fixed station applications. The transceiver's power input is 175 watts PEP on SSB or 160 watts on CW. It transmits voice or modified break-in CW. The KWM-2A utilizes an additional crystal board allowing the operator to switch-select up to 14 optional crystals which can be outside the amateur bands. Frequencies near range edges may require trimmer adjustment for proper operation. The KWM-2A can be used for RTTY when a 516F- 2 Power Supply and external cooling air are employed.
The transceiver is finished in light gray enamel with a simulated leather front panel to match the S/Line and its accessories. Compactness and efficiency of the KWM-2A are achieved through Collins' advanced design in which all tuned circuits and several tubes function in the dual role of transmitting and receiving. The same oscillators, Mechanical Filter, and RF amplifier serve both the transmitter and receiver. CW break-in and sidetone monitoring circuits are built in.
Easily accessible controls on the front panel of the KWM-2A include the OFF-ON-NB-CAL Switch, EXCITER TUNING, ZERO SET, PA TUNING, LOADING, MIC GAIN, BAND Switch, AF GAIN, RF GAIN, EMISSION, and METER Switch.
Specifications: FREQUENCY RANGE:
Any 200 kHz range from 3.4 to 30 MHz (except 5.0 to 6.5 MHz) using the appropriate crystal.
The following crystals are supplied:
80 meters: 3.4 - 3.6 MHz, 3.6 - 3.8 MHz, and 3.8 - 4.0 MHz.
40 meters: 7.0 - 7.2 MHz and 7.2 - 7.4 MHz.
20 meters: 14.0 - 14.2 MHz and 14.2 - 14.4 MHz.
WWV (Calibration): 14.8 - 15.0 MHz.
15 meters: 21.0 - 21.2 MHz, 21.2 - 21.4 MHz, and 21.4 - 21.6 MHz.
10 meters: 28.5 - 28.7 MHz.
FREQUENCY CONTROL:
70K-2 Permeability Tuned Oscillator (PTO)
MODES:
SSB (selectable sidebands), CW, or RTTY with 516F-2 power supply and external cooling air.
TYPE OF SERVICE:
SSB continuous; CW 50% duty cycle.
POWER REQUIREMENTS:
Power can be delivered by an external supply such as the 516F-2, PM-2, MP-1, or 516E-2 which must furnish 800 vdc at 230 ma; 285 v dc at 210 ma; 6.3 v at 11 amps, and from -55 to -80 vdc with no current requirement. Heater supply may also be 12.6 v at 5.5 amps or 24 v at 2.75 amps. Reduced final plate voltage and current typical of mobile installations will reduce power output specifications. With the 516F-2, power consumption is approximately 190 watts in receive, 430 watts in lock-key, and 290 watts normal voice transmit.
PLATE INPUT POWER:
175 watts PEP on SSB; 160 watts on CW.
OUTPUT POWER (50 ohm load):
100 watts PEP (3.4-15 MHz); 90 watts PEP (15-25 MHz); 80 watts PEP (25-30 MHz).
HARMONIC AND OTHER SPURIOUS RADIATION:
Carrier suppression -50 db; unwanted sideband -50 db; oscillator feed-through and/or mixer products -50 db except -40 db at 3500 kHz. Second harmonic -40 db. Third order distortion -30 db.
NOISE LEVEL:
40 db below single tone carrier.
CALIBRATOR:
100 kHz crystal oscillator.
FREQUENCY STABILITY:
Within 100 Hz during any one-hour period following 20 minute warm-up. Not more than 100 Hz with 10% line voltage variation.
CALIBRATION ACCURACY:
I kHz after midband calibration.
BACKLASH:
Not more than 50 Hz.
VISUAL DIAL ACCURACY:
200 Hz on all bands.
OUTPUT IMPEDANCE:
Variable, 50 ohms nominal, Pi-network capable of matching up to 2:1 VSWR.
KEYING CHARACTERISTICS:
Keying is free of chirps and clicks. Break-in CW and side tone provided.
AUDIO INPUT:
High impedance microphone or 312B-4,-5 phone patch.
AUDIO FREQUENCY RESPONSE:
300 - 2400 Hz nominal, determined by Mechanical Filter.
AUDIO COMPRESSION CHARACTERISTICS:
ALC operates on IF and RF amplifier stages and is capable of 10 db compression.
RF FEEDBACK:
Approximately 10 db of RF feedback around PA and driver for improved linearity.
RECEIVER SENSITIVITY:
0.5 uv for 10 db signal-plus-noise-to-noise ratio in amateur bands.
RECEIVER SELECTIVITY:
2.1 kHz nominal bandwidth at 6 db down; 4.2 kHz bandwidth at 60 db down as determined by Mechanical Filter.
RECEIVER SPURIOUS RESPONSE:
Image rejection better than 40 db. Internal spurious below I uv equivalent antenna input.
RECEIVER OUTPUT LEVEL:
1.0 watt maximum.
AUTOMATIC GAIN CONTROL:
The audio output level does not change more than 20 db as the input signal is changed from 10 uv to I v. Fast attack and slow release provide excellent AVC action on voice and CW.
VIBRATIONS:
2 g at 10-33 Hz.
AMBIENT TEMPERATURE:
O'- 50' C.
AMBIENT HUMIDITY:
0% - 90%.
ALTITUDE:
0-10,000 ft.
PROTECTIVE DEVICES:
PA cage is interlocked.
SIZE:
With feet - 14 3/4" W, 7 3/4" H, 14" D (37.47 cm W, 19.69 cm H, 35.56 cm D).
WEIGHT:
18 lbs., 3 oz. (8.25 kg).
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