Collins KWM-2 and KWM-2A Transceiver Specifications

KWM-2 Transceiver

The KWM-2 transceiver receives and transmits single-sideband or CW signals in all amateur bands between 3.4 mc and 30 mc.

Frequency Coverage

The transceiver coverage is in 14 bands, each 200 kilocycles wide. With the crystals furnished, they conver the entire amateur bands of 80, 40, 20, and 15 meters, a 14.8- to 15.0mc band including WWV, and the 28.5- to 28.7-mc portion of the 10-meter band. The two remaining crystal sockets may be used for crystals selected to provide two additional 200-kc bands within the 10-meter band. Other crystals may be substituted for those furnished to place the transceiver at other frequencies through the range.

Requirements for Operation.

The transceiver requires a 110-volt, 50- to 60-cycles-per-second, a-c power source, such as the 516F-2, for fixed-station operation. It consumes approximately 235 watts of power from the line in receive function and approximately 475 watts in transmit function. The transceiver may be operated mobile by using a power supply such as the 516E-1 for 12-volt d-c operation or a 516E-2 for 24- to 28-volt operation. In mobile operation the transceiver requires 800 volts dc at approximately 250 ma; 275 volts dc at approximately 175 ma; a bias supply adjustable between -60 and -80 volts; and 6, 12, or 24 volts d-c filament supply at 11.0, 5.5, or 2.75 amperes respectively. Any high-impedence crystal or dynamic microphone may be used. A 4-ohm speaker is required. The antenna and feed system must present a 50-ohm load with swr not exceeding 2.0 to 1.

Specifications.

Frequency range	3.4 to 30.0 megacycles. With crystals furnished, bands are as follows: 80 meters - 3.4 to 3.6 mc, 3.6 to 3.8 mc, and 3.8 to 4.0 mc. 40 meters - 7.0 to 7.2 mc, and 7.2 to 7.4 mc. 20 meters - 14.0 to 14.2 mc, 14.2 to 14.4 mc, and 14.8 to 15.0 mc (WWV). 15 meters - 21.0 to 21.2 mc, 21.2 to 21.4 mc, and 21.4 to 21.6 mc. 10 meters - 28.5 to 28.7 mc.
Mode	Single sideband (either sideband selectable) or CW.
Type of service	SSB-continuous; CW-50% duty cycle.
Power consumption from ac line	225 watts in receive function. 475 watts in transmit function.
Plate power input	175 watts PEP on SSB, 160 watts on CW.
Power output	100 watts PEP (nominal) into 50 ohms.
Microphone input impedence	High impedence.
R-f output impedence	50 ohms with not more than 2.0-to-1 swr.
R-f input impedence	50 ohms.
Matching speaker impedence	4 ohms.
Marching phone-patch impedence	500 to 600 ohms, receive output to phone patch; high impedence phone-patch input to transmitter.
Frequency stability	Total variation after warmup not more than 100 cps.
Calibration accuracy	1 kilocycle.
Keying	Break-in.
Audio-frequency response	300-2400 cps +/-6 db.
Carrier suppression	Carrier 50 db down from output signal
Unwanted sideband	50 db down from output signal
Oscillator feedthrough or mixer products (undesired)	50 db down from output signal
Second harmonic radiation	50 db down from output signal
Third order distortion	30 db down from output signal
Receiver sensitivity	0.5 microvolt for 10-db signal to noise ratio for SSB operation in amateur bands.
Receiver selectivity	2.1 kc at 6 db down, 4.2 kc at 60 db down.
Receiver spurious responses	Image rejection better than 50 db. Internal spurious signals below one microvolt equivalent antenna input.
Receiver output level	1.0 watt maximum.
Size	7-3/4 inches high, 15-1/8 inches wide, 13-3/42 inches deep, overall.
Weight	18 pounds, 3 ounces.