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Collins 312B-4/5

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Desktop Shortwave Station Control

The 312B-4 and 312B-5 Station Controls contain a directional coupler and wattmeter, a speaker, a phone patch, and appropriate switching circuitry. The same types of directional coupler and wattmeter, phone patch, and speaker are used in both the 312B-4 and 312B-5. In addition, the 312B-5 contains an auxiliary variable frequency oscillator (VFO) to provide separate transmit and receive frequencies when used with the KWM-2 or KWM-2A Transceivers.

The wattmeter indicates power levels within the ranges of 0-200 or 0-2000 watts, forward or reflected. It is accurate over the range of 2 to 30 MHz, but should not be used on higher frequencies. The phone patch includes circuitry which allows VOX phone patch operation. It can also be switched manually if desired. The VFO in the 312B-5 is the same as that used in KWM-2/2A and S/Line equipment. Switching circuits are provided to allow operation of KWM-2/2A Transceivers on different transmit and receive frequencies or transmit-receive operation on the same frequency using either VFO.

Specifications
Type
Desktop Amateur HF Station Control 
Frequency range RX
2-30MHz 
TX
Frequency stability
Less than 100 Hz after 30-minute warmup 
Tuning steps
Filters
Receiver
Modulations
Sensitivity
Selectivity
Receiver system
IF-frequencies
Image rejection
Audio output
Transmitter
Modulations
RF-output
Connections
Antenna
Impedance
52 (unbalanced)Ω 
Electrical
Power requirements
Mains 
Current drain RX
TX
Physical
Dimensions (w×h×d)
275 × 190 × 300 mm (10.83 × 7.48 × 11.81 in) including feet 
Weight
3.85 kg (8.5 lbs)  
Form factor
Desktop 
Manufactured
Between 19xx and 19xx in USA 
Other features
Memories
Usage
Amateur / Ham radio operators 
Manufacturer
Collins 
Model
312B-4/5
Features
 
Manuals, Diagrams and Brochures
 
None available  
 
 
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