312B-4/-5 Station Control

THE COLLINS 312B-4/5 STATION CONTROL

The 312B-4 and 312B-5 Station Controls. Contains 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 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 to 200 or 0 to 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.

312B-4/5 SPECIFICATIONS

DIRECTIONAL COUPLER AND WATTMETER



     Frequency range ..... 2 to 30 MHz.

     Impedance ........... 52 ohms unbalanced

     Wattmeter scales .... 200 watts, forward
                           2000 watts, forward
                           200 watts, reflected
                           2000 watts, reflected

     Size ................ 10-3/4" w x 7-1/2" h x 11-3/4" d including feet

     Weight .............. 8-1/2 Lb

     Maximum power ....... 2000 watts forward power

     Power loss .......... Less than 0.1 percent

     Introduced SWR ...... Less than  1.05:1,  2 to 30 MHz

PHONE PATCH



     Input impedance ..... 600 ohms

     Output impedance .... 600 ohms

PM SPEAKER



     Impedance ........... 3 to 4 ohms
     Size ............ ... 5 by 7 inches

VFO IN 312B-5



     Frequency range ..... 2.5 to 2.7 MHz.

     Calibration accuracy. Within 1 kHz after midband calibration.

     Drift ............... Less than 100 Hz after 30-minute warmup.

     Dial backlash ....... Less than 50 Hz.

     Power ..........Supplied by KWM-2 or KWM-2A transceiver PS.

Under the hood...