Wanted: WS19 No3 control unit

[Chris Suslowicz]

Originally Posted by Bruce Parker

The driver's box is interesting. It's labelled 'CALL COMMANDER' and has a push button. If the 19 set is set to intercom the driver can hear and speak to the crew through his headset. If the 19 set is set to 'A' (long range) or 'B' (short range he is of of the loop. He must press the button on his control unit which activates a buzzer in the headset of the crew talking on the A or B sets and they must switch back to intercom to hear him.

Pin 5 (Signal) on the supply unit input connector is passed through to pin 9 on the control harness. This is connected to the headset (pin 2) on the "Commander's" droplead - though if that lead is switched to the IC position the buzzer will be heard by anyone else switched to IC.

The various control units are wired in different ways, some boxes (1A) have both dropleads in parallel - the No.1 had one switched (for the commander (or operator if that was the only control unit)) and the other marked as "I/C ONLY" for the gunner.

Chris.