[ARC5] Questions that need answers

[Gordon White]

Jay is correct.  The jumper in the adapter in the receivers is in the 
low-voltage line.  Having said that, There are different connections in 
the front adapter area.  While the RAT, RAV, ARA, SCR-274-N and early 
AN/ARC-5 receivers seem to be the same, with the following connections:

1 - sensitivity control
2 - ground
3 - blank
4 - tel or audio output to instrument landing equipment
5 - cw osc.  shutoff
6 - low voltage to filaments and dynamotor
7 - low voltage from supply
8 - B+ voltage

    my experience is that some of the Western Electric SCR-274-N 
receivers did not have all the connections in the adapter, in fact did 
not have all the pins.

    The late AN/ARC-5 (R-111 and R-113) receivers had no connections to 
pins 3, 4, 5, and 8.

- Gordon