[ARC5] Non destructive SCR-274/ARC-5 spot switch

[J Mcvey]

If you are using the receivers to monitor CW only, then you don't need a spot switch.
When adding AM ,  you will find it necessary to use the receiver control cable because without switching the receiver rack relays to monitor mode,the mike feedback is quite bad. Adding the receiver control cable gave me side tone and modulation monitoring from the BC-456 without the annoying feedback. ( nice clean tone , too)
However, I could no longer zero beat the rx/tx.
I added a box with a toggle switch that interrupts the the relay control wire (pin #5) to the rack , so I can get the tx on the receive frequency or the receiver on the transmit frequency.Works as advertised...



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