[Milsurplus] scr-287 integration question

[Jack Antonio]

One of the projects lately is putting together
an SCR-287. I'm connecting a BC-375E and BC-348R
together through a terminal box, and bringing audio
to a BC-1366 jack box. Ultimate goal is an operating
radio op position, with SCR-269, SCR-274N, and RC-36
interphone.

Almost everything works as it should, but I have one
problem I wonder if anybody has seen.

The '375 mutes the '348 by opening a set of
normally closed contacts, this takes screen voltage
off the the IF and one of the RF amps in the receiver.

Mine does this, but the receiver still operates well enough
to hear the transmitter. Even with the antenna leads
disconnected from the receiver. It is not grid rectification
or audio coming in the power socket, as it is tunable.

Just wondering if this is a design feature to provide side tone,
or do I have some other issue?

Thanks

Jack Antonio WA7DIA
scr287 at sbcglobal.net