[Milsurplus] RAK/RAL Muting

[William Props]

I haven't tried grounding the antenna input. I'll play with it some more
tonight.

How was this accomplished on the ships and subs? Did they have some sort of
sidetone oscillator, or no sidetone at all? Any sort of antenna attenuation
when used in combination with a transmitter? I was under the impression the
receivers and transmitters had separate antennas, and sending was monitored
in the receivers.

Thanks
Chris
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