[ARC5] Netting Switch

[David Stinson]

----- Original Message ----- 

> 1.  Do the Command Set transmitters let the oscillator run all the time?
No; they do not.  The system keys all B+, low and high, through a
single relay located in the modulator chassis.
"Keying" was not a factor in the "ARC-5" Command Set design
because they were designed for Voice mode.
CW keying was very secondary.

As for frequency stability- when the sets are run as-designed with
the dynamotors, they are exceptionally stable- better than any
commercial "ham" gear of the 1950s and 60s that I ever saw.
If you are running your SCR-274N, GF/RU, SCR-183, AN/ARC-5 etc.
as-designed and the transmitter drifts significantly after a decent warm-up,
something is wrong.

> 2.  If you have a receiver and transmitter fired up and sitting
>essentially side by side as they commonly were,
>even without the Zero Beat mods that David describes,
>can't you receive the transmitter oscillator to some degree
>with the receiver?
Not if used as-designed.  The "muting" relays disconnect the receiver
audio outputs and connect the audio busses to the transmitter
sidetone lines.  The receivers are, literally, "muted."

73 Dave S.