[GreenKeys] AN/UGC-20B compact 28KSR oddball

[Nick England]

Does anyone have a “B” model?
It looks like a regular compact 28KSR (AN/UGC-20 or 20A), except……
It has a photoelectric keyboard and distributor like the TEMPEST AN/UGC-77
but also includes an internal keyer card so it will key a 60ma loop (or
output a 1.5v/70uA signal).
So no +/-6v low level signaling capability.

I just received the manual and will scan and post it in a few days.

Verrrry Interesting…….
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