Does anyone have a “B” model?<div dir="auto">It looks like a regular compact 28KSR (AN/UGC-20 or 20A), except……<br><div dir="auto">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). </div><div dir="auto">So no +/-6v low level signaling capability. </div><div dir="auto"><br></div><div dir="auto">I just received the manual and will scan and post it in a few days. </div><div dir="auto"><br></div><div dir="auto">Verrrry Interesting…….</div><div dir="auto"><br></div></div>