Thanks, everyone who responded to my earlier query - I now understand
that the circuit in the K3 is equivalent to the old bipolar transistor
switches we used to use for serial port CW/PTT keying.
So here's my problem - I have a small 12V DPDT relay that I want to use
to switch the power to my SDR's preamp and active antenna - in other
words, to cut them off when my K3 is in transmit. What I can't figure
out (be patient with a history major, please!) is how to use the Key Out
jack to switch the power to the relay , while using the same 12V supply
to power both the relay and the preamp/active antenna combo.
Ideally, the 12V relay would only be on when the K3's PTT was on. The
thing that's driving me nuts is that I had this working, once before,
and then tore it apart for not very good reasons. Now I can't replicate
what I had.
Would anyone be willing to go offline and help me figure this out?
--
73, Pete N4ZR
Check out the Reverse Beacon Network
at <http://reversebeacon.net>, now
spotting RTTY activity worldwide.
For spots, please use your favorite
"retail" DX cluster.
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