After using a Heath 1410 keyer for several years with my Omni D, I decided to
try one of the newer PIC keyers.
The keyer, supplied by cwtouchkeyer.com, is based on the Jackson Harbor PK4.
It uses a 2N7000 transistor for its switching output. Output as measured by a
simple VOM is .001 volts; I am told there are about 2.5 ohms across the
keying output.
When I plugged the keyer into the Omni D I got continuous key down --even with
the keyer off! With some trepidation I decided to try reversing polarity
--ground of keyer wired to center conductor of Omni D input key jack (and tip
of keyer now to omni RCA ground).
Result: Rig now appears to key normally. I tried this for several minutes,
with no apparent adverse effects. But not really understanding what was going
on, I decided to go back to the Heath.
Question: Why does the normal configuration not work? And will reverse
polarity configuration (eventually) do damage to the Omni D keying circuits?
Thanks,
Mike K2CSJ
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