I do not believe that muting the mic when PTT is asserted from the
RS-232 input is a good idea. Many logging programs use the RS-232
signals to activate transmit.
Actually, I think that would be an excellent option: mute the mic input
when PTT is asserted via the CAT RS-232 RTS/DTR line. In a typical contest
setup, your computer logger/dvk'er will feed audio into K3 line in and
assert PTT via RS-232 CAT port. When you use your mic, you can use K3 PTT
input.
The K3 has a single internal line for PTT. It doesn't matter if it is
the front panel MIC, the rear panel PTT IN (e.g., footswitch), or
RTS|DTR from the RS232 connector. It can respond to PTT from any
available source; it cannot distinguish the source.
This would solve N1MM Logger's inability to mute the K3 mic while voice
keying because the K3 doesn't offer separate level controls for mic and line
(like the Orion does).
The K3 in fact does have separate gain controls for the LINE IN and MIC
paths. When using the front panel, you can only adjust one at a time,
since there is only one knob.
An external program could easily set the active Tx audio path from MIC
to LINE IN, send the audio, then switch the Tx audio path back to MIC.
73,
Lyle KK7P
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