> The audio was detected to control ptt logic before
> the delayed audio was presented to the mic circuit.
> -
> I believe external amplifier ptt logic was also
> available from the circuit which installed between
> the mic and the radio.
The MFJ 495 CW keyer does that with CW. It has a PTT output
that closes the moment the key is closed, but the actual CW to
the radio is delayed an adjustable amount.
The main idea was a CW contesting interface with lockout for two
radios on one band. It has a PTT or manual key input, so you can
use external sources to key it. Unfortunately it does not process
audio.
I had a DSP unit under works with internal VOX that would delay
the audio output and split-band processing (with two/three tone test
and other neat goodies) but no one ever wanted to market the
project so I put it aside.
73, Tom W8JI
W8JI@contesting.com
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