I always use slow QSK with connector 52 removed and am VERY happy. I
suspect alleviating the audio clicks in fast QSK might be quite a
challenging task.
73, Barry N1EU
On Mon, Nov 21, 2016 at 1:22 PM, gerd Groos <df9ts.cw@gmail.com> wrote:
> Hello,
> I friend borrowed me an Omni VI, which is producing very disturbing
> audio-clicks in fast QSK mode, at any CW speeds, even with very slow
> keying.
>
> The clicks are louder than the received signal and quite distracting.
>
> I am including symptoms below for those who want to read on. Any ideas, and
> suggestions highly welcome.
>
> 73
>
> Gerd DF9TS.
>
> ===
>
> The TRX is click-free when connected to a dummy load. Symptoms appear with
> antenna signal (or white noise) on the receiver input.
>
> The clicks are produced in fast QSK only on key release ("key up") only.
> "Key down" is not producing clicks.
> TX signal is ok and click-less and without chirp (as verified with 2nd
> receiver). RX audio signal is with these clicks.
>
> I verified the "TD". "T" and "R" signals generated for internal tx/rx
> switching with a scope. They look similar to a quick Spice simulation I did
> of the circuit. I did however not see a lag between "T" going down and "R"
> going up.
>
> Slow QSK is without such clicks.
>
> On "slow QSK" the RX audio comes back up slowly on "key up".
> On "fast QSK" the RX audio comes back immediately on "key up".
>
> This makes me wonder if the cause is a timing issue on "key up".
>
> I did align the TRX following the manual, twice. BFO is well aligned also.
> The rig behaves as expected. Sensitivity and filters ok.
>
> Removing connector 52, extensively discussed in this list, makes no
> difference for this OMNI VI´s clicking.
>
> The clicks are present on Loudspeaker as well as on "Audio Out" cinch
> socket.
>
> Tnx for reading this far ;-)
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