Try this link. The mod for the OMNI C will work on the Corsair II.
Too bad you don't have the original Corsair. That one is easy.
As for an audio filer. An outboard audio filter will clean it up nicely
and there isn't enough delay to notice.
Date: Tue, 9 Nov 2004 17:09:21 +0000
Subject: [TenTec] Corsair II sidetone revisited
> I just did a thorough search of the TT archives re a
> solid fix to the buzz saw Corsair II sidetone. G3JXS
> had suggested and implemented an active filter solution
> with which he was pleased. Others said that such would
> lead to enough delay to affect QSK. It would seem that
> a simple one- or two-stage passive filter might have less
> delay and thus suffice as the 2nd harmonic is at about
> 1300-1500Hz (my sidetone is set at about 700 Hz, I was
> trying to match the 750 Hz CW offset but couldn't go
> quite that high). Before I dive into the books in an
> attempt to design such, has anyone on the reflector already
> done so?
> BTW: I used one of my Corsair IIs in SS this past weekend.
> (I am not quite through with the permanent station
> setup with the OmniVIs after our recent move and am using
> the C-II in a temp setup). I had a ball. The biggest
> problem I had in a contest setting was quickly and
> accurately zero-beating the CQing station. The SPOT
> button give a fairly soft and deep (!!) pitch to center
> on 0 Hz and the sidetone, as mentioned above, is neither
> matched to the offset nor harmonic free for a pitch
> matching method of zeroing ala OmniV and OmniVI.
> 73 K7GT
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