I can attest that Steve's mod can more than keep up with anyone's keying.
It's essentially the same sidetone oscillator circuit as used in several
other TT rigs like the Paragon II and Omni 6 and others.
-Paul, W9AC
----- Original Message -----
From: "Mike Hyder -N4NT-" <N4NT@charter.net>
To: <tentec@contesting.com>
Sent: Friday, February 07, 2003 18:41 PM
Subject: Re: [TenTec] playing with the Corsair II
> If memory serves, Steve's mod to the Corsair II sidetone has one drawback:
> it is a slower starting oscillator and therefore might not be very good
for
> QRQ.
>
> 73, Mike N4NT
>
> ----- Original Message -----
> From: "Chester" <calderman@cox.net>
> To: <tentec@contesting.com>
> Sent: Friday, February 07, 2003 5:17 PM
> Subject: RE: [TenTec] playing with the Corsair II
>
>
> > Hi Irv,
> >
> > Good to hear from ya.
> >
> > Irv, there is two things you can do to that sidetone (square
> > wave) generator in the CII. Since I had a spare Ten Tec audio filter
> > from an old Triton xcvr (think it's a model 285), I just removed R90
> > (47k) between the center arm of the S.T. LEVEL pot and the input to U5,
> > the audio amp (in my schematic). I ran a wire from the resistor hole
> > from the pot arm to the input of the filter and from the output of the
> > filter, I ran a second wire to the resistor hole going to the input of
> > the audio amp.
> >
> > I then 'jury-rigged' a mechanical means of physically mounting
> > the audio filter board just about the CII's IF board and I connected +12
> > and ground between the filter board and the IF board. (Of course you
> > could use any audio filter you have available to run that square wave
> > through to drastically improve the sidetone.) The old Triton board was
> > good enough because if I recall correct, it had three audio bandwidth's
> > to select from.
> >
> > The second mod you could try, and it's a much more professional
> > approach, is a circuit that Steve, N4LQ came up with to replace the
> > entire square wave sidetone generator. It's not complicated and you can
> > see his schematic at:
> >
> > http://www.albany.net/~bg/Mods/sidetone.htm
> >
> > I also just acquired another Corsair II (think this is about my
> > sixth CII!!), so I'm soon going to have to make the mod again if I
> > decide to keep this CII. Let me know which mod you make Irv.
> >
> > 73,
> >
> > Tom/W4BQF
> >
> > Chester Alderman
> > calderman@cox.net
> >
> > -----Original Message-----
> > From: tentec-bounces@contesting.com
> > [mailto:tentec-bounces@contesting.com] On Behalf Of Irvin Weinman
> > Sent: Friday, February 07, 2003 10:57 AM
> > To: tentec@contesting.com
> > Subject: Re: [TenTec] playing with the Corsair II
> >
> > Tom: I am acquiring another Corsair II. I remember years ago you had
> > given
> > out the tech data to CFO types, for an audio filter mod to tame the
> > annoying
> > sidetone. Do you still have that information around? Irv W7GX.
>
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