[TenTec] FW: [QRP-L] Next problem with cw on Corsair

[Dr. Gerald N. Johnson]

On Sun, 2006-11-19 at 20:59 +0000, Steve, G4GXL wrote:
> > Thanks for the help in getting to run cw on my Corsair II. Now the
> > problem is with thesidetone
> 
> Vince
> 
> The sidetone is just about the only thing I don't like on the Corsair II.
> Even when it's working as designed the 'sawtooth' note is just unpleasant.
> 
> If you have an external keyer then use (or build) the oscillator in that.
> 
> There are some published mods for the Corsair sidetone but the only
> ones I found were for the original Corsair and were unsuitable for the
> MkII version.
> 
> --
> 73
> Steve, G4GXL
> --
Thing is any other audio oscillator with a fine waveform takes a while
to start and to stop and won't follow high speed keying well and the
sawtooth is has as fast a rise and fall as the RF output. Cleaning with
a low pass filter adds delay too. I suppose one could rig a continuously
running sine wave oscillator and switch the audio from it on and off and
keep up. But that's more complicated and its hard to get rid of the back
wave.
-- 
73, Jerry, K0CQ,
All content copyright Dr. Gerald N. Johnson, electrical engineer