Jerry, You might look at the side tone mod Steve Ellington N4LQ came up
with. It's very simple to do and you end up using the spot tone as your
side tone. Very easy on the ears and very easy to undo if you don't like
it. It does disable the spot feature but I'd say few people use that
anyway.
73 de Tim KØFL
Dr. Gerald N. Johnson wrote:
> On Wed, 2008-07-09 at 15:34 +0000, d.e.warnick@comcast.net wrote:
>
>> Night and day. Beyond the color of the front panel, check out these 2 url's
>>
>> http://tentecwiki.org/doku.php?id=560
>>
>> http://tentecwiki.org/doku.php?id=561
>>
>> Dave
>> WA3MKB
>>
>>
> Actually I didn't see much difference in substance on these pages.
> Corsair had 4 pole first filter, easily updated with the 8 pole model
> 220 filter. Corsair II had 5 dB more dynamic range probably because of
> the better rejection of the 8 pole filter.
>
> My Corsair II manual says narrow offset tuning is 1.5 KHz, these wiki
> say 0.5 KHz. My Corsair II moves much more, as much as 15 KHz with the
> wide offset tuning.
>
> Differences I didn't see noted on these wiki that I'm aware of include a
> bandswitch output from the Corsair, not on the II, for automatically
> switching a PA. The Corsair II has a narrow audio CW filter.
>
> There are grumbles about the sawtooth side tone. It has some advantages,
> its simple to make, and it starts and stops as fast as the RF output
> without thumps. Its really hard to get a clean sinewave oscillator to
> start and stop cleanly at high CW speeds. Its almost necessary to run a
> sinewave oscillator continuously and key its output. But then there can
> be a click or thump at start and stop unless those switch times are
> adjusted to be near zero crossings. One solution would be to run that
> oscillator and keying circuit to be an RF oscillator heterodyne to audio
> after switching. E.g. a monitor receiver. Long ago using a unijunction
> oscillator for AFSK RTTY I found that I could add resistance to the
> discharge circuit to make the waveform triangular instead of sawtooth
> and that reduced (in theory) the harmonic distortion to 8% total which
> is not quite so harsh as that from the sawtooth oscillator. Since of my
> first code practice oscillators was a buzzer, the sidetone of the
> Corsair doesn't sound all that bad and it truthfully follows the RF
> output.
>
> 73, Jerry, K0CQ
>
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