After reviewing the mod from N4LQ I see it's for the Corsair only not
the Corsair II
Sorry for my confusion
de Tim KØFL
Tim Randa wrote:
> 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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