Bob....
Alan has a good point. If you look at the schematic of the Corsair, you will
find the xtal mixing scheme used for each band. There may be some
possibility for you to replace the xtals for the 'bad' bands with more
stable xtals...along with some temperature compensating capacitors in each
band's circuit. It could possibly provide you with the stability your
looking for in that rig. You also might think about really cleaning the
contacts on the band switch really good as with age, those switch contacts
do tend to get 'dirty'.
But isn't it also true that AFC in most PSK programs will easily handle the
present drift you are experiencing?
Tom - W4BQF
----- Original Message -----
From: "Bob Towers" <mm3kdz@beeb.net>
To: <tentec@contesting.com>
Sent: Tuesday, March 30, 2004 8:22 AM
Subject: Re: [TenTec] Corsair II warble
*********** REPLY SEPARATOR ***********
On 30/03/2004 at 07:51 Tommy wrote:
>Unfortunately Bob, you have a good radio that was designed many years
>before
>digital modes were used and at that time, the stability you are quoting
>would be way above par for those radios. If your getting a max of 10Hz freq
>drift, count your blessings. The PTO is not going to do any better.
>
>Tom - W4BQF
>
Tom,
Many thanks for the reply...
You are right, but what intrigues - and annoys me - is that on 15m and 30m
the stability is more than good enough for me. If the PTO is this good on
these bands, how come it deteriorates when running 20m, for instance? It's a
mystery to me. Also, I have a Kenwood TS-120V which isn't a patch on the
Corsair as far as performance is concerned but which has pretty good
stability, better than the Corsair on 20m.
73
Bob
MM3Kdz
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