Dave and the group,
Mine was showing some instability in the PLL, the rig almost sounded like it
was yodeling after it warmed up with use. After trying all the suggestions
over the phone with a scope and freq counter in strategic places and a few
adjustments, I gave up and sent it back to TT for repairs.
The repair order says:
Changed R12 to 47 Ohm and added 100uh choke to stabilize xtal osc. L. O. PLL
alignment.
Xtal osc. alignment.
set ref. freq.
This was done 10-13-98 and the problem has never returned.
I'm not sure that this is the problem you are having but if so, maybe this
will help.
73, Chuck (AAØRI)
----- Original Message -----
From: David Hammond <dhhdeh@concentric.net>
To: tentec reflector <tentec@contesting.com>
Sent: Monday, January 08, 2001 5:57 PM
Subject: [TenTec] TCXO in Older Omni VI's
>
> Hi Everyone,
>
> Has anyone with an older Omni VI had the opportunity to have the crystal
> oven on the logic board replaced with the TXCO now used in current
> production lots of the Omni VI+?
>
> If yes, has it improved frequency stability of the rig?
>
> My 5 year old Omni VI has developed some annoying frequency instability
from
> what I suspect is the 10 mhz crystal oven. New crystals and ceramic
> trimmers in the BFO circuit have not improved the problem. Drift is out
of
> spec significantly even after 30 minute warm up.
>
> Would welcome any comments.
>
> 73 de N1LQ-Dave
>
>
> --
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> Submissions: tentec@contesting.com
> Administrative requests: tentec-REQUEST@contesting.com
> Problems: owner-tentec@contesting.com
>
--
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