[TenTec] Re: DRIFTING (lab)

[David McClafferty]

I did some testing of this on an Omni C. There are 2
varicap diodes in the PTO circuit, one for RIT/XIT and
one for band offset. If you take these diodes out the
circuit the drift is practically nil. I never found
any practical fix for this problem.

Dave, VE1ADH

 --- Tom North <tomnorth at airmail.net> wrote: >  Same
experience/opinion here (w/2 of 'em) - ~300Hz
> drift for 30 minutes,
> then it stays put. All the rigs of that vintage (and
> a number since) need to
> 'come to temperature' before they are stable.
> 
> 73,
> Tom  N5OZQ
> 
> > 3 kilo cycles or 3 hundred cycles? 3 hundred is
> about normal for the pto =
> > rigs during warm-up. The stability factor
> according to the Ten-Tec =
> > manuals is after a 30 minute warm-up. If it is
> drifting 3 kc's I would =
> > say there is a problem in the pto.
> > 73. Ed/w4wvw
> >   ----- Original Message -----=20
> >   From: lab=20
> >   To: tentec at contesting.com=20
> >   Sent: Saturday, December 06, 2003 5:39 AM
> >   Subject: [TenTec] DRIFTING
> >
> >
> >   HELLO
> >    HAVE A TEN TEC OMNI C 546 WHICH I BOUGHT USED
> ABT 12 YEARS AGO . FOR =
> > THE FIRST TEN TO TWENTY MUNUTES WHEN TURNED ON
> COLD IT DRIFTS SLOWLY =
> > ABOUT THREE KCS I LOVE THE QSK  BUT THE DRIFT
> BOTHERS ME .IS IT POSSIBLE =
> > TO FIX? AS IT HAS DONE IT EVERSINCE I BOUBHT IT ? 
> THANKS MEL WA9YQA=20
> 
> 
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