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@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@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
>
>
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
______________________________________________________________________
Post your free ad now! http://personals.yahoo.ca
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|