[TenTec] Re: DRIFTING (lab)

[John]

Hi Dave,

Did removing the bias voltage help reduce the drift any, or did you have to
physically remove the varicap diodes before seeing any improvement?

Thanks,

John  W0DC

----- Original Message -----
From: "David McClafferty" <ve1adh at yahoo.ca>
To: <tentec at contesting.com>
Sent: Monday, December 08, 2003 2:28 PM
Subject: Re: [TenTec] Re: DRIFTING (lab)


> 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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