Re: [TenTec] ARGOSY 525 PTO DRIFT?

[Bwana Bob <wb2vuf@qsl.net>]

Ed:

That's excellent, very low drift. Hardened PTO grease usually causes 
frequency jumping, not warm-up drift. I had it really bad with my 
Corsair, until I rebuilt the PTO. The components were not really worn, 
it was just the grease that was causing the problem.
                        73,

                        Bob WB2VUF
Ed Worst wrote:
> Hi Bob,
>
> I get about +/- 20Hz drift after a half hour of warm up from a cold start.
> I think I'll try the PTO rebuild first before modifying the circuit.  Still
> have to talk with TenTec to see what they have to say.
>
> Tnx es 73,
> ed - k9ew
>
> ----- Original Message ----- 
> From: "Bwana Bob" <wb2vuf@qsl.net>
> To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
> Cc: "QRP-L" <qrp-l@mailman.qth.net>; "TenTec List" <Tentec@mailman.qth.net>
> Sent: Monday, October 03, 2005 21:58 PM
> Subject: Re: [TenTec] ARGOSY 525 PTO DRIFT?
>
>
>
> > Ed:
> >
> > Try different values for the temperature compensating capacitor. This is
> >  selected at the factory, but you may get better results from another
> > value. Only trouble is, N750 caps are hard to find, but I think Mouser
> > carries them.
> >
> > 73,
> >
> > Bob WB2VUF
> >
> > Ed Worst wrote:
> >
> >
> > > I tried my Argosy 525 on MFSK tonight, and had to turn switch rigs
> because
>
> > > of the PTO drift.  Is there a known problem with PTO drift on this rig?
> If
>
> > > there is, what's the fix?
> > >
> > > Thanks,
> > > ed - k9ew
> > >
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