[Swan] Swan Three-Drifty

[D.Langston]

Hi Dennis and the group,

Here's the responses to the inquiry on the Swan VFO drift:

First, I'd like to say thanks very much to Pete Veach for  his suggestion about
the Deoxit drying time.. This seems to be right on the mark for my rig...

Next, thanks to Ken Sands, K8TFD,  for his suggestion:

> Open up the VFO and DEOXIT the band switch and variable capacitor
> wipers..73
> K8TFD
>




And thanks to Ian Jeffrey ZL4IZ for his suggestion:


> Hi Dan
>
> Look at the NPO capacitors in the VFO circuit.
> Sometimes a brief re-solder of  the connections can help
> Best to follow Swan's advice and replace the caps with known good ones
>
> All the best
> 73
> IAN
> ZL4IZ
>

The radio is  very stable now, even from a cold start exhibits good dial
linearity ..I keep looking at the band switched L-C tuned circuits used to
generate the VFO signals and expecting them to drift and they haven't...Guess
Swan must have really put some thought into their design..

I'm still experiencing some AGC overload on really strong signals say  over +40,
but I think the relay on top of the chassis needed a shot of Dexoit.. Has anyone
else experienced this?

The receive audio is real impressive and the AGC action seems smooth except for
the AGC overload conditions..

Hopefully it's back as a  Three-Fifty and not a Three-drifty!

73'

Dan
KO4RA






Dennis Lemonds wrote:

> Dan,
> Please share with the rest of us what responses you had to your inquiry.
> Thanks,
> Dennis
> WB4QCD
>
> ----- Original Message -----
> From: "D.Langston" <danman777@alltel.net>
> To: "Swan" <Swan@mailman.qth.net>
> Sent: Wednesday, February 18, 2004 6:06 PM
> Subject: Re: [Swan] Swan Three-Drifty
>
> > Thanks for the replies and advice on the Swan 350....I readjusted the VFO
> > trimmer capacitors (again) and so far, so good..Good stability and dial
> > tracking...
> >
> > If anyone has a 350 parts rig for sale I may be in need of a replacement S
> > meter, as mine is occasionally sticking .
> >
> >
> > 73'
> >
> > Dan
> > KO4RA
> >
> > D.Langston wrote:
> >
> > > I'm trying to   get the VFO tracking adjusted on a 350.. After about an
> > > hour warm up, I adjusted theVFO trimmer capacitor on 40 meters and had
> > > good dial tracking.almost perfect..turned the rig off and now TX/RX is
> > > about 50 KC higher than what the dial reads (after a good warm up)..80
> > > and 20 meters are OK..My guess is the temperature compensating capacitor
> > > for the 40 meter VFO..
> > >
> > > The bandswitch wafers have been cleaned with Dexoit..
> > >
> > > Any ideas?
> > >
> > > 73'
> > >
> > > Dan
> > >
> > > _______________________________________________
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> >
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> >
> >