[Moon-net] Problem with DEMI Transverter

[Edward Cole]

Russ,

That's an interesting comment.  I jsut bought a DEMI 144/28 xvtr 
(low-power) kit and have seen nearly no drift that I can detect (less 
than 5-Hz I would say).  The kit I bought in January uses a PTC to 
heat stabilize the xtal.  I leave it powered full time so no warm-up 
drift.  I am using it with my SDR-IQ so cannot say that it might 
drift in Tx (I'm only using the receive side).  But not having a 
power module I would guess there would not be enough heat shift in Tx 
to be dectectable.

Could be the newer model has solved much of this problem?  It will be 
totally gone when I have my Jupiter-GPS/Reflock operational to lock 
the oscillator.

73 Ed - KL7UW
PS: I will be QRV on 5/13 for ARI Contest and to test my SDR-IQ for 
working random JT65 on 2m-eme.  Be out of town 5/12 so no eme.

At 04:13 AM 5/11/2007, Russ K2TXB wrote:
>Drift has always been a problem with that transverter.  Discuss it with
>Steve at DEMI.  He is very responsive and will probably be able to offer a
>fix for you.  DEMI has no email address but you can get contact information
>the web site at:
>
>http://www.downeastmicrowave.com/
>
>Good luck,
>
>73, Russ K2TXB
>
> > -----Original Message-----
> > From: moon-net-bounces at list-serv.davidv.net
> > [mailto:moon-net-bounces at list-serv.davidv.net] On Behalf Of
> > John Germanos
> > Sent: Friday, May 11, 2007 7:46 AM
> > To: Moon-Net posting msgs
> > Subject: [Moon-net] Problem with DEMI Transverter
> >
> > I am experiencing drifting with my DEMI Model 144-28HP
> > transverter. Every so often, received signals drift slowly
> > plus and minus a few hundred cycles. I have also noted that
> > after a couple of transmissions using JT65, my next
> > transmission frequency could be as much as 1Khz away from
> > original transmission frequency.
> >
> > Does anyone have any ideas of what might be causing this.
> >
> > John WB9PNU
>
>
>
>
>
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