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Re: [TenTec] DDS VFO as remote VFO?

To: tentec@contesting.com
Subject: Re: [TenTec] DDS VFO as remote VFO?
From: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Reply-to: geraldj@storm.weather.net, Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Tue, 21 Apr 2009 10:57:11 -0600
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
On Tue, 2009-04-21 at 09:08 -0700, lee berman wrote:
> I am attempting to correct the thermal drift on my 580 Delta PTO, by using a 
> Direct Digitally Synthesized VFO as a remote VFO.  The DDS output is said to 
> be ~500mV P-P (I've not measured it myself).  To date, I had no success.  I 
> wonder if anyone else on this reflector has successfully done this and can 
> point me in the right direction.  The unit I'm trying is the one by N3ZI.
> Other "fixes", such as PTO rebuild, and the K4DPK unit have worked well for 
> many other hams, but not me.  The drift is definitely in the PTO, defintely 
> thermally induced and does not settle out after hours of on time, so this is 
> my latest effort at ending it.
> thanks,  ~Lee, W1IDZ

Have you checked to see that all the temperature compensation capacitors
are soldered to the PC board? I found that to be a problem in a Kenwood
that drifted too much.

Looking at the PTO schematic for my Corsair II, I suspect the VFO
voltage is a lot more than half a volt peak to peak.

73, Jerry, K0CQ

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