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Re: [TenTec] DDS PTO replacement for old Ten Tec rigs

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] DDS PTO replacement for old Ten Tec rigs
From: Steve Hunt <steve@karinya.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Thu, 26 Oct 2017 09:30:06 +0100
List-post: <mailto:tentec@contesting.com>
Do any of the ideas here help:
http://www.karinya.net/g3txq/corsair_pto/

Steve G3TXQ

On 26/10/2017 01:47, Curt Benjamin via TenTec wrote:
Guys, since the N4YG DDS is no longer available and too expensive anyway, I 
have been exploring the idea of making my own. So far, I've taken the Arduino 
code to control one of those $8 AD9850 DDS modules from China to tune from 5 to 
5.5MHz but I haven't found a way to add an RIT line to it.
What I'm thinking might work is making something like a 2MHz xtal oscillator 
with a voltage-controlled shift line using a varactor and mixing that with the 
Arduino/AD9850 DDS that tunes from 3 to 3.5 MHz instead.
I don't think any of these frequencies would pose any problems in either the DC 
receiver in the C21/22 or in any of the superhets of the other various models 
but I'm not sure. What do you folks think? Is that a good scheme or should I 
change the frequencies. I picked 2MHz because it's available in a off-the-shelf 
crystal. Thanks.
Curt, K8AI
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