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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: Fri, 27 Oct 2017 10:01:11 +0100
List-post: <mailto:tentec@contesting.com>
Curt,

The Arduino analogue inputs provide 1024 level discrimination. Translated to +/- 1000Hz that equates to 2Hz steps. I don't know why that would be considered not smooth enough?

I sent you the source code by private email yesterday.

Steve G3TXQ

On 26/10/2017 21:49, Curt Benjamin via TenTec wrote:
Steve, I've run that idea by a few Arduino guys including AD7C himself. They say yes, you 
can use one of the analog pins and you can "map" the 0-5VDC to say, an offset 
of +/- 1000 Hz but they say it's not smooth enough to use as RIT. I would like to try but 
I don't know enough about writing the code to add that function.

Regarding your PIC controller, I have a PIC ordered so I can copy your circuit. 
I'd rather use an AVR since I have some and also a programmer. Is there any way 
you could port your PIC code to an AVR, or would you be willing to release your 
source code so I can try to do it?

Curt K8AI



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