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Re: [TenTec] Corsair II DDS VFO

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] Corsair II DDS VFO
From: Steve Hunt <steve@karinya.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Tue, 22 Mar 2011 18:53:54 +0000
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
Readout accuracy is entirely dependent on the Corsair's "native" counter 
board; VFO frequency stability is entirely dependent on the DDS 
reference oscillator.

What the DDS does *not* have is the 10kHz offset to compensate for the 
offset in the band xtals on 30m, 15m and 10m. That means if you set the 
tuning to exactly 3,500kHz on 80m and then switch to 30m, say, the 
readout will be 9,990kHz. That's no big deal for me - the dial skirt 
becomes irrelevant when using the DDS; in fact I've removed mine. It's 
the rightmost Corsair here:


If I'm honest, the only thing I miss is the Spot function - the Spot 
button is now used for A/B/Split switching.

Steve G3TXQ

On 22/03/2011 16:02, Dr. Gerald N. Johnson wrote:
> If the DDS setting was independent of the readout in the radio it
> wouldn't take into account differences between the crystals where some
> bands are offset from even MHz to cut down on receive birdies. That
> means accuracy is dependent on the accuracy of the offset programming
> and the display counter clock yet.
> 73, Jerry, K0CQ
> On 3/22/2011 2:50 AM, Steve Hunt wrote:
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