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Re: [TenTec] OMNI VI product detector IMD

To: <tentec@contesting.com>
Subject: Re: [TenTec] OMNI VI product detector IMD
From: "Steve N4LQ" <n4lq@iglou.com>
Reply-to: tentec@contesting.com
Date: Mon, 17 Jan 2005 10:16:41 -0500
List-post: <mailto:tentec@contesting.com>
Clark:
I have the manuals for both the VI and VI+ and have compared the IF/AF board component values fwiw.
The only one that stands out it C6. From the VI to VI+, C6 goes from 1,000pf to 2200pf.


R31 from 33k to 100k, R44 eliminated, R45 eliminated.

Steve N4LQ
----- Original Message ----- From: "Clark Savage Turner" <csturner@kcbx.net>
To: <tentec@contesting.com>
Sent: Monday, January 17, 2005 12:42 AM
Subject: [TenTec] OMNI VI product detector IMD



Hey all -

Anyone with an early OMNI VI do the Ten Tec modification to improve the in-passband performance of the product detector? I do not mean the 2nd order IMD mod that is done on the RF board (I have done this one and it does not help).

If you have a fairly early OMNI VI, check with 2 stations in the passband with S9 or so, see if you can hear the beat note. G4PKT produced a daughterboard product detector to cure the problem and Ten Tec did a fix for later OMNI's to take care of this problem.

I spoke to Ten Tec and got some instructions to add two caps to the IF/AF board, I did what was suggested and got no improvement. I'll call back to see if I have it correct, but just wonder if anyone has taken care of this and knows exactly what the remedy is. I have the G4PKT board but would rather not install it if the Ten Tec remedy is sufficient.

Clark
WA3JPG

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