Re: [TenTec] OMNI VI product detector IMD

["Steve N4LQ" <n4lq@iglou.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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