[TenTec] OMNI VI product detector IMD
Steve N4LQ
n4lq at iglou.com
Mon Jan 17 10:16:41 EST 2005
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 at kcbx.net>
To: <tentec at 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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