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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