The carrier null is on the TX audio board...that would be
page 4-39 in the Omni VI book or 4-25 in the Omni VI+ book.
The pots to adjust are R3 and R4 at the input of the opamp
U4...the balanced modulator. The page 4-37 right hand column
bottom of the first full paragraph mentions carrier
null...this would be page 4-23 in the "Plus" manual.
Chuck, KE9UW
---- Original message ----
>Date: Thu, 27 Jan 2005 20:28:55 -0500
>From: Charles Greene <cgreene@cox.net>
>Subject: [TenTec] Omni-VI 2.8 KHz filters
>To: tentec@contesting.com
>
>Hi
>
>I got the two 2.8 KHz filters for my OMNI-VI yesterday and
reviewing the
>documentation, I can't find that it says to null the
carrier again. I
>looked through the manual and I don't see anywhere you can
null the
>carrier. Did I miss it? Does the carrier null just apply
to the
>OMNI-V? I don't mind doing it, but I just can't find where
it tells you
>how to do it. The only thing I found in the manual is
setting the
>frequency for the PBT control, which might be a good idea
to do. I have an
>OMNI-VI purchased in 1994 with the + mod done by Ten-Tec.
>
>I also ordered the 600 Hz roofing filter, but they said it
wouldn't be
>shipped until March. Inrad did give me a 5% discount for
buying 3 filters :-)
>
>I am planning install the Inrad 2.8 KHz 6.3 MHz filter in
place of the 2.4
>KHz "standard" filter, move the 2.4 KHz filter to the 1.8
KHz filter
>position, move the 1.8 KHz filter to the .5 KHz position,
leave the .25 KHz
>filter in place and relabel the filter switches. When
done, I will have
>three different 6.3 KHz SSB filters: 2.8, 2.4 and 1.8 KHz.
I don't see
>anything on the schematic that would keep this arrangement
from
>working. With the 600 Hz roofing filter, I plan to have it
activated by
>either the NR1 or the NR2 switch. I have a 500 Hz 9 MHz
filter in NR1 and
>a 250 Hz filter in NR2. All filters are OEM except the 2.8
KHz filters and
>the roofing filter. Comments on this arrangement?
>
>73, Chas, W1CG
>
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