Almost forgot to tell you, Mark...
The Omni-D (actually any of the old, black Omni rigs) will not operate
properly on 17 meters (the 18 MHz band). This is because various mixer
products produce spurious output on that band. Remember that the 9 MHz IF's
second harmonic is 18 MHz, but this is not the only source of the trouble.
The Omni's do work well on 10 and 24 MHz, however.
73, Mike N4NT
----- Original Message -----
From: "W1EOF" <w1eof@hamnutz.com>
To: <tentec@contesting.com>
Sent: Sunday, January 25, 2004 7:01 PM
Subject: [TenTec] Omni-D ALC
> Hi All -
>
> Just joined this list last week. Glad to see so much activity on it.
>
> I have had an OMNI-D for about 10 years now. I've really enjoyed using it.
> There is one thing about it's operation that has bothered me though:
>
> When you are adjusting the drive control so that the ALC kicks in/out the
> OMNI will oscillate, making a "groan" kind of sound in the sidetone. From
a
> design point of view I've always wondered if it was lacking hysteresis in
> the ALC. It does this one some bands more than others.
>
> Is this normal operation? If not, has anybody else had a similiar problem?
>
> I've just worked around it all these years. However I'm about to open it
up
> to install the WARC kit and thought that it would be a good time to look
> into that ALC circuit too.
>
> 73,
>
> Mark W1EOF
>
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