Well... after some more experimenting, I found that the mod had a loud spur at
the carrier osc freq of 9.000 MHz. Which makes sense... it's so close to 10.1
MHz that it probably slips through the filters. So I put an LC trap in place
and that knocked it well down. The bummer is that the "no tune" mod
is now a tune mod. I had to include a trimmer cap to get it exactly on 9.000.
So anyway, I will include this on the Tentec Wiki page (eventually - working on
that page when I have time!).
http://tentecwiki.org/doku.php?id=omni30mmod
-Tom N1OOQ
>There was once a kit available from Tentec for this, now long gone. WB5JNC
and I have been bouncing ideas around on this subject for a couple of months. I
finally implemented some of them and modded my Omni D for 10 MHz transmit last
week. (Yes - this is the same Omni that quits on me after an hour or so!) I
have started writing up the mod at the Tentec Wiki, keep an eye on this
page:http://tentecwiki.org/doku.php?id=omni30mmodI have only had time to make a
couple of QSOs on 30m so far, but signal reports were good. As far as I can
tell without a spectrum analyzer, the output is clean. I listened for likely
spurs with a general coverage RX, and the ones that were there were weak, with
the receiver sitting basically right under the antenna. Power output is
consistent with the bands surrounding it - that is, 20m and 40m. My Omni is a
little bit lower-powered on those lower bands, higher on 15m and 10m.-Tom
N1OOQ> Perhaps one of you old time TENTEC gurus that lived
through the birthcycle of this rig can help me. It is a Model 545 S/N
0025 . Early production . The front panel has a 10.0 Mhz position on it , but
there is noapparent circuitry in the radio for generating output on that
band. Is there someone aboard the net here , that can advise me of sourcesfor
obtaining materials / info / tips / etc on executing the necessarysteps to take
to get this rig fired up on 30 Meters. Thanks to anyone who can offer help
, in advance. 73 Dave W1DWZ
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