Boy do I feel embarassed. Read your message, looked at connections, all
OK. Then transmitted again to see if I could note anything more. Noted
that the ALC control was at 12 o'clock instead of 3 o'clock. Readjusted
ALC and drive and the problem seems to have gone away. Will advise if
it comes back.
Thanks all for the replies
73 de N0VYY Loren
Michael O. Hyder wrote:
> I am assuming you have checked any and all coax jumpers in your shack from
> antenna switches to tuners, etc. Then check antenna output connector on
> Omni. Don't mean to treat you like a dunce, and am sure you did all this.
> Let me tell you what I ran into. On my Omni-C, the diodes which generate
> the ALC voltage (maybe they are on the SWR-TR board, but I am not sure) went
> south. When my Omni-C did not have the ALC voltage, turning up the drive
> control past a certain point would put the rig into a self-oscillation.
> Replacing the diodes fixed the problem for me. That is an esoteric
> possibility (my specialty) from my experience. That might well explain the
> problem you are having. I sure hope it does. Please advise what you find
> so that all of us can benefit from your findings. 73
> Regards, N4NT@bigfoot.com
> Mike Hyder
> 401 E Holston Ave
> Johnson City, TN 37601-4009
> (423) 232-6453
> -----Original Message-----
> From: Loren Willis <firstname.lastname@example.org>
> To: email@example.com <firstname.lastname@example.org>
> Date: Monday, April 20, 1998 12:11 AM
> Subject: [TenTec] Problems with OmniD (mod B)
> >Suddenly noticed poor behavior on the part of my OmniD (546) model B.
> >On at least half the transmissions, between 10 and 20 seconds into the
> >transmission, the SWR meter jumps to show an ratio of 10-1(from under
> >2-1), and a 60 cycle hum starts coming out of the power supply.
> >Receiving stations report a terrible drop off in signal.
> >The problem does not seem to be antenna related as it effects both my
> >vertical and my dipole. The dipole is fed with ladder line, and the
> >vertical has brand new coax, so feed line contamination seems doubtful.
> >Any ideas of where I should start looking?
> >73 de N0VYY
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