Mark-
You might call Ten Tec Service and talk to Don Prouty. Someone had told
me awhile back that he had described to them where to add bypass
capacitors to fix distorted audio on 12m.
I also have distorted transmit audio on 12m. I saw Don at Dayton last
week and asked him how to fix the problem. He suggested that since my
problem was transmit only, I need a better ground or a 12m counterpoise.
He also said that if the problem were on both transmit and receive, he
could suggest some mods to the transceiver. That sounds like your
problem. Good luck.
Jim N4AL
Mark Erbaugh wrote:
> My Omni VI option 3 upgrade has developed symptoms of RF feedback. I got a
> report of RF in my transmitted audio. I'm also hearing muffled audio in the
> speaker or headphones when transmitting. I get this problem even when
> transmitting into a dummy load. The muffled audio in the speaker seems
> pretty much the same whether I'm on 75m or 10m.
>
> My Pegasus is sitting next to the Omni VI. I moved all the cabling from the
> Omni VI to the Pegasus. The Pegasus doesn't appear to have the RF feedback
> problem.
>
> My ground isn't ideal. I have about 15 feet of RG8 coax braid going to the
> copper ground wire that runs from the electrical panel to grounding rods
> (2). There is about 8 feet from where the braid joins the ground wire to the
> ground rod. So I guess my total length to ground is about 23 feet.
>
> I do plan on shortening the path to ground and using heavier wire, but
> that's going to require drilling through the poured walls of my basement.
> The two ground rods for the electrical system are just outside the wall of
> my shack (about 6 feet apart). By drilling through the basement wall, I
> should be able to get the total length to the first ground rod down to six
> feet or so. Is it likely that a third ground rod for the shack (but
> connected to the other two) would help?
>
> Any ideas?
>
> Thanks,
> Mark
>
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