Larry,
Those are the classic symptoms of a parasitic oscillation. You probably
already know this. But in any case, you need to look at suppression and low
pass (HF) filters in the rest of the path to see if you can break up the
oscillation.
73 de Gary, AA2IZ
----- Original Message -----
From: "Larry DiGioia" <listacct@longwire.com>
To: <tentec@contesting.com>
Sent: Sunday, November 27, 2005 10:30 PM
Subject: [TenTec] repairs
> OK, guys, I normally consider myself a pretty patient guy. But this is
> getting to be a bit much.
>
> I have sent my OmniVI Plus back to the factory 3 times in one year. Each
> time for (roughly) the same problem: the transmitter keeps blowing out.
> After the second time, I set myself up with the best antenna tuners that
> money can buy, just in case it was my fault. As of now, I really don't
> think it was.
>
> Each time, I am able to operate for a short time, a few hours, before
> something gives, and the transmitter is then only able to go into some
> kind of oscillation where it pegs the current meter after advancing the
> power level up past a couple of watts. This happens while slowly and
> carefully advancing the power control in preparation for tuning up.
>
> It happened again today. This time around, I was able to run 80m during
> sweepstakes a few weeks ago for several hours, and that is the only time
> I have had the radio on since getting it back. Then I tried to tune up
> on 20m this morning, and <poof>.
>
> To their credit, they have replaced many components, last time at no
> charge. But this will be the second DX season that I have missed due to
> the average 4 to 6-week turnaround on repairs - (had to use my spare
> Yaesu rig for cqww, ugh.)
>
> I really like Ten-Tec equipment, but I am rapidly losing faith. It is as
> if they are just putting band-aids on the problem, instead of actually
> fixing what is wrong. I have heard, for example, that certain parts for
> the Omni's are simply unavailable, is there any truth to that?
>
> I would really hate to become one of the rice-burner users, but what is
> my alternative? Any others with similar experiences? Any suggestions
> appreciated, thanks.
>
>
> --
> Larry N8KU
>
> w w w . l o n g w i r e . c o m
> 100% CW 100% HF
>
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>
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