[TenTec] Omni D issue

[Wade Staggs]

*Douglas,*
*                  My Paragon PA is very close to being the same. Several
Months back, we had an issue where the Logic Circuits would just lock up at
anything over 50 Watts. We changed the Three or Four Electrolytic
Capacitors in the PA Enclosure and cured the problem. Maybe, a bad
Capacitor in the PA Enclosure is allowing the PA to Oscillate? There is a
Ten Tec Service Bulletin that we have read in the past, which describes
this Capacitor Issue. In my case RF was getting out of the cage and causing
problems. My best advice, change them. And use Capacitors rated at 105 C
Temperature Rating .... Whither it fixes your problem of not..... This
needs to be done.*

*                                                                 73 from
Wade/KJ4WS*

On Wed, Oct 8, 2014 at 5:56 PM, Douglas via TenTec <tentec at contesting.com>
wrote:

>
> One of my Omni D's (series C) has starting having a problem...
>
> It shows up first on CW - the final current will suddenly jump up and trip
> out the supply.
> It seems to do this only over a very narrow temperature range. Cold it's
> fine, with the final amp assembly warm, it's fine.
> As I back off of drive, the behavior returns to normal at around 60 watts.
> As I push drive toward 100 watts current will jump, especially on high
> speed CW "dits" from around 16 amps to over 20 and the supply will trip
> out. As the process is repeated a few times, perhaps due to the the final
> amp assembly warming up, and then all is fine, making it hard to
> troubleshoot.
>
> Using a second Omni D with the same power supply, antenna tuner and
> antenna and all is fine.
>
> Something in the final amp breaking down at a certain temperature range??
>
> Any thoughts?
>
> 73,
>
> Doug/WA1TUT
>
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