*My last post was in addition to what Bob/K4TAX advised about the Bypass
Capacitors. Sorry, should have made that clear in my original post......*
*
Wade/KJ4WS*
On Wed, Oct 8, 2014 at 10:39 PM, Wade Staggs <tvman1954@gmail.com> wrote:
> *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@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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>> TenTec@contesting.com
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>>
>
>
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