[Elecraft] K-2 /100 Power Output Drop

[Alexey Kats]

Out of curiosity, is it only happening with power set to >10 watts?
(If it is happening in QRP mode as well something must be wrong with
your main RF board and its PA, but if it's only happening in QRO mode
it's the KPA100 at fault. I think.)

On Fri, Jul 16, 2010 at 2:45 PM, Alexey Kats <alexeykats at gmail.com> wrote:
> It sounds like half of your PA shuts down somewhere close to the final
> stage transistors. Could it be a bad soldered connection somewhere
> which loses connection after brief warm-up? Or a partially stripped
> wire in one of symmetric transformers? I'd start with checking all the
> connections around PA transistors in final stage. (I had similar
> experience with a powerful AF amplifier long time ago, but there was
> another hint - audio was badly distorted.)
>
> --
> Alexey Kats (neko)
>
> On Fri, Jul 16, 2010 at 1:50 PM, Dennis Utley - AF7Y <af7y2003 at yahoo.com> wrote:
>>
>> First the good news.  The receiver seems to be working well, even transmit
>> power is
>> at a full 100 watts (for a few seconds).  Then output drops quickly
>> to 50 watts.  Thats the bad news.
>
>> If I turn the radio off and wait a few moments.  It will again output
>> full 100 watts peak SSB output for a few seconds then drop to 50%.
>



-- 
Alexey Kats (neko)