[Elecraft] Sudden KpA1500 power reduction

[rocketnj at gmail.com]

Just my guess is one of the LDMOS devices let out the magic smoke? 
Just a thought...

Dave wo2x


-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On
Behalf Of Dana Roode K6NR
Sent: Saturday, February 20, 2021 9:16 PM
To: Elecraft Reflector <Elecraft at mailman.qth.net>
Subject: [Elecraft] Sudden KpA1500 power reduction

I'm in the ARRL CW contest this weekend and the KPA1500 has been working
fine.  However, a few minutes ago I noticed I was getting about half the
output power on 20 meters that I typically get with around 30 watts drive
(about 600w vs 1200w).  PA current is less than normal, around 30a.
Similar problem on the higher bands, I can no longer get 1000w.  On 40m I
can, but it requires more drive.

Seems like something died in the amp; I'm not familiar with the design, but
perhaps an output module.  No errors or ill behavior from the amp other than
the loss of power.

I will contact Elecraft support unless there is something I'm missing here.
I just looked in the archive and see that this has happened to others....  I
use the amp remotely so I guess I'll have to take it home with me.

  Dana
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