[Elecraft] FW: K3/KPA500/KAT500 SWR problem

[Dr. William J. Schmidt, II]

I came to the same conclusion and built filters to clear this up too...  but
then...

I'm down on PJ4 for holiday the past two weeks operating for fun with a
portable 3 element beam (20-6) and dipoles for 80 and 40.  On Saturday night
I was on 40 meters with the amp running at probably 1.4:1 SWR on CW, saw the
tuner go into manual mode and saw a good sized thick cloud of black smoke
emit from the KPA500.  I quickly shut the amp off... but used it fine the
following nights on 20 meters and 18 meters.  Thought it might be because I
don't have a really good station ground, but can't prove that.  Guess I'll
take the amp apart when I get back to see what's burned up.  Until then I'll
just keep using it... but not on 40 and 80 meters.


Dr. William J. Schmidt - K9HZ / J68HZ/ 8P6HK/ ZF2HZ
 
Owner - Operator
Big Signal Ranch
Staunton, Illinois
 
email:  bill at wjschmidt.com

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Bill OMara
Sent: Monday, December 30, 2013 4:40 PM
To: 'Igor Sokolov'; 'Jeffrey Otterson'; elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3/KPA500/KAT500 SWR problem

I saw the problem when operating a  Multi-op contesting and the 80M OP was
running 1.5kw and the RF is induced into the 160M Phased inverted L array
and the combination of induced energy and the SWR reflected power on the
array kick the KAT500 back into a retune mode. So, either local energy on
Broadcast energy will both make this happen.

I now have built coaxial Stubs and look forward to seeing if this solves my
Local energy problem.


73 Bill   W4RM