Hi,
The amp has worked well with 500 watts out, and in standby works fine with 100
watts and the power shown on the led meter is correct. When in operate, it
shows high swr with only 1 or 2 watts of drive. So something in the t/r switch
has failed.
I guess.
Thanks for the reply.
Chuck, KE9UW
Sent from my iPad
On Mar 14, 2012, at 1:11 PM, mkoeh...@comcast.net mkoeh...@comcast.net
wrote:
Chuck - I'm a brand new KPA500 owner ...so don't have a lot of history.
Probably not this simple, but I would suggest looking closely at the
clearance between the center pin of the high power output connector and that
metal shield. I thought the design was exceptional but was disappointed at
how there was almost no clearance here. (If I had a Greenlee punch, I would
have taken a nibble out to provide more clearance!) It's possible when you
kick into high power, it could arc/short or have a bad VSWR. Also, have all
the cables on the output side been run 500W+ before?? 73- Mark WA3OFR
Sent via BlackBerry by ATT
-Original Message-
From: ke9uw c-haw...@illinois.edu
Date: Wed, 14 Mar 2012 06:37:06
To: elecraft@mailman.qth.net
Subject: [Elecraft] KPA has FAILED...high SWR reported by K3 when amp in
Operate
My KPA500 causes a high SWR showing at the K3 when the amp is in transmit
operate. All else seems to work ok...reloaded firmware...checked
faults...something about power lost without controlled shutdown.
Any ideas? Pin diode?
-
Chuck, KE9UW
--
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