[Elecraft] KPA-500 No Power out on 80 meters
Dr. William J. Schmidt
bill at wjschmidt.com
Sun Mar 31 17:52:02 EDT 2019
This happened to me too on 40 meters with an antenna that was less than 2:1
SWR. There are a lot of factors that can impact the longevity of the parts
in the amp... over voltage/ over current can happen depending on the
components of the impedance.
-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Tom KG3V
Sent: Sunday, March 31, 2019 2:30 PM
To: elecraft at mailman.qth.net
Subject: [Elecraft] KPA-500 No Power out on 80 meters
I believe I have fried the 80 meter circuitry in my KPA-500. I am contacting
Elecraft about possible repairs, but would also be interested in other's
input. Here is what happened:
I was using a multi-band antenna and the SWR was high on 80m. I use a
KAT-500 with the Amp at all times. My (naive) thinking was that if the
KAT-500 could successfully tune it, the Amp was safe. In the past, this
seemed to have been the case. I use an IC-7600 and have the KEY line
connected, as well as the PA KEY line between the Tuner and the Amp.
Every time I changed frequencies on the 80 meter Band, I would TUNE before
operating. At one point, I noticed "that smell" of hot components, and was
then unable to transmit on 80 meters.
In testing this morning, I get no output from the Amp on 80 meters only.
All other Bands seem to be fine. I can use 80 meters with the Amp in Bypass
mode, so I do not suspect a problem with the Tuner. Today, it continues to
work fine on several other bands with full power output.
Thanks for any suggestions
73,
Tom, KG3V
--
Get on the Air and make some noise
Ham Blog at WWW.KG3V.COM
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