From your description, something in the antenna system, coax,
connector, balun, antenna is heating and changing value. I doubt it is
the radio, or the amplifier, or the tuner.
That antenna is rated at 250 watts PEP. Sure bet you are exceeding the
power rating with the KPA500 running.
73
Bob, K4TAX
On 1/13/2024 3:58 PM, elecraft-requ...@mailman.qth.net wrote:
Message: 5
Date: Fri, 12 Jan 2024 23:28:09 -0600
From: "Michael Reynolds, NO6O"<mich...@no6o.com>
To:elecraft@mailman.qth.net
Subject: Re: [Elecraft] KAT 500 Loses Match
Message-ID:<fc07b444-9571-47e7-9629-846473012...@no6o.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
Greetings,
I joined this list today, after sending a message to Elecraft support,
describing a similar problem.? I have an Icom IC-7610, with the KPA500
and KAT500, and my SWR spontaneously climbs into the red sometimes
during transmissions.? It takes some effort to correct it, and I
typically lose a QSO in the process.? The relays go nuts trying to
re-tune, and sometimes produces a fault condition. Usually, I can
correct it by restarting both the amplifier and tuner.? I have a Comet
CHA-250HD, which has a almost a flat 1.1 SWR from 80m to 6m.? I don't
need a tuner while barefoot.? However, when I first hooked up the
KPA500, the SWR was not flat, and added the KAT500 this week, which led
to my SWR issue.
I hope the cause and resolution can be determined.
Michael
NO6O
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