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
On 2024-01-12 10:36 PM, Bill Johnson wrote:
Good advice
Bill
K9YEQ
________________________________
From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> on behalf
of Ken WA8JXM <wa8...@gmail.com>
Sent: Friday, January 12, 2024 5:52:52 PM
To: elecraft@mailman.qth.net <elecraft@mailman.qth.net>
Subject: Re: [Elecraft] KAT 500 Loses Match
It's possible that something is arcing and, of course changing the tuning.
Do you have the internal tuner in the K4? If so, does it behave the
same way?
Why do you have the amplifier running? 30m is as restricted power band.
If you leave the amp and tuner out of the circuit and transmit with the
K4 directly, does the SWR meter stay steady, or does it fluctuate at
full power?
Ken WA8JXM
Why is the amplifier connected? 30m is a restricted powerband.
On 1/12/2024 4:46 PM, Paul Ecker wrote:
I am experiencing a new problem for me, with my KAT 500. So far I've
noticed this issue on 30M. I am using a dipole cut only for 30M with an SWR
of 1.2 to 1.3 max SWR across the band. I “trained the tuner” at 20khz
segments on 30M.
Setup is K4D, KAT 500 & KPA 500. Win 10 pc.
Running CW, I can start transmitting and all is fine- my LP100A is showing
1.2 SWR and am getting max power out of the radio. Then all of sudden the
SWR jumps to >9.0. The KAT starts chattering and finds a new match. But if
I start transmitting again – pwr out is only about 10 W at that new match,
and eventually the tuner becomes untuned again. Sometimes, it will then
hold the tune but still only getting abt 9-10w power out. The issue occurs
with KPA500 both on and off.
Does this sound like a KAT 500 problem or maybe an RFI problem.
73 Paul
w2eck
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