Did you try a dummy load? That's always my go-to sanity check when I
have any kind of an RF concern.
John W5TWO (KPA1500, KPA/KAT500, etc.)
On 4/18/2025 11:00 AM, elecraft-requ...@mailman.qth.net wrote:
Message: 1
Date: Wed, 16 Apr 2025 14:01:11 -0400
From:phi...@comcast.net
To:Elecraft@mailman.qth.net
Subject: [Elecraft] Intermittent low output KPA500
Message-ID:<8765654b-73fd-4298-ab39-500cf3445...@comcast.net>
Content-Type: text/plain; charset=utf-8
In the last few days I have noticed that when operating FT8 using my
KAT500/KPA500 combo with an IC-7610, my output seems low on the first or second
transmit cycles after switching bands. If I am chasing DX I usually run about
120 to 160 Watts, which is about 6 to 8 Watts on the transmitter. I am seeing
only 50 or 60 Watts on the amp when I first transmit. After a couple cycles it
goes to the higher output and is stable after that.
When changing bands, I switch the radio, with the amp in Standby, then switch
bands on the amp before transmitting. Sometimes I use Tune in WSJT-X running
just a few watts with the amp in Standby for the amp to automatically switch
bands. My antennas have low SWR on most bands, so the tuner is often in Bypass.
This seems to have just started and most often occurs on 20 Meters using a GAP
20 Meter Mono-band.
I also run CW and some SSB but don?t notice the power meter as much as on FT8.
I don?t thing it?s happening there.
Has anyone seen this or a similar problem?
Phil N3ZP
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