Posted by
Lyn WØLEN on
Apr 10, 2020; 5:57pm
URL: http://elecraft.85.s1.nabble.com/KPA-500-tp7659606p7659625.html
Many thanks to all who offered me solutions both on and off the list.
But let me clarify ... I wasn't looking for help. My system and my station
are performing very well, and I love it.
I was merely offering up my experience in response to Alan, G4GNX's question
(below).
73
Lyn, WØLEN
-----Original Message-----
From: Lyn Norstad [mailto:
[hidden email]]
Sent: Friday, April 10, 2020 8:59 AM
To: 'Alan - G4GNX'; 'Elecraft Reflector'
Subject: RE: [Elecraft] KPA 500
At 100w on 20m, my KAT500 Utility shows an SWR of 1.00 with the KPA500 on
Standby and temp around 38ºC. But as I switch the KPA to Operate and
increase the power to 300w the SWR goes up as high as 1.10. If I hold it
there (key down) long enough the KPA temp starts rising slowly. At about
50ºC I can hear the fan picking up speed. By the time I get to 60ºC the fan
is at probably level 2 or 3. SWR is still at 1.10 (max).
Right or wrong, I've always assumed there is some slight heating in the
antenna system (Tuner, Balun, Lightning protection) although all components
after the tuner are rated at 5 KW.
73
Lyn, WØLEN
-----Original Message-----
From:
[hidden email]
[mailto:
[hidden email]] On Behalf Of Alan - G4GNX
Sent: Friday, April 10, 2020 6:27 AM
To: Elecraft Reflector
Subject: [Elecraft] KPA 500
I have a strange fault a couple of times recently, where the SWR starts
to increase during the time of a single 'over'. I've been using the K3S
set at 100W out, via the KPA500 (in standby) and the KAT500 tuner,
without any problem, but after I've switched the linear to Operate and
driving it to 200W, the SWR creeps up. I don't think it's an antenna
issue, but a possible heat problem with the KPA500. I watched the
temperature display on the KPA500 and initially on Standby it shows
about 38 degrees C. After transmitting at 200W the temperature slowly
rises above 60 degrees C, but the fan doesn't cut in. Does anyone know
if this is normal behavior and what temperatures I should expect to see?
I have tested the fan via the Menu function and it works as expected.
73,
Alan. G4GNX
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