Re: KPA 500
Posted by
Don Wilhelm on
Apr 10, 2020; 3:22pm
URL: http://elecraft.85.s1.nabble.com/KPA-500-tp7659606p7659612.html
Alan,
That does sound like an antenna problem - balun heating, a loose or bad
connection somewhere.
Try that same test into a dummy load - if it shows the same behavior,
then you can blame the KPA500, but if not blame the antenna system.
73,
Don W3FPR
On 4/10/2020 7:26 AM, Alan - G4GNX wrote:
>
> 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.
>
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