[Elecraft] KPA1500 in IARU Contest last Weekend

[Igor Sokolov]

I had been using 40m 2 el EAntenna in the contest from Madeira running 
1.5KW from ACOM2000 with no issues at all. SWR was pretty stable. The 
antenna is rated for up to 10KW. There is a hairpin matching. Could it 
be that you had some loose contact there?

73, Igor UA9CDC


16.07.2020 12:56, Ray Spreadbury via Elecraft пишет:
> Lots of ideas there but I agree it is most likely a heat issue, that's why I
> quoted the max temp I saw in the KPA1500(70C).
>
> The 2-El yagi antenna is an EAntenna (Spanish design but now part of Wimo in
> Germany). I wanted to get the 40M Optibeam Moxon but it was not available
> for some months & being a bit impatient I bought this one. I now have the
> Optibeam on order as I have had previous good experience with that Company.
>
> Anyway it has a 5.6 metre boom with air spaced loading coils on the
> reflector & director. It also has a ferrite choke balun just before the
> hairpin match on the driven element. I'm confident that the coax and
> connectors are good. Which means it was most likely either the balun or the
> loading coils I guess. I never thought there was a problem on the Amp but I
> just wondered what else it might be.
>
> 73 Ray G3XLG
>
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