KPA1500 in IARU Contest last Weekend

[Elecraft mailing list]

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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[Igor Sokolov-2]

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
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

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