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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