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 & bein
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
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