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TOPIC: power output on 160 m sudenly went to half power

power output on 160 m sudenly went to half power 15 Jan 2019 21:41 #1

:unknown:
I was fine tuning the antenna swr a little bit at full pwr in tune abt 19 watts or so it was 1.7swr
under adjustment went down to 1.3 but pwr decreased. adjusted a little more.down to1.2 swr.
when power suddenly went to under 10 w.
the whole operation took abt 1.5 minutes or so.
connected dummy load than showing only 12.5 w.
all other bands ok!
checked everything and changed antenna port from a2 to a3...still the same result!
Just 12.5 W max output on 160 all other bands including 60 M abt 20 W.
Any ideas what has happened ?

Best Regards Rune SM3MZY
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