It is likely RF traveling into the amp via multiple wires, cables.
Recommend you put RFI cores on the coax between the radio and amp, and
on the antenna coax near the amp.
( also possible getting on power supply connections)
73Bruce-K1FZ
-----------------------------------------From: "WW3S"
To: "topband@contesting.com"
Cc:
Sent: Friday October 29 2021 10:44:39AM
Subject: Topband: amp tripping on 160
After two great nights of being able to receive, I am beyond
frustrated,
as I cannot transmit....something happened recently, and I cannot
figure
it out... I suspect its RFI, but not sure why.....as soon as I
transmit
on my Inverted L, my SPE 1.3KFA amp trips, saying SWRT exceeds
limits.....yet the SWR displayed is 1.46 to 1......new to me, but not
new to this season is my tower which holds my Inverted L.....it was
50'
of Rohn 25, with a Hazer, its now a Alumnatower 48', with a
wonderpole.......but.....that setup did work, as I worked S9OK and
3DA0RU with it....I added a second receiving loop in the front yard,
so
thought that was it, but I took those cables out from the shack and
still have a problem.....yesterday morning, I found the short piece
of
coax had a nick in it, from the mower I guess, so replaced it, and
shortened my L a bit to bring the SWR a bit further up the band.....I
tested yesterday morning and it was great, low , mid and high power,
even 1300 watts of RTTY, no failure, I tried several times during the
day and all was great until darkness, and as soon as I keyed the amp,
failure.....I pulled out what little I have left of my hair trying to
figure this out......the wonderpole is grounded and I "assume" the
tower
is grounded thru that......should I separately ground the tower?
Doing
so will complicate tilting it over, plus I only have copper grounding
attachments, I thought I read where I shouldn't use dissimilar
metals.....but willing to try anything to get my 160 TX ability
back...thoughts?
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