Re: Station weirdness

Ron Bosch

Rick and Jerry,
" Good luck and hope you find your problem and fix it easily."
Any insight on how to make those two go together would be greatly appreciated :-)  I seem to do well on the first, but miserably on the second!!  Glad to see that I am not the only one who has the weird and strange happen to them, although most of mine as a newby, seem to be self-inflicted right now :-).  Latest learnings:
1.  When you tune a 10M dipole on 80M it is really hard to get much signal out :-)
2.  An MFJ-939I is an amazing autotuner that I am pretty sure could tune my truck's satellite stub to 80M!
3.  Label your antenna switches!

The mystery right now is that I seem to have problem with my 132' end fed zepp on 40M, I can tune it flat, and the match shows good, but when I get above about 35 watts out, it starts tripping the self-protection on the IC-7100 and reducing power, but not to a regular level like it would if it were a steady high SWR, it kinda jumps, lowers power SWR goes down, radio kicks power-up, and the cycle begins again.  It tunes fine and I can get 100 watts to the tuner in on every other band, so I suspect I am getting some weird resonance bridge as I increase power, but it is definitely power dependant, since at about 35 watts it goes away completely.
My first kick at the cat is I plan to extend the end fed to 202.5 feet, which I think I can do in the space I have.  The other monkey in the wrench is that is is only about 10 feet high because the Neighbourhood Nazi's would crucify me if they knew I was operating an HF station here.  I already tried changing the length of the counterpoise, with no discernable effect.

Judging by personal experience, the next public health crisis after COVID 19 is likely to be cirrhosis.
Ron Bosch

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On Wed, Aug 5, 2020 at 4:09 PM Rick - N7WE <n7we1980@...> wrote:
I had something similar happen last week.  Sudden hi SWR on all bands.  Grabbed the MFJ 259B and started working backwards from the vertical.  That was about 9 AM and the heat index was already near 100.  The antenna checked OK.  Jumper to the bulkhead fitting checked OK.  Fitting itself checked OK.  But when I got to the main coax on the other side of the bulkhead fitting, the waterproofing was split and the PL259 wasn't even finger tight.  Now the waterproofing was 2 layers of self-bonding silicone tape covered with a double wrap of 3M Scotch33.  It had simply split - from the heat, humidity, and UV I guess.  First time I've seen that in many years of using that waterproofing technique.  And that wrap as new about 20 months ago.  After it split, I guess the PL259 just worked loose from expansion/contraction in our lovely summer.  Tightened it back, rewrapped with 2 layers of silicone tape, 2 layers of 3M Scotch33, and everything is back in normal range.  Took about 2 hours with several water and "go inside and cool down" breaks.  Someone once told me that 95% of all electronic faults are in connections!  In my instance they were right.  Good luck and hope you find your problem and fix it easily.
Rick - N7WE
070 - #1602

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