Terry,
I would be suspicious of the voltage balun, or connections in the
feedline/antenna that are breaking down with increased power. Change
the voltage balun to a good common mode choke. A 1:1 choke may work as
well or better than a 4:1.
You might also have a lot of common mode current on the 450 ohm
feedline. A common mode choke on each side of the feedline (at the
antenna) will help if that is the case.
73,
Don W3FPR
On 5/13/2017 12:07 PM, Terry Brown wrote:
I recently started using my horizontal loop that is about a full wavelength
on 80, for 20 meters. I took down my yagi as we are moving; drat! My
Horizontal Loop is at 40 ft. height and fed with 450 window line into a 4:1
voltage balun with about 15 ft. of coax to rig.
I am running 100 watts through my KXPA100. I tune a frequency in the CW
portion of 20 to about 1.2 :1 and start sending CQ. After about 3 to 4 3x3
CQ's,, the SWR goes off the charts and power drops to zero. I can retune
the antenna and the process repeats itself. 20 meters is the only band
affected.
I am wondering if I am having RF problems in that part of the 20 meter bands
This only occurs on 20 meters. The Amp is grounded, but the KX3 is not
bonded to the Amp.
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