On 11/8/2023 8:21 AM, Pete Smith N4ZR wrote:
I've fairly well established that the problem is not at the antenna, but
arising somewhere in the grounding/RFI protection in my station, since
it occurs only on one band and (more importantly) because it stopped
totally after I re-tightened all the connections in my grounding system
yesterday
That can certainly be a major cause of problems with RF in the shack.
The Carolina Windom incorporates a line isolator 22 feet down from the
feedpoint, but technical questions have been raised about exactly what
you describe, and I'm not technical enough either to question the
analysis or to experimentally measure the common mode current on the
feedline.
ALL off-center-fed antennas are a train wreck for RF in the shack, and
for blowing "line isolators" and chokes. This is because their strong
imbalance puts huge common mode current on the feedline. They are a very
bad idea, especially if running high power. Anything done to try to
"fix" them is putting lipstick on a pig.
73, Jim K9YC
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