[Elecraft] HI CUR warning on K3

[Jim Brown]

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