You do realize that if the common-mode current on the line is due to asymmetry
between the antenna and the line, then choking at the feed-point reduces the CM
current at that point, but just like your example said, a quarter wave *down*
the line you have a CM peak. If asymmetry isn't an issue then open wire is just
fine with a balun at the tuner and I say this while not being a fan of open wire
fed antennas.
I'm also somewhat bemused by the cottage industry that's sprung up in the last
few years to calm the hand wringing about common mode current. I think there's
been a lot of development of cures that are looking for ailments. In my
curmudgeonly opinion of course :-)
Wes N7WS
, On 1/13/2019 10:24 PM, Jim Brown wrote:
WHERE are you measuring it? You do realize that, like any antenna, current
varies along the wires that make up the antenna. A choke attempts to force the
current to zero AT THE POINT WHERE THE CHOKE IS PLACED. You're putting it at
the tuner, so it forces current to zero there. But a quarter wave up the
feedline, the current reaches a maximum value.
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