[Elecraft] Vetical Antennas

[Don Wilhelm]

I agree with Kieth wholeheartedly.  SWR on the feedline does NOT cause
feedline radiation - ever.

The thing that causes feedline radiation is common mode currents - most
commonly observed as current flowing on the outside of a coax line.
Properly placed current baluns can eliminate common mode current, but should
not change the SWR,

73,
Don W3FPR

> -----Original Message-----
>
> -----Original Message-----
> Attempting to compensate for large mismatches with an ATU at the tx end
> of the feeder may result in an apparently good match, but will in most
> cases cause the feeder to radiate.
>
> Exceptions to this are when the feeder is of the balanced variety, eg.
> open wire, where the feeder carries a 'balanced' standing wave as a
> matter of course.
> ---------------------------
>
> Actually I believe this is one of the great myths of amateur radio.
> Standing waves on the feedline do not create feedline radiation.  What
> standing waves do is to increase the loss in the feedline.  Open wire
> feeder is used to reduce feedline loss.
>
> - Keith N1AS -
> - K2 5411.ssb.100 -
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