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Old July 19th 06, 07:14 PM posted to rec.radio.amateur.homebrew
Joel Kolstad Joel Kolstad is offline
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First recorded activity by RadioBanter: Jul 2006
Posts: 102
Default What is a wire antenna's impedance? -followup

Hi Andy,

"AndyS" wrote in message
ups.com...
Now, if the counterpoise was at infinity, the Efield must always be
zero,
since any voltage divided by infinity ( to give V/M) will be zero.


If I take a charged sphere with 1V applied, the E field falls off as 1/R all
the way out to infinity; it is only there that it's actually zero, yes?

If you know of an antenna that has no counterpoise for the "hot"
side to
work against, please post some information about it......


How about a half-wave antenna (end-fed zepp)? Assuming it's being fed by
coax, would you suggest the counterpoise is the ring making up the shield of
the coax right where the coax stops and the antenna starts?

I would like to hear from someone like Roy as well, since I certainly am
well outside of any areas of significant experience here.

---Joel