"Cecil Moore" wrote in message
...
Jimmie wrote:
What, Coililng the wire has nothing to do with how well it does or does
not
radiate, only with how the radiation is summed into the total field. The
current distribution in a loading coil should be very similar to the
current
distribution in the secton of antenna it is replacing.

Actually, coiling the wire tends to reduce the far-field radiation
because much of the near-field(s) cancel each other. The currents
on each side of the coil are traveling the opposite direction in
much the same way they do in a transmission line. However, that
doesn't mean the currents at the bottom and top of the coil are
identical. The magnitude of the total current at the bottom and
top of the coil depends in large amount on the phase shift through
the coil.
--
73, Cecil http://www.qsl.net/w5dxp


Just because it is canceld in the far field does not mean the coil did not
radiate. I would not even say it is canceled in the far field although this
is a convenent way of looking at radiation. All you can really say for sure
is that the out of phase voltages in the receiving antenna combine
destructively.

----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet
News==----
http://www.newsfeeds.com The #1 Newsgroup Service in the World! 100,000
Newsgroups
---= East/West-Coast Server Farms - Total Privacy via Encryption =---