RadioBanter - View Single Post

April 3rd 06, 02:31 AM posted to rec.radio.amateur.antenna

wrote:
If the loading coil is physically large and has a good amount of
displacement current flowing radially to space and objects around the
antenna compared to through current, the coil would have a noticable
difference in current at the bottom terminal and top terminal.

How does one amp at the top and zero amps at the bottom grab you?
Please see my other postings.

It's only when the coil becomes physically large and has appreciable
capacitive reactance to the outside world compared to the load
impedance that it starts to show significant transmission line effects.

Which is certainly the case for a 75m bugcatcher coil.

Every bit of this is not difficult to understand if we really
understand how an antenna behaves and how a coil behaves. The only
source of wonderment and argument seems to come from people who want to
make the inductor behave differently in an antenna than it behaves in
other systems.

The 75m bugcatcher coil certainly behaves differently mounted
one foot above a GMC pickup ground plane than it behaves in
free space. The question is: which is more common? A GMC pickup
or free space?

There is no reason to assign
special properties to an inductor and make it behave differently in an
antenna than it does in other systems.

There is no reason to assume an inductor behaves differently
above a GMC truck ground plane than it behaves in free space???
Tom, would you please describe the free space that exists inside
your head?
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73, Cecil http://www.qsl.net/w5dxp