On 5/6/06, Randy Russe3ll <lord_russell53@yahoo.com> wrote:
>
> ... I guess when you have a 1 ft. wide sheet
> of copper for RF useage, it has the same useable
> conducting area as if you rolled that one foot
> circumference into about 4" inches wide. So it is
> effectively the same RF conductor as a 4" dia. piece
> of copper wire, yes? with lower inductance? Since RF
> only utilizes the surface of a wire conductor.
Yes, a 4" tube of copper flashing is the same at RF as a 4" solid rod,
because of skin effect. But a 12" flat strap is probably twice as good
(half the impedance), because current flows on both sides. No RF current
flows on the inside of the tube.
On the other hand, a 4" bar is a lot less likely to explode or blow away!
73 Martin AA6E
--
martin.ewing@gmail.com - AA6E@arrl.net
President, Yale University Amateur Radio Club - W1YU
http://blog.aa6e.net
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