Topband: CF Antenna

[Tom Rauch]

Hi Jerry,

I'll make one more post on this fantasy....I mean topic.
 
Capture area, or effective aperture, is often misapplied. Contrary to 
popular ham-lore, capture area is totally independent of an 
antenna's physical size. Capture area, or more correctly effective 
aperture, relates only to antenna gain. You can find that clearly 
defined in engineering textbooks, like Antennas by John Kraus.

But you are correct, the effective aperture of an antenna like the 
CFA is very small. That's because it is impossible to make the 
antenna efficient and/or directive enough to have gain.

There is one capture area effect of this antenna that amazes me.   

I'm amazed so much attention is captured by a fantasy.

By the way, the CFA article author in Antenna X claimed....

1.) He invented the MFJ loop antenna. He had absolutely nothing to 
do with it.

2.) He invented part of the MFJ analyzer. He had absolutely nothing 
to do with it.

3.) He invented the small "magnetic" loop. Hertz used one in the 
1800's, and it was described in detail in engineering text in the very 
early 1900's.

Think about that.


73, Tom W8JI
w8ji@contesting.com


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