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Old March 19th 06, 09:47 PM posted to rec.radio.amateur.antenna
 
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Default Current through coils

Yuri Blanarovich wrote:
wrote

This long painful thread (it's been going on years now) started because
K3BU claimed a loading inductor had most of the current in the first
few turns.


I am back after loooong absence here and see more misinformation coming from
Tom, W8JI.

I claimed that current in the antenna coil is NOT CONSTANT (or near) as he
claimed.
The case was of electrical quarter wave vertical radiator (as loaded mobile
antenna) and that the current is distributed, varying across the coil as I
have experienced, W9UCW has measured and Cecil has explained.


Yuri,

Why don't you explain in a few words how you think the loading coil
works?

Also, why do you think a mobile antenna is "90 degrees long" when it
has a loading coil?

The loading coil, if well-designed and of compact size, doesn't have to
have any significant current taper. The exception would be if the
antenna above the coil has small capacitance compared to distributed
capacitance from the coil to space or to ground.

Do you still disagree with this?

73 Tom

 
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