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Old May 4th 09, 07:03 PM posted to rec.radio.amateur.antenna
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Posts: 274
Default Dual-Z0 Stubs

John KD5YI wrote:
"Cecil Moore" wrote in message
...
John KD5YI wrote:
"Cecil Moore" wrote in message
A 75m Texas Bugcatcher loading coil certainly
qualifies as a distributed load being about
1/8WL long.
A 75m Texas Bugcatcher loading coil is about 30 feet long?

*Electrically*, yes. Its velocity factor calculates
out to be about 0.02 at 4 MHz and it is physically
0.563 feet long. 0.563'/0.02 = ~28 feet.

At 4 MHz, a 75m Texas Bugcatcher coil replaces ~28 feet
of wire in the antenna. That is ~41 degrees at 4 MHz.
(Note there is about 44 feet of wire in a 75m Texas
Bugcatcher loading coil.)



Using your argument, I could buy an inductor wound on a toroid core and
claim it is a "distributed" component because it "electrically" replaces
some calculated "degrees" or "feet" of wire at some frequency.

You appear to be trying to make lumped components into distributed
components to suit your arguments. Shame on you.

John



It could be worse, John. He could claim that his loading coil replaces
a certain amount of period (time) in addition to length. That might be
too complex for him, though.
73,
Tom Donaly, KA6RUH
 
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