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Old March 13th 06, 03:38 AM posted to rec.radio.amateur.antenna
Richard Harrison
 
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Default Current through coils

Jerry Martes wrote:
"I figured you realized that the HP Vector Voltmeter wasn`t capable of
providing the data needed for this discussion."

More likely necessary. It is dead simple.

You have a whip with a loading coil somewhere in the circuit under it.
The r-f energy is reflected by the open circuit at the tip of the
antenna. It must return toward the sender. There is no place else to go.

Anything feeding the antenna is in the path. Volts and amps at any and
all points along the way are acted upon by the incident and the
peflected waves. Straight wire or coil, the effect is the same as there
is a periodic variation in volts and amps due to the combination of the
effects of volts and amps from both directions.

Should the current at both terminals of a loading coil happen to be the
same, it would likely be a rare coincidence.

Best regards, Richard Harrison, KB5WZI

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Old March 13th 06, 04:06 AM posted to rec.radio.amateur.antenna
Cecil Moore
 
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Default Current through coils

Richard Harrison wrote:
Should the current at both terminals of a loading coil happen to be the
same, it would likely be a rare coincidence.


All one has to do to see radical changes in the currents
at the ends of the coil is move the coil up and down
a 3/4WL radiator. One can find a place where current
at the top of the coil is five times the current at
the bottom of the coil. That's just the way standing
wave current works. Too bad there are so many myths
and old wives' tales being spread about it by alleged
"experts" who have forgotten EE201.
--
73, Cecil http://www.qsl.net/w5dxp
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