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Old March 12th 06, 10:40 PM posted to rec.radio.amateur.antenna
Cecil Moore
 
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Default Current through coils

John Popelish wrote:
But the goal of such "fights" should be altering other's opinions. How's
that been working out for you? ;-)


That's not my goal at all, John. My goal is to discuss the
technical facts. I really don't care if anyone "alters
their opinions" or not. That has been a personality
characteristic since my early days. My sister just
remarked on that same fact a few days ago. She said,
"You have never cared what other people think about
you." It wasn't a criticism, just an observation.

We may understand the results of Tom's latest
measurement by considering the following:

50 ohm source===1 WL 50 ohm lossless coax===8+j2500 load

Since the transmission line is lossless, this doesn't
change anything except for the additional one cycle delay
through the line.

What's the system SWR? I get 16000:1. I asked Tom
to measure the currents in the absence of a high SWR
and he takes his measurements in a 16000:1 SWR
environment. How well do you think he honored my
request for an SWR of 1:1? Shucks, he only missed
it by 1,600,000%. :-)

There is essentially no net energy flow in the above
network. Why are we suprised to measure equal standing
wave currents on each side of the coil? It wouldn't have
surprised me if Tom had measured *zero* phase shift just
like the lumped-circuit model predicts. The traveling-
wave delay through a coil simply cannot be measured
using Tom's methods.
--
73, Cecil http://www.qsl.net/w5dxp
 
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