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Old May 15th 07, 06:44 PM posted to rec.radio.amateur.antenna
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First recorded activity by RadioBanter: Mar 2007
Posts: 3,521
Default Phase Shift through a 75m Texas Bugcatcher Coil

Jim Kelley wrote:
Cecil Moore wrote:
Yes, but the delay is not measurable using standing
wave current because standing wave current doesn't
change phase in a coil or in a wire.


But you aren't measuring it. The point is, it's calculable.


But w8ji and w7el *are* measuring it and getting something
different from those calculations. They are reporting their
flawed measurements as technical fact. That's what the
whole argument is about. There is no way in heck to get a
3 nS delay out of a 100 turn, 10", 2" diameter coil.

It is more useful for determining the delay through the
coil.


The fact that it doesn't give you an answer that agrees with any other
method notwithstanding.


It means that the existing posted methods are invalid. And
that doesn't extend just to the side that asserts the
delay through the coil is close to zero. It also extends
to the other side who accepts the use of standing-wave
current as a valid measurement technique. *All* of the
measurements made using standing-wave current are bogus.

If I were trying to measure delay I would use pulses.


How do you know the pulsed delay is the same as the
steady-state delay? Has anyone published a delay using
pulses? I'm not saying a pulsed delay won't yield valid
results - I just don't know. If it is a DC pulse, there
would be known problems.

I would want the system to be configured in exactly the same way as I
intended for it to be used.


Then you will find it is impossible to measure the delay
through the coil during steady-state.
--
73, Cecil http://www.w5dxp.com
 
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