Cecil Moore wrote:


W8JI measured a 4.5 degree phase shift in the
standing-wave current being used for the
measurement although virtually no phase
information exists in the standing-wave current
phase. W7EL made exactly the same mistake in
his measurements. No wonder the two agree.

Cecil,

I have stared at the W8JI web page

http://www.w8ji.com/inductor_current_time_delay.htm

for a long time, and I just cannot find anyplace where he mentions 4.5
degrees. Is that your calculation rather than Tom's?

The graphic appears to be a screen shot from a network analyzer. W8JI
does not describe it any further on that page, but it may be an HP
8753D, based on information elsewhere on his site.

In any case the plot appears to be S21 "delay" vs. frequency. I do not
know anything about that instrument, but this appears to be an
appropriate choice for the question at hand. There are two markers
active. Marker 1 shows 3.0361 ns at 3.825 MHz. Marker 2 shows 486.43 ns
at 16.11525 MHz. Marker 1 presumably represents a typical 80 m
frequency. Marker 2 is at a peak in the graph, and it appears to mark a
resonance.

Sooooo, the questions a

* Who made the mistake?
* Does the HP network analyzer system not work correctly?
* Do you think the HP engineers were not aware of standing waves?
* Did Tom make the hook-up incorrectly?
* Is there some other calibration factor needed? (Perhaps the Corum
factor or the Cecil factor was omitted.)
* Did the analyzer place the decimal point in the wrong spot?
* Is "new math" needed? Does 3.0361 ns really equal 30 ns in some other
coordinate system?

Inquiring minds want to know.

8-)

73,
Gene
W4SZ