Cecil Moore wrote:

[snip]


I apologize for missing the small detail that S12 was a voltage
measurement rather than a current measurement but I'm sure you can
see how that was an honest mistake and easy to make. You didn't
mention "voltage" at all in your posting and the context was current.
I didn't recall until your objection here today that S12 is a voltage
parameter measurement.

But that leads to a question. Why were you using voltage measurements
to try to disprove Kraus' statement about 180 degree current phase
shifting coils. Quoting from: "Antennas for All Applications", Kraus
and Marhefka, 3rd edition, page 824: "A coil (or trap) can also act
as a 180 deg (current) phase shifter as in the collinear array ...
The coil may also be thought of as a coiled-up 1/2WL element."

Cecil,

Interesting,

The complete quote from Kraus on page 744 in my copy of his 2nd edition is:

"A coil (or trap) can also act as a 180 degree phase shifter as in the
collinear array of 4 in-phase lambda/2 elements in Fig. 16.30b. Here the
elements present a high impedance to the coil which may be resonated
without an external capacitance due to its distributed capacitance. The
coil may also be though of as a coiled-up lambda/2 element."


* It is possible that Kraus edited the comment in the 3rd edition, but I
don't see the word "current" in this quote. It is considered good
editorial form to indicate clearly when you have altered the original
wording, unless you are trying to make a point, I suppose.

* The coil in this case is self-resonant at the frequency of use. Do you
use a self-resonant coil for your 80 meter bugcatcher? (Such a coil
might be more appropriate for a pterodactyl catcher.) In any case, this
has little to do with all of your rantings about loading coils. I
suspect even at A&M they must have mentioned something about the
characteristics of resonant circuits.

* You might have noticed the prominent role of capacitance. I believe
that was the item that spurred this thread.

73,
Gene
W4SZ