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Old March 7th 06, 05:14 PM posted to rec.radio.amateur.antenna
 
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Default Current through coils

Cecil Moore incorrectly posted:

W8JI measured a 60 degree phase shift through a 100uH coil
at 1 MHz. Consider that at one end of that coil the
forward and reflected currents may be:
Ifor = 0.55 amps at zero deg, Iref = 0.45 amps at zero deg.

Inet = Ifor + Iref = 1 amp at zero degrees.

At the other end of the coil, the forward and reflected
currents may be:

Ifor = 0.55 amps at +60 deg, Iref = 0.45 amps at -60 deg
Inet = Ifor*cos(60) + Iref*cos(-60)

Inet = 0.275 + 0.225 = 0.5 amps at zero deg

The above analysis clearly shows how wrong Cecil is, and how he invents
reasons to support things.

I NEVER measured a current shift of 60 degrees, and I never said I
measured a current difference of 60 degrees.

The phase shift I measured was in VOLTAGE. It simply shows the voltage
is out of step with the current. It doesn't indicate current is shifted
60 degrees between each inductor terminal at all, and I never said it
did.

The current level at each end of the inductor was, as far as I can
measure with test equipment, equal.

This is another clear case of Cecil taking things out of context and
mixing them with his idea that an inductor treats current differently,
depending on what direction it "flows" (or whatever he is claiming, I
certainly can't make sense of his arguments).

It is always better to let people directly post what they say, and not
have it run through a "Cecil Moore" filter.

73 Tom