Cecil Moore wrote:
Ian White GM3SEK wrote:

Ian, I am leaving on a 6 state motorcycle trip and won't be
back until Monday. I would like for you to answer this
question while I am gone.

I've heard that, while operating portable, if I attach
a wire to my 75m mobile whip and run it up a tree, I
will be able to make more contacts. So I attach a 1/4WL
wire to the whip of my 75m mobile bugcatcher system.

I decide to measure the current "into" the bottom of the
coil and "out" of the top of the coil. To my utter amazement
I measure 1.3 amps flowing "into" the bottom of the coil and
2.1 amps flowing "out" of the top of the coil.

How does your lumped circuit theory explain that? Where is
that extra 0.8 amps of current coming from?

Please don't insult our intelligence by saying it cannot
happen. It does happen. I suspect you are at a loss to
explain it.

I do not expect equal currents at the top and bottom of any real-life
coil. That is a strawman argument, based on what *you* claim other
people are saying.

But you can make coils that come quite close to behaving like an ideal
lumped inductance. And the closer they are, the closer to equal I expect
the currents at the two ends to become, and the closer to zero I expect
the phase shift in current to be... because that is how pure inductance
behaves, with no exceptions due to "special situations".


Cecil, in all sincerity, have a good trip and please drive safely. I'd
have been much safer on the roads last weekend if I hadn't been thinking
about this stuff as well.



--
73 from Ian GM3SEK 'In Practice' columnist for RadCom (RSGB)
http://www.ifwtech.co.uk/g3sek