[Elecraft] OT: SGC Coupler / Small Wire Loops

[Ron D'Eau Claire]

OOPS!=20

George, W5YR, kindly pointed out to me that I was ... well, as he put in
very gentlemanly, I "gave him heartburn". And with good reason, because =
I
generalized too much and incorrectly when I wrote: "And, again, you are
absolutely right, the current and voltage are 180 degrees out of phase =
and
MUST be in order for energy to flow efficiently in the circuit. Indeed, =
in
any resonant circuit (including any antenna) that is essential for power
transfer."

NOT true. The phase relationship between voltage and current are =
critical
for power transfer, but to say the phase relationship are 180 degrees is
wrong. That is true when describing the operation of a resonant circuit =
as I
was doing earlier, but that is only one case.=20

James Clerk Maxwell described the behavior of electric and magnetic =
fields
mathematically in the 1800's and his data still stands. I am not here to
refute it, but in answering a question quickly I have demonstrated that =
I
can scramble it beyond recognition.=20

The phase relationships between the current and voltage in a circuit
carrying an alternating current (including those high-frequency =
alternating
currents we call "RF") are critical to the efficient transfer of power, =
and
those phase relationships are controlled by the inductive and capacitive
reactances in the circuit. An ATU, like virtually any "coupling =
circuit",
"filter" or other circuit that handles a-c signals uses those phase
relationships to do its job helping or impeding the flow of a-c currents
from one place to another.=20

So, please let me amend my statement above and say that the "phase
relationship of the voltage and current are absolutely critical in order =
for
the energy to flow efficiently..."

And thank you George, for pointing out that I was trying to give Maxwell =
get
a case of heartburn as well...

Ron AC7AC
K2 # 1289