Reg Edwards wrote:

W5DXP wrote:
The consensus of opinion over on science.physics.electromag is
that a two foot long section of 50 ohm coax is all the length
needed to force the V/I ratio to be 50 ohms at HF - something
to do with the length Vs separation between conductors ratio.
That V/I ratio = 50 is the assumption made by the SWR meter
designer when the meter is calibrated.

Your science.physics.elecromag correspondent invented the idea specially for
you and was amusing himself by pulling your leg. And now you're trying to
pull mine.

OK, Reg, when the conductors are 1/4 inch apart, what length
of coax is necessary for the Z0 of the coax to effect the
ratio of E-field to H-field? Those pretty smart guys over
on s.p.e say a ratio of 100:1 length/separation is plenty
enough to force the V/I ratio to be 50 ohms.

We can actually measure the V/I ratio at the input to the
SWR meter. I'll bet, when a properly calibrated 50 ohm SWR
meter is reading zero reflected power, that the V/I ratio
is indeed 50 ohms.
--
73, Cecil http://www.qsl.net/w5dxp


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