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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 -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
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