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#1
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Art Unwin wrote:
Equilibrium means equilibrium thus there are no reflections. No reflections on a standing-wave antenna? Where do the standing waves come from? -- 73, Cecil, IEEE, OOTC, http://www.w5dxp.com |
#2
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On Sep 4, 3:00*pm, Cecil Moore wrote:
Art Unwin wrote: Equilibrium means equilibrium thus there are no reflections. No reflections on a standing-wave antenna? Where do the standing waves come from? -- 73, Cecil, IEEE, OOTC, *http://www.w5dxp.com There are no standing waves either |
#3
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On Sep 4, 3:40*pm, Art Unwin wrote:
On Sep 4, 3:00*pm, Cecil Moore wrote: Art Unwin wrote: Equilibrium means equilibrium thus there are no reflections. No reflections on a standing-wave antenna? Where do the standing waves come from? -- 73, Cecil, IEEE, OOTC, *http://www.w5dxp.com There are no standing waves either Remember my WL is a closed circuit |
#4
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Art Unwin wrote:
Remember my WL is a closed circuit Believe it or not, there are reflections at the feedpoint caused by the Z0 physical impedance discontinuity. You would be correct only if your "closed circuit" was a traveling wave antenna. But if it was a traveling wave antenna, its feedpoint impedance would be in the hundreds of ohms which, I assume, it is not. The fact that your antenna doesn't have a feedpoint impedance equal to the Z0 of the antenna wire proves that reflections are present. W8JI made essentially the same mistake in his loading coil delay measurements so don't feel bad about it. -- 73, Cecil, IEEE, OOTC, http://www.w5dxp.com |
#5
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Art Unwin wrote:
There are no standing waves either If there were no standing waves, a current pickup would read a constant current when moved up and down the conductor, but it doesn't. A current pickup proves there are standing waves. You can see it with your own eyes using RF current meters available from MFJ. If your theory rests on "no standing waves" being present, it can easily be disproved. -- 73, Cecil, IEEE, OOTC, http://www.w5dxp.com |
#6
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On Sep 4, 6:57*pm, Cecil Moore wrote:
Art Unwin wrote: There are no standing waves either If there were no standing waves, a current pickup would read a constant current when moved up and down the conductor, but it doesn't. A current pickup proves there are standing waves. You can see it with your own eyes using RF current meters available from MFJ. If your theory rests on "no standing waves" being present, it can easily be disproved. -- 73, Cecil, IEEE, OOTC, *http://www.w5dxp.com I will wait for that day. Regards |
#7
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Art Unwin wrote:
I will wait for that day. No need to wait. It's easy to make the measurements for yourself. I have already done it to prove that standing wave current, with its unchanging phase relative to the feedpoint current, cannot be used to measure the phase delay through a loading coil. If a current probe is used to measure a traveling wave, the amplitude will be constant. If the amplitude changes from point to point, it contains a standing wave. -- 73, Cecil, IEEE, OOTC, http://www.w5dxp.com |
#8
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Cecil Moore wrote:
Art Unwin wrote: I will wait for that day. No need to wait. It's easy to make the measurements for yourself. I have already done it to prove that standing wave current, with its unchanging phase relative to the feedpoint current, cannot be used to measure the phase delay through a loading coil. If a current probe is used to measure a traveling wave, the amplitude will be constant. If the amplitude changes from point to point, it contains a standing wave. Art? Measure something? You must be kidding. Next you'll expect him to tell us how to build one of his antennas. Then we'd all know for sure what a fraud he is. tom K0TAR |
#9
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On Sep 4, 7:31*pm, tom wrote:
Cecil Moore wrote: Art Unwin wrote: I will wait for that day. No need to wait. It's easy to make the measurements for yourself. I have already done it to prove that standing wave current, with its unchanging phase relative to the feedpoint current, cannot be used to measure the phase delay through a loading coil. If a current probe is used to measure a traveling wave, the amplitude will be constant. If the amplitude changes from point to point, it contains a standing wave. Art? *Measure something? *You must be kidding. Next you'll expect him to tell us how to build one of his antennas. Then we'd all know for sure what a fraud he is. tom K0TAR Tom You are losing it and getting worse. Why don't you block my posts? That way you will not lose any sleep. I just smile when you post but in return you get so angry you don't make much sense it terms of a response Right from the get go all denied that adding a time varying field to Gaussian static theorem provides mathematics of radiation as taught by Maxwell. Until this group recognises this it is pointless to proceed. You will just have to live with that until all can come to terms with that statement.You will not read it in any book so you have to go back to first principles for yourself. If your learning in life is based on rote or memorizing books then you are out of luck. If you can't come to terms on that then it is you who is the fraud Failing that you will just have to rely on intuition instead of mathematical facts |
#10
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tom wrote:
Cecil Moore wrote: Art Unwin wrote: I will wait for that day. No need to wait. It's easy to make the measurements for yourself. I have already done it to prove that standing wave current, with its unchanging phase relative to the feedpoint current, cannot be used to measure the phase delay through a loading coil. If a current probe is used to measure a traveling wave, the amplitude will be constant. If the amplitude changes from point to point, it contains a standing wave. Art? Measure something? You must be kidding. Next you'll expect him to tell us how to build one of his antennas. Then we'd all know for sure what a fraud he is. Actually, Art gave me directions for building his 160 meter antenna, the one people call "The Shoebox". SO you're not quite right on that point. I looked at it, and decided that it very closely resembled an EH antenna, with a tuned circuit on top of some coax. Those type of antennas work after a fashion, probably through feed line radiation in this case. So you could likely build it, install it, and make some contacts with it. Whether that makes it a good antenna is up for discussion. I'd probably go with something else. - 73 de Mike N3LI - |
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