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#381
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Analyzing Stub Matching with Reflection Coefficients
Dave wrote:
This is all because 'standing waves' don't exist! they are a figment of early experimenter's attempts to make tuning measurements on open wire lines using improvised tools. Because the current or voltage peaks and dips they were measuring seemed to be wave shaped and occured at intervals of 1/2 wavelength along their feedlines, and didn't move, they called them 'standing waves'. A complete misnomer, but quite adequate for the purpose they were used for... and are still used for. Though today we understand that the effect is caused by the superposition of forward and reflected waves and can measure the separate component waves, the legacy term still remains in common use. Not only does it remain in common use, but it dictates reality for some folks, at least in their own mind. -- 73, Cecil http://www.w5dxp.com |
#382
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Analyzing Stub Matching with Reflection Coefficients
Gene Fuller wrote:
Dave wrote: This is all because 'standing waves' don't exist! they are a figment of early experimenter's attempts to make tuning measurements on open wire lines using improvised tools. Because the current or voltage peaks and dips they were measuring seemed to be wave shaped and occured at intervals of 1/2 wavelength along their feedlines, and didn't move, they called them 'standing waves'. A complete misnomer, but quite adequate for the purpose they were used for... and are still used for. Though today we understand that the effect is caused by the superposition of forward and reflected waves and can measure the separate component waves, the legacy term still remains in common use. Yet another person who does not believe in superposition for linear systems. No, yet another person who believes that forward waves and reflected waves do NOT interact and therefore maintain their separate identities moving at the speed of light in opposite directions, in accordance with the wave reflection model. -- 73, Cecil http://www.w5dxp.com |
#383
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Analyzing Stub Matching with Reflection Coefficients
"Cecil Moore" wrote in message
. . . Are you still standing by your use of standing wave current with its unchanging phase to "prove" that there is no phase shift through a loading coil? I can also use that same technique to prove there is no phase shift in a 90 degree stub. Once again, I request that anyone who is interested in seeing what I wrote please look it up at groups.google.com, and not rely on Cecil's recollection and creative interpretation of what I wrote. Roy Lewallen, W7EL |
#384
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Analyzing Stub Matching with Reflection Coefficients
"Gene Fuller" wrote in message ... Dave wrote: "Cecil Moore" wrote in message . .. Roy Lewallen wrote: Congratulations, Cecil! Your reputation among your peers is intact. Technical truth is the only winner here, Roy. Nobody has provided an example of a standing wave existing without the component forward and reverse waves. Nobody has explained how the photons in the standing wave can possibly stand still. Looks like the wave reflection model is alive and well in spite of the obvious agenda to kill it off. Are you still standing by your use of standing wave current with its unchanging phase to "prove" that there is no phase shift through a loading coil? I can also use that same technique to prove there is no phase shift in a 90 degree stub. This is all because 'standing waves' don't exist! they are a figment of early experimenter's attempts to make tuning measurements on open wire lines using improvised tools. Because the current or voltage peaks and dips they were measuring seemed to be wave shaped and occured at intervals of 1/2 wavelength along their feedlines, and didn't move, they called them 'standing waves'. A complete misnomer, but quite adequate for the purpose they were used for... and are still used for. Though today we understand that the effect is caused by the superposition of forward and reflected waves and can measure the separate component waves, the legacy term still remains in common use. WOW!!! Yet another person who does not believe in superposition for linear systems. no, i heartily DO believe in superposition. what i hate the misnomer 'standing waves' that has misled many non technical people to an incorrect view of how waves work. |
#385
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Analyzing Stub Matching with Reflection Coefficients
On Wed, 25 Apr 2007 16:18:24 -0700, Roy Lewallen
wrote: Once again, I request that anyone who is interested in seeing what I wrote please look it up at groups.google.com, and not rely on Cecil's recollection and creative interpretation of what I wrote. Hi Roy, It seems this technique has become rather commonplace as a recent complaint of mine would reveal, and few are interested in snorkeling through the sewer to find a lost reputation. Recommendations for searching the archives should be confined to finding facts, which are few and more easily described in the constraints of a search engine; looking for evidence of distortions would cripple the bandwidth capacity of the Internet. 73's Richard Clark, KB7QHC |
#386
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Analyzing Stub Matching with Reflection Coefficients
Dave wrote:
"Cecil Moore" wrote in message . .. Roy Lewallen wrote: Congratulations, Cecil! Your reputation among your peers is intact. Technical truth is the only winner here, Roy. Nobody has provided an example of a standing wave existing without the component forward and reverse waves. Nobody has explained how the photons in the standing wave can possibly stand still. Looks like the wave reflection model is alive and well in spite of the obvious agenda to kill it off. Are you still standing by your use of standing wave current with its unchanging phase to "prove" that there is no phase shift through a loading coil? I can also use that same technique to prove there is no phase shift in a 90 degree stub. This is all because 'standing waves' don't exist! they are a figment of early experimenter's attempts to make tuning measurements on open wire lines using improvised tools. Because the current or voltage peaks and dips they were measuring seemed to be wave shaped and occured at intervals of 1/2 wavelength along their feedlines, and didn't move, they called them 'standing waves'. A complete misnomer, but quite adequate for the purpose they were used for... and are still used for. Though today we understand that the effect is caused by the superposition of forward and reflected waves and can measure the separate component waves, the legacy term still remains in common use. Yep, Darwin was a tool of the Devil, the Earth is flat, faith can heal all disease, and the Earth is 6000 years old. 73, Tom Donaly, KA6RUH |
#387
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Analyzing Stub Matching with Reflection Coefficients
Roy Lewallen wrote:
Once again, I request that anyone who is interested in seeing what I wrote please look it up at groups.google.com, and not rely on Cecil's recollection and creative interpretation of what I wrote. I doubt that anyone is interested enough to wade through thousands of postings so I fetched one of yours: Current Through Coils Mar 22, 2006, 1:11 pm Roy Lewallen, W7EL wrote: The total current ("standing wave current" in Cecil's parlance) certainly does have an associated phase angle, and its phasor certainly does rotate. (By "phase" I mean time phase.) A sinusoidal traveling current wave can be expressed as a phasor whose value is a function of position. When you add a forward traveling wave to a reverse traveling wave, you're adding two phasors. The result is a phasor whose value is the vector sum of those two phasors. This is the total current. It has magnitude and phase like any other phasor, and the same rotational speed as its components. The standing wave current phasor has the "same rotational speed as its components"??? How can that be when the forward current phasor and the reflected current phasor are rotating in opposite directions? Your statement above is in direct contradiction to Kraus's graph of phase on a 1/2WL dipole where the current phase from end to end varies away from 0 degrees by only a couple of degrees. EZNEC agrees with Kraus. That graph is Figure 14-2 on page 464 of "Antennas for all Applications", 3rd edition. EZNEC says the phase of the current on a 12WL dipole varies by only two degrees over the entire antenna. If the phase of the net current doesn't vary end to end on a 1/2WL dipole, how could you and W8JI use it to try to prove that the phase shift through a loading coil is zero degrees? Isn't that called assuming the proof? -- 73, Cecil http://www.w5dxp.com |
#388
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Analyzing Stub Matching with Reflection Coefficients
Tom Donaly wrote:
Yep, Darwin was a tool of the Devil, the Earth is flat, faith can heal all disease, and the Earth is 6000 years old. You forgot: Forward waves and reverse waves interact to form standing waves which is what would have to happen to satisfy some of the assertions made in this thread. -- 73, Cecil http://www.w5dxp.com |
#389
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Analyzing Stub Matching with Reflection Coefficients
On Apr 23, 1:18 pm, Cecil Moore wrote:
Amateur transmitters are not designed to be linear and they are NOT linear. Adding a ten cent resistor to them is not going to make them linear. -- 73, Cecil,http://www.qsl.net/w5dxp What a crazy Alice-in-Wonderland world you live in, Cecil! It's fun to visit you there, but I'm glad I don't have to live in it. I do hope it's an enjoyable place for you, though I am sorry you're unable to visit ours. From the labs, Bunsen |
#390
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Analyzing Stub Matching with Reflection Coefficients
Dr. Honeydew wrote:
What a crazy Alice-in-Wonderland world you live in, Cecil! It's fun to visit you there, but I'm glad I don't have to live in it. I do hope it's an enjoyable place for you, though I am sorry you're unable to visit ours. Can we at least agree that a class-C amplifier is not linear? -- 73, Cecil http://www.w5dxp.com |
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