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#551
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Loading Coils; was : Vincent antenna
Keith Dysart wrote:
So sometimes a 600 to 100 ohm discontinuity produces a 36.6 degree phase shift and sometimes it produces a 22.7 degree phase shift (and probably any value in between). Yes, of course - nobody said the phase shift wasn't a variable. Why would you expect it to be a constant? It is a variable that depends upon the phase of the component forward and reflected waves. I suggest that "work[ing] up the phasor diagrams of the component voltages (or currents) at the junction where rho = (600-100)/(600+100) = 0.7143" will not be useful for predicting the phase shift. It will be useful for reporting that particular phase shift. If other conditions change, that phase shift will change. What is unexpected about that? -- 73, Cecil http://www.w5dxp.com |
#552
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Loading Coils; was : Vincent antenna
Keith Dysart wrote:
Sounds good, but mostly you do not examine ideal conditions because they tend to show that the models fail. I believe that is a false statement. Please prove your assertion. -- 73, Cecil http://www.w5dxp.com |
#553
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Loading Coils; was : Vincent antenna
Roy Lewallen wrote:
My postulate is that Newton was wrong: moving objects come to a rest without any external applied force. Every observation made supports this. There's no need to consider what happens in a frictionless environment, since such a thing doesn't exist. There seems no limit to which you will go to protect your old wives' tales. How about taking a look at the EZNEC file at: http://www.w5dxp.com/coil512.ez and commenting on the results. Nobody is going to hold his breath while you make up your mind. -- 73, Cecil http://www.w5dxp.com |
#554
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Loading Coils; was : Vincent antenna
John Smith wrote:
Dave Heil wrote: ... Dave K8MN Dave: You remind me of a fellow in the neighborhood when I was a kid, used to go around talking to himself all the time ... no one paid him much attention, nowadays would be different of course. :-) We'll never know to what you refer, "John". You snipped it. Look, you're already using a pseudonym, why not just admit that you're that kid you mentioned? If you're accusing me of talking to myself, walk through the scenario. You made a newsgroup response to one of my posts. I responded to you. You responded to me. I responded to you. It is apparent that I'm not talking to myself. Dave K8MN |
#555
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Loading Coils; was : Vincent antenna
Cecil Moore wrote: Jim Kelley wrote: What does "its current maximum is not caused by standing waves" mean to someone with an "IQ of 168"? I explained it already. The current maximum in a loading coil is caused by the magnetic flux linkage between the adjacent coils. Yes, you did say that, but it isn't apparent to me that the two statements are necessarily mutually exclusive. To me those things are all interdependent. Insofar as constructive interference is caused by reflections from discontinuities and not the other way around, then yes. But the current maximum is simply an area of constructive interference. It is the profile of a standing wave in 2 dimensions caused by the superposition of forward and reflected waves. The phase and amplitude of the forward and reflected waves are of course determined by the nature of the line, and those parameters determine the profile of the standing wave. It is the same thing that approximately doubles the velocity factor of the coil over what it would be if the all the current followed the wire. I think current is required to follow the wire in any case. :-) 73, Jim AC6XG |
#556
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Loading Coils; was : Vincent antenna
Jim Kelley wrote:
Cecil Moore wrote: I explained it already. The current maximum in a loading coil is caused by the magnetic flux linkage between the adjacent coils. Yes, you did say that, but it isn't apparent to me that the two statements are necessarily mutually exclusive. The distance between current anti-nodes is 180 degrees. All the lack of apparentness in the world will not change that fact of physics. -- 73, Cecil http://www.w5dxp.com |
#557
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Loading Coils; was : Vincent antenna
On 7 Dec, 12:24, Roy Lewallen wrote:
Keith Dysart wrote: Sounds good, but mostly you do not examine ideal conditions because they tend to show that the models fail. With non-ideal conditions, the discussion is easy to drive far from the target and prevent resolution of whether the model works. My postulate is that Newton was wrong: moving objects come to a rest without any external applied force. Every observation made supports this. There's no need to consider what happens in a frictionless environment, since such a thing doesn't exist. Roy Lewallen, W7EL Wrong.. When you are beyond the confines of all gravitational fields and in a state of equilibrium then there can not be friction. Somebody somewhere has obviously postulated that gravitational forces are every where which puts science back in the stone ages. Sure messes up Gauss and quite a few others. In fact the law of statics is based on gravitational field which extends to what Gauss called the limits of gravitational effects. Quite a few other laws are based on similar logic Art Unwin KB9MZ.....XG(uk) |
#558
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Loading Coils; was : Vincent antenna
Cecil Moore wrote:
The distance between current anti-nodes is 180 degrees. Such insight is incredible to behold. ac6xg |
#559
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Loading Coils; was : Vincent antenna
art wrote:
Wrong.. When you are beyond the confines of all gravitational fields and in a state of equilibrium then there can not be friction. Somebody somewhere has obviously postulated that gravitational forces are every where which puts science back in the stone ages. Sure messes up Gauss and quite a few others. In fact the law of statics is based on gravitational field which extends to what Gauss called the limits of gravitational effects. Quite a few other laws are based on similar logic Art Unwin KB9MZ.....XG(uk) That has got to be the worst logic I have EVER heard and flies in the face of common sense to be unspeakable--Roys' comment. An object in motion, with NO external forces HAS to continue to move with exactly the same stored energy as it began with, even a trillion years later ... Logic asks: Where would the stored energy go? Imparted to nothing? Just disappears--breaking all the laws dealing with the conservation of energy also? Art, give up, we are in the twilight zone, look for an exit! However, an ABSOLUTE frictionless environment may be quite difficult to come up with ... Regards, JS |
#560
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Loading Coils; was : Vincent antenna
Dave Heil wrote:
... Dave K8MN Dave: While your statements are quite well constructed to inflame and insult a child--that has to do with your mind, not my age ... ROFLOL! JS |
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