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#881
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Current through coils
K7ITM wrote:
I REGULARLY model transmission lines as "lumped elements" and do NOT "presuppose that the speed of light" through them is infinite. I'm interested in knowing how you model a shorted quarter wavelength stub using the lumped element model. I REGULARLY model op amps as "lumped elements" and do NOT presuppose that the phase shift (and therefore propagation time) through them is infinite. I should hope not! You would never get a signal through them. :-) I REGULARLY model inductors as "lumped elements", and do not presuppose that they have no resistances and capacitances parasitic to their inductANCE. Then you are somehow applying a patch to the lumped element model. The basic lumped element model assumes no resistance and no capacitance. That's how the lumped inductance-only works in EZNEC. I find that my models very reliably predict the behaviour I actually observe in the circuits I build. I am served very well by the models I use. Do you use them on 75m bugcatcher coils and obtain an incorrect phase shift as W8JI and W7EL have done? By the way, what's EE203? The sophmore EE class alluded to by Dr. Corum. -- 73, Cecil http://www.qsl.net/w5dxp |
#882
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Current through coils
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#883
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Current through coils
Cecil Moore wrote:
K7ITM wrote: I REGULARLY model transmission lines as "lumped elements" and do NOT "presuppose that the speed of light" through them is infinite. I'm interested in knowing how you model a shorted quarter wavelength stub using the lumped element model. I REGULARLY model op amps as "lumped elements" and do NOT presuppose that the phase shift (and therefore propagation time) through them is infinite. I should hope not! You would never get a signal through them. :-) I REGULARLY model inductors as "lumped elements", and do not presuppose that they have no resistances and capacitances parasitic to their inductANCE. Then you are somehow applying a patch to the lumped element model. The basic lumped element model assumes no resistance and no capacitance. That's how the lumped inductance-only works in EZNEC. I find that my models very reliably predict the behaviour I actually observe in the circuits I build. I am served very well by the models I use. Do you use them on 75m bugcatcher coils and obtain an incorrect phase shift as W8JI and W7EL have done? By the way, what's EE203? The sophmore EE class alluded to by Dr. Corum. Cecil, there are two Corums and they're both Tesla coil crackpots. Secondly, Tom is right, you have to have capacitance to somewhere or your transmission line analogy becomes mired in absurdities. Third, it isn't enough to think something up in your head to make a convincing theory, you have to be able to predict behavior with it. Finally, you have to understand your subject before you even start thinking. I'm surprised you didn't even take the time to make a real coil and at least try to determine its characteristics before wasting everyone's time by starting this thread. 73, Tom Donaly, KA6RUH |
#884
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Current through coils
On Sat, 01 Apr 2006 19:26:42 GMT, Cecil Moore
wrote: Do you use them on 75m bugcatcher coils and obtain an incorrect phase shift as W8JI and W7EL have done? All measurements done by everyone are incorrect. Yours, by your own admission 59% in error, qualifies you for the Gold, Silver and Bronze medals of Olympian Mistakes. We can strike some Copper, Tin, and Lead medals, but you would scoop them up too. |
#885
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Current through coils
Tom Donaly wrote:
Cecil, there are two Corums and they're both Tesla coil crackpots. Secondly, Tom is right, you have to have capacitance to somewhere or your transmission line analogy becomes mired in absurdities. Would you guys please stop implying falsehoods and make an attempt to argue in good faith? I didn't say the capacitance didn't exist. I said it was a secondary effect to the superposition of the forward and reflected waves. That you are forced to twist what I said speaks volumes about your argument. Why don't you feel secure enough in your technical argument not to have to twist my words into something I didn't say? Third, it isn't enough to think something up in your head to make a convincing theory, you have to be able to predict behavior with it. I have predicted behavior on http://www.qsl.net/w5dxp/current.htm with text surrounding http://www.qsl.net/w5dxp/1WLDIP.GIF. That graphic is not disembodied as you claimed. It is surrounded with examples and text, more than enough proof for any rational person. The current at each end of a coil obviously depends upon where it is installed in the standing wave antenna system. Your wearing of blinders doesn't hide that technical fact from anyone except yourself. -- 73, Cecil http://www.qsl.net/w5dxp |
#886
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Current through coils
Richard Clark wrote:
All measurements done by everyone are incorrect. Yours, by your own admission 59% in error, ... Uhhhh Richard, those weren't measurements. Those were calculated results, using formulas out of books. The only measurements that I have made were of 1. self-resonant frequencies within the accuracy of an MFJ-259B and 2. standing wave phase measurements that agree with Kraus and EZNEC. The 59% accuracy was in my wild ass *guesses* as opposed to the 207% error in W8JI's phase *measurements*. -- 73, Cecil http://www.qsl.net/w5dxp |
#888
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Current through coils
On Sat, 01 Apr 2006 22:00:49 GMT, Cecil Moore
wrote: All measurements done by everyone are incorrect. Yours, by your own admission 59% in error, ... Uhhhh Richard, those weren't measurements. Those were calculated results, using formulas out of books. The crippling legacy of Xerox research. The only measurements that I have made were of 1. self-resonant frequencies within the accuracy of an MFJ-259B and 2. standing wave phase measurements Only indeed. Now there's some challenging qualification trials for an Olympic biathlon. that agree with Kraus Have you been sleeping with Kraus again? and EZNEC. Hmm, the same EZNEC you've impeached for accuracy? When we loop back to the top of this post to note the 59% error derived from work accomplished that "weren't measurements" and they agree with your "measurements" THAT just has to be another hallmark warning sign of bogus science - self validation. After 17,433 posts, you certainly work hard to convince yourself. ;-) |
#889
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Current through coils
Richard Clark wrote:
Have you been sleeping with Kraus again? Yes, I often sleep with Kraus and Balanis. You should try occasionally reading a reference book instead of watching The Three Stogies. :-) -- 73, Cecil http://www.qsl.net/w5dxp |
#890
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Current through coils
On 31 Mar 2006 16:34:07 -0800, wrote:
[snip] I'm sure the 800-post thread will continue another 800 posts. People must be bored. You've noticed :-) |
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