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On 23 Dec, 00:49, Richard Clark wrote:
On Sat, 22 Dec 2007 21:14:07 -0800 (PST), art wrote: My understanding is that it only takes a moderate magnetic field to levitate a free electron, which is a world of difference from what you are saying Hi Arthur, The difference is I have experience in the matter, you don't. *All you have to go on are books. Let's just take one very simple example about magnetic fields and electrons: The Magnetron! Do you know what's in a Magnetron? *I doubt it. *You will have to look it up in one of your books, whereas I've held on in my hands while servicing a transmitter. So, already knowing you haven't got a clue about what is in a Magnetron, then I will tell you. *Cathode, Anode, and Magnet - nothing else to get in the way. So, there you have your magnet, and it is whopping big one too with a whopping bloody field that goes waaaaaaaay beyond what you call moderate (moderate is about 12 orders of magnitude toooooo small in comparison!). Does this magnet rip electrons right out of the metal? *It would rip apart the metal first before that happened. *And yet electrons fly from Cathode to Anode ONLY when the Cathode is HEATED! *What is more, the magnet is utterly unnecessary for those electrons to flow. Ever wonder why Cathodes (or filaments) are heated? *Well, in this case (as in all other cases) because the Magnet doesn't have the oomph to pull the electrons off the cold, cold Cathode. *If a magnet can't do it, electrons are certainly not going to jump off an antenna - not unless there is sufficient potential to cause corona. *Even then they don't go very far - not even a foot. *Corona doesn't measurably add to DX unless you are at sea signaling by semaphore. Now, can you tell us what a "work function" is? *If you could, then this nonsense about levitating electrons would collapse. I will give you a week to do your research. * :-) 73's Richard Clark, KB7QHC My point is that the element being diamagnetic and generating a magnetic field will displace a free electon or particle from it's surface. The force or magnetic field, even tho moderate, levitating the particle has a reactive force upon the radiator. The succession of these reaction forces puts the radiator into oscillation since just like a pendulum there are two discharges of energy per cycle. This cycle of events replicate a tank circuit which is well documented I am not requesting that a large item be levitated but only a small particle which by using the parameters put forward by Gauss is now free to remove itself from the given arbitary field. These free electrons, of which there are many, are so dense that they will appear as a wave as they move away from the near field where they search for another diagmatic resting place. If that new resting place is also resonant at the same frequency then the impacts will be a mirror image of that which created them thus providing a medium for the transfer of communication. The laws of the universe are very simple in nature tho experts strive to make them difficult Art |
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#2
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Art wrote:
"My understanding is that it only takes a moderate magnetic field to levitate a free electron, which is a world of difference from what you are saying." Moderate fields make free electrons move moderately within and on the surface of conductors. Electron emission requires more energy than does conduction. Conduction produces a magnetic field which can produce an electric field, etc., etc., etc.. No threshold must be exceeded to produce radiation from an antenna. The weakest received signal must cause at least 50% of its received carrier power to be re-radiated from an antenna of good conductivity. Best regards, Richard Harrison, KB5WZI |
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#3
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On 23 Dec, 13:21, (Richard Harrison) wrote:
Art wrote: "My understanding is that it only takes a moderate magnetic field to levitate a free electron, which is a world of difference from what you are saying." Moderate fields make free electrons move moderately within and on the surface of conductors. Pardon me but when a free electron or particle is resting on a diamagnetic surface in a electromagnetic field it moves ONLY in a directionm at right angles to the diagmatic surface and no other direction until the electro magnetic field diminishes. The phrase" within and on a surface is somewhat inaccurate" Art snip regards, Richard Harrison, KB5WZI |
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#4
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Art wrote:
"The phrase within or on the surface is somewhat inaccurate." At risk of boring some to tears, please consult the 1955 opus of F.E. Terman, pages 865 and 903 for radiation patterns of elemental and 1/2-wave doublets when currents flow in an axial direction on a conductor. Recall that the conductor can be ever so thin and that reciprocity rules in antennas. Best regards, Richard Harrison, KB5WZI |
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