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On Sep 18, 11:23*pm, Jeff Liebermann wrote:
On Thu, 18 Sep 2008 18:52:26 -0700 (PDT), Art Unwin wrote: On Sep 18, 7:02*pm, Jeff Liebermann wrote: On Thu, 18 Sep 2008 14:28:18 -0700 (PDT), Art Unwin wrote: ...where as, your expertise in mathematics can test the logic to its limits which defy opposition I am having a go at this before I read the questions!!!! A go at what? *That was your statement that I quoted. 1. *If current flows along the inside of a wire, and not on the outside, how does the field radiate through the alleged non-conducting outer part of the wires? *The radiation would be trapped inside the conductor, only to perhaps emerge at end Due to the length of your extended sentences, I have to edit them in sections to extract individual concepts. a length of radiator which is a fractional wavelenth will have charges in motion on the outside I thought you said that fractional wavelength antennas have maximum current on the inside of the conductor. *(I'm lazy and don't want to search for the specific quote). *Please decide if it's inside or outside. creating radiation the rest of the charge length will be inside the radiator where a magnetic field cannot be created and particles if they were present cannot pierce the eddy current on the surface. Particles? *Where do I get a bottle of RF? Eddy currents only occur when there is an opposing magnetic field restricting the flow of electrons. *You might have such a problem in a transformer design, but nobody designs match boxes, xformers, and antennas that way: http://en.wikipedia.org/wiki/Eddy_current RF current flows on the outside of a conductor whether it's shorter or longer than one wavelength long. *Show me a formula where there's a break point at 1 wavelength. For radiation at all times the radiator must be a wavelength or multiple thereof or a period of the frequency in use for radiation to not disappear from the surface where the levitating force is present to eject particles Particles? *Where do I get a bottle of RF? My 80 meter antenna is considerably shorter than one wavelength. *No loading coils but a suitable match box. *Are you telling me that my antenna does not radiate? 2. *If current flow along the inside of a wire, then it would seem that increasing the effective diameter of the conductor would have no effect on its impedance. *Measurements of the Q of large diameter conductors versus small diameter conductors have show that impedance goes down with an increase in wire diameter. the increase in diameter does not affect conditions *that are exposed to air thus the progression of skin depth is the same. My antennas are not affected by air. *The dielectric constant of air and a vacuum are sufficiently close to be considered identical. *How does the Q or impedance of an antenna change when exposed to air? Thus copper losses on the inside circuit will be reduced as well as lost radiation resistance in the circuit. What inside circuit? *Do you mean the inside of the conductor? Radiation resistance is increased or decreased, not lost. *It's not a quantity that can be bottled or sold. I previously stated that copper losses on the inside of a fractional wavelength antenna must be considered separately from the groundplain resistance which is required i.e. they are two separate resistances in series. Why must they be considered separately? *My radiation resistance calculations are the vector sum of the antenna impedance and any resistive losses that present in the conductors. *The radiation resistance is not a resistance that can be added. *It's an impedance that has a phase angle that must be added as a vector. 3. *How does a cage antenna work? *The effective diameter is huge, but there's a giant hole in the middle, through which no current is conducted. *If most of the RF current flowed through the center, and there is no center, then a cage antenna can't work. I am not familiar with a cage antenna but from the above description is that it is transformed into a Farady cage Nope. * http://en.wikipedia.org/wiki/Cage_antenna http://www.arrl.org/news/stories/2001/05/03/2/ http://forums.qrz.com/showthread.php?t=144503 (see drawing) It's usually an HF dipole with insulating spreaders at each end. *One wire per spreader. *This creates an effective wire diameter equal to the spreader diameter without the necessity of using a huge piece of tubing. *The large effective conductor diameter increases the operating bandwidth of the antenna. *No effect on the gain or pattern. No, I don't mean an elephant cage antenna: http://www.fas.org/irp/program/collect/an-flr-9.htm http://maps.google.com/maps?q=http:%2F%2Fbbs.keyhole.com%2Fubb%2Fdown.... I want one... I can conjur a few more rhetorical questions, but these should be sufficient to illustrate the problem. *Your antenna current distribution model does not fit very well with tested reality. Hmm why not? Because I don't have infinite amounts of time to continue doing this. I supplied 3 examples of common measurements and constructs that do not fit into your model of current being maximum at the center of a conductor. *That will have to suffice for now, or at least until I need some more entertainment. Got any more prediction? *I need the target practice. Yes Earlier I pointed to the fact that eddy current can be neutralised such that particles canot be ejected from the surface That's fine. *Now, how do I measure those eddy currents? *How are they calculated? *What affects their value. *Where do I get a bottle of RF particles? Indeependent testing showed there was nothing to prevent particles from settling on a diamagnetic substance thereby inducing an oscillation . An antenna by itself cannot oscillate (except maybe in the wind). *If particles "settled" on the antenna, its weight would increase. *How much? Are you familiar with the definition of diamagnetic? http://en.wikipedia.org/wiki/Diamagnetism Copper is non-magnetic. *None of my antennas levitate themselves. Diamagnetism will not create oscillations. At the same time on the transmitting side the particles were still present on the diamagnetic surface because the ejection force was neutralised thus preventing ejection otherwise seen as transmission. Huh? *What ejection force. *If there were an ejecting or levitation force on a copper antenna, it would be measurable. *How? * Another one The computor on the first example disapointed me as I expected a higher gain (stated on this net) Here we agree. *Measured gain always seems to be less than calculated gain. *That's due to the myriad of minor factors left out of the calculations. When I corrected the nullification of the foucault current by separation the computor program gave the gain Separation from what? *Foucault current is exactly the same as eddy current. *Since your separate computer program generated numbers, could I trouble you for the results? *Incidentally, eddy currents are always losses, not gains. I initiall expected in gun shot form which migrates in a way to a lazer ray which is oif a similar science thus HF does not necessarily have to diverge such that gain is nullified. Brain overload. *Cannot compute. *Error....error....error... imminent meltdown predicted.... abort... abort... pfffffffzt! If you want more target to aim at listen for the BIG BANG and then aim at the resulting BLACK HOLE Too late. *My brain just collapsed into a black hole and will soon go super nova. -- Jeff Liebermann * * 150 Felker St #D * *http://www.LearnByDestroying.com Santa Cruz CA 95060http://802.11junk.com Skype: JeffLiebermann * * AE6KS * *831-336-2558 So I made a mistake with you I can move on Art |
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