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#17
September 15th 09, 12:31 PM
posted to rec.radio.amateur.antenna
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Spherical radiation pattern
On Sep 15, 7:06*pm, "christofire" wrote:
"Szczepan Białek" wrote in message ... "Richard Clark" wrote .. . As I stand on the corner waving goodbye to that bus, I fondly recall how the logic stood that no current could be found on the tips of radiators, thus trim them off to no loss of radiation. *It took very few decades before Art had then recognized that his new antenna's tips had no more current than the full-length one, and he trimmed that one once again! *New and improved (as the saying goes). *Another decade passed into the new millennium and he observed that he could extend this logic once again to the point where his last design encompassed a 160M full sized antenna in the space of two shoe boxes. *The TRIUMPH OF TITANIC PROPORTIONS. Is any simillarity between Art and Tesla? Bill Miller wrote: "*But* Tesla's "antennas" were similar physically to the well-known "Tesla Coil." These antennas, in spite of their enormous size, were electrically "small" when compared with a wavelength. They were essentially a metallic ball that was fed from the secondary of a resonant transformer. But they appear to have had fairly large effective bandwidths in spite of their electrically small size," S* Tesla created HF transformers. *He didn't design them as antennas but, because of their significant length at the operating wavelength, they did act that way to some extent. *The metallic ball (often a torus nowadays) is a means of terminating the secondary in a way that reduces spurious discharges - its radius of curvature is large. *His ideas to distribute electrical power using Tesla coils were crazy and dangerous, but some argue he was the inspiration for AC distribution at much lower voltages, which is a good thing. There is very little apparent similarity between Nicola Tesla and that 'Art Unwin' character. *Tesla was an inventor who realised amazing feats of hardware construction, some of which worked as intended. *'Professor Unwin' doesn't appear to create anything in hardware - he just talks about his own, paraphysical theories and expects others to believe what he says. Again, don't believe what I write - go to a technical library and read the stuff that made it into books. *You can't rely on what people write on the internet; there are too many 'Unwins' out there. Chr |
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