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On Mon, 20 Jun 2005 16:21:58 -0400, "Walter Maxwell"
wrote: Understood, Roy, but was this person saying that with just one height it wouldn't give sufficient accuracy, or is he saying that with impedance knowledge at many different heights there would still be no determination of any of the ground characteristics? Hi Walt, And per my several critiques into this matter, all such broad proclamations lack the fundamental of drawing a validation through correlating work in the subject. Let's examine the one point offered: He concluded that it wasn't possible to set the antenna height and make measurements with sufficient accuracy to infer the ground characteristics with any confidence. This, of course, presumes that this source has any actual authoritative data. Something that is prohibitively beyond the scope of an individual to determine (when it is already rejected through correlations of antenna characteristics and measurements) in the first place suggests there is none. Roy has already pointed out the futility of a piece-wise measurement throughout the bulk of earth soaked by RF to its skin depth. I have pointed out that these several treatments offered only go to the thin veneer of soil. Some conclusions drawn were preposterous on the face of the data offered. Further, to suggest the four lead measurement be stretched to employing wavelength sized leads is fraught with error through the denial of those leads becoming what every Amateur already has, an antenna. Reg has dismissed the use of an antenna to measure the earth's contribution of loss, or to distinguish its characteristics by perturbing the known characteristic of an antenna. Such dismissal is not an argument - it is a conceit. Walt, your data is comprehensive enough to build a soil model for the band you studied. I seriously doubt anyone could challenge your results if they were internally consistent. 73's Richard Clark, KB7QHC |
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