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Well Reg,
After years of harping on about your lack of a method, you rummage this up: On Mon, 20 Jun 2005 10:49:54 +0000 (UTC), "Reg Edwards" wrote: .... 13. I have made HF measurements in other shaped containers, usually smaller and plastic, with copper sheets for electrodes. Also in the garden itself between radials and arrays of relatively short rods. Any sort of measurements are more useful than none. I don't see you asking Walt for his data to CONFIRM your method. I don't see you doing any where near Walt's effort in building a sample matrix of your own to test against your method to CONFIRM your method. Validation seems to be an orphan in this discussion. Some people say the only way to deternine soil characteristics is to construct a 1/4-wave vertical antenna, feed it with 50 Kwatt at 500 KHz and measure field strength at 1 mile intervals for 100 miles. And then do some calculations. Don't you believe it! Bosh! Some people indeed. Your biology instruction in the British school system apparently didn't teach you the difference between people and straw-men. The veiled suggestion of a result 10. Using classical transmission line formulae in reverse, the values of line conductance G, capacitance C and hence permittivity K of the "insulating" material, i.e., the soil, can be calculated. is representative of an extremely thin veneer, ignoring the bulk that is so easily found by using the antenna in situ - the method you dismiss as unbelievable, and what is experienced every day by absolutely every Amateur on "Earth." Reg, it was a nicely scripted recipe. It contains well explained methods. It attends practical issues of measurement. However, it wholly lacks common sense when you reject what is already observable. What you offer is minutia of an old wife's tale. For method, any existing antenna's free-space characteristics is far better understood and revealed through a model than what you offer. And that antenna's free space Z characteristics compared against measured in situ Z performance yield the solution of what contribution local earth has to offer. Single point measurement of contaminated soil samples has as little chance of doing the same as trying to measure the ocean's capacity with a teaspoon. 73's Richard Clark, KB7QHC |
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