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Partly because you used a conductor diameter about 16.5mm and Reg's
was 10mm. (Don't think I'd want to make a self-supporting element that long and that thin, myself. Maybe 50mm at the base and tapering to 25 or so?) That probably does not account for the whole difference. Did you both use the same sort of "ground plane"? Height above earth has only a slight effect. Cheers, Tom "JLB" wrote in message ... Kraus (2nd edition, p. 375) gives a different answer. Interpolating from the diagram on p. 375 (assuming length/diameter = 472) it is about 90-j250. Why the difference? -- Jim N8EE to email directly, send to my call sign at arrl dot net "Reg Edwards" wrote in message ... For a 5/8-wave vertical above ground at 24 MHz, conductor diameter 10 mm. - Base feedpoint resistance = 110 ohms Base feedpoint reactance = -j386 ohms Base loading coil inductance = 2.6 uH Coil diameter = 25 mm Coil length = 33 mm Number of spaced turns = 13 Wire = 14 awg = 1.64 mm diameter. For other heights, frequencies and coil dimensions download in a few seconds program BOTLOAD for immediate answers. ---- .................................................. ......... Regards from Reg, G4FGQ For Free Radio Design Software go to http://www.btinternet.com/~g4fgq.regp .................................................. ......... |
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