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Is there a web site where I can read about the relation between the
thickness of the wire and the bandwith. ================================ Antenna bandwidth changes very slowly relative to wire diameter. It is best considered in terms of antenna Q at 1/2-wave or 1/4-wave resonance. Approximately - Q = 1.7 * [ Ln( Lambda / 2 / Diameter ) - 1] where Lambda is free-space wavelength and conductor diameter is in the same units. Ln is the logarithm to the base e. The formula applies up the point where conductor diameter is about 1/6 of dipole antenna length. Knowledge of antenna bandwidth is not of great practical use at HF because the Q of the feedline plus tuner has at least the same effect on the overall system bandwidth as the antenna. Download program DIPCAGE2 from website below to see how bandwidth changes with effective diameter of a dipole cage antenna. ---- .................................................. .......... Regards from Reg, G4FGQ For Free Radio Design Software go to http://www.btinternet.com/~g4fgq.regp .................................................. .......... |
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