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Richard Fry wrote:
Do you believe that a 75m mobile antenna system using an artificially resonant (as in bugcatcher-loaded), electrically short whip produces the same elevation pattern and groundwave field strength at 1 km as an unloaded 1/4-wave vertical monopole for 75m with the same applied power using a good, buried radial r-f ground (say, 2 ohms or less)? No, the radiation pattern depends upon the *physical* length. The feedpoint impedance depends upon the *electrical* length. (I haven't said anything about the radiation pattern in my postings.) Unless the antenna is "full-sized", the physical length and electrical length are different. There is a free lossless phase shift between the top of a loading coil and the stinger. There's obviously zero radiation from that dimensionless point. That 40 electrical degrees of antenna is not physically there so it cannot radiate. -- 73, Cecil http://www.w5dxp.com |
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