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#10
April 3rd 14, 12:04 AM
posted to rec.radio.amateur.antenna
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Radials
Ian Jackson wrote:
In message , writes The theoretical gain of a GP with horizontal radials, radials drooping 45 degrees and and drooping 85 degrees is 1.42, 2.22, and 3.67 dbi. I would have thought that the 'ultimate' would be when the droop IS 90 degrees (ie essentially a sleeve dipole). With a droop of 90 degrees, is the gain slightly more than 3.67? You can't physically have a 90 degree droop. The radials would have to extend horizontally for some distance, then drop to 90 degrees. That is a different antenna. How come that you can have a 1/4 wave radiator groundplane type of antenna with a gain that is more than a halfwave dipole (2.15 dBi) -even if it is more-or-less a sleeve dipole? When the radial droop approaches 90 degrees it really isn't a GP antenna anymore, it is something else. -- Jim Pennino |
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