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#14
October 27th 14, 06:59 PM
posted to rec.radio.amateur.antenna
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Myths and Legends of Antennae
Lostgallifreyan wrote:
wrote in : You do understand that a log periodic is a series of 1/2 wavelength dipoles from the lowest to highest frequency of interest? I do now.  Point taken, this is not a portable thing... I looked very briefly last night before sleep, my (wrong) assumption was that the elements were basically directors using a log scale to compress the effective result into a smaller space... I didn't realise that each was a separate normal sized 1.2 wave dipole. Well, almost... The longest element is 1/2 wave at a frequency slightly below the lowest frequency and the shortest element is 1/2 wave at a frequency slightly above the highest frequency. The taper in the element lengths is described by a log function. The total number of elements and the boom length effect both the gain and "flatness" of the SWR over the frequency range. -- Jim Pennino |
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