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#11
December 29th 08, 01:49 PM
posted to rec.radio.shortwave
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Shortwave Radio Listener (SWL) Antennas -versus- Amateur Radio Antennas
In message , Dave
writes Telamon wrote: In article , Dave wrote: John Smith wrote: However, in side-by-side comparisons on 10-6-2m antennas I have built, comparing a 5/8 against the 1/2 (construction methods/materials and matching components identical) ... the actual difference, in the real world, must be less than the width of a meter needle in the readings ... or, put simply, I no longer deal with the extra length required of the 5/8 ... your mileage may vary ... The advantage of a physical height (antenna length) between 180 and 215 degrees (see previous post regarding the magic number being around 195 degrees) is improved take-off angle and reduced skywave-groundwave interaction, not dramatic nearfield voltage increases. Regarding Mr. Smith's comments above my experience and others is the opposite. 5/8 is a much better performing antenna than a 1/2 wave for local VHF and UHF communications. Well worth the effort to build a 5/8 wave antenna over a 1/2 wave. The 5/8 had some kind of series load coil part way up the whip where the 1/2 wave match/compensation was done at the base so the whip was solid. Sorry I can't more specific then that as those experiments were many years ago. Mr. Smith is still lost in space. 5/8 wavelength antennas do not require a ground plane, do they? Oh yes they do. -- Ian |
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