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V antenna paterns
On Fri, 9 Jul 2010 14:08:17 -0400, "Ralph Mowery"
wrote: For many it is difficult to get an antenna up more than 60 feet. That is close to 1/4 wavelength or less. My back yard has trees on each side and it was easy to string a dipole close to 60 feet on the ends,but no way to support the antenna in the middle. That was why the question of should I string the dipole as tight as possiable with out breaking or adjust the drop in the middle to some optimum distance for what I want to do. I sort of thought the mort horizontal it is the beter the signal would be at a distance, but there may be an optimal angle to have a 200 to 300 mile antenna. Hi Ralph, John's suggestion of using EZNEC in its free version would easily answer all the questions, test all the assertions, and find all the unstated characteristics in one fell swoop. It would also let you find the necessary attributes to obtain your goal. EZNEC would do all this faster than the 12 blind men trying to describe an elephant. However, as for your several questions above. You are not going to discover gold at the end of the rainbow by tightening the droop. In fact, getting it to an optimal height (as has been hammered home several times as a principle necessity) won't budge your distant contact's S-Meter more than a couple dB (about the width of the needle). 73's Richard Clark, KB7QHC |
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