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![]() i am not clear on how this antenna would look, when i think of 2 elements "" phased or simul driven i presumed it would sorta look like a typical beam elements in parrallel spaced apart that being the case , i am not clear on how changing the feedpoint alters the ew ns direction unless of course the antenna is like a cross the gain seemed nice wouldn't mind trying one, my catch is i am using a sgc tuner to feed my present dipole, i suppose i could just take it's output and feed both 'elements' be a neet experiment thanks m Years ago I experimented with two-element beams where both elements were driven. Roy, W7EL, has some BASIC programs on his web page that allows the calculation of phasing harnesses for such antennas. The disadvantage is that one must know the mutual coupling impedance between the two elements. In article , Cecil Moore wrote: Given that EZNEC will output the feedpoint impedances for both elements, for a common class of two-element beams, the mutual coupling impedance can be calculated from the EZNEC data. Assuming the two-element beam consists of two identical center-fed elements and assuming that the feedpoint current magnitudes are equal, one can design the beam to meet certain specifications, obtain the feedpoint impedances from EZNEC, and calculate the mutual coupling to be entered into Roy's BASIC phasing software. Lewell1.bas program available as simpfeed.zip on www.eznec.com. One advantage of a wire beam like this is that the direction of maximum gain can be reversed by changing the feedpoint position on the coaxial phasing harness. Good E-W or N-S beam performance is obtained with one fixed wire beam on the lower bands. -- 73, Cecil, W5DXP |
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