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Old September 30th 06, 07:25 AM posted to rec.radio.amateur.antenna
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First recorded activity by RadioBanter: Sep 2006
Posts: 33
Default Rhombics



Dollar for Dollar DB for DB i would errect a Curtain antenna. It
outperforms Rhombics in all aspects of design and construction.


Well, I don't know much about curtains but VK3ATN apparently had one up
and preferred his rhombics. Don't know the full details though.


If you want an opinion of a station who has used and is still using
stacked rhombics ask Ian VK3MO. He will tell you thats his 6 wavelength
perside rhombic is a terrible general purpose antenna. Since his
antenna is fixed on new York he finds that quite frequently the
propagation path rarely comes in on the direct computed bearing. He
loses 10 to 20 db having his sharp rhombic. His rhombic does not have
sufficient azimuth diversity since the 3db horizontal beamwidth is so
narrow.


That's a problem, which is why I had thought of only 4 wavelengths per
side. NEC says it would be about 15 degrees wide on 20m.


You also wont have the problem of finding a termination resistor, a
decent globar one anyway.


I was going use it unterminated to begin with. Aimed at Europe, the
other end points at Central America so I'd be surprised if I had
problems covering both those areas at the same time.

Alan



 
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