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appreciated. Jerry W0ZD -----Original Message----- From: KEN SILVERMAN [mailto:k2kw@prodigy.net] Sent: Thursday, April 24, 2003 9:48 AM To: Force12Talk@qth.com Subject: Re: [Force 12 Talk] RE: Sigma 5 Height > My conclusion is that if you want a single lobe (on 20m) then a base height > of 5m is about right. At least someone is keeping me honest! Yes, the feedpoint should be up around 1/4 wavelength to maximize one big lobe. TOTAL height for a half wave vertical dipole (which is all I really work with these days) should be no more than 5/8 at the tip. Sorry for the goof. > Although there is a dip in the radiation pattern between the high-angle and > low-angle lobes, I would not go so far as to call it a null as it is > generally less that 3 dB. The null should be much bigger than that. Nulls are formed based on feedpoint height for both vertical and horizontal arrays - the mechanism is the same. Kenny K2KW -------------------------------------------- Force12Talk mailing list provided as a service by Force 12 Antennas, Inc. Force12 Web Site: http://www.force12inc.com To Submit Message to the List: Force12Talk@qth.com To unsubscribe and view the Message Archive: see http://qth.com/force12/list For problems with the list: contact n4zr@qth.com -------------------------------------------- Force12Talk mailing list provided as a service by Force 12 Antennas, Inc. Force12 Web Site: http://www.force12inc.com To Submit Message to the List: Force12Talk@qth.com To unsubscribe and view the Message Archive: see http://qth.com/force12/list For problems with the list: contact n4zr@qth.com |