Yes, Don ... you are totally correct. For some reason I was thinking about a full wave antenna fed at the 25% point (I have built such antennas before), which looks like two colinear half waves fed out of phase. The current phasing along the antenna would indeed be much different and give a cloverleaf pattern if it were end fed. I wholeheartedly apologize for any confusion I may have created.
73 and thanks for catching my mistake. Dave AB7E On 8/24/2011 3:23 PM, Don Wilhelm wrote: > Actually Dave, a full wavelength wire will have a " 4 leaf clover" > pattern - that is neither broadside to the antenna, nor off the ends. > Check out the pattern for a 1 wavelength long wire in the ARRL Antenna > Book. The maximum radiation is about 28 degrees from the wire - the > radiation from the end is almost zero. > > The elevation angle of maximum radiation is similar to a half wave > dipole - about 15 degrees with a lesser lobe at 45 degrees (that is > for a wire 70 feet high, at lower heights, the angle will be greater). > > 73, > Don W3FPR > > On 8/24/2011 5:34 PM, David Gilbert wrote: >> >> I'm not sure I see the advantage. A full wave end fed antenna would >> theoretically have the same very high feedpoint impedance, and would >> additionally blow most of it's radiated energy at a fairly high angle >> off the ends of the antenna instead of broadside at a lower angle. If >> you find it that easy to tune, I suspect that electrically it really >> isn't that close to a full wavelength ... possibly because of coupling >> to earth (if it is low) or nearby structures. Either that or there is a >> lot of loss in the system somewhere. >> >> 73, >> Dave AB7E >> > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
