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#27
October 16th 06, 11:01 PM
posted to rec.radio.amateur.antenna
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Yagi Height Question
Understood
Best regards Art Walter Maxwell wrote: On 16 Oct 2006 13:06:58 -0700, "art" wrote: Walt I said that both antennas are beams. What I was addressing was the height portion of the question whereas tho they are both beams the effective height measurements were different. i.e Planar beam versus other beams where the quad is not a planar beam. Seems like effective height measurements contribute to most yagi /quad comparison debates. There is also another side of the coin when measuring effective ht and that is when a yagi is positioned vertically where it is still planar when comparing to a quad element moved thru 90 degrees.which is now planar. If you chose to answer the posting what part of my posting would you leave out, or question its veracity especially after reading the total thread? Regards Art Walter Maxwell wrote: On 15 Oct 2006 21:35:43 -0700, "art" wrote: Yes there is a difference, A yagi is a planar beam ie on a single plane so the height of the array is the same for all elements in the array which creates a major lobe or beam. If the array is not planar such as a Quad then the elements are at different heights so the true or effective height of a quad antenna which is also a beam style antenna is approximately the center point of the array or somewhere between the top and bottom of the quad element. The point to stand by is that the height of the feed point is immaterial with respect to the effective height of an array. In another post I pointed out that no matter which element is fed in a array the effective height of the array is always the same and thus the TOA is always the same Regards Art Hi Art, One of the most demeaning aspects of this newsgroups concerns misunderstandings of definitions and terminology that often leasd to unfortunate and unnecessary arguments. To wit: Yagi vs beam. It's been my understanding that any combination of radiating elements intended to radiate more energy in one direction than omni establishes a major lobe that is called a beam. In other words, any directional system establishes a beam. Therefore, 'beam' is generic to all directional radiators. It then follows that 'Yagi', 'quad', 'W8JK', 'EDZ', are all 'beams' of a particular type or configuration. XXXXXXXXXXXXXXXXXXXXXXXXXXX I agree, where did I say different? XXXXXXXXXXXXXXXXXXXXXXXXXXX Ok Art, here's the way I saw it: Sal Manela sez: "Before anybody tells me there is a difference between a yagi and a beam, let me thank you in advance." Then you replied, "Yes there is a difference," So Art, my response was only to refute your statement above. I don't dispute your other statements. Walt, W2DU |
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