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#1
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This gain figure sounds very much like the 144MMz EME double rhombic
that was in the ARRL handbook for years. As I remember it was "attacked" some years ago for claiming such a high gain. I built one for 70cm some years ago and the results were disappointing, or rather not as good as a 22 el loop quad. I didnt do much experimenting with it sorry. Cheers Bob VK2YQA wrote: I picked up a Oct 1973 issue of 73 & noticed a interesting article on a mast mounted rotatible very |
#2
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Exactly what i wanted to know, i may hold off on this one and search
for a different type high gain uhf antenna. Only problem is all the design programs i have found on the web for yagi or log perodic antennas are for 6-8 elements maximum, @ 900mhz i would like to have as many elements as a boom would support. So my next question would be where to look for a multi element beam using atleast a minimum of twelve elements? |
#3
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Scaling shouldnt be an issue so start by looking at 1296MHz antennas.
You can always computer model them as well. Have a look at Mr Cebiks' website. (http://www.cebik.com) I'd actually recommend you look at a corner reflector. Nowhere as critical as a yagi and pretty easy to build. Maybe even a 3D corner? I've been wanting to try a Sterba curtain (on 900mHz) over a planar reflector. That wouldnt be real critical either. Cheers Bob Vk2YQA wrote: Exactly what i wanted to know, i may hold off on this one and search for a different type high gain uhf antenna. Only problem is all the design programs i have found on the web for yagi or log perodic antennas are for 6-8 elements maximum, @ 900mhz i would like to have as many elements as a boom would support. So my next question would be where to look for a multi element beam using atleast a minimum of twelve elements? |
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