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SteppIR sells a 4th element for 6 on the 3 el yagi and TWO six meter
elements for the 4 el yagi. Yes, someone has modeled this. ;^) H. NQ5H "Ian White, G3SEK" wrote in message ... buddy clark wrote: the beam in my estimation meets or exceeds all advertised specs. the beam does not work well on 6m in my opinion, but my frame of reference for that band was a 5 element on a 30 foot boom. If the element spacing is anything like adequate for 20m, it has to be way too wide to be optimum on 6m. I'd guess there is more performance to be had on 6m by adding a fixed reflector and at least one director at an optimum spacing. Using only the variable driven element and the variable-length director at the end of the boom, that would turn it into a reasonable 4- or 5-element with some dBs more forward gain. You'd lose the 180deg beam reversibility on 6m, but you could quickly remove the front/back ratio by lengthening the director. On the lower bands, the 6m elements would have very little effect. Has anyone modeled this? Part of the trick would be to use a close-spaced first director to keep the feedpoint impedance reasonably close to 50 ohms (see www.cebik.com on Optimized Wideband Antennas). -- 73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB) Editor, 'The VHF/UHF DX Book' http://www.ifwtech.co.uk/g3sek |
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