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"Dave VanHorn" wrote in message
Cuz it's easier decoupled with it's 1/4 wave radials, and is less likely to have feedline radiation than the funky 5/8 antenna with 1/4 wave radials. In direct comparisons here, the 1/4 GP was a good bit better than the 5/8 with 1/4 radials. Interesting. You obviously have developed a far superior measurement technique than most antenna engineering firms, and maybe even NIST. Maybe so if using a simple antenna switch to A/B test is superior... Your results disagree with pretty much everyone who measures antenna gain professionally, and the ARRL handbooks, but hey they must all be wrong then. No, they do NOT disagree with most who have a clue. BTW, those "results" I gave you with gain numbers were from modeling. Though it's entirely done in the HF spectrum, a pretty detailed analysis is presented he HF? Thats the problem....You can't apply the performance shown on HF, and expect it to pan out on 2m. The decoupling problem will rear it's head on VHF. http://www.cebik.com/58-3.html A good ground, and cleaner near-field space, is easier to come by at VHF and UHF, so I would expect results to be somewhat better than what was seen here even at the high end of the HF spectrum. A good ground is not the whole answer. Decoupling is more important at those higher frequencies. If you google a bit, you'll probably find some articles on converting a CB antenna to a 5/8 2 meter antenna. Why would I need to do that? I already done that before. I've built enough 5/8 antennas to choke a horse. Maybe two or three. Thats why I'm fairly comfortable with what I say. I'd like to ask one question. Have you ever actually compared the two types at the same time using a switch? MK |
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