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Ralph Mowery wrote:
"Scott" wrote in message . .. Depends what you want. Are you going to use a small Yagi for FM work or a long boom Yagi for SSB/CW? If you want something fairly simple, a homemade 6 or 8 element Yagi is fairly simple. Otherwise, for some serious weak signal work, the K1FO designs are quite commonly used. Directive Systems sell them... http://www.directivesystems.com/antenna4.htm Hope that helps! Scott N0EDV Now you tell me. I just ordered 2 beams from M-Square, one for 432 and one for 144. Wish I had the K1FO antennas as I had one for 432 and it worked very well. I did not know anyone had picked up the K1FO design after he became a SK. Important correction: Steve Powlishen, K1FO, is NOT an SK! (W9GB had it correct: the person who died was the co-developer W1EJ.) W9GB is also correct that they are excellent yagis, and have been published in several editions of the ARRL Handbook. The most extensive write-up is in the ARRL Microwave Experimenter's Handbook Volume 1. Don't worry, you'll be fine with an M2 yagi as well. There is a lot of convergence between modern long yagi designs, so the state-of-the-art is that products from all the major manufacturers are very close to optimum performance in terms of gain and pattern. There can still be some differences in performance between different brands, depending mostly on the exact balance between gain, pattern and bandwidth the designer was trying to achieve. However, these differences between brands are almost always quite small, so for comparable designs (ie yagis with the same or very similar boom length, of 2-3 wavelengths or more) the difference between brands might only be a few tenths of a dB in terms of gain, and maybe a few dB difference in the levels of minor sidelobes. End users will hardly ever notice these differences on the air, so when choosing which long yagi to buy, you can pay more attention to other important factors, such as overall size, style of construction, suitability for your weather conditions, price and dependable product support. [I could write a lot more about "optimized" long yagis, but not this morning. There's more information in the 'Long Yagi Workshop' section of my website.] -- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3sek |
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