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Can you ID this antenna
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, Lime Light writes On Jun 23, 11:48*am, Jon Teske wrote: The B&W, which comes in several configuations, is a pretty standard military antenna. We had several of them on various buildings at Ft. Meade, where I worked and I've seen them on military posts all over. Several other commands at Ft. Meade also had them. I've also seen then at some local reserve armories as I drive by them. With an antenna tuner (usually automatic) they can cover the whole HF spectrum. As it is a government issue, it likely can be made by several vendors to government specs and then bid upon, unless there is something so unique about it that it is a sole source contract. *Some of them I inventoried when doing site inventories ( I was a US Dept. of Defense program manager) were, in fact sold to the gov't by B&W which I believe is short for Barker & Williamson who made ham transmitters in the 1950's when I was both a kid and first licensed. I'm not an antenna engineer by any means but someone who was said that essentially is was a sort of hybrid between a Zepp and a folded dipole. The extra spacing contributed to its bandwidth. He said the center had some sort of insulator with a balun transformer. *It was not the most effecient antenna, but could be erected quickly and was packaged with a mast kit for field operations. The military version also had the option of stainless steel wire. Most of the ones I saw were permanently installed. I was always curious about them, but all my projects were receive-only for intercept so I never got to play with them at all. Like to hear more about them. Jon W3JT They're found on the roof tops os US Embassy's as well. If the design incorporates a resistor there will be additional loss, but that is the trade off when you need a multiband antenna that plays well with ALE. We were issued dipoles which had to be retuned with each frequency change through out the day. Sometimes efficiency isn't everything. Do a Google on "T2FD", and you will find lots of information on this antenna. I believe the Cebik did an analysis of it, but his articles are not as accessible as they used to be. -- Ian |
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