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On Sat, 17 Apr 2004 18:14:58 GMT, zeno wrote:
I am getting ready to put up my masts (5 of them) for a 160m full wave loop. For the most part I am using recycled telescoping tv masts which will be up around 50+ feet. Hi Bill, You are on the threshold of being able to do much more for slightly more effort. Let's suppose you use wire with insulators to break them up (generally only advised as a must below tower mounted beams so that opportunistic resonances don't mess up directionality and tune). Further, let's suppose all wires at the top have a good metal connection to the mast. Further, let's suppose each of these wires is broken such that the first insulator(s) is more than 25 or 30 feet above ground (straight down, I am not measuring along the wire). Nothing else matters beyond what you would then do for general construction. I presume that all masts are driven into the ground (or at least are not insulated from ground); and that at each mast you could build a radial ground screen of eight to a dozen wires as broad as those first set of insulators are out from the mast (probably 20 to 30 feet each). You then have the opportunity of developing four broadband vertical antennas (each with a gamma feed because of the grounded situation). There's a good chance they would operate on 80M without too much effort (you might push them to 160). Most of the work is in the top connection, and the first set of insulators - beyond that no commitments are needed if you simply decide to walk away later. That is easy with little difference in the up front effort. 73's Richard Clark, KB7QHC |
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