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November 20th 04, 04:35 AM
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"Richard Clark" wrote (Fred) wrote: The question is now what kind of matching transformer (UNUN) do I need to get a good match. Hi Fred, You are shy of a lot of information necessary to respond to your particular needs. So to answer what is left: 1:1 Current BalUn Tuner Adding to Richard's comments, many antenna tuners have a built-in 4:1 Balun in them, some only make this available on certain settings. A 4:1 Balun at the feedpoint of a 70-80' random wire will typically match very easily (on a tuner of course) from 160 meters through 40 meters or above. You can additionally, mount the Balun on the top 12" of an 8' ground rod, and ground one of the two Balun outputs to the ground rod, connecting the other to the wire as a feed. This is one of my very effective antennas, and quiet even in a highly populated area. Industrial Communication Engineers (ICE) also makes a nice matching device with adjustable impedance setpoints where their Balun is automatically grounded and provides lightning protection as well. That device is however for receive-only. Jack Painter Virginia Beach VA |
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