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On Thu, 31 Aug 2006 01:32:40 GMT, Ron Hardin
wrote: I have eight antennas combined in 7 ANC-4's. If you use the two serious antenna approach, you simply steer a null onto the noise source. Unless the desired signal is in the same direction, it's not cancelled. Depending on the separation and orientation of the array, it may even be enhanced (in a peak of the pattern of the phased pair) while the noise is eliminated (in a null of the pattern of the phased pair). Generally a quarter wave of separation is good, giving you a peak at one endfire while you have a null at the other endfire. In general the null will be a V pattern that you sweep from one endfire, opening up at broadside to a line, and closing at the other endfire, as you tune the phasing and gain. And more generally than noise sources, you can cancel out a local broadcaster and listen to what's under it, by steering your null onto him, though it can be a tricky adjustment, since you need an insanely deep null, so you're dealing in fractions of a degree. You should point out your antennas are active verticals of the Dymek DA-100E type. It's not possible to steer an array of random wires with any precision. http://www.universal-radio.com/CATALOG/sw_ant/0328.html |
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