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Denny wrote:
Tony, you have received a crash course on small loop antennas minus the calculus... Let me make a few comments as a country boy engineer who cannot do fancy math... My thought for you to test the loop+Drake is for you to put out a temporary Beverage as a wire on the ground... Go out to the curb in the wee hours of night and roll out 500 foot of insulated wire on the grass between the curb and sidewalk, match it to the Drake with a 9:1 transformer and a ground stake - a terminating resistor and a ground stake at the far end is a good idea, but can be dispensed with in a pinch...' By flipping back and forth between the wire and the loop you will get an idea of how well, or poorly, the loop is performing... By having everything ready to go to roll it out and then roll it back up you should be able to do this test without the neighbors being any wiser in the morning... A variation of the poor boy Beverage, is a 100' untuned dipole running along the perimeter of your estate, waist high no higher which will be omni directional... It might even prove to be a full time installation given your city constraints... Even those of us in the rural areas have noise problems.. Electric fences, etc.. I have a nasty broad band up through 40 meters noise source somewhere to my NorthEast, which essentially wipes out weak dx from europe for me... It is miles from me and I have yet to locate it... denny / k8do this is a good idea, except I can't go 500 ft in any direction without getting into my neighbors property. Best I can do is about 175ft and that would be into my neighbors property who has some dogs which will at any hour of the day or nite bark until the neighbor comes out to quiet them down. I am in the middle of a cul-de-sac that about 200 ft long. All my neighbors on the other side of the street have dogs. The 2 north and south of me wouldn't give me enough room to put out enough wire to make this test worthwhile and the neighbors behind me are anti amateur radio types. I was here first and had antennas up before they even built their houses but yet I am the bad dude in the neighborhood. FORTUNATELY, I have never been accused of any interference even running 1500 watts. Oh this is a "rural" subdivision so to speak, no curbs no sidewalks. But the lots are 1/3 acre or slightly more. Damn, you give me a good idea and I can't use it. |
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