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Random Length Longwire Directionality Questions ?
BURR,
IF [Big If] - The Transmitter is using a Mono-Pole Vertical Omni-Directional Antenna; and the right frequency; plus a given skip pattern (number of hops) is just right: Then the North Pole (shortest route) should be the best for the strongest signal. BUT - Most of the time International Shortwave Broadcasters use directional antennas to BEAM a Signal to a specific area or region. * If the signal is Beamed over the North Pole: Then that is the signal that you will usually receive the best. * If the signal is Beamed from the East to West: Then that is the signal that you will usually receive the best. Any "Random Wire" Antenna will have some frequency that it is One (Full) Wave Length (WL); 1/2 WL; and 1/4 WL long. For each of these frequencies the antenna's transmission and reception pattern will very. BUT - In general the common random wire antenna which is less than 35 Feet Long and less that 20 Feet High is considered Omni-Directional with the majority of its signal coming from high incident skywaves. ~ RHF .. .. = = = Burr = = = wrote in message ... Morning Robert, The way I was told and the way I do it is, I run the wire east/west with an "L" at one end and slope it up/down a little. The reason is, most sigs come over the top of the world from the north to the south. The "L" part gets the few sigs that come from the east/west. As to how long to make it I think 69 feet but I'm not sure. If you get it to long then you get two sigs or a echo. Also the tilt helps with the timing. Burr Grundig's Sat800&650,YB400&FR200 Drake SW8 Scanners BC 895&245XLT Sangean DT110(for Ball Games) Also Have a Clock Radio!!! N35.3582 W117.4157 South Left Coast, U.S.A. Robert11 wrote: Should the main run be purely horizontal, or, perhaps, sloped ? What's the best compromise; want only one antenna. How does the vertical run length, in this case only about 15 feet, contribute ? |
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