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Does anyone know where I can obtain a plot of the antenna pattern for
a major (50,000 watt) commercial broadcast station? www.radiolocator.com (where you'll find it, and any other AM station in the US and Canada) ____________________ The contours shown on Radiolocator.com are based BOTH on the radiation pattern of the transmit antenna system, and ground conductivity along various radials for 360° around the transmit site. If conductivity was a constant throughout the groundwave coverage area of the station (almost never happens), then from the "patterns" on Radiolocator - to the extent they are accurate - you could calculate the actual shape of the transmit antenna radiation pattern, remembering that field strength changes as the square root of changes in radiated power. RF Visit http://rfry.org for FM broadcast RF system papers. |
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