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The following is a list of radio stations in the United States that are authorized to run 50 kW (50,000 watts) of power. This is the highest power authorized to any AM station in the United States. Power Legend: U=unlimited time, D=daytime power, N=nighttime power, CH= critical hours power.
C. Crane's first electronics product was the "Select-A-Tenna", an antenna manufactured by Intensitronics Corp. of Hales Corners, Wisconsin, for long-distance reception of AM radio broadcasts. The company advertised on late-night radio shows, which served to increase business from AM listeners looking for a better antenna.
AM broadcasting is radio broadcasting using amplitude modulation (AM) transmissions. It was the first method developed for making audio radio transmissions, and is still used worldwide, primarily for medium wave (also known as "AM band") transmissions, but also on the longwave and shortwave radio bands.
Most United States AM radio stations are required by the Federal Communications Commission (FCC) to shut down, reduce power, or employ a directional antenna array at night in order to avoid interference with each other due to night-time only long-distance skywave propagation (sometimes loosely called ‘skip’). Those stations which shut down ...
At the lower end of the spectrum, a portable radio with a larger-than-normal internal ferrite core antenna designed for long-distance AM radio reception may be used, such as the discontinued GE Superadio, CC Radio, or the Panasonic RF-2200. The Sony ICF-SW7600G and the newer GR model are also excellent for budget minded MW dxing.
Low-power AM stations located on a school campus are allowed to be more powerful, so long as their signal strength does not exceed roughly 14 to 45 μV/m (microvolts per meter) (depending on frequency) at a distance of 30 meters (98.4 ft) from campus.
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