Am radio signals have frequencies between 550 khz
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The Frequencies in this database start at 3000 kHz and end at 30000 kHz. This is the Shortwave frequency Range. Remember, this is NOT a database of Amateur Stations, Utility Stations, Air or Marine Services, etc. In other words, you won't find a listing for 14255 or 1620.
Digital radio has better-quality reception as it uses digital signals and so does not have problems of noise and interference. Microwaves. Microwaves are sometimes considered to be very short radio waves (highfrequency and high-energy radio waves). Some important properties of microwaves are: They are reflected by metal surfaces.