This sleek-looking tabletop radio outputs good sound quality, and it has great AM, FM, and HD Radio reception—but all of its bells and whistles come at a higher cost. The Sangean HDR-18 sounded ...
FM radio works the same way that AM radio works. The difference is in how the carrier wave is modulated, or altered. With AM radio, the amplitude, or overall strength, of the signal is varied to ...
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