An Engineer Analyzes the How and Why of Frequency Modulation

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An Engineer Analyzes the How and Why of Frequency Modulation

by KirtB » Wed Jul 26, 2017 10:26 pm

An Engineer Analyzes the How and Why of Frequency Modulation, July 1941 Radio-Craft

Here is the first of a two-part article on frequency modulation. FM was a very welcome option for entertainment radio listeners who had grown weary of static mixed in with their music and syndicated adventure, drama, and comic programs like The Green Hornet, Lights Out, and The Life of Riley, respectively. Amplitude modulation is susceptible to all sorts of interference from car ignition systems, arcing in electric motors, light switches being turned on and off, lightning, and a host of other sources. A commercial radio with good noise and adjacent channel rejection was relatively expensive. Permanent magnet speakers did not become a standard feature for first few … http://www.rfcafe.com/references/radio-craft/how-why-frequency-modulation-july-1941-radio-craft.htm

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