FM Radio
Updated February 23, 2017 | Factmonster Staff 
The Question:
When did FM radio begin?
The Answer:
Howard Armstrong broadcast the first radio transmission employing frequency modulation (FM) in 1935. However, experiments with FM had been conducted years before. For more information on frequency and amplitude modulation, check out our encyclopedia.
You can also find a good online history of FM radio here.
-The Fact Monster
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