![]() You can actually see the waveform of the audio impressed on top of the carrier. A carrier frequency (the nominal frequency that you tune to such as "1210 on your AM dial") has its amplitude modulated with the intended audio signal. But first a bit of background.ĪM stands for amplitude modulation. There were, and still are, exceptions, and these are what will interest us most. When FM became popular, for the most part, focus shifted to FM tuner design, and AM sections became a low-cost add-on feature of barely acceptable performance. The hi-fi boom of the '50s became synonymous with the new LP and FM broadcasting, both being pushed by the new component hi-fi set makers. Still, FM wouldn't become a factor until well after WWII and AM sets continued to evolve. AM radio served the nation well, but a desire for greater fidelity and immunity from atmospheric interference got experimenters (specifically Edwin Armstrong) working on the FM process. By the 1930s, the early phase of technology was maturing with superheterodyne radios and receivers being the norm and some great sets being made by communications specialists like Hammarlund and Hallicrafters and by radio set makers such as E.H. Our contributor David Smith (not to be confused with David "Anonymous" or David Rich) kicks things off with this essay.ĪM radio has a long, rich history, with the first commercial U.S. ![]() Granted to quote our text so long as proper credit is given.ĮBay listings that quote us incorrectly or without credit may be
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