101.9 is FM. FM stands for frequency modulation as in how often the radio signal happens every second. FM stations broadcast MHZ (mega hertz) and are those little letters at the end of you radio face plate. M stands for mega which equals millions and hz stands for hertz which is how often a signal is sent every second. All FM stations are im MHZ. In this case the signal happens 101.9 million times per second and that gives it the quality.
Originally Posted by Decimotox
On the other hand all AM stations (amplitude modulation) operate in KHZ (kilo hertz)which is only thousands of times per second. So 660 AM only has a signal that is sent just 660 thousand times per second. Much less quality than a FM station. But AM does have some benefit. It stands for amplitude modulation which means they are more concerned with the strength/ampltiude of the signal and that is why you can usually pick up your favorite AM station many miles from home but your favorite (not so strong) FM station fades away not to far down the highway.
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