FM radio waves and radio stations

[coktail]

Hi there. I have a (hopefully) quick question here.

FM radio stations transmit their information by manipulating the frequency of radio waves, but each radio station is assigned to a specific frequency. If the frequency broadcasted by a radio station is constantly changing (to transmit info), how is it that you stay locked into a single station?

I hope that makes sense, and thanks!

 

[sas3]

To modulate the signal FM radio station only use a deviation of 75 kHz from center frequency.

 

[coktail]

Thanks!

 

[skeptic2]

Each FM broadcast station is given a channel width of 200 kHz. As sas3 said the signal varies by up to 75 kHz from the center of the channel resulting in a occupied bandwidth of approximately 150 MHz with a guard band of 25 kHz on each side. Even with the guard band, stations on adjacent frequencies are spaced far apart geographically.