Discussion in 'General Electronics Chat' started by dhivyaraman, Jul 14, 2007.
Why the FM is limited to 88MHz to 108 MHz?
perhaps because other frequency ranges are reserved for other signals.
the frequency band you gave (88-108) is commercial FM.
if you are building a fm related project, you can use any frequency for your transmitter/reciever.
FM commercial Broadcasting is limited to 88MHz to 108 MHz, but FM [Frequency Modulation] is used in alot of other bands.
You can use low power FM in that band, limited to a few hundred milliwatts without a license. All you would need is a quiet spot in the band. 47CFR covers the Telecommunications rules, commonly called the FCC rules and regulations.
You can get a copy of the frequency allocation chart in pdf format.
It was selected so as not to interfere with existing bands. That range of frequencies has changed drastically in it's history.
If not for rock and roll we'd still all be listening to AM.
Land mobile services tend to use the band below 88Mhz, and Aircraft use the band above 108Mhz. Many countrys also put a limitation on output power and transmitter specs near the edges of the FM band (especially at the aircraft band end) to reduce the chances of interference to these services.