FM Limitation

Discussion in 'General Electronics Chat' started by dhivyaraman, Jul 14, 2007.

  1. dhivyaraman

    Thread Starter New Member

    Jun 8, 2007
    7
    0
    Why the FM is limited to 88MHz to 108 MHz?
     
  2. recca02

    Senior Member

    Apr 2, 2007
    1,211
    0
    perhaps because other frequency ranges are reserved for other signals.
     
  3. jasonhaykin

    Member

    Mar 8, 2007
    23
    0
    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.
     
  4. JoeJester

    AAC Fanatic!

    Apr 26, 2005
    3,373
    1,164
    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.
     
  5. mrmeval

    Distinguished Member

    Jun 30, 2006
    833
    2
    It was selected so as not to interfere with existing bands. That range of frequencies has changed drastically in it's history.

    http://en.wikipedia.org/wiki/FM_radio

    If not for rock and roll we'd still all be listening to AM.
     
  6. Gadget

    Distinguished Member

    Jan 10, 2006
    613
    0
    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.
     
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