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FM Radio changing frequencies

Discussion in 'Misc Electronics' started by helius, Jul 31, 2007.

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  1. helius

    helius Guest

    Hi all,

    I want to know how it is possible to change the frequencies on a FM
    radio to get the correct Police or other company/something's frequency
    and listen to them. I live in Macedonia so I think it would be that

    Aleksandar Kiselinov
  2. Don Bruder

    Don Bruder Guest

    Possible? Yes.

    Easily? That TOTALLY depends on the specific radio you're going to try
    to do it to. Some models, it'll be as easy as carefully tweaking a coil
    or fiddling with the tuning capacitor. Other models might require an
    almost complete-from-scratch redesign.

    Basically, you have to move the tuning range from the broadcast FM band
    to whatever frequency your "target" uses. Doing that might be easy, or
    it might be complex, or it might even be impossible, depending on your
    radio's exact circuit details.

    There's simply no way to tell in advance without having detailed circuit
    information on the exact radio you're going to try doing it to.
  3. Sjouke Burry

    Sjouke Burry Guest

    I have done it for my FM radio in the past, when we
    still had NON-encoded police radio just below the FM band.
    The problem was that the FM modulation depth was only 15 KHZ
    instead of the 250 KHZ used by commercial FM stations,
    so the sound was very soft and when turned up, the noise level
    in between transmissions was horrible.
    Today we only have encoded police/ambulance/emergency services.
  4. ian field

    ian field Guest

    A BFO might avoid the need to disturb the radio's internal adjustments.
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