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Tiny FM Radio Chip

Discussion in 'General Electronics' started by mv, Nov 19, 2003.

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  1. mv

    mv Guest


    I bought a tiny FM radio (made in China!) that has a chip in it

    The Chip looks like SDC 304M (Cant make out exactly) and has digits
    The rest of the radio contains the amp, coils and capacitors.

    Now, on to my problem - The radio has "Reset" and "Scan", the radio
    was probably manufactured for use in the US so the FM Frequency
    increments are different from those used here in India. This means bad
    reception. How can I fix this? Lots of people will be very pleased if
    they could get better sound from these nifty devices.

    Thanks in advance.

  2. Andre

    Andre Guest

    Replacement of the tuning tank coil should fix the problem. :) this
    sounds like it is tuned by a tuning diode.

    You will need :- a spectrum analyser , coil winder, etc. Or just use a
    frequency counter to tune the thing :)

  3. Ken Taylor

    Ken Taylor Guest

    The OP has problems with the frequency steps, not the band. The US steps on
    the even digit (ie. 90.2, 90.4, etc) whereas the real world - I mean, rest
    of the world - uses the odd frequency.

    You can buy devices to do a conversion for you, such as:
    but it probably costs as much as the OP's radio (and is doubtless twice as
    big!). Short answer - unlikely to be able to be done.

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