radio communication using the audio frequencies

Discussion in 'The Projects Forum' started by edski, Sep 22, 2010.

  1. edski

    Thread Starter Member

    Sep 22, 2010
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    can anyone help me.. the tx and rx
     
  2. tom66

    Senior Member

    May 9, 2009
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    If you broadcasted on the audio frequency range, it wouldn't be radio.

    Additionally, you will probably anger the military of the Phillipenes (and in fact any country) as they use the ultra low frequency range for communication with submarines AFAIK. Interfering with that could get you into a world of hurt...
     
  3. edski

    Thread Starter Member

    Sep 22, 2010
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    hehe. what i mean is, im trying to transmit and receive using the audio frequency range...
     
  4. tom66

    Senior Member

    May 9, 2009
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    Yes, I know. I told you using a tx tuned to an audio range is most likely illegal. It is also impractical for sending a reasonable amount of data.
     
  5. Kermit2

    AAC Fanatic!

    Feb 5, 2010
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    AND a quarter wave length antenna would be many kilometers long.
     
  6. beenthere

    Retired Moderator

    Apr 20, 2004
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    For clarification, could the OP say something about the possibility that this is like two way radio for voice communication?
     
  7. windoze killa

    AAC Fanatic!

    Feb 23, 2006
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    How about using the easiest and cheapest method. Microphone and speaker. One of each at each end and you called call it an intercom.

    Now to be serious. What is your budget? How far do you expect to transmit?
     
  8. windoze killa

    AAC Fanatic!

    Feb 23, 2006
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    PS. If you have eight word questions you are likely to get eight word answers.
     
  9. edski

    Thread Starter Member

    Sep 22, 2010
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    yes . the microphone and speaker maybe..i guess a few meters..
     
  10. edski

    Thread Starter Member

    Sep 22, 2010
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    i dont know about intercom... :)
    can you explain it to me clearly.. thanks
     
  11. Kermit2

    AAC Fanatic!

    Feb 5, 2010
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    IR diodes can be modulated with audio and then the audio can be taken back off @ the receiver and put into headphones or speakers.

    Is it a 'wireless' method you seek?
     
  12. marshallf3

    Well-Known Member

    Jul 26, 2010
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  13. wayneh

    Expert

    Sep 9, 2010
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    Wired or wireless?

    The cheapest wireless solution is a kid's wireless microphone, which broadcasts to an FM radio. Most of 'em are crap but they do work.

    If you want a "public address" type thing with an amplified speaker and a connected microphone, there are plenty of off-the-shelf solutions for that too. Like karaoke machines (not that I know anything about those).
     
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