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infrared transmitters

Discussion in 'Electronic Basics' started by Paul Horwood, Apr 26, 2005.

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  1. Paul Horwood

    Paul Horwood Guest

    I wonder if anyone can help me?

    I am looking at building a 6 band infrared transmitter.
    Now it seems that most infrared beams are modulated via a high signal like

    What I want to do is to transmit all the 6 bands at once but on different
    infrared frequencies.
    The frequencies would be for example:- 935,5 - 937,8 - 927,2 - 948,1 -
    934,2 - 928,3 nm (nanometer) .

    How can this be done?

    Is there a meter that can be used to determin the frequency of infrared

    Or is there a calculation that can be done to determin which components I
    would need?

    Will the standard infrared emitters be capable of narrowed bandwidth like

  2. John Smith

    John Smith Guest

    Why this approach? What are the 6 signals you're transmitting? Are they
    continuous (analogue) or discrete (digital)? What bandwidth?
    After analysing the problem, you might discover another solution e.g. time
    division multiplex.

    To answer directly, I'm not aware of reasonable cost devices. There probably
    are expensive solutions, e.g. using filters, but filters with centre
    frequencies as you've shown (and narrow bandwidth as you've shown) will be
  3. Bob Eldred

    Bob Eldred Guest

    You want to multiplex by optical frequencies? There is no simple way to do
    this. Standard emitters have way to wide a spectrum. It would require Laser
    emitters and even then the wavelengths listed are quite close together.
    Furthermore, it would take advanced optical processing, spectrum analysis,
    etc. to separate the signals when received. But, why do you want to do
    this? Why not multiplex with different modulation frequencies or multiplex
    with time division at a single mod. frequency. You need to be more specific
    about the information you want to transmit and its bandwidth and one of us
    can suggest how you might do it.
  4. Paul Horwood

    Paul Horwood Guest

    You want to multiplex by optical frequencies? There is no simple way to do
    By the looks of it I would need to use infrared filters over the emitters...
    Sounds more complicated than I expected...
    Think I will use another system..

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