doubt

Discussion in 'Wireless & RF Design' started by whale, Dec 28, 2008.

  1. whale

    Thread Starter Active Member

    Dec 21, 2008
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    i want to build a wireless circuit, the distance between transmitter and recever is about 50 feet.
    which freequency can i choose for communication .
     
  2. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    You may want to consider off-the-shelf receiver and transmitter modules. They come in several frequencies (i.e. 433 MHz, 915 MHz). You can check out the wireless remote modules at www.rentron.com.

    hgmjr
     
  3. whale

    Thread Starter Active Member

    Dec 21, 2008
    111
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    what is shelf receiver?
    in fact i'm going to build the transmitter and receiver circuit after knowing the exact freequency
     
  4. mik3

    Senior Member

    Feb 4, 2008
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    63
    Of the shelf means a ready one from the market.
     
  5. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    This is a link to the rf wireless page at rentron's website.

    Off-the-shelf is just a term used to refer to predesigned modules.

    hgmjr
     
  6. whale

    Thread Starter Active Member

    Dec 21, 2008
    111
    0
    i want to build my own circuit
     
  7. mik3

    Senior Member

    Feb 4, 2008
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    You have to use a frequency which is not used by other things (radio stations etc) as not to cause interference between their signals and your signals. I think 27 MHz will be fine because it is a frequency used in toy remote control cars.
     
  8. whale

    Thread Starter Active Member

    Dec 21, 2008
    111
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    sir,is there any table for distance and freequency,
    is that wavelength is related to it?
     
  9. mik3

    Senior Member

    Feb 4, 2008
    4,846
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    I don't know much about telecommunications but i know that waves travel better in some materials at some particular frequencies. Now, if you want to transmit signals more far you have to increase the power of the transmitter.
     
  10. whale

    Thread Starter Active Member

    Dec 21, 2008
    111
    0
    thank you....friend(just now i saw your profile)
    see you later
     
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