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transmission distance in radio communication

Discussion in 'General Electronics Discussion' started by bhuvanesh, Jun 18, 2014.

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  1. bhuvanesh


    Aug 29, 2013
    i have bought all the components to make radio transmitter and receiver.but i am week at basics i dont know which factor cause effect on transmission.i mean which decides transmission range
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    There are many factors:
    • transmitted power
    • gain of transmittting antenna (including e.g. directionality)
    • losses during transmission (attenuation by obstacles like walls, humidity etc.)
    • gain of receiving antenna
    • sensitivity of receiver
    • robustness of the transmission's coding scheme (AM, FM, QAM, ...)
    • robustness of any higher layer coding (e.g. use of errror correcting codes etc.)
    • accepted signal-to-noise ratio of the received and decoded signal
    KrisBlueNZ likes this.
  3. davenn

    davenn Moderator

    Sep 5, 2009
    losses in feed lines
    and last but not least
    the frequency used ( which probably should be at the top of the list)

  4. shrtrnd


    Jan 15, 2010
    I'm kind of assuming this is an inside your home device?
    A liitle more specific information would help.
    Are you working a signal device like an on-off switch, or a communications device, like your own short-range FM radio station?
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