rf 433 problem with arduino

Discussion in 'Embedded Systems and Microcontrollers' started by kuannygohcheetatt, Nov 29, 2014.

  1. kuannygohcheetatt

    Thread Starter Member

    Oct 31, 2013
    61
    0
    why my rf433 only can transmit within a short distance like a length of ruler?
     
  2. MikeML

    AAC Fanatic!

    Oct 2, 2009
    5,450
    1,066
    How big an antenna on the transmitter?

    How big an antenna on the receiver?

    To get any reasonable range, both of the antennas must be a full-length half-wave center-fed dipole at 433megHz.

    dipole length = 3e10/(2.05*433e6) = 27.7cm

    Using full size dipoles, I get a range of >200m using the cheap Ebay 315MHz modules.
     
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