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RF Transmitter Receiver

Discussion in 'Radio and Wireless' started by jasonchong0, May 26, 2011.

  1. jasonchong0

    jasonchong0

    1
    0
    May 26, 2011
    Hey all!
    I have just constructed a RF circuit to try out. I made use of the T5-434-5V and the R5-434-5-128 transmitter and receiver pair and also the HT12E and HT12D as the encoder and decoder for the transmitter and receiver respectively.

    The schemetic I used can be found on page 6 of this datasheet: http://www.spelektroniikka.fi/kuvat/T5R5-434-5V.pdf

    After following exactly, the circuit does not work. I connected the DOUT of the encoder and the DIN of the decoder directly and it works, which brings me to suspect it's the RF pair that's not working.

    HT12E oscillator resistance: 1M ohm
    HT12D oscillator resistance: 51K ohm

    If anyone has any idea as to why the transmitting and receiving isn't working, your comments would be greatly appreciated!
    Thanks!
     
  2. davenn

    davenn Moderator

    13,347
    1,774
    Sep 5, 2009
    could be anything, most likely a wiring error
    the ccts in the datasheet look very straightforward

    A note at the bottom of the osc freq chart for the decoder states
    "The recommended oscillator frequency is fOSCD (decoder) ~/= 50 x fOSCE (HT12E encoder)"

    with your 1M Ohm for the TX encoder that is is 3kHz for a 5V supply
    your 51k Ohm choice seems correct for 150kHz at a 5V supply

    so lets see a pic or 2 of your construction and see if there are any obvious wiring errors. resize pix to a max of 800x600 and make sure they are sharp and easy to see :)

    Dave
     
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