Have some question for RF module

Discussion in 'Embedded Systems and Microcontrollers' started by Neon2302, Sep 21, 2009.

  1. Neon2302

    Thread Starter New Member

    Sep 21, 2009
    1
    0
    Dear All,

    My name is Chet Chetchaiyan, leaving in Thailand. At this moment, I'm facing a problem of RF 433.92MHz communication.

    Here is the background of my module.

    Transmission
    - using TWS-BS-3 from wenshing for Transter module please see datasheet on Reference1.
    - data sended by AVR microcontroller as serial communication (Tx) directly to TWS-BS-3
    - 5V power supply apply for all devices.
    - I use ~15cm. 24AWG wire as antenna

    Receiver
    - using RWS-374-6 from wenshing for Receiver module please see datasheet on Reference2.
    - data received by AVR microcontroller as serial communication (Tx) directly from RWS-374-6
    - 5V power supply apply for all devices.
    - I use ~20cm. 24AWG wire as antenna.

    Reference
    1. http://www.es.co.th/Schemetic/PDF/TWS-BS3
    2. http://www.es.co.th/Schemetic/PDF/RWS-374-6.PDF


    Here is the Result
    The result of my module isn't meet my requirement. the module can trasmit only a shot range and result vary with out any reason. The example is at morning it can receive data with 5m. range with concrete wall in the middle, but sometimes the range reduce to 2m. without any obstrucle. and later on it can work well again.

    Anyone have experience on RF communication please give me suggestion and/or answer my question for complete this module

    Question
    1. How could I improve communication range and make it more stable. My target range is 10m with concrete wall in the middle.
    2. Can I use HT12E and HT12D for encode/decode the message?
    - Is it increase communication range?

    Thank you for everyone who visit and share your time with my problem

    Best Regards,
    Chet Chetchaiyan
     
  2. BMorse

    Senior Member

    Sep 26, 2009
    2,675
    234
    Try some of these modules from this company>> http://www.linxtechnologies.com, you can find their products at Digi-Key, and don't forget to use the 1/4 whip antennas to get the best range, no need for encoders or decoders if you are transmitting serial data....
     
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