RF communication interference

Discussion in 'The Projects Forum' started by SKChakra, Aug 29, 2013.

  1. SKChakra

    Thread Starter New Member

    Oct 21, 2012
    4
    0
    Hello guys!...There was one clarification that I needed...Here goes...Does an RF 433MHz Transmitter-Receiver pair interfere with an 315MHz RF transmitter receiver pair?...If so, how do I isolate signals (Imagine that I am doing a project where I need two way RF communication but at different frequencies for forward and backward routes,i.e., parallel communication)...If not, as suggested above, can I use them for two-way parallel communication or do u guys have any better idea?...(Other than ZigBee/XBee, etc)



    Thanks in advance, help is much appreciated!
     
  2. #12

    Expert

    Nov 30, 2010
    16,298
    6,809
    That's enough difference in frequency that any well designed pair would ignore the other pair easily.
     
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  3. Papabravo

    Expert

    Feb 24, 2006
    10,144
    1,791
    There is one caveat. A receiver antenna in proximity to a "strong enough" signal on a different frequency may pick up enough energy to overload the front end of a receiver and render it deaf. This phenomena is knows as "desensing the receiver".
     
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  4. analogdesign

    New Member

    Aug 29, 2013
    14
    1
    Quite true, but the difference in frequencies is enough the OP should be able to get or design a passive preselector that will knock those blockers down enough to avoid desensing the receiver.
     
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  5. Papabravo

    Expert

    Feb 24, 2006
    10,144
    1,791
    Separating the antennas, using directional antennas, and watching the power levels will also help.
     
  6. Meixner

    Member

    Sep 26, 2011
    116
    21
    Also use different antenna polarization for each frequency..
     
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  7. SKChakra

    Thread Starter New Member

    Oct 21, 2012
    4
    0
    Will designing narrow band pass filters do any good?
     
  8. #12

    Expert

    Nov 30, 2010
    16,298
    6,809
    Good for what? It seems you already don't have a problem with the radios interfering with each other.
     
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