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Homework Help: Improving reception from a transmitter

  1. May 17, 2009 #1
    1. The problem statement, all variables and given/known data

    I need some points on how one would improve reception from a transmitter. The frequency of the transmission is originally 1GHz.

    3. The attempt at a solution

    Would deceasing the transmission frequency improve reception? Any other pointers?
  2. jcsd
  3. May 17, 2009 #2
    This has not much to do with frequency. Better antenna, and LNA will improve reception considerably.

    If you are in a submarine underwater, then you are constrained to use ULF frequencies (ultra low) because higher frequencies are absorbed by the water. Also at 23 GHz and 60 GHz there is a signal absorption from water vapor and oxygen in the air.
  4. May 17, 2009 #3
    Tell us a little about your link. What have you tried so far? What kind of antennas does it use? How much power is your transmitter putting out? What kind of modulation are you using? How far away is your receiver? Do you know the sensitivity of your receiver?

    Usually frequency is a given, not a variable. What is the purpose of your link?
  5. May 18, 2009 #4
    Its a hypothetical question, a transmitter has been attatched to an elephant and it is being used to track the elephant.

    Thanks for your help!
  6. May 18, 2009 #5
    It's a trade off. Lower frequencies cover longer distances for the same power but require larger antennas. The optimum frequency would depend on factors such as the range, how long you expect the transmitter battery to last, what percentage of the time the transmitter is transmitting and so on. Is your receiver stationary or mobile? Often the mobile receiver uses a directional antenna to determine the direction of the transmitter.

    I'm sure these devices already exist. You might investigate what frequency they use.
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