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900MHz RSSI Level Meter

Discussion in 'Electronic Design' started by Joe G \(Home\), Dec 2, 2005.

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  1. Hi All,

    I want to measure the RSSI of a selected band

    850 to 950MHz.

    What can you suggest for the front end? Tuned or Selective filter?

    What can you suggest for the RSSI part?

    GSM Phone modulation scheme?


    No modulation decoding is required.

    Regards
    JG
     
  2. Mark

    Mark Guest

    what levels are you talking about...

    i.e. are you feet away from the transmitter or miles?

    Mark
     
  3. OK

    The transmitters are 1watt EIRP and 4watt EIRP

    Distance from the TX's will be 10cm to 10~50 metres.


    Output result will be calibated Field strength.


    JG
     
  4. Guest

    Just off the top of my head, I think you'll have quite a bit of trouble
    with dynamic range given how close you want to get. You might have to
    have some attenuators switched in up close, and switch them out as you
    move further away.

    I work with stuff that's in the 25mW range at a bit less than 900MHz
    (designed/advertised as having about a 100m range - of course the
    usable range is considerably more than that) and near field problems
    are always a bone of contention for us under ~30cm.
     
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