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Microwave Doppler detector

Discussion in 'Electronic Design' started by [email protected], Oct 13, 2007.

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  1. Guest

    Dear all,

    I have bought a microwave Doppler detector to evaluate the detection
    distance. However, I find that its detection range is not as good as
    its claim, which describes that it can detect thieves outside the
    house through the door, and can be used to compute car velocity. I
    found that the free air space range is only about 1m using the CRO to

    The specification can be downloaded at here: Sensors Modules

    Do I need to add external circuit to amplify and/or filter the output
    IF signal?

  2. Phil Allison

    Phil Allison Guest


    ** Google Groper Alert !!

    ** As the " typical " output signal is only 200uV - you WILL need some
    amplification and processing.

    An op-amp ( like the NE5534) wired as a LPF with 100 to 100 times gain of
    should be a boon.

    ....... Phil
  3. Phil Allison

    Phil Allison Guest

    "Phil Allison"

    ....... Phil
  4. cell

    cell Guest

    I still cannot achieve the distance 20m as describe in the
    specification. In the datasheet it mentions to use pulse style supply
    voltage. Is it the key?
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