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easy way to boost range of wireless thermometer?

Discussion in 'Electronic Design' started by Jack Rulo, Feb 18, 2007.

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  1. Jack Rulo

    Jack Rulo Guest

    I have a cheap Accurite wireless thermometer from Walmart. Is there any
    easy way to boost the range? I tried lengthening the short wire antenna
    inside the indoor receiver, but this didn't help. Maybe I should have
    lengthened the sensor antenna as well?

    Any thoughts would be appreciated. Right now, I'd say the unit has about a
    30-50' range and I'd like to double that if possible.

    Thanks,
    Jack
     
  2. Andy

    Andy Guest

    You could try placing it on a ground plane. Something like a biscuit
    tin lid should do. Probably won't double range but might get you some
    of the way there.
     
  3. Guest

    Well, it depends on how much of a science project you want to make out
    of this.
    You could add a cheap mini-circuit rf amp 'tween the rf output and the
    sensor antenna.
    A ERA-33SM gets you about 15dB of gain (dc-3000MHz) and only cost
    $1.72
    http://www.minicircuits.com/pdfs/ERA-33SM+.pdf
     
  4. ehsjr

    ehsjr Guest

    Experiment with a corner reflector behind your
    sensor and aimed at the receiver. See
    http://www.northcountryradio.com/Published/cnrrefl_0796/cnrrefl_0796.htm
    to get the concept if it is unfamiliar.

    Ed
     
  5. Rich Grise

    Rich Grise Guest

    Use antennas that are actually cut to resonance, or even directional
    antennas.

    Good Luck!
    Rich
     
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