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Thread: Ideas for security problem

  1. #21
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    I wonder if these cause any problems with local WIFI routers?
    - Tex
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    "Truth lies dormant in our future history." ― Tex Clodhopper LXV
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  2. #22
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    And cordless phones and garage door openers?

    What Buzby said: It's frequency is neither precise or stable

    What I heard: Poor man's "spread spectrum"

  3. #23
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    Quote Originally Posted by erco View Post
    And cordless phones and garage door openers?

    What Buzby said: It's frequency is neither precise or stable

    What I heard: Poor man's "spread spectrum"
    I have had it on all day and no interference with any of the above. I also have my WiFi laptop right next to the module. Remember, these modules are meant to work with home lighting.

    My radar theory is rusty, what I remember is that the doppler shift in frequency is in audio range. You compare the output frequency with the return frequency and the difference at that short a range is in Khz at most.

    It does not have to be extremely stable because all you are doing is comparing the output frequency with the return echo but it's far from spread spectrum.

    Of course, my engineering classes were a long time ago and I could be completely wrong

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