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RF signal strength

Discussion in 'Radio and Wireless' started by wdariusw, Dec 18, 2015.

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  1. wdariusw

    wdariusw

    149
    7
    Nov 10, 2014
    Hello. I have my car remote key, and there is strange thing. If PCB is in key fob (original, plastic), car remote work in about 2 metres. If I'm holding PCB in my hand, remote works from 20 metres. Whats is bad here ?
     
    Last edited by a moderator: Dec 18, 2015
  2. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    Nothing bad. When holding the PCB in your hand, your body works as an antenna, thus increasing the signal strength compared with the very small antenna on the PCB when in the key fob.
     
  3. wdariusw

    wdariusw

    149
    7
    Nov 10, 2014
    Or maybe my body is like big capacitor, and if i change capacitor near battery, signal would be better ?
     
  4. davenn

    davenn Moderator

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    1,853
    Sep 5, 2009
    no

    it's as Harald suggested
     
  5. BobK

    BobK

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    Jan 5, 2010
    It is odd that it only works at 2m. I have two cars with remotes and they both work at as much as 30m. Holding they high in the air will also increase the operating distance.

    Bob
     
  6. dorke

    dorke

    2,342
    665
    Jun 20, 2015
    You should also check the remote battery.
    If it only works for 2m very likely it is weak.
    While doing that you can take some good photos and post them.
     
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