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minimising cb radio

Discussion in 'General Electronics Discussion' started by donkey, May 14, 2012.

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  1. donkey


    Feb 26, 2011
    My boss has a question that I cannot adequately answer.
    Why can a mobile broadcast a few km to a tower and are so small but cb radio's have issues broadcasting 300metres indoors?
  2. KJ6EAD


    Aug 13, 2011
    The longer wavelengths of CB are more readily attenuated by the building and the shorter wavelengths used for mobile phones penetrate the various spaces between attenuating materials better. The wavelength of CB is something like 37 times longer than mobile phone wavelengths, about like the diameter difference between a marble and a basketball.

    There are other, not insignificant, but highly variable differences having to do with relative susceptibility to interference of AM analog (CB) and FM digital (mobile phone) transmission modes.
    Last edited: May 15, 2012
  3. davenn

    davenn Moderator

    Sep 5, 2009
    and also cell towers use hi gain antennas

    which CB band were you referring to ? 27MHz or 477 MHz ?
    even between those 2 there's quite a difference in comms abilities

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