communication system (homework)

Discussion in 'Homework Help' started by hassan590, Sep 19, 2012.

  1. hassan590

    Thread Starter New Member

    Jul 16, 2012
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    Why the carrier is always kept at least 10 times higher than the highest frequency of base band signal. Give explanation mathematically / numerically.
     
  2. bertus

    Administrator

    Apr 5, 2008
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  3. WBahn

    Moderator

    Mar 31, 2012
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    What are your thoughts about this? Don't expect us to answer your homework questions for you. We expect you to show an honest attempt and then we will start from there and try to lead you to a correct answer.
     
  4. vk6zgo

    Active Member

    Jul 21, 2012
    677
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    This is more of a useful "rule of thumb",& is not, by any means,universally applied.

    For instance,internally in a TV transmitter,PAL vision signals with video frequency components out to 5MHz are modulated on an IF carrier at 38.9MHz .
    The signal is then up-converted to the required channel.
    Even some of these transmitted channels do not comply,such as Australian Channel 0.
     
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