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DIGITAL SIGNALS in ANTENNA

Discussion in 'General Electronics Discussion' started by baranidaranp, Jul 6, 2011.

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  1. baranidaranp

    baranidaranp

    2
    0
    Jul 5, 2011
    Dear friends,

    I have one qustion....

    why can't we use digital signals in antenna?

    i mean that we are unable to propagate the digital signals through an antenna. why?
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,501
    2,841
    Jan 21, 2010
    Your answer could be answered several ways.

    Firstly, if you are talking about low frequency signals, then you have a similar issue as to transmitting audio. That is, we modulate a carrier. A simple digital example of this is morse code.

    If you're talking about the carrier, then the reason we don't use a square wave is that we want to be as efficient as possible and cause the least interference. Square waves contain the fundamental frequenct plus a whole series of harmonics. Just using the fundamental frequency (a la a sine wave) is best.
     
  3. davenn

    davenn Moderator

    13,947
    1,987
    Sep 5, 2009
    you need to clarify what you are trying to ask much better, give us some context of your question

    digital signal RF transmission from antennas is happening all day every day worldwide

    eg.... TV, Radio, mobile phones, transmissions to and from satellites and spacecraft orbiting other planets, WiFi from your laptop to the router.... just to name a few

    Dave
     
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