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GPS antenna?

Discussion in 'Cell Tower Hunting Club' started by Der84, Oct 30, 2010.

  1. Der84

    Der84 EH!
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    I've always wondered. Is it just cell sites that have the small GPS antennas or can other communication towers/radio towers have the GPS antennas too?
     
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  2. RadioRaiders

    RadioRaiders RF Black-Belt
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    Any tower can have a GPS antenna. Usually they are used for timing synchronization of different elements in a network.

    Since the tower is usually stationary, there's not much need for updating the location...well, maybe if there's a hurricane and it blows down the street the GPS will make it easier to find ;)
     
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  3. JohnCena83

    JohnCena83 New Member

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    If it is very close (< a metre??) , the module could be re-radiating. The signal and it is being picked up by the patch antenna, causing overload and signal distortion. You may be able to confirm this by
    experiment. eg. shielding the module, moving the antenna around. A normal one ohm resistor could have enough inductance (a few nano Henries) to significantly attenuate the 1.5GHz signal.
     
  4. Jonathan Kramer

    Jonathan Kramer Telecom Atty/RF Engr.
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    Late reply...sorry...I've been away for awhile.

    GPS is used in many industry segments, including radio and TV broadcast; multipoint one way; networked two-way radios, etc.

    The key is that if you have a need to sync the transmitter/receiver to a larger digital network, the easy way is to using the timing signals available from the GPS constellation.

    jlk
     
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  5. Yankees368

    Yankees368 Compulsive Signal Checker
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    Welcome back JK!
     
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  6. rfhunter

    rfhunter New Member

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    GPS as far as telecommunications it typically used for time synchronization as stated earlier. Unless they are getting time synch from a stratum clock (which are considerably more expensive) it's likely that most if not all sites are converted or built with GPS antennas.

    These are not only used for radio equipment but other tech industry uses like fiber and video.
     
  7. they also are used for Location based services (911) as well.
     

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