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  1. #1
    Hi everyone!!

    I'm courios about some cell site towers where net-like flat sheets can
    be seen to the sides of some antennas (panels). Anybody know what is
    the purpose of this sheets surrounding a panel?

    I'm writing from Colombia (South America), any comment will be really
    appreciated.




    See More: Cell site question




  2. #2
    Frank Harris
    Guest

    Re: Cell site question

    Maybe it works like a reflector to make the antenna more directional or
    like a screen to limit the radiation to the rear or side.

    [email protected] wrote:
    > Hi everyone!!
    >
    > I'm courios about some cell site towers where net-like flat sheets can
    > be seen to the sides of some antennas (panels). Anybody know what is
    > the purpose of this sheets surrounding a panel?
    >
    > I'm writing from Colombia (South America), any comment will be really
    > appreciated.
    >


    --
    Frank Harris in San Francisco with an A680



  3. #3
    John S.
    Guest

    Re: Cell site question

    They are sheilds to make the antenna more directional.

    <[email protected]> wrote in message
    news:1119830446.3582[email protected]
    > Hi everyone!!
    >
    > I'm courios about some cell site towers where net-like flat sheets can
    > be seen to the sides of some antennas (panels). Anybody know what is
    > the purpose of this sheets surrounding a panel?
    >
    > I'm writing from Colombia (South America), any comment will be really
    > appreciated.
    >






  4. #4
    John S.
    Guest

    Re: Cell site question


    "Frank Harris" <[email protected]> wrote in message
    news:[email protected]
    > Maybe it works like a reflector to make the antenna more directional or
    > like a screen to limit the radiation to the rear or side.


    Exactly!

    >
    > [email protected] wrote:
    >> Hi everyone!!
    >>
    >> I'm courios about some cell site towers where net-like flat sheets can
    >> be seen to the sides of some antennas (panels). Anybody know what is
    >> the purpose of this sheets surrounding a panel?
    >>
    >> I'm writing from Colombia (South America), any comment will be really
    >> appreciated.
    >>

    >
    > --
    > Frank Harris in San Francisco with an A680






  5. #5
    Notan
    Guest

    Re: Cell site question

    "John S." wrote:
    >
    > They are sheilds to make the antenna more directional.


    Why would you want a directional antenna?

    Notan



  6. #6
    CharlesH
    Guest

    Re: Cell site question

    Notan wrote:
    > "John S." wrote:
    >
    >>They are sheilds to make the antenna more directional.

    >
    > Why would you want a directional antenna?


    They want a given cell site to cover a particular area, to maximize call
    capacity. With GSM systems, the issue is frequency re-use. With CDMA
    systems, everyone is on the same frequency, so you want to minimize the
    noise (that is, calls other than your own) in a particular location, but
    not have holes with no coverage.



  7. #7
    Notan
    Guest

    Re: Cell site question

    CharlesH wrote:
    >
    > Notan wrote:
    > > "John S." wrote:
    > >
    > >>They are sheilds to make the antenna more directional.

    > >
    > > Why would you want a directional antenna?

    >
    > They want a given cell site to cover a particular area, to maximize call
    > capacity. With GSM systems, the issue is frequency re-use. With CDMA
    > systems, everyone is on the same frequency, so you want to minimize the
    > noise (that is, calls other than your own) in a particular location, but
    > not have holes with no coverage.


    Wouldn't "not have holes with no coverage" suggest an omni-directional
    antenna?

    Notan



  8. #8
    CharlesH
    Guest

    Re: Cell site question

    Notan wrote:
    > CharlesH wrote:
    >
    >>Notan wrote:
    >>
    >>>"John S." wrote:
    >>>
    >>>>They are sheilds to make the antenna more directional.
    >>>
    >>>Why would you want a directional antenna?

    >>
    >>They want a given cell site to cover a particular area, to maximize call
    >>capacity. With GSM systems, the issue is frequency re-use. With CDMA
    >>systems, everyone is on the same frequency, so you want to minimize the
    >>noise (that is, calls other than your own) in a particular location, but
    >>not have holes with no coverage.

    >
    > Wouldn't "not have holes with no coverage" suggest an omni-directional
    > antenna?


    A lot of times they are trying to fill in specific gaps caused by hills,
    valleys, large buildings, and so on. If the coverage area were just a
    nice big perfectly flat area, it would be easy.



  9. #9
    John S.
    Guest

    Re: Cell site question


    "Notan" <[email protected]> wrote in message
    news:[email protected]
    > "John S." wrote:
    >>
    >> They are sheilds to make the antenna more directional.

    >
    > Why would you want a directional antenna?


    Cellular is a "directional" type of service. In order to re-use the same
    frequency in a nother cell the antennas are directional. That is why you
    will typically see 6 antennas (2 per sector/3 sectors) on a cell site. At
    thimes you will see 3 per sector and occasionally more.

    More than 3 per sector typically means that they still have TDMA and AMPS
    which they have moved to another antenna.

    CDMA usually has 2 antennas per sector.





  10. #10
    John S.
    Guest

    Re: Cell site question


    "Notan" <[email protected]> wrote in message
    news:[email protected]
    > CharlesH wrote:


    >> They want a given cell site to cover a particular area, to maximize call
    >> capacity. With GSM systems, the issue is frequency re-use. With CDMA
    >> systems, everyone is on the same frequency, so you want to minimize the
    >> noise (that is, calls other than your own) in a particular location, but
    >> not have holes with no coverage.

    >
    > Wouldn't "not have holes with no coverage" suggest an omni-directional
    > antenna?


    But then the Omni wouldn't allow re-use of that fequency at adjacent cells.
    Cellular was designed with directional antennas in mind.





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