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Comparison Btw Filter & Hybrid Combiners

Viewing 9 posts - 1 through 9 (of 9 total)
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  • 9th August 2006 at 09:58 #45564
    Michael
    Guest

    I’m presently working on a project that require a deeper understanding of the workings of combiners especially Filter and Hybrid.
    information concerning the characteristics and advantages of one combiner over another is desired.
    thanks

    10th August 2006 at 07:05 #45565
    Pavel
    Guest

    Michael,

    I have good E/// document about combiner solutions with CDU-G for RBS2000. If u are interested – I can send it to your via e-mail(~200 Kb in rar).

    10th August 2006 at 14:23 #45566
    Pavel
    Guest

    COMBINERS

    Combiners are needed to enable more than one transmitter to be
    connected to one common transmitting antenna. Without a
    combiner the output from one transmitter would loop back into
    the output of another since both of them are physically
    connected to the same antenna.
    In GSM, two different TX-combiners can be used: filter and
    hybrid.

    10th August 2006 at 14:23 #45567
    Pavel
    Guest

    FILTER COMBINER
    The filter combiner can combine the output of up
    to eight transmitters. In order to use nine to sixteen transmitters
    in a cell, two filter combiners and two antennas must be used. It
    is a narrow band combiner where the frequency of each of the
    connected transmitters (TRXs) must be tuned by adjusting a
    filter. This is done automatically by the system but nevertheless
    takes some time.
    The total loss in a filter combiner is around 3-4 dB.
    The combiner output is connected to the transmitting antenna on
    top of the cabinet via a Measuring Coupling Unit (MCU) and a
    bandpass filter TXBP.
    The transmitter divider (TXD) distributes the loopback signal
    from the MCU to the different transmitters to enable automatic
    tuning of the filters in the combiner. It also enables Voltage-
    Standing-Wave Ratio measurements (VSWR).

    10th August 2006 at 14:40 #45568
    Michael
    Guest

    The filter combiner i’m used to ( CDU-F) can only combine a maximum of 4 transmiters, is their any enhancement?.My email is michaeog@mtnnigeria.net, i’ll be glad to receive the available document

    10th August 2006 at 14:54 #45569
    Pavel
    Guest

    CDU-G can combine 4 TRX maximum also.
    Unfortunately I don’t remember what is deifference between CDU-G and CDU-F 🙁 If i shall find – im going to post it here.

    10th August 2006 at 14:58 #45570
    Pavel
    Guest

    The only info I have:

    • CDU-F is a filter combiner intended for high capacity solutions.
    • CDU-G can be configured either for high capacity or for high coverage. It is
    a combiner that can be used for synthesizer hopping.

    4th February 2011 at 12:16 #45571
    d
    Guest

    Pavel, COULD YOU SEND E/// document about combiner solutions with CDU-G for RBS2000 TO aodd@ukr.net ?

    4th February 2011 at 13:01 #45572
    anshu
    Guest

    Pavel if possible then plz send me also

    @amitec007@gmail.com

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