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Two antennas Placement

Viewing 15 posts - 31 through 45 (of 59 total)
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  • #42232 Reply
    Georges
    Guest

    Guys, Does anyone knowWhat is the frequency separation formula between 900 and 1800 to avaid modulation between the 2 layers. Thanks

    #42233 Reply
    Ahmed
    Guest

    I can use passive repeater for GSM mobile phones,But I don’t know which type must be use,if its unpossible, I can use active repeater? please help me

    Best Regard

    #42234 Reply
    Ahmed
    Guest

    can anybody tells me what is the meaning of Gaussian minimum shift keying(GMSK)in GSM network?

    #42235 Reply
    SAMBIT
    Guest

    Hii GMSK is a modulation

    #42236 Reply
    Ahmed
    Guest

    Hi SAMBIT,I konw the GMSK is a modulation but my question mean in which method it work, it’s like PSK or BPSK or what??

    Best Regard

    #42237 Reply
    Sambit
    Guest

    Gaussian minimum shift keying or GMSK is a kind of continuous phase frequency-shift keying. The baseband modulation is generated by starting with a bitstream 0/1 and a bit-clock giving a timeslice for each bit. This is the type of modulation used in Global System for Mobile Communications (GSM) – although that system includes differential encoding of the bitstream, which makes the overall modulation behave like a kind of continuous phase Binary Phase Shift Keying with constant envelope.

    #42238 Reply
    Arsal
    Guest

    Hi All,

    What should be the prefered front to back ratio of 65 deg high gain GSM Antenna & why?

    Thanks

    #42239 Reply
    Paul Fleming
    Guest

    Could anyone please explain what is meant by 30bd separation in regards to dual and triband GSM RBS antennas. I do understand the need to avoid interference but how is it done?

    #42240 Reply
    shelly
    Guest

    Hi
    Can anly one tel me about AM,FM,PM or name the book which defines the these terms in complete discription.
    Thanx

    #42241 Reply
    Ahmed
    Guest

    Dear Friends
    My network now work under GSM900 and GSM1800 if my company supported CDMA what is devices must be replaces,whay?
    Best Regards

    #42242 Reply
    Pix
    Guest

    It depends on your vendor, but normally you can’t reuse any of your GSM network elements in a CDMA network… Maybe you can reuse the antennas if it’s in the same frequency band 🙂

    In best case, you can also reuse the BTS cabinet, and fill it up with CDMA equipments…

    #42243 Reply
    yash
    Guest

    how could we define the antenna direction

    #42244 Reply
    Pix
    Guest

    Antenna orientation is the azimuth facing the antenna (north = 0, south = 180, etc), where the gain of the antenna is maximal.

    #42245 Reply
    Ahmed
    Guest

    Dear colleagues
    if a mounting two antennas for GSM900 one of each in high 20meter and the other in high 45meter but in same direction and used same band (900MHz),do you think may be happen interference between them,why?
    Best Regards

    #42246 Reply
    Pix
    Guest

    Hello Ahmed,

    With 25m of vertical separation, you will not experienced interference, unless you use the same GSM900 channels (co channels or adjacent channels).

    There is absolutely no problem here…

    Regards,
    pix

Viewing 15 posts - 31 through 45 (of 59 total)
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