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Uplink/Downlink Frequencies in GSM/CDMA

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Viewing 15 posts - 16 through 30 (of 63 total)
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  • #36985 Reply
    TOMMY
    Guest

    hey guys, Do you guys know how to design a base station grid for GSM 900 system.

    consider an urban area(small to medium city) having a rectangular shape of length 30km and width 25km. if the available base stations have their radiating powers 3w each, the antenna masts are 30m high, the antennas are omnidirectional, and have their gains of 2dB. assuming that mobile antennas are elevated to 1.5m, and have a gain of 0dB. Assume also that minimum signal strenght is -90dB.

    #36986 Reply
    waleed
    Guest

    for any gsm network you must study the loaded traffic which will be applied on this cell(how many subscribers will talk at the pic power and this measres known by erlangs,and this mission for cell planing group so check for cell planing manuals to calculate how many subscriber will use this sites to consider the size and kind of site needed as macro,micro and pico sites to make hierarashical coverage foe whole area to get best performance

    #36987 Reply
    PRAKASH RAJ BHATT
    Guest

    HELLO GOOD MORNING
    I NEED PROJECT CIRCUIT FOR TELEPHIONE ANSWERIN MACHINE FOR PROJECT PURPOSE.
    HELP ME SIR
    bhatt1prakash@yahoo.com

    ok bye sir.

    #36988 Reply
    mohan
    Guest

    Hi,
    Can anyone tell me whether the US make Samsung A500 CDMA model phone works in INDIA or not?

    Thanks in Advance….

    —-Krishna

    #36989 Reply
    Pankaj
    Guest

    Mohan,

    US works on the PCS (1900 MHz) band and unless the phone supports both PCS as well as Cellular (900 MHz) band (Used in India), the phone will not work. Also you need to check out with the CDMA operator in India if they are willing to provision the phone for you or not.

    #36990 Reply
    Abhisheik
    Guest

    Can someone tell me wether gsm 900 or gsm 180 is used in india?….and why is it that digital modulation is not enough for radio transmission in gsm?….also ..can we send a dgital signal lieka sqarewave pulse via radio transmission without loss?….some please tell me ….really need to know …

    #36991 Reply
    Partha
    Guest

    Abhisheik,
    we have both GSM 900 & GSM 1800 in india.But it depends on the Operator’s Licence.for eg. in Chennai has AirTel(GSM900), Hutch(GSM1800), For Tamilnadu circle AirTel(GSM1800).

    #36992 Reply
    S.Vijay
    Guest

    Hello Partha,

    #36993 Reply
    S.Vijay
    Guest

    Hello Partha,

    What is the freq bands and ranges allocated for CDMA Operators in India ?

    Rgds

    #36994 Reply
    waleed
    Guest

    hi mohan as i know pcs is used in canada only because 900 mhz is used for another uses

    #36995 Reply
    Karthik
    Guest

    Hi all,

    A big doubt. Can anyone clarify??

    We say that each Frequency Channel is separated by 200KHz. So this is the effective Bandwidth.This channel is divided into 8 Timeslots.
    So 1/200KHz = 5 Microsec.

    But if you see that 8 Timeslots constitutes one Frequency Channel, then as far as calculations show:
    1 Timeslot = 0.577ms.
    Which means 8 Timeslots = 4.16ms.

    Can you justify how 5 Microsec can be divided so that we get 4.16ms.

    I give up, how come 5 Microsec = 4.16ms ??????????????

    #36996 Reply
    soumya
    Guest

    Hi,
    I am planning to buy a Nokia 3310 model cell phone from USA. Can anyone tell whether it will work in India.

    Thanks,
    Soumya

    #36997 Reply
    Partha
    Guest

    Hi Soumya
    Nokia 3310 specification says GSM900/1800. So this Phone should work in India.But it also depends from which operator u r going to get the connection fm.

    #36998 Reply
    S.Vijay
    Guest

    Got a Info…

    US Uses 850 MHZ and 1900 MHZ Band for GSM.

    Rgds

    #36999 Reply
    kanika
    Guest

    hi everybody
    i would like to know the various bandwidth allocated to different cellular connections e.g. airtel, nokia, idea etc.

Viewing 15 posts - 16 through 30 (of 63 total)
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