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Difference in TRX level of main & diver

Viewing 15 posts - 16 through 30 (of 34 total)
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  • #43444 Reply
    patrick
    Guest

    TRX work with RX. Rx div serves only for increasing the sensibility with mobile phone.

    if you deconnected rx div, there is no alarm. It is just for a best quality of communication.

    #43445 Reply
    Tag
    Guest

    Hi patrick

    If i disconnect Rx main i suppose there will be no alram as well,as i still have the rx div path right?

    As for the Rxl path vs the Rxl div path,the system will compare both the signal receive and chose a better rxl level for the uplink?

    Am i correct?

    Please advice.

    Thanks

    #43446 Reply
    areeba
    Guest

    No
    if you disconnect the main the TRXs connected to the main will be disabled(VSWR), & the TRXs which regard the disconnected path as div will be operated but with no diversity gain.

    #43447 Reply
    patrick
    Guest

    On ultrasite:

    during commissioning, the ultrasite check rx ad div. If it detected both, there is comparison.

    If you have only one, ultrasite use it without div.

    It is very important to have a good ROSS feeder before to do a commissioning.

    #43448 Reply
    Patrick
    Guest

    7604 BTS OPERATION DEGRADED
    Rx levels differ too much between main and diversity antennas.

    Example:
    Alarm, you can have if you have a problem on the ROSS feeder.

    #43449 Reply
    Tag
    Guest

    Thanks guys,

    So if we do not have rx diversity antenna.Can i said there will be no comparsion and no divversity gain?

    Pls advice

    #43450 Reply
    patrick
    Guest

    Yes, no div, no comparaison.

    Utrasite detect RX DIV during commissioning.

    #43451 Reply
    areeba
    Guest

    if you havnt diversity ==> no diversity gain.
    So no comparison.
    And your link palamce will be different ,Cuz you havenot Div gain in Uplink.
    so you have to check link palance if it UL limited & no Div ===> you have to decrease DL (BTS power).or insrease UL (Div or TMA)

    #43452 Reply
    nassim
    Guest

    Dear All
    this problem can accour when you have difference between the main and diversity RSSI ( TRX level in the same sector)and this difeerence its more then 3db , and the problem in this case maybe in your TRX or feeder or connector so you have to check with site master ( VSWR, and DTF)
    DTF should be less than 1.05 in connector and 1.03 in the feeder

    #43453 Reply
    ryo
    Guest

    Hi my name is Ryo from Indonesia, I’m new in BTS Nokia Technology,I have alarm 7604 BCF Degraded ‘Rx levels differ to much between main and diversity’ but I already did the sweep test but I think the result is good.I guess the problem comes from the TRX because I can’t do TRX test, it showed ‘RX cabling is faulty or missing’.Is that causing the alarm

    #43454 Reply
    R Mtnez
    Guest

    In practice, having no diversity (watching statistics of site) won´t affect much the quality of service. in Theory with diversity you gain 3dB ir RX, that means you correlate the 2 paths
    saluts.

    #43455 Reply
    RAMI
    Guest

    Hello,
    Concerning diversity, there are several types of diversity and all of them to avoid fading. What I mean to say is that the signal transmitted form the mobile is subjected to scattering, reflections, refractions…etc due to the surrounding terrain. These signals may reach the receiver (antenna in our case) either in phase (constructive) which is good or out of phase which is destructive resulting in a zero amplitude signal level (just like to sinusoidal signals shifted by 180 degrees) . So to avoid such phenomena we need to have diversity and in case you have fading on one path the probability to have the same fading on another one is relatively very small. Moreover, you’ll have a gain of 2-3 dBs in the UL direction only.
    I hope made it clear…

    #43456 Reply
    areeba
    Guest

    #The probability to have such fading through diversity is square the probability of one path.
    #Space diversity is good in rural area, & the other polarization diversity is compatible for urban & suburban (because of dense reflection environment)

    #43457 Reply
    RAMI
    Guest

    you are right areeba, it is good to hear from you whatever is your name. Maybe we know each other!

    Keep in touch

    #43458 Reply
    jr
    Guest

    if you look at the site with bts manager you can go to tools and look at the rssl comparison. this shouold point you to what trx or group of trxs are having the issue. Then you can find out if your issue is a cable or even a TMA of MHA

Viewing 15 posts - 16 through 30 (of 34 total)
Reply To: Difference in TRX level of main & diver
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