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asking about dbm flactuation

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  • #60558 Reply

    hello everyone i am working as a transmission engineer for a gsm company
    recently we have a new link between 2 sites and the information are just like bellow
    1-antenna size:2.4 m
    2-radio type RAU2 7 GHz
    3-indoor equipment are MMU 155 e/f by ericsson
    protection mode 1+1
    i have LTU 155 Mbps
    and NPU unit
    i have checked that there is no movement in the dish antenna on the two sites why should the Dbm is flactuating if there is no interference ????? plz help with the possible cases of signal unstability

    #60559 Reply


    Apart from HW issues, you can check
    1- are both rx sides getting fluctuations ?
    2- the polarity of both antennas ? same ?
    3- changing frequencies to see if you are not facing a kind of phase cancellation due to an obstacle around the path..

    i’m not an expert here, just sharing some thoughts


    #60560 Reply

    thanx for your response pix , here i have to explain it more clearly
    first i am sending 2 links by the same antenna I.E i have 2 polaritis V and H with different frequencies, the second thing is i am using XPIC option cuz i have 8 MMUs in the site and 1+1 protection plus XPIC
    pos2,pos3 are V,,pos4,pos5 are H
    on the other side of the equipment i have pos 14,15 H and 16,17 H

    #60561 Reply


    sorry, this is too high level for me… let’s hope someone else can help you out !


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Reply To: asking about dbm flactuation
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