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Tx Power decrease in ALU GSM BTS

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  • #69767 Reply

    Dear Experts, pls help me solving this problem
    – I found that Tx Power of some sectors in my ALU GSM BTS is different with others, even they have same parameters defined, same configurations
    – I tried to replace TGT, AGC or Suma, checked combiner, TX_Power_attenuation parameter….however, they’re not return to max power like others
    TRE 8PSK Capability ( dbm )
    Sector 1: 44.3
    Sector 2: 39.8
    Sector 3: 39.8
    Please see the pic and give me your advice
    Tks a lot

    #69768 Reply


    that’s a very weird issue… how many trx & TGT per sector ?

    have you tried swapping those TGT from sector 1 to sector 2 ?



    #69769 Reply

    Tks Pix for reply
    We’re using twin TRX of ALU ( GSM ) 2/2/2 configuration
    I tried to swap TGT, AGC , but no hope
    Many sites in my networks faced with this problem, TX decreasing. Some cells after HW audit ( BTS on/off again ) are return again max power, but the others are not
    All of them have same PC defined parameters

    #69770 Reply

    what a weird issue… i guess you will need to raise the issue to alu support (as you probably did already).

    thanks for sharing, let’s see if anyone else can comment on this.


    #69771 Reply

    Dear Pix
    I found that it’s from sector mapping in BTS NEM software. When we don’t choose Brigde function, the 8PSK TRE power will increase to max 42 dBm ( GMSK power now is 44 )
    However, measurement by driving test is not improve much( 2G idle mode)
    So pls give me your advice, does the Brigde affect much to TRE output power ? My teammate said that this brigde is needed for TGT and AGC cabling, and it doesn’t affect to output power

    #69772 Reply

    The tx power is the issue of TGT and AGC.

    Swap the TGT card with the repaired one.

Viewing 6 posts - 1 through 6 (of 6 total)
Reply To: Tx Power decrease in ALU GSM BTS
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