alammasud
Newbie level 2
Dear Expert,
two gsm 1800 band signals(2 different operator in IBS site share trial project) with
different power level ( 17 dB and 30 dB) in the same feeder cable. this cable goes
to........> 15 DB coupler then 10 DB coupler. the remaining ports of 2 coupler
were terminated by dummy load. Now the cable goes to the i/p of a line amplifier.
we found the i/p of the line amplifier is 6 dB.(dont know how come as there are 2 different signal with 2 different power level) AND then we found the o/p of the amplifier is 41 dB. the amplifier is running by 220v ac supply.
NOW...after doing set up of the above we went to test the signal level in different floors....around the distributed antenna system.......But we finally got very poor Rx_Level of our signal which was coming from the BTS where o/p power of BTS was 33 dBm.
PLEASE TELL US THE REASON FOR RX_LEVEL DEGRADATION....WE ALSO FOUND THE RX_LEVEL OF OTHER OPERATOR'S SIGNAL WAS ALSO VERY LOW
two gsm 1800 band signals(2 different operator in IBS site share trial project) with
different power level ( 17 dB and 30 dB) in the same feeder cable. this cable goes
to........> 15 DB coupler then 10 DB coupler. the remaining ports of 2 coupler
were terminated by dummy load. Now the cable goes to the i/p of a line amplifier.
we found the i/p of the line amplifier is 6 dB.(dont know how come as there are 2 different signal with 2 different power level) AND then we found the o/p of the amplifier is 41 dB. the amplifier is running by 220v ac supply.
NOW...after doing set up of the above we went to test the signal level in different floors....around the distributed antenna system.......But we finally got very poor Rx_Level of our signal which was coming from the BTS where o/p power of BTS was 33 dBm.
PLEASE TELL US THE REASON FOR RX_LEVEL DEGRADATION....WE ALSO FOUND THE RX_LEVEL OF OTHER OPERATOR'S SIGNAL WAS ALSO VERY LOW