Appendix B: Repeater's Interference To Bts - Comba Telecom RF-9122 Equipment Manual

EQUIPMENT MANUAL FOR RF-9122 GSM900-GSM1800 FSR

7.2 APPENDIX B: REPEATER'S INTERFERENCE TO BTS

The interference to BTS from master-unit must be minimized for the required coverage; uplink noise
output of the master-unit will give rise to the noise level at the BTS port.
The noise gain induced by the equipment at the BTS port has the following relationship:
Where:
Whilst keeping the parameters constant, such as
BTS coverage will reduce to give and the repeater extended coverage.
It is essential that in addition to ensure coverage is achieved, the uplink gain G
to minimize the impact on BTS.
RF-9122T18 QE
ENU Status : 1-0-0
G
– uplink gain of the repeater (dB)
rep
L
– distance loss from DT port of the repeater to BTS port
d
F
– uplink noise figure of the repeater
rep
F
– uplink noise figure of BTS
BTS
Copyright - refer to title page
G
increases, the interference to BTS increases,
rep
should be adjusted
rep
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