User Manual

4 Configuring the Base Station
40
Table 2: Base Station Downstream Frequencies
Downstream
Channel
Downstream Center IF
Freq.
Actual Downstream Center
RF Freq. After Conversion
1 44.330 MHz 757.170 MHz
2 44.0 MHz 757.500 MHz
3 43.670 MHz 757.830 MHz
; Note: When a one-sector BTS is built, only channel 1 is used. For two-sectors,
channels 1 and 2 are used. For three-sectors, channels 1, 2, and 3 are used.
The downstream IF frequencies are pre-assigned at the WMTS. You can change these
settings using the Downstream Channel Configuration Menu of the Arcadian Networks
Configuration Tool (refer to the NMS User Guide).
For the narrower (245 KHz) channel bandwidth use the following frequency
configuration:
Table 3a: Base Station 4 channels Downstream Frequencies
Downstream
Channel
Downstream Center IF
Freq.
Actual Downstream Center
RF Freq. After Conversion
1 44.367500 MHz 757.132500 MHz
2 44.122500 MHz 757.377500 MHz
3 43.877500 MHz 757.622500 MHz
4 43.632500 MHz 757.867500 MHz
Upstream Channel Frequency Setup
The received upstream signal from the antenna is delivered to the Downconverter, after
amplification in the LNA module. The Downconverter receives a fixed upstream RF frequency
(787.5 MHz) and converts it to a fixed IF frequency (44.0 MHz). All Downconverters are set to the
same frequency. The actual RF received frequency is converted to IF with spectrum inversion.
Each of the Upstream receivers at the WMTS receives the corresponding actual IF frequency. The
actual IF frequencies are listed in
Table 4.
Each upstream channel is associated with the corresponding downstream channel in
the sector. You can change the WMTS channel associations using the Upstream
Channel Configuration Menu of the Arcadian Networks Configuration Tool (refer to the
NMS User Guide).