User Manual

4 Configuring the Base Station
Base Station User Guide 41
Note: The related CPE IF TX Frequency is also set using the Upstream Channel Configuration
Menu in the Arcadian Networks Configuration Tool. Use the CPE values appearing in
; Table 4.
; Note: Make sure to check the Spectral Inversion box on the Arcadian Networks
Configuration Tool Upstream menu, since only one stage of the Downconverter will be
used.
Table 4: Base Station Upstream Frequencies
Upstream
Channel
Actual Upstream
Freq. Before
Conversion (MHz)
Actual IF RX Frequency
(MHz)
Related CPE IF TX
Frequency (MHz)
1
787.170 MHz 44.330 MHz 43.670 MHz
2
787.5 MHz 44.0 MHz 44.0 MHz
3
787.830 MHz 43.670 MHz 44.330 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.
Upstream Received level and SNR Setup
The upstream received level and the related received RF SNR are determined by the
received level at the WMTS Hex card receiver input port, since the RF RX path (LNAs,
Downconverter, etc) has a constant gain. The optimum RF SNR delivers the maximum
SNR for the maximum required coverage. The typical RF SNR is 24 dB (for 325 KHz
16QAM upstream channel and 20 miles coverage).
The WMTS received level is adjusted through the FAT procedure for optimum RF SNR.
Warning: Adjustment of the Upstream Received level and RF SNR should be done
only by a trained technician. Decreasing the RF SNR below a certain threshold may
harmfully reduce the received SNR and even stop upstream connection. Increasing
the RF SNR beyond a certain level may also limit the coverage.
; Note: The RF SNR is the RF Signal to Noise levels Ratio at the antenna (which is the
same as at the WMTS receiver input). The RF SNR may vary from the SNR reported by