User Manual

6 Troubleshooting
66
; Note: The following tests should be performed by a trained technician only. These
tests require external equipment such as a calibrated Spectrum Analyzer.
Expected Level
Test point # Sector Function
Nominal Value FAT Value
1 1
2 2
3 3
Upconverter output
49±3 dBmV
(1)
34±2 dBmV
(2)
par. 5.1.1.3
4 All
Downstream cluster
combined signal
(3)
5±4 dBmV each
channel
(1)
5±3 dBmV each
channel
(1)
par. 5.1.1.3
5 1
6 2
7 3
Upstream Post LNA RF
signal
Level: -54±4 dBm
(1)
SNR: 24±3 dB
(4)
8 1
9 2
10 3
Upstream Post
Downconverter IF signal
(6)
Level: -43±4 dBm
(1)
Noise level -31 ± 3
dBmv
(5)
SNR: 24±3 dB
(4)
Noise level -31 ±
3 dBmv
(5)
par. 5.2.2.3
(1) Measured with Spectrum Analyzer set at: RBW=1 MHz, VBW=1 KHz
(2) Measured with Spectrum Analyzer set at: RBW=10 KHz, VBW=300 Hz
(3) The downstream signal level at this test point is about 84 dB below the Base Station output
power. This test point can serve to connect an external modem to the system for testing
purposes.
(4) Measured with Spectrum Analyzer at: RBW=100 KHz, VBW=3 KHz
(5) Measured with Spectrum Analyzer at: RBW=10 KHz, VBW=100 KHz
(6) Inserting the Sharp IF Filter and the attenuator before the V3100 (for gain compensation) does not
change the Test Points levels (up to ± 1 dB).
; 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.
Cabling Information
If a cable disconnects, use the following diagram to learn how to re-connect it.