User's Manual

Test Set Calibration – continued
FEB 2005 1X SC 4812T Lite BTS Optimization/ATP 3-107
PRELIMINARY
Calibrate Test Cabling using a
Signal Generator and Spectrum
Analyzer
Refer to Figure 3-42 and perform the procedure in Table 3-33 to calibrate
the TX Test Cable Configuration for all BTSs or the RX ATP Test Cable
Configuration for BTSs with Duplexed TX/RX using the Signal
Generator and Spectrum Analyzer.
Refer to Figure 3-43 and perform the procedure in Table 3-34 to calibrate
the Test Cable Configuration for non–Duplexed RX using the Signal
Generator and Spectrum Analyzer.
TX and Duplexed RX Cable Calibration
Table 3-33: TX/Duplexed RX Test Cabling using Signal Generator and Spectrum Analyzer
Calibration Procedure
n Step Action
1 Connect a Short Test Cable between the Spectrum Analyzer and the Signal Generator as shown in
Figure 3-42, Detail “A” (top portion of figure).
2 Set the Signal Generator to 0 dBm at the Customer Frequency.
– 869.7–893.31 MHz for North American Cellular
or
– 1930–1990 MHz for North American PCS
3 Use Spectrum Analyzer to measure the Signal Generator Output.
4 Record the value for the Detail “A” Set–up.
5 Change the Test Set–up to the one shown in Detail “B” (lower portion of Figure 3-42), to measure
Cable Output at the Customer Frequency.
– 869.7–893.31 MHz for North American Cellular
or
– 1930–1990 MHz for North American PCS
6 Record the value measured using the Detail “B” Test Set–up.
7 Calibration Factor = (Value measured with Detail “A” Set–up) – (Value measured with Detail “B”
Set–up)
Example: Calibration Factor = –1 dBm – (–53.5 dBm) = 52.5 dBm
* IMPORTANT
The Short Test Cable is used for Calibration Only.
– It is not part of the Final Test Set–up.
After Calibration is completed, do not re-arrange any cables.
– Use the Test Cable Configuration as–is to ensure that the Test Procedures use the correct
Calibration Factor.
3