User's Manual

Test Set Calibration68P09255A69-3
Aug 2002
1X SC4812ET Lite BTS Optimization/ATP Software Release 2.16.1.x
PRELIMINARY
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Table 3-31: Test Cable Configuration Calibration with a Communications System Analyzer
Step Action
2
Enter one or more channel numbers in the Channels box.
NOTE
Multiple channel numbers must be separated by a comma with no spaces (for example, 200,800).
When two or more channel numbers are entered, the cables will be calibrated for each channel.
Interpolation will be accomplished for other channels, as required, for TX calibration.
3 Select TX and RX CABLE CAL, TX CABLE CAL or RX CABLE CAL in the Cable Calibration
picklist.
4 Click OK, and follow the directions displayed for each step.
- A status report window will be displayed with the results of the cable calibration.
Calibrating TX and Duplexed RX ATP Test Cable Configurations Using a
Signal Generator and Spectrum Analyzer
Refer to Figure 3-22 and follow the procedure in Table 3-32 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.
Table 3-32: Calibrating the TX Test Cable Configuration or the Duplexed RX Test Cable Configuration
Using Signal Generator and Spectrum Analyzer
Step Action
1 Connect a short test cable between the spectrum analyzer and the signal generator as shown in
Figure 3-22, detail “A” (top portion of figure).
2 Set signal generator to 0 dBm at the customer frequency of the 869.7-893.31 MHz band for North
American cellular and 1930-1990 MHz band for North American PCS.
3 Use spectrum analyzer to measure signal generator output and record the value for the detail “A”
setup.
4 Change the test setup to the one shown in detail “B” (lower portion of Figure 3-22), to measure cable
output at customer frequency (869.7-893.31 MHz band for North American cellular and 1930-1990
MHz for North American PCS) and record the value measured using the detail “B” test setup.
5
Calibration factor = (value measured with detail “A” setup) - (value measured with detail “B” setup)
Example: Cal factor = -1 dBm - (-53.5 dBm) = 52.5 dB
NOTE
The short cable is used for calibration only. It is not part of the final test setup. After calibration is
completed, do not re-arrange any cables. Use the test cable configuration as-is to ensure test
procedures use the correct calibration factor.
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