User's Manual
In-Service Calibration68P09255A69-3
Aug 2002
1X SC4812ET Lite BTS Optimization/ATP Software Release 2.16.1.x
PRELIMINARY
H-21
Follow the procedure in Table H-6 to perform the In-Service
Calibration.
Table H-6: In-Service Calibration
Step Action
NOTE
Perform this procedure after test equipment has been allowed to warm-up and stabilize for a minimum
of 60 minutes.
1 Set up the LMF for In-Service Calibration:
- Start the LMF by double-clicking the LMF icon on the Windows desktop.
- Click Tools > Options from the menu bar at the LMF application window.
- In the LMF Options window, check only the applicable communications system analyzer check
box on the Test Equipment tab.
- Ensure that the GPIB address is 18.
- Uncheck any other other equipment that is selected.
- Click the Apply button.
- Select the BTS Options tab in the LMF Options window.
- Check the In-Service Calibration check box.
- Click the Apply button.
- Click the Dismiss button to close the LMF Option window.
2 Log into the target BTS:
- Select the target BTS icon.
- Click the Login button at the login screen.
3 Measure the Cable Loss using the Cable Calibration function:
- Click Util > Cable Calibration... in the BTS menu bar at the main window.
- Set the desired channel(s) and select TX and RX CABLE CAL from the Cable Calibration
window drop-down list.
- Click the OK button to perform cable calibration.
- Follow the on-screen instructions to complete the cable loss measurement.
NOTE
- The measured value is input automatically to the cable loss file.
- To view the cable loss file, click Util > Examine > Cable Loss from the BTS menu bar.
4 Add the communications system analyzer power delta to the TX Cable Loss.
- In the BTS menu bar, click Util > Edit > Cable Loss... > TX.
- Add the value computed in Table H-4, Table H-5, or Table H-3 to the TX Cable Loss.
NOTE
Be sure to include the sign of the value. The following examples are included to show the mathematics
and do not represent actual readings:
- Example: 5.65 dBm + 0.55 dBm = 6.20 dBm
- Example: 5.65 dBm + (-0.29 dBm) = 5.36 dBm
- Example: -5.65 dBm + 0.55 dBm = -5.10 dBm
- Example: -5.65 dBm + (-0.29 dBm) = -5.94 dBm
. . . continued on next page
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