User's Manual

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In–Service Calibration68P64115A18–1

Mar 2003

1X SC 4812T Lite BTS Optimization/ATP Software Release R2.16.1.x

DRAFT

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

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