User's Manual

In–Service Calibration

68P09258A31–A

Oct 2003

1X SCt 4812T BTS Optimization/ATP

H-16

Follow the procedure in Table H-5 to perform the In–Service

Calibration.

Table H-5: 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 login screen.

– Check the applicable spectrum analyzer check box and the signal generator check box on the Test

Equipment tab.

Ensure that the GPIB address is 18 for the CDMA analyzer and 1 for the signal generator.

– Uncheck any other other equipment that is selected.

– Click the Apply button.

– Select the BTS Options tab in the LMF Option window.

– Check the In–Service Calibration check box.

– Click the Apply button.

– Click the Dismiss button to close the LMF Option window.

2 Login to 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 from the menu bar at the main window.

– Set the desired channel(s) and select TX and RX CABLE CAL at the cable calibration pop up

window.

– 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>TX or RX.

4 Add the spectrum analyzer power delta to the Cable Loss.

– To view the cable loss file, click Util>Examine>Cable Loss>TX or RX.

– Add the value computed in Table H-1, Table H-2, 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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