User's Manual

Troubleshooting: Calibration

68P09255A69-3

Aug 2002

1X SC4812ET Lite BTS Optimization/ATP Software Release 2.16.1.x

PRELIMINARY

6-10

Troubleshooting: Calibration

Bay Level Offset Calibration Failure

Table 6-11: Troubleshooting BLO Calibration Failure

 Step Action

1 Verify the power meter or communications system analyzer is configured correctly (see the Test

Equipment Set-up section of Chapter 3), and is connected to the proper BTS TX antenna

connector.

2 If a power meter is being used:

2a - Re-calibrate the Power Meter and verify it is calibrated correctly with cal factors from the

power sensor (refer to Appendix F).

2b - Verify the power sensor is functioning properly by checking it with the 1-mW (0 dBm) Power

Ref signal.

2c - Verify communication between the LMF and Power Meter is working by checking that the

meter display is showing RES :

3 Verify the parameters in the bts-#.cdf file are set correctly for the BTS operating band as

follows:

For 1900 MHz:

Bandclass=1; Freq_Band=16

For 800 MHz:

Bandclass=0; Freq_Band=8

4 Verify that no LPA on the carrier is in alarm state (rapidly flashing red LED).

4a - If any are, reset the LPA(s) by pulling the applicable circuit breaker on the DC PDA, and,

after 5 seconds, pushing back in.

5 Verify GPIB adapter is not locked up. Under normal conditions, only 2 green LEDs must be ‘ON’

(Power and Ready). If any other LED is continuously ‘ON’, power-cycle (turn power off and on)

the GPIB Box and retry.