User's Manual

Troubleshooting: Calibration

68P64115A18–1

Mar 2003

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

DRAFT

6-10

Troubleshooting: Calibration

Bay Level Offset Calibration Failure

Table 6-11: Troubleshooting BLO Calibration Failure

n 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.