User's Manual

Troubleshooting: Calibration68P09258A31–A

Oct 2003

1X SCt 4812T BTS Optimization/ATP

6-7

Troubleshooting: Calibration

Bay Level Offset Calibration Failure

Perform the procedure in Table 6-8 to troubleshoot a BLO calibration

failure.

Table 6-8: Troubleshooting BLO Calibration Failure

n Step Action

1 Verify the Power Meter is configured correctly (see the test equipment setup section in Chapter 3)

and connection is made to the proper TX port.

2 Verify the parameters in the bts–#.cdf file are set correctly for the following bands:

For 1900 MHz:

Bandclass=1; Freq_Band=16; SSType=16

For 800 MHz:

Bandclass=0; Freq_Band=8; SSType=8

For 1700 MHz:

Bandclass=4; Freq_Band=128; SSType=16

3 Verify that no LPA in the sector is in alarm state (flashing red LED).

Reset the LPA by pulling the circuit breaker and, after 5 seconds, pushing back in.

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

head.

5 Verify the GPIB adapter is not locked up.

Under normal conditions, only two 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.

6 Verify the sensor head is functioning properly by checking it with the 1 mW (0 dBm) Power Ref

signal.

7 If communication between the LMF and Power Meter is operational, the Meter display will show

“RES”.