User Manual

Troubleshooting: Calibration

SC4812ET BTS Optimization/ATP — CDMA LMF

Jan 2002

6-6

Bay Level Offset Calibration

Failure

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

failure.

Table 6-8: Troubleshooting BLO Calibration Failure

 Step Action

1 Verify the Power Meter is configured correctly (see the test equipment setup section) 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; FreqBand=16

For 800 MHz:

BandClass=0; FreqBand=8

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 sensor

head.

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.

6 Verify 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 :’’

8 Verify the combiner frequency is the same as the test freq/chan.