User's Manual

Troubleshooting: Calibration
PRELIMINARY
1X SCt4812ET Lite BTS Optimization/ATP
08/01/2001
6-10
Bay Level Offset Calibration
Failure
Table 6-10: Troubleshooting BLO Calibration Failure
n 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; Freq_Band=16
For 800 MHz:
Bandclass=0; Freq_Band=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 the power sensor.
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 the power sensor 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 working, the Meter
display will show “RES :’’
8 Verify the combiner frequency is the same as the test freq/chan.
6