User Manual

TX BLO Calibration for MC
5/21/04 1X SC4812T–MC BTS Optimization/ATP 3-87
DRAFT
Overview
LMF software release described on page NO TAG may be used to
calibrate the Multicarrier trunked BTS running Software Release
R2.16.4.1 circuit or packet software. These unique procedures are
necessary due to the fact that the SC4812T–MC requires all equipped
PAs to be enabled during TX testing.
TX BLO is obtained with BBXs-under-test having pilot gain set at 262
LSB, while BBXs-not-under–test are keyed at low transmit power
(recommended pilot gain of 127 LSB and XCVR Power Gain set of –25
dBm).
The following procedure assumes that the SC4812T–MC frame is
equipped with 4 carriers and all modules have appropriate software
downloaded. The tasks required are:
S Set-up for TX Calibration
S TX Calibration
S Download TX BLO Data
S Copy TX BLO data for CBSC/OMCR
Set-up for TX Calibration
Table 3-36: Initial Set-up for Multicarrier TX Calibration
n Step Action
1 On the LMF computer, delete the existing calibration file
(if any) from the BTS folder located at <x>:\<lmf home
directory\cdma\bts–#, where # is the number of the BTS
to be calibrated.
2 Edit the nominal TX BLO
– From the Util menu, select Edit > TX Nominal
Offset.
– Change the value based on the BTS frequency band
and configuration in Table 3-35
3 Download the data, which includes BLO values, to all the
BBXs. From the Device menu, select Download > Data
NOTE
Terminate all sector outputs on the frame, since more than
one sector will be keyed during the calibration procedure.
TX Calibration
Follow the procedures in Table 3-37 to perform TX Calibration. Be sure
to follow the primary If performing TX Calibration option in Step 2a.
3