User's Manual Part 2

Bay Level Offset Calibration – continued

MAY 2004 1X SC480 BTS Hardware Installation, Optimization/ATP, and FRU 6-77

PRELIMINARY

BLO Calibration Data File

During the calibration process, the LMF creates a calibration (CAL) data

file where BLO values are stored. After calibration has been completed,

these offset values must be downloaded to the BBXs using the LMF

BLO download function. A detailed description of the file organization

and content is provided in the following paragraphs

NOTE

Due to the size of the file, Motorola recommends printing out a

copy of a

bts–#.cal file and referring to it for the following

descriptions.

S When referring to the CAL file print–out it can be seen that there is

one BBX slot with 20 “calibration entries” per BBX (sector) for each

branch. Two calibration entries define a single “calibration point;”

therefore there are ten calibration points in each branch for each BBX.

– The first entry for a calibration point (all odd entries) identifies the

CDMA channel (frequency) where the BLO is measured. The

second calibration entry (all even entries) is the power set level

(PwrLvlAdj) for that frequency. The valid range for PwrLvlAdj is

from 2500 to 27500 (2500 corresponds to –125 dBm and 27500

corresponds to +125 dBm).

– The ten calibration points for each slot–branch combination must be

stored in order of increasing frequency. If less than ten points

(frequencies) are calibrated, the BLO data for the highest frequency

calibrated is written into the remainder of the ten points for that

slot–branch.

Example:

C[1]=384

(odd cal entry)

C[2]=19102 (even cal entry)

C[3]=777 (odd cal entry)

C[4]=19086 (even cal entry)

C[19]=777 (odd cal entry)

C[20]=19086 (even cal entry)

= 1 “calibration point”

In the example above, BLO was measured at only two frequencies

(channels 384 and 777) for CCP2 slot BBX–1 transmit. The BLO data

for the highest frequency measured (channel 777) will be written to

the remaining eight transmit calibration points (defined by entries

C[5] through C[20]) for BBX–1.

Slot Block Temperature Compensation – Each BBX slot Block also

has a temperature compensation data section (TempLevelCal) where

power level compensation factors for temperature variations are stored.