User's Manual

Bay Level Offset Calibration – continued

FEB 2005 1X SC 4812T Lite BTS Optimization/ATP 3-117

PRELIMINARY

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 SCCP BBX–1 Slot Transmit (Table 3-38).

The BLO Data for the highest frequency measured (Channel 777) will

be written to the remaining eight Transmit Calibration Points (defined

by Entry C[5] through Entry 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..

CAL File and BLO Data Download

When BLO Data is downloaded to the BBX Cards after Calibration, the

data is downloaded to the devices in the order it is stored in the CAL

File. TX Calibration Data (Entries C[1] through C[60]) are sent first.

Data for the ten BBX Slot 1 Calibration Points (Entries C[1] through

C[20]) are sent initially, followed by data for the ten BBX Slot 2

Calibration Points (Entries C[21] through C[40]), and so on. The RX

Calibration Data is sent next in BBX Slot Sequence, followed by the RX

Diversity Calibration Data.

Test Equipment Set–up for

RF Path Calibration

Perform the procedure in Table 3-39 and refer as needed to Figure 3-16

or Figure 3-17 to Set–up Test Equipment.

Table 3-39: Set–up Test Equipment for RF Path Calibration Procedure

n Step Action

1 If it has not already been done, refer to the procedure in Table 3-6 (on Page 3-18) to interface the

LMF Computer Terminal to the BTS Frame LAN A Connector.

2 If it has not already been done, refer to Table 3-10 (on Page 3-29) to start a GUI LMF Session.

3 If required, calibrate the Test Equipment per the procedure in Table 1-4.

table continued on next page