User's Manual Part 2

Bay Level Offset Calibration – continued

DRAFT

SCt4812T CDMA BTS Optimization/ATP

Mar 2001

3-68

 The 20 calibration entries for each sector/branch combination must be

stored in order of increasing frequency. If less than 10 points

(frequencies) are calibrated, the largest frequency that is calibrated is

repeated to fill out the 10 points.

Example:

C[1]=384, odd cal entry

= 1 ‘‘calibration point”

C[2]=19102, even cal entry

C[3]=777,

C[4]=19086,

C[19]=777,

C[20]=19086, (since only two cal points were calibrated this

would be repeated for the next 8 points)

 When the BBX is loaded with image = data, the cal file data for the

BBX is downloaded to the device in the order it is stored in the cal

file. TxCal data is sent first, C[1] – C[240]. Sector 1’s ten calibration

points are sent (C[1] – C[20]) followed by sector 2’s ten calibration

points (C[21] – C[40]), etc. The RxCal data is sent next (C[241] –

C[480]), followed by the RxDCal data (C[481] – C[720]).

 Temperature compensation data is also stored in the cal file for each

set.

Test Equipment Setup:

RF Path Calibration

Follow the procedure in Table 3-33 to set up test equipment.

Table 3-33: Test Equipment Setup (RF Path Calibration)

Step Action

NOTE

Verify the GPIB controller is properly connected and turned on.

! CAUTION

To prevent damage to the test equipment, all transmit (TX) test connections must be via the 30 dB

directional coupler for 800 MHz with an additional 20 dB in–line attenuator for 1.7/1.9 GHz.

1 Connect the LMF computer terminal to the BTS LAN A connector on the BTS (if you have not

already done so). Refer to the procedure in Table 3–2 on page 3-6.

 If required, calibrate the test equipment per the procedure in Table 3-25 on page 3-57.

 Connect the test equipment as shown in Figure 3-11 and Figure 3-12 starting on page 3-48.