User's Manual Part 2

Bay Level Offset Calibration – continued

Apr 2001

3-63

SC4812ET BTS Optimization/ATP — CDMA LMF

DRAFT

 The 20 calibration entries for each slot/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 BBX2 is loaded with BLO data, the cal file data for the

BBX2 is downloaded to the device in the order it is stored in the CAL

file. TxCal data is sent first, C[1] – C[60]. BBX2 slot 1’s 10

calibration points are sent (C[1] – C[20]), followed by BBX2 slot 2’s

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

followed by the RxDCal data.

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

slot.

Test Equipment Setup:

RF Path Calibration

Follow the steps outlined in Table 3-32 to set up test equipment.

Table 3-32: Test Equipment Setup (RF Path Calibration)

Step Action

NOTE

Verify the GPIB 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 or via a 30 dB coupler with a 20 dB in–line attenuator for 1900 MHz.

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 3-6.

 If required, calibrate the test equipment per the procedure in Table 3-24.

 Connect the test equipment as shown in Figure 3-9 and Figure 3-10.