User Manual

Adjusting for loss
68P09255A57-2
Aug 2002
SC4812ET Optimization/ATP Manual Software Release R16.1.x.x
PRELIMINARY
3-78
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 BLO 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[60]. BBX slot 1s 10 calibration
points are sent (C[1] - C[20]), followed by BBX slot 2s 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 in Table 3-40 to set up test equipment.
Table 3-40: 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 3-32.
Connect the test equipment as shown in Figure 3-16, Figure 3-17 and Figure 3-18.
Transmit (TX) Path Calibration
The assigned channel frequency and power level (as measured at the top
of the frame) for transmit calibration is derived from the site CDF file.
For each BBX, the channel frequency is specified in the
ChannelList
CDF file parameter and the power is specified in the SIFPilotPwr
CDF file parameter for the sector associated with the BBX (located
under the
ParentSECTOR field of the ParentCARRIER CDF file
parameter).
The calibration procedure attempts to adjust the power to within +
0.5 dB
of the desired power. The calibration will pass if the error is less than
+
1.5 dB.
The TX Bay Level Offset at sites WITHOUT the directional coupler
option, is approximately 42.0 dB ±3.0 dB.
3