User Manual

Bay Level Offset Calibration – continued
PRELIMINARY 2
SC 4812ET BTS Optimization/ATP – CDMA LMF
July 1999
3-66
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 BBX2, 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 BBX2 (located
under the
ParentSECTOR field of the ParentCARRIER CDF file
parameter).
The calibration procedure attempts to adjust power to within +
0.5 dB of
the desired power.
Perform the calibration of the transmit paths of all equipped BBX2 slots
per the steps in Table 3-36. TX BLO is approximately 40 dB +
3.0 dB.
TX BLO = Frame Power Output minus BBX2 output level.
TX Calibration Test
The Tests menu item, TX Calibration, performs the TX BLO
Calibration test for a XCVR(s). All measurements are made through the
appropriate TX output connector using the calibrated TX cable setup.
Prerequisites
Before running this test, the following should be done:
 CSM–1,GLI2s, BBX2s have correct code load.
 Primary CSM and MGLI2 are INS.
 All BBX2s are OOS_RAM.
 Test equipment and test cables are calibrated and connected for TX
BLO calibration.
 LMF is logged into the BTS.
Connect the test equipment as shown in Figure 3-16 and Figure 3-17
and follow the procedure in Table 3-36 to perform the TX calibration
test.
Table 3-36: BTS TX Path Calibration
 Step Action
1 Select the BBX2(s) to be calibrated.
From the Tests menu, select TX Calibration
2 Select the appropriate carrier(s) displayed in the Channels/Carrier pick list (use the Shift or Ctrl
keyboard key to select multiple items).
3 Type the appropriate channel number in the Carrier n Channels box.
4 Click on OK.
5 Follow the cable connection directions as they are displayed.
The test results will be displayed in the status report window.
6 Click on OK to close the status report window.
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