User's Manual

Test Set Calibration68P09255A61-4
Aug 2002
1X SC 4812T BTS Optimization/ATP Software Release 2.16.1.x
FIELD TRIAL
3-63
Table 3-28: Cable Calibration
 Step Action
1 From the Util menu, select Cable Calibration.
A Cable Calibration window is displayed.
2 Enter a channel number(s) in the Channels box.
NOTE
Multiple channels numbers must be separated with a comma, no space (i.e., 200,800). When two
or more channels numbers are entered, the cables are calibrated for each channel. Interpolation is
accomplished for other channels as required for TX calibration.
3 Select TX and RX Cable Cal, TX Cable Cal, or RX Cable Cal in the Cable Calibration pick
list.
4 Click OK. Follow the direction displayed for each step.
A status report window displays the results of the cable calibration.
Calibrating TX Cables Using a Signal Generator and Spectrum Analyzer
Follow the procedure in Table 3-29 to calibrate the TX cables using a
signal generator and spectrum analyzer. Refer to Figure 3-20 for a
diagram of the signal generator and spectrum analyzer.
Table 3-29: Calibrating TX Cables Using Signal Generator and Spectrum Analyzer
 Step Action
1 Connect a short test cable between the spectrum analyzer and the signal generator.
2 Set signal generator to 0 dBm at the customer frequency of:
- 869-894 MHz for 800 MHz CDMA
- 1930-1990 MHz for North American PCS.
- 1840-1870 MHz for Korean PCS
3 Use a spectrum analyzer to measure signal generator output (see Figure 3-20, A) and record the
value.
4 Connect the spectrum analyzer’s short cable to point B, (as shown in the lower right portion of the
diagram) to measure cable output at customer frequency of:
- 869-894 MHz for 800 MHz CDMA
- 1930-1990 MHz for North American PCS.
- 1840-1870 MHz for Korean PCS
Record the value at point B.
5 Calibration factor = A - B
Example: Cal = -1 dBm - (-53.5 dBm) = 52.5 dB
NOTE
The short cable is used for calibration only. It is not part of the final test setup. After calibration is
completed, do not re-arrange any cables. Use the equipment setup, as is, to ensure test procedures
use the correct calibration factor.
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