User Manual

Test Set Calibration – continued

PRELIMINARY 2

July 1999

3-57

SC 4812ET BTS Optimization/ATP – CDMA LMF

Table 3-29: Cable Calibration

 ActionStep

4 Click OK. Follow the direction displayed for each step. A status report window will be displayed

with the results of the cable calibration (refer to Figure 3-15).

Calibrating TX Cables Using a

Signal Generator and

Spectrum Analyzer

Follow the procedure in Table 3-30 to calibrate the TX cables using the

signal generator and spectrum analyzer. Refer to Figure 3-23 for a

diagram of the signal generator and spectrum analyzer.

Table 3-30: 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 1840–1870 MHz band for Korea PCS and

1930–1990 MHz band for North American PCS.

3 Use spectrum analyzer to measure signal generator output (see Figure 3-23, “A”) and record the value.

4 Connect the spectrum analyzer’s short cable to point “B”, as shown in the lower portion of the

diagram, to measure cable output at customer frequency (1840–1870 MHz for Korea PCS and

1930–1990 MHz for North American PCS) and 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.