User's Manual Part 2

Test Set Calibration – continued

MAY 2004 1X SC480 BTS Hardware Installation, Optimization/ATP, and FRU 6-71

PRELIMINARY

Table 6-26: Procedure to Test Cabling Calibration using Communication System Analyzer

n ActionStep

Enter one or more channel numbers in the Channels box.

NOTE

Multiple channel numbers must be separated by a comma with no spaces (for example: 200,800).

When two or more channel numbers are entered, the cables will be calibrated for each channel.

Interpolation will be 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 picklist.

4 Click OK, and follow the directions displayed for each step. A status report window will be

displayed with the results of the cable calibration.

Calibrate Test Cabling Using

Signal Generator & Spectrum

Analyzer

Refer to Figure 6-21 and follow the procedure in Table 6-27 to calibrate

the TX test cable configuration for all BTSs or the RX ATP test cable

configuration for BTSs with duplexed TX/RX using the signal generator

and spectrum analyzer. Refer to Figure 6-22 and follow the procedure in

Table 6-28 to calibrate the test cable configuration for non–duplexed RX

using the signal generator and spectrum analyzer.

Table 6-27: Procedure to Calibrate TX/Duplexed RX Test Cabling Using

Signal Generator & Spectrum Analyzer

Step Action

1 Connect a short test cable between the spectrum analyzer and the signal generator as shown in

Figure 6-21, detail “A” (top portion of figure).

2 Set signal generator to 0 dBm at the customer frequency of:

869–894 MHz or 1930–1990 MHz

3 Use spectrum analyzer to measure signal generator output (see Figure 6-21, 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 or 1930–1990 MHz

Record the value at point B.

Calibration factor = (value measured with detail “A” setup) – (value measured with detail “B” setup)

Example: Cal factor = –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 test cable configuration as is to ensure test

procedures use the correct calibration factor.