User's Manual
Test Set Calibration
68P09255A69-3
Aug 2002
1X SC4812ET Lite BTS Optimization/ATP Software Release 2.16.1.x
PRELIMINARY
3-72
Figure 3-22: Calibration Setup for TX Test Cable Configuration and Duplexed RX Test Cable Configuration
Using Signal Generator and Spectrum Analyzer
50 OHM
TERMINATION
30 DB
DIRECTIONAL
COUPLER
Spectrum
Analyzer
Signal
Generator
A
Spectrum
Analyzer
40W NON-RADIATING
RF LOAD
B
SHORT TEST CABLE
Signal
Generator
THIS WILL CONNECT TO THE POWER METER OR
COMMUNICATIONS SYSTEM ANALYZER DURING TX
CALIBRATION AND TO THE COMMUNICATIONS
SYSTEM ANALYZER DURING TX AND RX ATP TESTS.
SHORT
TEST
CABLE
SECOND TX TEST CABLE
FOR TX CAL AND ATP
20DB 20 W IN-LINE
ATTENUATOR FOR
1.9 GHZ
THIS WILL CONNECT TO THE BTS TX
ANTENNA CONNECTOR DURING TX
CALIBRATION AND TO THE TX/RX ANTENNA
CONNECTORS DURING ATP TESTS.
TX TEST
CABLE
RX TEST CABLE
FOR RX ATP TEST
OR
Calibrating Non-Duplexed RX Test Cable Configuration Using a Signal
Generator and Spectrum Analyzer
Refer to Figure 3-23 and follow the procedure in Table 3-33 to calibrate
the test cable configuration for non-duplexed RX using the signal
generator and spectrum analyzer.
Table 3-33: Calibrating Non-Duplexed RX Test Cable Configuration Using a Signal Generator and Spectrum
Analyzer
Step Action
1
NOTE
When preparing to calibrate a BTS with duplexed TX and RX the RX cable calibration must be done
using calibration setup in Figure 3-22 and the procedure in Table 3-32.
Connect a short test cable between the spectrum analyzer and the signal generator as shown in
Figure 3-23, detail “A” (top portion of figure).
2 Set signal generator to -10 dBm at the customer’s RX frequency of 824.7-848.31 MHz for North
American cellular or 1850-1910 MHz band for North American PCS.
3 Use the spectrum analyzer to measure signal generator output and record the value for the detail “A”
setup.
4 Change the test setup to the one shown in detail “B” (lower portion of Figure 3-23) to measure the
output at the customer’s RX frequency (824.7-848.31 MHz for North American cellular or 1850-1910
MHz band for North American PCS). Record the value measured with the detail “B” test setup.
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