User's Manual

Test Set Calibration – continued
3-108 1X SC 4812T Lite BTS Optimization/ATP FEB 2005
PRELIMINARY
50 OHM
TERMINATOR
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
Figure 3-42: Calibration Set–up for TX/Duplexed RX Test Cabling
using a Signal Generator and a Spectrum Analyzer
Non-Duplexed RX Cable Calibration
Table 3-34: Non–Duplexed RX Test Cabling Using Signal Generator and Spectrum Analyzer
Calibration Procedure
n Step Action
* IMPORTANT
When preparing to calibrate a BTS with Duplexed TX and RX, the RX Cable Calibration must be
done using the Calibration Set–up in Figure 3-42 and the procedure in Table 3-33.
1 Connect a Short Test Cable between the Spectrum Analyzer and the Signal Generator as shown in
Figure 3-43, Detail “A” (top portion of figure).
2 Set the Signal Generator to –10 dBm at the Customer’s RX Frequency.
– 824.7–848.31 MHz for North American Cellular
or
– 1850–1910 MHz for North American PCS
3 Use the Spectrum Analyzer to measure Signal Generator Output.
– Record the value for the Detail “A” Set–up.
table continued on next page
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