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Installation
Determining the Test Set to Site Equipment Connections
Chapter 2
35
Installation
Determining the Test Set to Site Equipment
Connections
At this point in the process, you must decide the Test Set port and the Base Station port
to be used in testing. At appropriate points in a test sequence, the Test Software will
display prompts directing you to make connections. For details on the required
connections, see Chapter 3, “Connections,” on page 55.
Which Test Set Port to Use – ANT IN or RF IN/OUT?
CAUTION The Test Set ANT IN port is only used for very low signal levels
≤
60 mW (17.78 dBm).
Therefore, to prevent damage to the Test Set, never connect this port directly to the Base
Station TX Antenna Port. This port is typically connected to the Base Station TX Test
Port.
The Test Set RF IN/OUT port is for signals of
≤
75 watts continuous wave or
≤
15 watts
CDMA. This is the only port on the Test Set that you should connect directly to the Base
Station TX Antenna Port. If power levels from the Base Station exceed the specification
of the port, use an appropriate signal attenuator.
Which Base Station Port to Use – TX Test or TX Antenna?
Testing may be performed while connected to either the Base Station Test Port or the
Base Station Antenna Port. Testing at the Antenna Port involves taking the Base
Station out of service. The choices are described in the following sections.
In-Service Testing Using the Base Station TX Test Port
The Base Station TX Test Port signal is derived from the directional coupler that is
connected between the Linear Amplifier and the Base Station TX Antenna Port (see
Figure 2-8). This allows you to make measurements on an active Base Station without
disconnecting the transmit antenna and interrupting service. You must enter a value for
the coupling factor (loss) through the directional coupler to compensate power
measurements (see “Test Configuration” on page 38). Coupling factors are typically 40 to
70 dB, but might vary, depending on the Base Station design.
Figure 2-8 Transmitter Output Path Simplified Diagram
Antenna
Directional
Coupler
Base Station
Linear
Amplifier
TX Test Port
TX Antenna Port
Coupling Factor is the loss through the
directional coupler to the TX Test port.