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Anritsu S251C Guide de l'utilisateur Page 57

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Two Port Measurements
Introduction
A Tower Mounted Amplifier (TMA) can be used to amplify the received signal. There are
different types of TMA depending on the system requirements. Three commonly used types
are:
q
TMA-D¾A duplex tower mounted amplifier that combines transmit and receive
ports from the radio system and connects to a single antenna. This configuration is
specific to systems that use a single antenna configuration.
q
TMA-S¾A receive-only tower mounted amplifier is installed between the receiving
antenna and the radio to boost weak signals. This configuration is common on sys
-
tems that implement separate antennas for transmitting and receiving.
q
TMA-DD¾A dual-duplex tower mounted amplifier used for radios systems with a
single transmission line connection for transmit and receive. These systems are com
-
monly called transceivers.
During installation of the TMA, the following tests should be conducted:
q
Antenna Subsystem Return Loss Testing to verify antenna performance.
q
TMA performance testing to verify the tower mounted amplifier performance.
q
Insertion Loss Measurement Test to verify the transmission line performance before
TMA installation and connecting the antenna.
When troubleshooting TMA problems, the following test should be conducted:
q
Insertion Loss Measurement Test to verify the transmission line performance after
TMA insertion.
q
DTF-Return Loss with the TMA removed from the configuration.
Chapter 4 Measurements
4-12
ANTTX RX
TMA-D
S251C
RF OUT
S251C
RF IN
(Bias Tee)
TMA-S
ANT RX
TMA-DD
ANT RX/TX
S251C
RF OUT
S251C
RF IN
S251C
RF OUT
S251C
RF IN
(Bias Tee)(Bias Tee)
Figure 4-7. Types of Tower Mounted Amplifiers
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