External Power Amplifiers R&S XU 4200
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3.13 External Power Amplifiers
External Power Amplifier\External Power Amplifier "Radio".doc
3.13.1 External Power Amplifier R&S VU220L
This chapter
This chapter provides information on how to operate the radio together with
the R&S VU220L VHF external power amplifier.
3.13.1.1 Introduction/Overview
Introduction
The radio supports the use of an external power amplifier.
The R&S VU220L VHF external power amplifier is set to a fixed gain of
10 dB. This means that with input power of 10 W signals will be transmitted
at output power of 100 W.
The amplifier is operated (switched on/off) via the PTT signal which controls
the TX/RX relay of the amplifier. In standby operation the signal from the
antenna is passed through the amplifier to the amplifier's RF input. Thus,
the signal from the antenna is available at the receiver. When the PTT is
active, the signal from the transmitter is passed through the TX/RX relay of
the amplifier to the amplifier's RF input. The amplified signal is passed to
the antenna.
In case of any error an alarm signal is generated by the amplifier at the Test
pin (X200.4). The alarm signal can be connected to the radio's USER_IN
input, X7.15. The CBIT event 0342 "User Contact Warning" can be
configured to indicate the alarm.
3.13.1.2 Cabling
Instructions
1. Connect the USER_OUT output (X7.14) of the radio to the *PTT input
(X200.3) of the amplifier and connect the ground contacts of the two
units (X7.3, X7.4, X7.9 and X200.1, 15) with one another.
2. Connect the Common Antenna output (X3) of the radio to the RF IN
input (X5) of the amplifier.
3. If necessary, connect the Test control signal (X200.4) of the amplifier to
the USER_IN input (X7.15) of the radio.
4. Connect the RF OUT output of the amplifier to the antenna.
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