RFL 9780 RFL Electronics Inc.
April 8, 2003 17-65 (973) 334-3100
17.8 LINE I/O MODULES
Figure 17-27. Typical Line I/O module (106585-1), rear panel view
17.8.1 DESCRIPTION
There are eleven types of Line I/O modules that can be used in the RFL 9780. The rear panel of the
106585-1 is shown in Figure 17-27. The rear panel views of all eleven types of Line I/O modules can
be seen in Figure 17-2. The paragraphs that follow, describe each of these Line I/O modules.
17.8.1.1 TX/RX RF LINE I/O MODULES (106585-1, 106585-2)
The 106585-1 and 106585-2 Line I/O modules provide a single UHF connector for connection to the external
line coupling equipment. The signal path is protected with a spark-gap protection device. The 106585-1 is
typically used in a TX/RX chassis where a hybrid is used to combine signals to provide a single port for
connection to the line coupling equipment.
The 106585-2 is identical to the 106585-1 but adds a two position terminal block for connecting an
external receive level meter.
17.8.1.2 TX/RX RF LINE I/O MODULES (106585-3, 106585-4, 106585-5)
The 106585-3 Line I/O module provides three UHF connectors for field connections. All three ports
have a spark-gap protection device. The top port is for TX signals, the bottom port is for RX signals,
and the middle port is for combined signals. This I/O is normally used in a TX/RX chassis.
In a TX/RX chassis with no internal hybrid, the TX and RX ports are independent, and the middle port
is not used. The RX port contains additional input protection circuitry and has a selectable line
termination impedance.
106585-1
TX/RX RF LINE I/O
J6
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