RFL Electronics 9780 - External Power Amp I;O Module

RFL 9780 RFL Electronics Inc.
April 8, 2003 17-91 (973) 334-3100
17.9 EXTERNAL POWER AMP I/O MODULE
Figure 17-43. External Power Amp I/O module, rear panel view
17.9.1 DESCRIPTION
The external power amp I/O provides an interface when an external high power amplifier is used with
the 9780. This module replaces the standard 10W power amplifier for this application. Two panel
mounted BNC connectors provide the TX and RX signal interface for the external amplifier and
receiver connection.
The External Power Amp I/O module (Figure 17-43) is composed of two sections. One section provides
an RX line interface and has provisions for an external power meter, and the other section provides TX
scaling and external power amplifier fail inputs. This I/O module is presently available in the following
version:
Alarm Input Voltage Assembly No.
12V 106675
This module has six sets of jumpers that must be configured before the module is placed in service.
The B board has jumper JP101 which can select three RX terminations (50Ω, 75Ω, or high impedance).
The A board has five sets of jumpers: JP1, JP2, JP3, JP4 and JP5. Jumpers JP3 and JP4 must be set to
position C to select 12V alarm inputs. Setting jumpers JP1, JP2 and JP5 are described in Tables 17-20
and 17-21.
The Input/Alarm I/O module is primarily used for TX/TX, TX/RX or TX only applications, which use
an external 50W or 100W power amplifier. It can also be used for customer specific applications and
can be mounted in a spare I/O slot or in an expansion chassis.
EXT POWER AMP
+
-
EXT MTR
A
MP FAIL
+
-
+
-
EXTERNAL POWER AMP
FAIL INPUT #1
EXTERNAL POWER
AMP
FAIL INPUT #2
TO EXTERNAL
RECEIVE LEVEL
METER
TX RX
#1
#2