RFL Electronics 9780 - Figure 2-5. Block Diagram of Typical RFL 9780 Rx;Rx Terminal

RFL 9780 RFL Electronics Inc.
April 8, 2003 2-13 (973) 334-3100
Figure 2-5. Block diagram of typical RFL 9780 Rx/Rx terminal
2.8.1 LOGIC MODULE
The RFL 9780 Logic Module interfaces with most of the receiver and transmitter modules within the
system. The Logic module uses guard, trip, and noise input information that it receives from various
parts of the system to build security and dependability into the receiver. In addition, it monitors trip
input signals and generates signals for the Transmitter Module to control frequency shift and power
level. The Logic Module also provides status information for the Sequence of Events Module.
Additional information on the RFL 9780 Logic Module can be found in Section 6 of this manual.
2.8.2 TX LOGIC MODULE
The RFL 9780 Tx Logic Module interfaces with most of the transmitter modules within the system. It
monitors trip input signals and generates signals for the Transmitter Module to control frequency shift
and power level. The Tx Logic Module also provides status information for the Sequence of Events
Module. The Tx Logic Module is used in place of the Logic Module in systems that do not have any
receive functions. Additional information on the RFL 9780 Tx Logic Module can be found in Section 7
of this manual.
2.8.3 TRANSMITTER MODULE
The 9780 Transmitter Module utilizes Direct Digital Synthesis (DDS) to generate precise carrier
signals. The desired frequency is selected by a bank of direct reading switches. The user selects the
desired center frequency and shift-up and shift-down. The standard transmitter module can be used in a
two or three frequency system.
The output section of the module adjusts the amplitude to provide the desired output power. Additional
information on the RFL 9780 Transmitter Module can be found in Section 8 of this manual.
Logic
Module
Trip,
Guard,
And
Alarm
Outputs
Trip,
Guard,
And
Alarm
Outputs
RS-232
Limiter/
Slicer
CLI with
Narrow Band
Filter
IF/BF
RF Interface
Filter
Limiter/
Slicer
CLI with
Narrow Band
Filter
IF/BF
RF Interface
Filter
SOE/IRIG-B
Logic
Module