Motorola Starline SG 2000 - Figure 2-7 SG2-LR Receiver Functional Diagram; SG2-LR Receiver

Overview 2-9
SG 2000 Installation and Operation Manual
SG2-LR Receiver
The receiver module (SG2-LR) is designed specifically for high performance in the SG 2000. The
SG2-LR receiver uses an integrated optical-hybrid photo-detector for improved RF performance over
the entire 40 MHz through 870 MHz passband. It is enabled and disabled in response to a signal
from the status monitor transponder or manual control board (MCB). This provides excellent
isolation, improved reliability, and reduced power consumption when the receiver is used in
redundant applications.
Figure 2-7 illustrates a functional block diagram of the SG2-LR receiver:
Figure 2-7
SG2-LR receiver functional diagram
Module
enable
RF
output
Optical
input
Hybrid current
sense signal
(10V/A)
Hybrid current
test point
(1.0 V/A)
Optical power
sense signal
(1 V/mW)
Optical power
test point
(1 V/mW)
Module
enabled
Module
fault
Threshold
comparators
Optical power
monitor
Threshold
comparators
Optical receiver hybrid
Matching
network
Module enable
logic
Hybrid current
monitor
+24V
Low
Normal
High