Sg2-Lr Receiver; Figure 2-7 Sg2-Lr Receiver Functional Diagram - Motorola Starline 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:
F i g u r e 2- 7
SG 2- L R rec eiv e r fu nc tion al di ag ram
Module
enable
Module
enabled
+24V
Module enable
logic
Optical receiver hybrid
Optical
input
Threshold
comparators
Module
fault
Hybrid current
Hybrid current
sense signal
monitor
Hybrid current
Matching
network
Optical power
Optical power
Optical power
monitor
sense signal
Threshold
comparators
Low
Normal
High
S G 2 0 0 0 I n s t a l l a t i o n a n d O p e r a t i o n M a n u a l
O v e r v i e w
(10V/A)
test point
(1.0 V/A)
RF
output
test point
(1 V/mW)
(1 V/mW)
2 - 9