Motorola SG 2000 用户手册
O v e r v i e w
2 - 9
SG 20 00 Ins tal la tion and O pera tion M anua l
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.
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 r e c e i v e r f u n c t i o n a l d i a g r a m
SG 2 - L R r e c e i v e r f u n c t i o n a l d i a g r a m
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