Motorola SG 2000 operation manual SG2-LR Receiver, SG2-LR receiver functional diagram

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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 enabled

Threshold

comparators

Module

+24V

fault

Hybrid current

Module

Module enable

Hybrid current

sense signal

enable

logic

monitor

(10V/A)

Hybrid current

Optical receiver hybrid

test point

(1.0 V/A)

Optical

RF

Matching

input

network

output

Optical power

test point

(1 V/mW)

Optical power

Optical power

monitor

sense signal

(1 V/mW)

Threshold comparators

Low

Normal

High

SG 2000 Installation and O peration Manual