Chapter 1. Introduction; Overview - Comtech EF Data CRS-170A Installation And Operation Manual

1.1

Overview

The CRS-170A L-Band 1:1 Redundancy Switch module, shown in Figure 1-1, is an L-Band Tx-Rx IF
signal switch designed for use with L-Band satellite modems in a 1:1 configuration.
The Tx (transmit) side switches four modem output signals that are multiplexed onto the transmit
coaxial cable:
950-2250 MHz L-band transmit RF;
•
10 MHz BUC frequency reference;
•
600 KHz BUC FSK control and status communication;
•
BUC DC power supply.
•
The Rx (receive) side of the switch uses both power dividers and relays to provide the redundant
modem interface for three signals multiplexed onto the LNB coaxial cable:
950-2250 MHz L-band receive RF from LNB;
•
10 MHz frequency reference to LNB;
•

Chapter 1. INTRODUCTION

Figure 1-1. CRS-170A L-Band 1:1 Redundancy Switch
1–1