Comtech EF Data CRS-311 - Manual (Page 42)

CRS-311 1:1 Redundancy Switch Revision 7
Introduction MN/CRS311.IOM
1–18
1.4.2 CRS-281x IF Switch Module Specifications
Feature
Specification
CRS-281 (70/140MHz)
Specification
CRS-281A/CRS-281L (L-Band)
Tx/Rx Operating Freq 50 to 180 MHz 950-2000 MHz
Tx/Rx Connectors
• TNC (female) with 50Ω path
• BNC (female) with 50Ω or 75Ω path
N-Type (female) with 50 Ω path
Return Loss 18 dB > 10 dB on external IF ports
Transmit IF Loss/Flatness:
Tx In to Tx Uplink Out
BU In to Any Uplink Out
< 1.5 dB over operating frequency
< 1.5 dB over operating frequency
Tx IF note: Switched by RF relay (1.5 dB
max loss, 40 dB min ON/OFF isolation)
Receive IF Loss/Flatness:
Rx Downlink In to Rx Out
Any Downlink In to BU Out
< 5 dB over operating frequency
< 5 dB over operating frequency
Rx IF note: Passive power splitting
(7 dB max loss)
Tx to Tx Channel Isolation > 50 dB > 50 dB
Tx to Rx Channel Isolation > 60 dB 90dB min
IF Switch Power From CRS-311 chassis From CRS-311 chassis
IF, BUC/LNB DC, 10 MHz and
BUC FSK Switching
N/A CRS-281A (CDM-QxL only)