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CRS-180 70/140 MHz IF 1:1 Redundancy Switch
Introduction
1.3
Summary of Specifications
Equipment Type
Manufacturer
Comtech EF Data
Modems Supported
Operating Modes
Architecture
Switch Conditions
IF Switching/
Splitting
Tx-Rx Isolation
IF Impedance
IF Connectors
IF Frequency Range
Weight
Dimensions
Power requirements
Approvals
IF 1:1 Redundancy Switch
Comtech EF Data, Tempe, Arizona
• CDM-625 Advanced Satellite Modem (18 kbps – 25 Mbps)
• CDM-750 Advanced High-Speed Trunking Modem
• CDM-570 70/140 MHz Satellite Modem
• CDM-700 70/140 MHz Satellite Modem
• CDM-710 70/140 MHz Broadcast Satellite Modem
• CDM-710G 70/140 MHz High-Speed Satellite Modem
• Fully Automatic under control of supporting 1:1 switch.
• Manual under control of supporting 1:1 switch.
• Full bridging architecture with configuration synchronization.
• Tx switching guarantees the Offline modem is muted at least 60 dB down.
• Rx IF signal fed to both Online and Standby units.
Tx/Rx switching follows state of supporting data switching via control input from data
switch.
• Tx IF: Switched by RF relay (1.5 dB max loss, 40 dB min ON/OFF isolation)
• Rx IF: Passive power splitting (4dB max loss)
40 dB min, 50 - 190 MHz
Optimized for 50Ω (> 10 dB return loss on external IF ports), 75Ω supported with the
use of external RF transformers (included).
50Ω BNC Female
50 to 190 MHz
1.1lbs (0.5kg)
1.7 H x 5.7 W x 4.1 D inches
(43 H x 143 W x 104 D mm [excluding connectors])
19-inch rack mounting kit available.
1 Watt maximum
+12 volts DC @ 80 mA (max)
(Power supplied by modems)
'CE' as follows:
•
EMC
•
Safety
1–13
Revision 8
MN/CRS180.IOM
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