Comtech EF Data CRS-280, Installation And Operation Manual, Page: 22 / 70

CRS-280/280L IF Switch for 1:N Redundancy
Revision -
Introduction 1–8 MN-CRS-280/280L
1.3 Summary of Specifications
Equipment Type
CRS-280
(70/140 MHz)
CRS-280L
(L-Band)
Comtech EF Data Modems Supported
•
SDM-2020D (L-Band) (when used
with CRS-400) (legacy products)
• SDM-300L3 (when used with SMS-
7000) (legacy products)
•
CDM-570L (when used with CRS-
300 or CRS-500)
• CDM-600L (when used with CRS-
300)
•
CDM-9600L (when used with CRS-
300)
• CDM-625/625A (when used with
CRS-300 or CRS-500)
•
SLM-5650A (when used with CRS-
300 or CRS-500)
•
SDM-2020D (L-Band) (when used
with CRS-400) (legacy products)
• SDM-300L3 (when used with SMS-
7000) (legacy products)
•
CDM-570L (when used with CRS-
300 or CRS-500)
• CDM-600L (when used with CRS-
300)
•
CDM-9600L (when used with CRS-
300)
• CDM-625/625A (when used with
CRS-300 or CRS-500)
•
SLM-5650A (when used with CRS-
300 or CRS-500)
Tx/Rx Operating Frequency 50 to 180 MHz 950 to 2150 MHz
IF Impedance 50
Ω
and 75
Ω
50
Ω
TX Return Loss
18 dB return loss into 75
Ω
(50 Ω optional)
< 12 dB return loss into 50
Ω
TX to TX Channel Isolation
> 50 dB > 70 dB
RX to RX Channel Isolation
> 50 dB > 70 dB
TX to RX Channel Isolation
> 60 dB > 90 dB
Tx IF Loss / Flatness
TX (in) to associated Uplink (out) < 1.5 dB over operating frequency
< 0.8 dB / 0.5 dB over operating
frequency
BU (in) to any Uplink (out) < 1.5 dB over operating frequency
< 2.5 dB / 1.0 dB over operating
frequency
Rx IF Loss / Flatness
DL (in) to associated RX (out) < 5 dB over operating frequency
< 4.0 dB / 0.5 dB over operating
frequency
Any DL (in) to BU RX (out) < 5 dB over operating frequency
< 5.5 dB / 1.0 dB over operating
frequency
Max. # of Downlinks 10 10
Tx/Rx IF Connectors
50/75 Ω BNC female 50 Ω Type ‘N’ female