2
Installation
IRIDIUM
0514
1
Technical Specifications
Space Segment
Satellites
66 (Plus 6 in-Orbit backup satellites)
Orbital planes
6
Orbit height
780 kilometres
Inclination of the orbital planes
86.4 degrees
Orbital period
100 minutes, 28 seconds
Spot beams
48 per satellite
Radio module
Frequency Range
1616 MHz to 1626.5 MHz (L-Band)
Duplexing Method
TDD (Time Domain Duplex)
Oscillator Stability
± 1.5 ppm
Input/Output Impedance
50
Ω
Multiplexing Method
TDMA/FDMA
Average Power during a transmit slot
(max) 7W
Average Power during a frame
(typical) 0.6W
Receiver Sensitivity at 50 Ohm
(typical) -118.5 dBm
Receiver Spurious Rejection at offsets > 1 MHz
(typical) 60 dB
Voice/Data Rate
2.4 kbit/s QPSK
Antenna
Helical, omni-directional 210°
(3 dB beam width)
Fibreglass radome ø 96 mm
Link Margin
16 dB
Antenna Tracking Capability
Turn
Omni-directional antenna
Roll/pitch
Up to ± 20 from horizontal position
Yaw
Elevation > 8°
Interface
Handset
600
Ω
/ 4 wire RS485
Telephone/PABX
270
Ω
+750
Ω
// 150nF / 2 wire
Data
RS232 with handshake
Position information
NMEA 0183
