Iridium provides global mobile telecommunications services using a constellation of 66 low earth orbit satellites in a 86.4° inclined orbit. Although 77 satellites were originally envisioned for the system and spawned the name based on the 77th element in the periodic table, the system has been scaled back. Motorola's Satellite Communications Group designed and manufactured the Iridium satellites with Lockheed Martin providing the LM-700A spacecraft buses.
Low Earth OrbitThe Tempo 1 and 2 satellites can transmit more than 200 channels of high-fidelity broadcast programming to cable companies and home dishes. Tempo has twice the power and capacity of comparable satellites. It features 32 high-powered Ku-band transponders at 115 Watts, switchable to 16 transpondersders at 220 Watts. Total on-board transmitter power totals 3500 Watts.
Geostationary Orbit