Furuno FELCOM 70 Operator's Manual page 206

9. SYSTEM DESCRIPTION
System satellites
The satellites are positioned in a geostationary orbit above the equator at
approximately 35700 km altitude. See figure below.
In geostationary orbit, each satellite moves at the same rate as the earth, and so
remains in the same relative position to the earth.
The satellites provide 99% landmass coverage.
FELCOM 70 can communicate via the four satellite Ocean Regions:
AOR-W
AOR-E
IOR
POR
The coverage area of the satellites for FELCOM 70 (GAN) is shown on page
3-4. Communication is possible in areas marked with ellipse.
Transmission frequencies
The Inmarsat GAN terminals operate in the following frequency bands:
• MES transmission frequencies:1626.5 MHz - 1646.5 MHz
• MES receiving frequencies:1530.0 MHz - 1559.0 MHz
A large number of channels are available (20 kHz channel separation), offering
either 4.8 or 64 kbps voice communication, as well as 3.1 kHz audio or 64 kbps
(56 kbps) data communication.
Duplex communication uses two channel frequencies, one in each direction.
The LESs provide interface to the international networks for telephony and data:
PSTN (Public Switched Telephone Networks) and PSDN (Packet Switched Data
Networks).
9-2
Atlantic Ocean West Region
Atlantic Ocean East Region
Indian Ocean Region
Pacific Ocean Region
178˚E
Pacific Ocean Region
Atlantic Ocean Region (West)
Atlantic Ocean Region (East)
Satellite positions.
Indian Ocean Region