Lecture 3, Earth Segment

Presentation / Lecture 3, Earth Segment

Date Submitted: 06 June 2001

Written by RPC Telecommunications. Website: http://www.rpctelecom.com

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This is the third in the series of general satcom tutorial lectures submitted by RPC Telecommunications.

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 Printable Version
-Section 1
Types and components of an Earth Station
-Section 2
General Construction
-Section 3
Antenna Theory
-Section 4
Radiation Patterns
-Section 5
-Section 6
-Section 7
Low-noise Amplifiers
-Section 8
Power Amplifiers
-Section 9

Earth Station Types

-International Gateway Earth Station
(8 - 32m Antenna)
e.g. BT's Goonhilly and Madley, UK

-National Trunk System Earth Stations
(8 - 32m Antenna)
e.g. Rio, operating to Brazilsat

-TV Distribution Earth Stations
(5 - 18m Antenna)
e.g. IDB Teleport, Newark, USA

-Small-dish Business System Stations
(2.5 - 5.5m Antenna)

-Very Small Aperture Terminals (VSAT)
(5.5 - 15m Hubs)
(1.2 - 3.5m VSATs)

-Television Receive Only Terminals (TVRO)
(0.45 - 3m Antenna)
Earth Station Components
An Earth terminal will always include an antenna.

Terminals may also include:
  • Low-noise amplifiers (LNAs) or low-noise down-converters
  • High-power amplifiers (HPAs)
  • Signal processing equipment (e.g. down-converters, up-converters, IF amplifiers, modems and codecs)
  • Transmission and signalling equipment at the interface between the terminal and the terrestrial network
  • Supervisory and control equipment
  • Enclosures to protect the equipment from the environment

Note, not everything is present in every terminal. For example, HPAs are not required for receive-only terminals.

Next: Section 2 - General Construction


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