Science and Technology study material for APPSC Exams

What are the components of Communication Satellites ? Add a note on the uses of communication satellites.

Communication Satellites  are geostationary satellites orbiting the earth at 36ooo km above the equator. They provide four basic services -  Telecommunication, TV broadcasting, Radio broadcasting and Weather forecasting. They provide value added services like Data relay, Early warning system, Search and rescue.

COMPONENTS OF A COMMUNICATION SATELLITE ARE:

1. C-band transponder:

• It is used for transmitting telecommunication signaks and for transferring large data at high speed.


• Each transponder can handle 12,000  tele-communication channels simultaneously.

 2. Upper extended C-band Transponder:

• It has a wider beam coverage than a normal C-band transponder.

3. Lower extended C-band Transponder:

• It has a narrow beam coverage than a normal C-band transponder.

4. S-band Transponder:

• It is used in TV and Radio broadcasting.

5. Ku band Transponder:

• It has double the capacity of C-band and also higher frequency than  C-band.


• It caters exclusively to business networking and for internet service providers and satellite news gathering.


• It is also used for DTH services.

6. Mobile Satellite Service Transponder (MSS):

• It is a combination of C-band and S-band facilities.


• It provides communication facilities for sea-borne vessels, aircraft and moving vehicles with the earth stations situated on land.

 7. Very High Resolution Radiometer (VHRR):

• It is used for weather forecasting.

• It provides data once in 3 hours and has a resolution of 2 km.

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