What is satellite?
Satellite is an object which has been placed into orbit by human endeavor. Such objects are sometimes called artificial satellites to distinguish them from natural satellites such as Moon.
Purpose of satellite communication
- To provide signal for distribution over AIR, Doordarshan Networks & cable.
- To have interlink between different AIR&TV centers for contributions of programmes like News & Current Affairs.
BASIS OF A SATELLITE COMMUNICATION
➢ Essentially Microwave Link Repeaters
➢ Frequencies capable of passing through Ionosphere use.
➢ Microwave frequencies permit transmission of data at high rate.
Reasons of satellite revolution
➢ It is often the only solution for developing areas.
➢ It is ideal for broadcast applications
➢ It can be rapidly deployed
➢ It is scalable.
RECEIVING AND TRANSMITTING DEVICE
- Low Noise Amplifier(LNA) or Low Noise Block(LNB)
- LNA amplifies RF signal from the antenna and feeds it into frequency converter (typically IF of 70/140 MHz)