SOLAR SYSTEM

Detailed explanation-1: -The satellites used for broadcasting television are usually in a geostationary orbit 37, 000 km (23, 000 mi) above the earth’s equator. The advantage of this orbit is that the satellite’s orbital period equals the rotation rate of the Earth, so the satellite appears at a fixed position in the sky.

Detailed explanation-2: -Television signal are of high frequencies ( ranging from 47 MHZ to 960 MHZ) by which they cannot be reflected by ionosphere hence to reflect them satellite are essential. This is why satellites are used for long-distance T.V transmission.

Detailed explanation-3: -Doordarshan is a major user of INSAT satellites for providing television services over the country. At present, 33 Doordarshan TV channels are operating through C-band transponders of INSAT-3A, INSAT-3C, and INSAT-4B.

Detailed explanation-4: -All signals for television, telephone or internet are converted into radio signals and then sent towards the satellite using a transmitting satellite dish. Most satellite dishes are designed to only receive satellite signals, but some are used to send signals to satellites as well.

Detailed explanation-5: -So satellites are used for TV transmission to far places. Also communication satellite has an amplifier and transmitter which work with solar energy. The satellite amplifies the weak TV signals sent to it from the ground stations and them transmits them to the different ground stations from where they are relayed.