DTH( DIRECT TO HOME)
We love watching Tv right. and spend lot of time on watching favorite films, serials, events programs so on.
Present we use mostly DTH. have you ever thought that how DTH working ??
If yes comment below.
DTH(direct to home) that means dish which reach our house without any wire's.
TERRISTREAL BROADCASTING..
In our childhood days the only channel we have "dhurdharshan" radio signals which transmit to small signal tower and connect to TV with wire and TV converts radio signals into picture
There are few disadvantages .
Radio signals cannot transmit to longer distance so people staying in longer distance not able to receive signals.
To overcome this problem the tv studio send signal to satellite then satellite send signals to multiple system operates (MSO)
we generally called cable operators. you may observe large antenna's on top of cable operators home from cable operators home connects all the homes using wires ..
We have many disadvantages.
As dish wire length increases then strength of the signal decreases so we face low picture and sound quality sometimes we see grains on screen. cable operators put amplifier for every 300 meters also we face problems in quality. we pay money for unwanted channels.
In 2003 dish tv has introduced this technology in India .in space there are lot of satellite either India or foreign. every satellite have transponders this transponders receive the signals and send direct to antenna which is top of your home every transponders receive 5 to 10 channel's. satellite are in space about 36000 kilometers away.in geostationary orbit it means the satellite rotate to match the speed of the earth this because satellite remain in same position to transmit signals.
There are 6 DTH Operators sun direct, dish tv, airtel, big tv, free dish
Antenna is in curved shape because every signal that incident on antenna that reach same point. different satellite have different direction so antenna is in different positions.
This feature technology which is very useful because we use optical fiber cables to every home instead of using satellites so cost may reduce and also we use internet to.
I hope you learn something new. thank you