What is DTH and how it works?

What is DTH and how does it work?

DTH (Direct To Home) is a satellite-aided TV rebroadcast system, featuring a compressed digital encoded signal for uplink/downlink.

The first step in creating the digital satellite system is to raise the satellites. This requires a launch missile to raise it to a low-earth geosynchronous orbit (18,000 mph at 22,500 miles). "Geosynchronous" means that the satellite maintains a constant position relative to the earth. A geosynchronous orbit ensures that the antenna does not need to be re-positioned. Each DTH satellite has at least 16 transponders, and each transponder has multiple channels possible because of the digital signal compression and alternately using polarization.

With the satellites in place, a DTH broadcast requires an Earth station for uplink. "Uplink" refers to sending data up to the satellite, which then retransmits the data down (downlink) along a particular angle.

In order to receive DTH, you need the following components:

• Antenna
• LNB
• Receiver

DTH (Direct To Home) Systems...

• Have smaller dishes, usually 18" round or 18 x 24" elliptical.
• Operate on Ku-band at 11.7 GHz to 12.2 GHz.
• Feature digital video.
• Have no unscrambled channels and require an appropriate receiver for that system (DISH Network™).
• Use satellites which are owned by EchoStar
  EchoStar Corp. provides service for DISH Network.

DTH Receiver

The receiver is connected to the LNB via 75-ohm Coaxial cable and tunes the radio frequencies to receive and display each channel. For proper operation, the receiver should have a valid access card, the card contains a microprocessor, which supplies the decoding sequence for the receiver and controls channel access and billing.