DTH Technical Details

The Direct-to-Home (DTH) television services exclusively utilize the Direct Broadcasting Satellite (DBS) technology. This DBS technology enables the service-provider for broadcasting higher quality satellite signals with a large number of channels. In ours this very informative, enlightening, and beneficial web article, we are providing rich and refined information concisely regarding the dth technical details, and the dth technology in india.

The digital broadcast satellite transmits certain programming in the Ku Frequency range, which ranges from 10 GHz to 14 GHz, and provides highly qualitative pictures and sound. There are five pivotal and most significant components involved in the whole DTH satellite system; these are the Programming Source, the Broadcast Center, the Geostationary Satellite, the Satellite Dish, and the Receiver.

The Broadcaster Center or Broadcast Station is the central hub of the entire broadcasting system. At this vital station, signals rendered by the programming source(s) are firstly received, then digitally compressed using MPEG-2 or MPEG-4 technology, and thereafter encrypted, before transmitting the compressed signals to the Geostationary Satellite for further processing. The high-powered geostationary satellite receives the compressed and encrypted signals, duly amplifies these, and beams these back to the earth, so that these could be received by the dishes which are given to the DTH consumers by the DTH service-provider. The viewer's dish readily picks up the transmitted signals from the satellite, and passes these on to The Receiver, for further processing and then finally depicting the programmed picture on the TV Screen.

DTH Technology in India

The dth technology described above, are used extensively also in India, by the DTH service-providers of the country. The digital compression is essential for transmitting a substantially large number of channels by the satellite. After compression of the audio and video images and sounds, the DTH service-provider needs to encrypt these contents, in order to avert utilization of the broadcast signals for free, especially by the people who are not the consumers of the dth services of this service provider. The satellite dish of the DTH consumer is a special antenna which is ingeniously designed to focus on any certain and specific broadcast source. The technical details of some of the most popular and leading DTH service providers of India are given below: E stands for Encryption.

DTH Service Satellite Frequency
(MHz)
Symbol
Rate (KS)
FEC Compression Standard/
Modulation
E
Encrypt.
Videocon
d2h
ST-1 at
88.0 degree E
11485 to
11674
(Horizontal and Vertical
Polarizations)
43979 2/3 and
3/5
MPEG-4 DVB-S2/
8PSK
Irdeto 2
Airtel Digital TV SES-7 at
108.2 degree E
11480 to
11680
(Horizontal and Vertical)
25000 to
30000
2/3
And
3/4
MPEG-4 DVB-S2/
8PSK
Video
guard
Reliance
Digital TV
Measat-3
At
91.5 degree E
12523 to
12723
(Horizontal and Vertical)
30000 and
27500
3/4, 5/6, and
7/8
MPEG-4 DVB-S/
QPSK

DVB-S2/
8PSK (for HD)

Media
guard
Sun Direct HD Insat-4B at
93.5 degree E
11030
(Vertical Polarization)
30000 3/4 MPEG-4/HD DVB-S2/
8PSK
Irdeto 2
Tata Sky Insat-4A
At
83.0 degree E
10970 to
11670
(Horizontal)
30000 and
27500
5/6,
3/4
And
7/8
MPEG-2
MPEG-4 (HD)
DVB-S/
QPSK

DVB-S2/
8PSK (HD)

Video
guard
DD Direct
Plus
Insat-4B
At
93.5 degree E
10990 to
11570
(Vertical
Polarization)
27500 3/4 MPEG-2 DVB-S/
QPSK
Free-to-Air
Dish TV
HD
AsiaSat-5
At
100.5 degree E
12583 to
12703
(Vertical
Polarization)
40700 2/3 MPEG-4 DVB-S2/
8PSK
Conax