Seminar Coordinator :Mr. Dharmendra Verma
Presented By :Neeraj Shukla
( 1001131029 )
( E.C. 3rd Year )
Department Of Electronics and
Subharti Institute Of Technology And
• Specifications and Features
• Benefits and Limitations
DTH stands for Direct-To-Home
The Direct-To-Home (DTH) service is a digital satellite service that
provides television services direct to subscriber.
DTH does away with the need for the local cable
operator and puts the broadcaster directly in touch
The installation of a DTH Television consists of :
A Dish Antenna (60 to 90 cm) in diameter
A Conventional TV set
Set top box
Coaxial Cable between dish and set top box
The frequencies for DTH vary from region to
region but it lies in Ku band of microwave .
Uplink frequency range – 17.3 to 17.8 GHz
Downlink frequency range – 12.2 to 12.7
An electronically controlled polarizer is used
at receiving terminal for converting circularly
received polarized signal to linearly polarized
A DTH – TV satellite carries up to 32 high
Digital TV signals are transmitted as 20 Mbps
QPSK signal occupying about 27 MHz of
transponder bandwidth for a single channel.
MPEG-2 format is used for video
Some of the features of DTH service are as following:
DTH offers better quality picture than Cable TV.
DTH can reach remote areas where terrestrial transmission and cable TV
have failed to reach.
DTH also allows for interactive TV services such as movie-on-demand,
In DTH, the payments will be made directly by the subscriber to the
satellite company offering the service.
The programming source are
simply the channels that
provide programming for
Satellite TV provider get
programming from two major
Channels(such as HBO,ESPN
& CNN)& various Local
These channels usually have
a distribution center that
beams their programming to
a geostationary satellite.
Set Top Box
A satellite dish is just a special kind of antenna
designed to focus on a specific broadcast
source. The standard dish consists of a
parabolic (bowl-shaped) surface and a central
feed horn. To transmit a signal, a controller
sends it through the horn, and the dish focuses
the signal into a relatively narrow beam.
The dish on the receiving end can’t transmit
information; it can only receive it. The
receiving dish works in the exact opposite way
of the transmitter.
When a beam hits the curved dish, the parabola
shape reflects the radio signal inward onto a
particular point, just like a concave mirror
focuses light onto a particular point.
The curved dish focuses incoming radio waves
onto the feed horn.
The central element in the feed horn is low noise block-down converter.
Block-down convertor (so called because it converts a whole band or
‘block of frequencies’ to a lower band) i.e. it converts the 12.2 to 12.7 GHz
band to 950 to 1450 MHz
An LNB sits on the end of an arm and faces the parabolic reflector(dish)
which focuses the signals from a satellite into the feed horn of the LNB.
› The basic Set Top Box (STB) takes the signal from the satellite dish and
converts it into a signal that can be used by a TV, sound amplifier, etc.
› STBs can act as a gateway between a television or PC and telephone,
satellite, terrestrial or cable feed.
› The STB also accepts commands from the user and transmits these
commands back to the network operator.
Cost effective communication,
information and entertainment to all.
Small size terminal can provide up to
4000 channels and 2000 radio
channels through a click of button
and thus bring world’s information,
news entertainment to your home.
DTH services bypasses mediators and
thus content provider comes with
DTH services are transparent
providing digital quality video, audio,
radio, and IP to all at equal prices and
other benefits with reliability.
Under unfavourable climatic conditions the service remains
• The service is interrupted in case if the direction of dish is
• Transmission gets interrupted due to sun outage.
Geostationary satellite plays an
important role for DTH system.
They are positioned at an exact height
of 36,000 km above earth.
They solve the problem of range and
distortion by transmitting broadcast
It is a way to give a specific direction
to a transmitted signal.
Signal transmitted by satellite can be
polarized as linear(horizontal and
vertical) or circular(left hand or right
Direct To Home Technology connects urban , rural and
remote areas of the country and provide desire information,
communication, education and entertainment at the click of