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Introduction: In analogue terrestrial television broadcasting only
one signal is transmitted on a given frequency channel. Digital
Terrestrial Television (DTT) broadcasting allows the transmission
of about 10 or more digital services in a single transmitter. In the
DTT broadcasting process everybody watches the same content
at the same time and it guarantees everybody the same high level
of service. DD has adopted DVB-T2 standard for DTT services
which are free-to-air.
Frequently Asked Questions (FAQ)
1. Why is Doordarshan going into digital terrestrial broadcasting ?
Doordarshan is giving terrestrial transmission of Analog Channels since 15th September 1959.
DD is migrating to digital terrestrial broadcasting as going digital will provide multiple
programme channels, better video and audio quality, availability of signals on mobile and
portable devices like handsets/tablets/PCs etc.
2. How to receive DVB –T2 Signals? Do I need to change my TV set now
to receive the DVB -T2 Signal?
It requires ordinary antenna (indoor or outdoor depending upon your location) as used
in analogue terrestrial TV. With the existing TV set, a DVB - T2 Set Top Box is required.
Some integrated Digital TV sets (iDTV) are available in market having in-built set top box
or DVB-T2 tuner. With these TV sets one needs only an antenna to be connected to TV
set for watching DTT channels.
3. How many TV Channels are available on DTT Platform?
For optimum coverage about 14 Standard Definition TV (SDTV) Channels or 4-5 High
Definition TV (HDTV)
Channels can be relayed
for fixed TV reception
mode or for mobile and
portable devices about 10
TV Channels can be
relayed. A combination of
channels for fixed TV and
mobile TV is also possible.
Currently 5 DD Channels
(DD National, DD News, DD Bharati, DD Sports and DD Regional/DD Kisan) and 2-3 Radio
Channels are being relayed on pilot basis in 16 cities.
4. In which cities DTT services are available?
DTT Transmitters have been installed in 19 Cities. These are: Ahmedabad, Jallandhar,
Aurangabad, Kolkata, Bengaluru, Lucknow, Bhopal, Mumbai, Chennai, Patna, Cuttack,
Raipur, Delhi, Ranchi, Guwahati, Indore, Srinagar, Hyderabad and Thiruvanathpuram.
Transmission in all above cities except that in Srinagar, Hyderabad and
Thiruvanathpuram, has started. In Hyderabad and Thiruvanathpuram test transmission
is going on and regular DTT service will start soon. DTT Services will be expanded in
additional 44 cities soon. The signal from DTT Transmitters is available up to about 60-
70 Km using indoor/outdoor antenna and upto 25-30 Km in mobile devices. For
reception on mobile devices, there may be some small shadow zones due to high rise
buildings etc. where signal may not be available at present. In future Gap fillers are
proposed to be installed for smooth coverage.