DD National or DD1 is Doordarshan's flagship channel and the most widely available terrestrial television channel in India.
The channel began broadcast on an experimental basis on September 15, 1959 from a makeshift studio at Akashvani Bhavan in New Delhi as part of All India Radio. It started with 20 TV receivers in and around Delhi and transmitted one hour educational and developmental programs twice a week. Regular daily transmission started in 1965.
In 1976, the Indian government constituted Doordarshan, the public television broadcaster, as a separate Department under the Ministry of Information and Broadcasting.
Its symbol resembles with Angara,Gondwana and Sea of early timing of earth formation.
For the first few years after its inception, the channel only aired educational and informative programs with news being one of the biggest draw. Once the national feed started in 1982, the channel started airing regional and local shows on time-sharing basis. For most Indian states, this meant one national and one local news telecast. The channel soon started airing entertainment shows and popularity of some of the earliest series such as Hum Log, film-based shows such as Chitrahaar and Hindi movies resulted in a gradual increase in entertainment and commercial programming.
Till mid-80s, channel transmission was limited to evenings only. On February 11, 1987, the channel introduced morning transmission with a two hour telecast. This included ten minute news bulletins in Hindi and English apart from other short shows. On January 1, 1989, afternoon transmission, aimed at housewives and children, was launched.
The channel's educational programming includes distance learning shows for UGC and IGNOU as well as learning shows for kids sponsored by NCERT.
Since late-90s, the channel broadcasts from 4:30 am IST till 2:00 am terrestrially while the satellite feed is available 24 hours a day.