In September 1935, broadcasting began in the princely State of Mysore with the name AKASHVANI. The name All India Radio was adopted from June 08, 1936 and the Delhi Station of the Indian State Broadcasting Service went on air on January 01, 1936 from the temporary studios at 18, Alipur Road.
Dr. Gopalaswamy Professor of Psychology at the Mysore University had set up a 30 Watt transmitter at his house to air the first broadcast in the year 1935. By the end of 1932 when the BBC started its Empire Service, the number of receivers in India was 8557. It increased to 10,872 by the end of 1933 & 16,000 by the end of 1934. Today, AIR covers 99.19% of total Indian population. It Broadcasts via DTH,live streams several AIR channels and updates through various social networking platforms.
Source and full details : http://akashvanisamvaad.blogspot.in/2015/07/indian-broadcasting-day-23rd-july-1923.html