The radio station commenced operation under the brand 'S' FM through South Asia FM Ltd -- a subsidiary of Sun TV, the company informed the Bombay Stock Exchange.
The station would air programmes for all age groups and can be heard at 93.5 MHz frequency at Varanasi, it said.
With this, the total number of FM radio stations operating under the Sun TV Network goes up to 18, including those in Chennai, Coimbatore, Tirunelveli, Visakhapatnam, Bangalore, Hyderabad, Jaipur, Bhubaneswar, Tirupati, Madurai, Tuticorin, Lucknow, Bhopal, Puducherry, Kozhikode, Indore and Vijayawada.
Sun TV Network holds licence for 45 FM radio stations across India and when all the remaining 27 stations become operational, the company would become one of the largest radio broadcasters in the country, it added.
Earlier this month, the company launched a radio station in Kozhikode and Vijayawada being operated under the brand 'S' FM through Kal Radio Ltd and another station in Indore being operated through South Asia FM Ltd -- a subsidiary of Sun TV.
Shares of Sun TV Network closed at Rs 405, down 0.44 per cent on the BSE.