Amateur radio frequency bands in India are used by over 16,000 licenced users of amateur radio. Five categories of licences are granted by the Wireless and Planning and Coordination Wing (WPC), a branch of the Ministry of Communications and Information Technology. In addition, the WPC allocates frequency spectrum in India. To obtain a licence in the first four categories, candidates must pass the Amateur Station Operator's Certificate examination conducted by the WPC. This exam is held monthly in Delhi, Mumbai, Kolkata and Chennai, every two months in Ahmedabad, Nagpur and Hyderabad, and every four months in some smaller cities. After passing the examination, the candidate must clear a police interview. Each licence category has certain privileges allotted to it, including the allotment of frequencies, output power, and the emission modes. (Full list...)