Section 73.1705 - Time of operation(a) Commercial and noncommercial educational TV and commercial FM stations will be licensed for unlimited time operation. Application may be made for voluntary share-time operation.(b) Noncommercial educational FM stations will be licensed for unlimited and share time operation according to the provisions of § 73.561 .(c) AM stations in the 535-1705 kHz band will be licensed for unlimited time. In the 535-1605 kHz band, stations that apply for share time and specified hours operations may also be licensed. AM stations licensed to operate daytime-only and limited-time may continue to do so; however, no new such stations will be authorized, except for fulltime stations that reduce operating hours to daytime-only for interference reduction purposes.43 FR 45849, Oct. 4, 1978, as amended at 56 FR 64872, Dec. 12, 1991