This site provides comprehensive, up-to-date, time-sensitive, and accurate information (*) for all FCC Part 90 Private Land Mobile Radio (LMR) voice dispatch, data, SCADA, telemetry and radio paging licensees, system managers, consultants, integrators, sales and service facilities and end-users subject to compliance with the January 1, 2013 VHF (150-174 MHz) and  UHF (421-470 MHz) Narrowbanding Mandate.

VHF/UHF licensees that anticipate the need for additional time beyond the January 1, 2013 deadline to complete the narrowbanding of their systems must request a waiver. The guidance contained in this  Public Notice  is intended to expedite the preparation and submission of waiver requests by licensees, as well as the review of such requests by the Public Safety and Homeland Security Bureau and the Wireless Telecommunications Bureau, consistent with the Commission's overarching goal of ensuring a timely transition to narrowband operations.

Also see  this waiver explanation  from the FCC.