Sec.  74.661   Frequency tolerance.

   Stations  in this service shall maintain the carrier frequency of each
   authorized transmitter to within the following percentage of the assigned
   frequency.
   Frequency band
   (MHz) Frequency tolerance (%)
         2,025 to 2,110         ^10.005
         2,450 to 2,483.5       ^20.001
         6,425 to 6,525           0.005
         6,875 to 7,125         ^10.005
         12,700 to 13,250       ^10.005
         17,700 to 18,820         0.003
         18,920 to 19,700         0.003

   ^1Television translator relay stations shall maintain a frequency tolerance
   of 0.002%.

   ^2Stations licensed pursuant to an application filed before March 17, 2005,
   for  tolerance values exceeding those specified above, may continue to
   operate  indefinitely  in  accordance  with the terms of their current
   authorizations,  subject  to  periodic renewal. Existing equipment and
   equipment of product lines in production before April 16, 2003, authorized
   via certification or verification before March 17, 2005, for tolerance
   values exceeding those specified above, may continue to be manufactured
   and/or marketed, but may not be authorized for use under station license
   except at stations licensed pursuant to an application filed before March
   17, 2005. Any non-conforming equipment authorized under a station license,
   and replaced on or after March 17, 2005, must be replaced by conforming
   equipment.

   [ 52 FR 7143 , Mar. 9, 1987, as amended at  68 FR 12772 , Mar. 17, 2003]