Sec.  22.727   Power limits for conventional rural radiotelephone transmitters.

   The transmitting power of transmitters operating on the channels listed in
    Sec. 22.725 must not exceed the limits in this section.

   (a) Maximum ERP. The effective radiated power (ERP) of central office and
   rural subscriber station transmitters must not exceed the applicable limits
   in this paragraph under any circumstances.
   Frequency range (MHz) Maximum ERP (watts)
   152–153                              1400
   157–159                               150
   454–455                              3500
   459–460                               150

   (b) Basic power limit. Except as provided in paragraph (d) of this section,
   the ERP of central office station transmitters must not exceed 500 Watts.

   (c)  Height-power  limits. Except as provided in paragraph (d) of this
   section, the ERP of central office station transmitters must not exceed the
   amount that would result in an average distance to the “service contour” of
   41.6 kilometers (26 miles) for VHF channels or 30.7 kilometers (19 miles)
   for  UHF  channels.  The  average distance to the “service contour” is
   calculated by taking the arithmetic mean of the distances determined using
   the  procedures  specified  in   Sec. 22.567  for the eight cardinal radial
   directions, excluding cardinal radial directions for which 90% or more of
   the distance so calculated is over water.

   (d)  Encompassed  interfering  contour  areas.  Central office station
   transmitters are exempt from the basic power and height-power limits of this
   section if the area within their interfering contours is totally encompassed
   by the interfering contours of operating co-channel central office station
   transmitters  controlled by the same licensee. For the purpose of this
   paragraph, operating transmitters are authorized transmitters that are
   providing service to subscribers.

   (e)  Adjacent  channel  protection.  The ERP of central office station
   transmitters must not exceed 500 Watts if they transmit on channel 454.025
   MHz and are located less than 7 kilometers (4.3 miles) from any Private
   Radio Services station receiving on adjacent channel 454.000 MHz.

   [ 59 FR 59507 , Nov. 17, 1994, as amended at  70 FR 19309 , Apr. 13, 2005]