§  22.727   Power limits for conventional rural radiotelephone transmitters.

   The transmitting power of transmitters operating on the channels listed
   in § 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 § 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]