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.

------------------------------------------------------------------------
                                                             Maximum ERP
                   Frequency range (MHz)                       (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.
    (f) Meteor burst stations. The transmitter output power for stations 
using meteor burst propagation modes must not exceed 2000 Watts for 
central office stations and 500 Watts for rural subscriber stations.