Sec. 22.565  Transmitting power limits.

    The transmitting power of base, mobile and fixed transmitters 
operating on the channels listed in Sec. 22.561 must not exceed the 
limits in this section.
    (a) Maximum ERP. The effective radiated power (ERP) of base and 
fixed 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 base transmitters must not exceed 500 Watts.
    (c) Height-power limits. Except as provided in paragraph (d) of this 
section, the ERP of base 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. Base 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 based 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 base and fixed 
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 454.0000 
MHz.
    (f) Mobile transmitters. The transmitter output power of mobile 
transmitters must not exceed 60 watts.
    (g) Other transmitters. The ERP of dispatch and auxiliary test 
transmitters must not exceed 100 watts.