Sec. 90.729  Limitations on power and antenna height.

    (a) The permissible effective radiated power (ERP) with respect to 
antenna heights for land mobile, paging, or fixed stations transmitting 
on frequencies in the 220-221 MHz band shall be determined from the 
following Table. These are maximum values and applicants are required to 
justify power levels requested.

                    ERP vs. Antenna Height Table \2\                    
------------------------------------------------------------------------
                                                               Effective
                                                                radiated
     Antenna height above average terrain (HAAT), meters         power, 
                                                               watts \1\
------------------------------------------------------------------------
Up to 150....................................................        500
150 to 225...................................................        250
225 to 300...................................................        125
300 to 450...................................................         60
450 to 600...................................................         30
600 to 750...................................................         20
750 to 900...................................................         15
900 to 1050..................................................         10
Above 1050...................................................          5
------------------------------------------------------------------------
\1\ Transmitter PEP shall be used to determine ERP.                     
\2\ These power levels apply to stations used for land mobile, paging,  
  and fixed operations.                                                 

    (b) The maximum permissible ERP for mobile units is 50 watts. 
Portable units are considered as mobile units. Licensees operating fixed 
stations or paging base stations transmitting on frequencies in the 221-
222 MHz band may not operate such fixed stations or paging base stations 
at power levels greater than 50 watts ERP, and may not transmit from 
antennas that are higher than 7 meters above ground, except that 
transmissions from antennas that are higher than 7 meters above ground 
will be permitted if the effective radiated power of such transmissions 
is reduced below 50 watts ERP by 20 log10(h/7) dB, where h is 
the height of the antenna above ground, in meters.
    (c) Base station and fixed station transmissions on base station 
transmit Channels 196-200 are limited to 2 watts ERP and a maximum 
antenna height of 6.1 meters (20 ft) above ground. Licensees authorized 
on these channels may

[[Page 587]]

operate at power levels above 2 watts ERP or with a maximum antenna 
height greater than 6.1 meters (20 ft) above ground if:
    (1) They obtain the concurrence of all Phase I and Phase II 
licensees with base stations or fixed stations receiving on base station 
receive Channels 1-40 and located within 6 km of their base station or 
fixed station; and
    (2) Their base station or fixed station is not located in the United 
States/Mexico or United States/Canada border areas.
[ 62 FR 15996 , Apr. 3, 1997]