Sec. 90.283  Inter-service sharing of maritime frequencies in the 156-
          162 MHz band.

    (a) The following frequency pairs may be assigned to any eligible 
applicant that meets the definition of a Power, Petroleum, Forest 
products, Film and video production, Relay press, Special industrial, 
Manufacturers, Telephone maintenance, Motor carrier, Railroad, Taxicab, 
or Automobile emergency licensee, as defined in Sec. 90.7, for licensing 
in the Industrial/Business Pool for duplex operation within the 48 
contiguous states in accordance with the rules of Sec. 90.35, the 
conditions set forth in this section, and the CANADA/U.S.A. channeling 
agreement for VHF maritime public correspondence found in Sec. 80.57 of 
this chapter.

                             Frequency (MHz)                            
------------------------------------------------------------------------
                                                          Mobile station
                 Mobile station transmit                     transmit   
------------------------------------------------------------------------
157.200.................................................     161.800    
157.20625 \1\...........................................  \1\ 161.80625 
157.2125 \2\............................................  \2\ 161.8125  
157.21875 \1\...........................................  \1\ 161.81875 
157.225.................................................     161.825    
157.23125 \1\...........................................  \1\ 161.83125 
157.2375 \2\............................................  \2\ 161.8375  
157.24375 \1\...........................................  \1\ 161.84375 
157.250.................................................     161.850    
157.25625 \1\...........................................  \1\ 161.85625 
157.2625 \2\............................................  \2\ 161.8625  
157.26875 \1\...........................................  \1\ 161.86875 
157.275.................................................     161.875    
157.28125 \1\...........................................  \1\ 161.88125 
157.2875 \2\............................................  \2\ 161.8875  
157.29375 \1\...........................................  \1\ 161.89375 
157.300.................................................     161.900    
157.30625 \1\...........................................  \1\ 161.90625 
157.3125 \2\............................................  \2\ 161.9125  
157.31875 \1\...........................................  \1\ 161.91875 
157.325.................................................     161.925    
157.33125 \1\...........................................  \1\ 161.93125 
157.3375 \2\............................................  \2\ 161.9375  
157.34375 \1\...........................................  \1\ 161.94375 
157.350.................................................     161.950    
157.35625 \1\...........................................  \1\ 161.95625 
157.3625 \2\............................................  \2\ 161.9625  
157.36875 \1\...........................................  \1\ 161.96875 

[[Page 491]]

                                                                        
157.375.................................................     161.975    
157.38125 \1\...........................................  \1\ 161.98125 
157.3875 \2\............................................  \2\ 161.9875  
157.39375 \1\...........................................  \1\ 161.99375 
157.400.................................................     162.000    
------------------------------------------------------------------------
\1\ This frequency will be assigned with an authorized bandwidth not to 
  exceed 6 kHz.                                                         
\2\ This frequency will be assigned with an authorized bandwidth not to 
  exceed 11.25 kHz.                                                     

    (b) Assignment will be made only when VHF frequencies available for 
assignment under this part are unavailable due to congestion, as 
determined by a certified private land mobile frequency coordinator. 
Applicants must provide evidence of frequency coordination in accordance 
with Sec. 90.175.
    (c) Station power, as measured at the output terminals of the 
transmitter, must not exceed 50 watts for base stations and 20 watts for 
mobile stations, except in accordance with the provisions of paragraph 
(g) of this section. Antenna height (HAAT) must not exceed 122 meters 
(400 feet) for base stations and 4.5 meters (15 feet) for mobile 
stations, except in accordance with paragraph (g) of this section. Such 
base and mobile stations must not be operated on board aircraft in 
flight.
    (d) The following table, along with the antenna height (HAAT) and 
power (ERP), must be used to determine the minimum separation required 
between proposed base stations and each of the following:
    (1) Co-channel public coast stations licensed under part 80 of this 
chapter,
    (2) The coastline of any navigable waterway,
    (3) Grandfathered public safety licensees operating on 157.35 MHz or 
161.85 MHz. Applicants whose exact ERP or HAAT are not reflected in the 
table must use the next highest figure shown.

         Required Separation in Kilometers (Miles) of Base Station From Coastlines/Public Coast 
Stations        
------------------------------------------------------------------------------------------------
----------------
                                          Base Station Characteristics                          
                
------------------------------------------------------------------------------------------------
-----------------
                           HAAT                                                 ERP (watts)     
                
------------------------------------------------------------------------------------------------
----------------
                      Meters (feet)                           400        300        200        1
00         50   
------------------------------------------------------------------------------------------------
----------------
15 (50)..................................................   138 (86)   135 (84)   129 (80)   121
 (75)   116 (72)
30 (100).................................................   154 (96)   151 (94)   145 (90)   137
 (85)   130 (81)
61 (200).................................................  166 (103)  167 (104)  161 (100)   153
 (95)   145 (90)
122 (400)................................................  187 (116)  177 (110)  183 (114)  169 
(105)   159 (99)
------------------------------------------------------------------------------------------------
----------------

    (e) In the event of interference, the Commission may require, 
without a hearing, licensees of base stations authorized under this 
section that are located within 241 kilometers (150 miles) of an 
existing, co-channel public coast station, grandfathered co-channel 
public safety station or an international border to reduce radiated 
power, decrease antenna height, and/or install directional antennas. 
Mobile stations must operate only within radio range of their associated 
base station.
    (f) Individual waiver requests to operate on a secondary, non-
interference, basis will be considered in cases where the applicant's 
base station satisfies the requirements of paragraphs (d) (1) and (3) of 
this section but does not satisfy the requirements of paragraph (d)(2) 
of this section. All waiver requests must be submitted in accordance 
with Sec. 1.931 of the chapter. Such secondary operations must cease 
immediately upon notification by the Commission that the station is 
causing interference to maritime operations.
    (g) Applicants seeking to be licensed for stations exceeding the 
power/antenna height limits of the table in paragraph (d) of this 
section are required to secure a waiver and must submit with the 
application, an interference analysis, based upon any of the generally-
accepted terrain-based propagation models, that shows that co-channel 
protected entities, described in paragraph (d) of this section, would 
receive the same or greater interference protection than provided in the 
table.
[ 60 FR 35510 , July 10, 1995, as amended at  62 FR 2041 , Jan. 15, 1997;  62 FR 18932 , Apr. 17, 1997]

[[Page 492]]


    Effective Date Note: At  62 FR 18932 , Apr. 17, 1997, Sec. 90.283 was 
amended by revising the introductory text of paragraph (a), effective 
Oct. 17, 1997.

    Subpart L--Authorization in the Band 470-512 MHz (UHF-TV Sharing)