Sec. 22.625  Transmitter locations.

    This section governs where point-to-multipoint transmitters on the 
channels listed in Sec. 22.621 may be located.
    (a) 928-960 MHz. In this frequency range, the required minimum 
distance separation between co-channel fixed transmitters is 113 
kilometers (70 miles). However, this requirement may be waived if the 
applicant submits an engineering analysis that shows that no 
interference would be caused to either system. In such a case, a 
developmental authorization may be issued (see Sec. 22.415). If no 
interference is experienced during the term of the developmental 
authorization, the licensee may apply for a regular authorization.
    (b) 470-512 MHz. The purpose of the rule in paragraph (b)(1) of this 
section is to define the areas in which the 470-512 MHz channels are 
allocated for public mobile use. The purpose of the rules in paragraphs 
(b)(2) and (b)(3) of this section is to reduce the likelihood that 
interference to television reception from public mobile operations on 
these channels will occur.
    (1) Control transmitter locations. Control transmitter locations 
must be within 80 kilometers (50 miles) of the designated locations in 
this paragraph.

------------------------------------------------------------------------
                                                                  W.    
                  Urban area                    N. latitude   longitude 
------------------------------------------------------------------------
Boston, MA....................................  42 deg.21'2             
                                                         4'  71 deg.03'2
                                                                      4'
Chicago, IL...................................  41 deg.52'2             
                                                         8'  87 deg.38'2
                                                                      2'
Cleveland, OH.................................  41 deg.29'5             
                                                         1'  81 deg.41'5
                                                                      0'
Dallas, TX....................................  32 deg.47'0             
                                                         9'  96 deg.47'3
                                                                      7'
Detroit, MI...................................  42 deg.19'4             
                                                         8'  83 deg.02'5
                                                                      7'
Houston, TX...................................  29 deg.45'2             
                                                         6'  95 deg.21'3
                                                                      7'
Los Angeles, CA...............................  34 deg.03'1             
                                                         5'  118 deg.14'
                                                                     28'
Miami, FL.....................................  25 deg.46'3             
                                                         7'  80 deg.11'3
                                                                      2'
New York, NY..................................  40 deg.45'0             
                                                         6'  73 deg.59'3
                                                                      9'
Philadelphia, PA..............................  39 deg.56'5             
                                                         8'  75 deg.09'2
                                                                      1'
Pittsburgh, PA................................  40 deg.26'1             
                                                         9'  80 deg.00'0
                                                                      0'
San Francisco-Oakland, CA.....................  37 deg.46'3             
                                                         9'  122 deg.24'
                                                                     40'
Washington, DC................................  38 deg.53'5             
                                                         1'  77 deg.00'3
                                                                      3'
------------------------------------------------------------------------

    (2) Protection from intermodulation interference. Control 
transmitter locations must be at least 1.6 kilometers (1 mile) from the 
main transmitter locations of all TV stations transmitting on TV 
channels separated by 2, 3, 4, 5, 7, or 8 TV channels from the TV 
channel containing the frequencies on which the control station will 
transmit. This requirement is intended to reduce the likelihood of 
intermodulation interference.

[[Page 165]]

    (3) Co-channel protection from control transmitters with high 
antennas. This paragraph applies only to control transmitters that 
utilize an antenna height of more than 152 meters (500 feet) above 
average terrain. The distance between the location of such a control 
transmitter and the applicable protected TV station location specified 
in this paragraph must equal or exceed the sum of the distance from the 
control transmitter location to the radio horizon in the direction of 
the specified location and 89 kilometers (55 miles--representing the 
distance from the main transmitter location of the TV station to its 
Grade B contour in the direction of the control transmitter). The 
protected TV station locations in this paragraph are the locations of 
record as of September 1974, and these do not change even though the TV 
stations may have been subsequently relocated.
    (i) The protected TV station locations are as follows:

------------------------------------------------------------------------
  Control transmitter frequency range     Protected TV station location 
------------------------------------------------------------------------
470-476 MHz............................  Washington, DC 38 deg.57'17' 77
                                          deg.00'17'                    
476-482 MHz............................  Lancaster, PA 40 deg.15'45' 76 
                                          deg.27'49'                    
------------------------------------------------------------------------

    (ii) The distance to the radio horizon is calculated using the 
following formula:
[GRAPHIC] [TIFF OMITTED] TR17NO94.008

where

d is the distance to the radio horizon in kilometers
h is the height of the antenna center of radiation above ground level in 
meters