Goto Section: 22.623 | 22.627 | Table of Contents
Revised as of September 1, 2021
Goto Year:2020 |
§ 22.625 Transmitter locations.
This section governs where point-to-multipoint transmitters on the
channels listed in § 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
(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
Urban area N. latitude W. longitude
Boston, MA 42Â°21â€²24.4â€³ 71Â°03â€²22.2â€³
Chicago, IL 41Â°52â€²28.1â€³ 87Â°38â€²22.2â€³
Cleveland, OH 41Â°29â€²51.2â€³ 81Â°41â€²49.5â€³
Dallas, TX 32Â°47â€²09.5â€³ 96Â°47â€²38.0â€³
Detroit, MI 42Â°19â€²48.1â€³ 83Â°02â€²56.7â€³
Houston, TX 29Â°45â€²26.8â€³ 95Â°21â€²37.8â€³
Los Angeles, CA 34Â°03â€²15.0â€³ 18Â°14â€²31.3â€³
Miami, FL 25Â°46â€²38.6â€³ 80Â°11â€²31.2â€³
New York, NY 40Â°45â€²6.4â€³ 73Â°59â€²37.5â€³
Philadelphia, PA 39Â°56â€²58.4â€³ 75Â°09â€²19.6â€³
Pittsburgh, PA 40Â°26â€²19.2â€³ 79Â°59â€²59.2â€³
San Francisco-Oakland, CA 37Â°46â€²38.7â€³ 122Â°24â€²43.9â€³
Washington, DC 38Â°53â€²51.4â€³ 77Â°00â€²31.9â€³
Note: Coordinates are referenced to North American Datum 1983 (NAD 83).
(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
(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 milesâ€”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 38Â°57â€²17â€³ 77Â°00â€²17â€³
476-482 MHz Lancaster, PA 40Â°15â€²45â€³ 76Â°27â€²49â€³
(ii) The distance to the radio horizon is calculated using the
eCFR graphic er17no94.008.gif
View or download PDF
d is the distance to the radio horizon in kilometers
h is the height of the antenna center of radiation above ground level
[ 59 FR 59507 , Nov. 17, 1994, as amended at 63 FR 68946 , Dec. 14, 1998,
70 FR 19309 , Apr. 13, 2005]
Goto Section: 22.623 | 22.627
Goto Year: 2020 |
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