Sec. 90.267  Assignment and use of frequencies in the 450-470 MHz band 
          for low-power use.

    (a) Any regularly assignable frequency in the 450-470 MHz band 
listed in the tables in subparts B and C of this part may be designated 
by the frequency coordinators as a low-power channel in a defined 
geographic area. These channels are subject to the following conditions.
    (1) [Reserved]
    (2) Assignments are subject to the frequency coordination 
requirements of Sec. 90.175.
    (3) Stations are limited to 2 watts output power and will be 
licensed as mobile, but may serve the functions of base, fixed, or 
mobile relay stations.
    (4) Wide area operations will not be authorized. The area of normal 
day-to-day operations will be described in the application in terms of 
maximum distance from a geographical center (latitude and longitude).
    (5) A hospital or health care institution holding a license to 
operate a radio station under this part may operate a medical radio 
telemetry device with an output power not to exceed 20 milliwatts 
without specific authorization from the Commission. All licensees 
operating under this authority must comply with the requirements and 
limitations set forth in this section.
    (6) Each coordinator must maintain a list of all channels designated 
for low-power use and the geographic areas where such channels are 
available. The coordinator must make this list available to the public 
upon request.
    (7) Antennas of mobile stations used as fixed stations communicating 
with one or more associated stations located within 45 degrees of 
azimuth shall be directional and have a front to back ratio of at least 
15 dB. Except as provided in this paragraph (b)(7), the height of the 
antenna used at any mobile station serving as a base, fixed or mobile 
relay station may not exceed 7 m. (20 ft) above the ground level.
    (i) No limit shall be placed on the length or height above ground 
level of any commercially manufactured radiating transmission line when 
the transmission line is terminated in a non-radiating load and is 
routed at least 7 m. (20 ft) interior to the edge of any structure or is 
routed below ground level.
    (ii) Only sea-based stations, and central alarm stations operating 
on frequencies allocated for central station protection operations, may 
utilize antennas mounted not more than 7 m. (20 ft.) above a man-made 
supporting structure, including antenna structures.

[[Page 485]]

    (b) [Reserved]
[ 60 FR 37268 , July 19, 1995, as amended at  61 FR 4235 , Feb. 5, 1996;  62 FR 2041 , Jan. 15, 1997;  62 FR 18929 , Apr. 17, 1997]

    Effective Date Note: At  62 FR 18929 , Apr. 17, 1997, Sec. 90.267 was 
amended by revising the introductory text of paragraph (a) and 
paragraphs (a)(2) and (a)(6) and removing and reserving paragraph 
(a)(1), effective Oct. 17, 1997.