§ 90.261   Assignment and use of the frequencies in the band 450-470 MHz for
fixed operations.

   (a) Frequencies in the 450-470 MHz band as listed in § § 90.20(c)(3) and
   90.35(b)(3) may be assigned to all eligibles for fixed use on a secondary
   basis to land mobile operations.

   (b) Fixed stations located 140 km (87 mi) or more from the center of any
   urbanized area of 600,000 or more population are limited to a transmitter
   output power of 75 watts. Fixed stations less than 140 km (87 mi) from the
   centers of these areas are limited to a transmitter output power of 20
   watts. Urbanized areas of 600,000 or more population are defined in the U.S.
   Census of Population 1970, Vol. 1, Table 20, pages 1-74. The centers of the
   urbanized areas are determined from the Appendix, page 226, of the U.S.
   Department of Commerce publication “Airline Distance Between Cities in the
   United States.”

   (c) All fixed systems are limited to one frequency pair with 5 MHz spacing
   and must employ directional antennas with a front-to-back ratio of 15dB,
   except that omnidirectional antennas having unity gain may be employed by
   stations  communicating  with  a  minimum of three receiving locations
   encompassed in a sector of at least 160�° in azimuth. Stations authorized for
   secondary fixed operations prior to July 13, 1992, may continue to operate
   under the conditions of their initial authorization.

   (d)-(e) [Reserved]

   (f) Secondary fixed operations pursuant to paragraph (a) of this section
   will  not be authorized on the following frequencies or on frequencies
   subject to § 90.267:

Frequencies (MHz)

   451.800/456.800        454.000/459.000
   451.80625/456.80625    454.00625/459.00625
   451.8125/456.8125      454.0125/459.0125
   451.81875/456.81875    454.01875/459.01875
   452.525                462.950/467.950
   452.53125              462.95625/467.95625
   452.5375               462.9625/467.9625
   452.54375              462.96875/467.96875
   452.550                462.975/467.975
   452.55625              462.98125/467.98125
   452.5625               462.9875/467.9875
   452.56875              462.99375/467.99375
   452.575                463.000/468.000
   452.58125              463.00625/468.00625
   452.5875               463.0125/468.0125
   452.59375              463.01875/468.01875
   452.600                463.025/468.025
   452.60625              463.03125/468.03125
   452.6125               463.0375/468.0375
   452.61875              463.04375/468.04375
   452.925/457.925        463.050/468.050
   452.93125/457.93125    463.05625/468.05625
   452.9375/457.9375      463.0625/468.0625
   452.94375/457.94375    463.06875/468.06875
   452.950/457.950        463.075/468.075
   452.95625/457.95625    463.08125/468.08125
   452.9625/457.9625      463.0875/468.0875
   452.96875/457.96875    463.09375/468.09375
   453.025/458.025        463.100/468.100
   453.03125/458.03125    463.10625/468.10625
   453.0375/458.0375      463.1125/468.1125
   453.04375/458.04375    463.11875/468.11875
   453.075/458.075        463.125/468.125
   453.08125/458.08125    463.13125/468.13125
   453.0875/458.0875      463.1375/468.1375
   453.09375/458.09375    463.14375/468.14375
   453.125/458.125        463.150/468.150
   453.13125/458.13125    463.15625/468.15625
   453.1375/458.1375      463.1625/468.1625
   453.14375/458.14375    463.16875/468.16875
   453.175/458.175        463.175/468.175
   453.18125/458.18125    463.18125/468.18125
   453.1875/458.1875      463.1875/468.1875
   453.19375/458.19375    463.19375/468.19375

   [ 57 FR 24992 , June 12, 1992, as amended at  58 FR 33212 , June 16, 1993;  60 FR 37268 , July 19, 1995;  62 FR 18928 , Apr. 17, 1997;  68 FR 19461 , Apr. 21,
   2003;  72 FR 35196 , June 27, 2007]

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