§ 90.263   Substitution of frequencies below 25 MHz.

   Frequencies below 25 MHz when shown in the radio pool frequency
   listings under this part will be assigned to base or mobile stations
   only upon a satisfactory showing that, from a safety of life
   standpoint, frequencies above 25 MHz will not meet the operational
   requirements of the applicant. These frequencies are available for
   assignment in many areas; however, in individual cases such assignment
   may be impracticable due to conflicting frequency use authorized to
   stations in other services by this and other countries. In such cases,
   a substitute frequency, if found available, may be assigned from the
   following bands: 1705-1750 kHz, 2107-2170 kHz, 2194-2495 kHz, 2506-2850
   kHz, 3155-3400 kHz, or 4438-4650 kHz. Since such assignments are in
   certain instances subject to additional technical and operation
   limitations, it is necessary that each application also include precise
   information concerning transmitter output power, type and directional
   characteristics, if any, of the antenna, and the minimum necessary
   hours of operation. (This section is not applicable to the
   Radiolocation Service, subpart F of this part.)

   [ 72 FR 35196 , June 27, 2007]

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