Sec.  90.103   Radiolocation Service.

   (a) Eligibility. The following persons are eligible for authorizations in
   the Radiolocation Service to operate stations to determine distance,
   direction, speed, or position by means of radiolocation devices, for
   purposes other than navigation:

   (1) Any person engaged in a commercial, industrial, scientific, educational,
   or local government activity

   (2) A corporation or association that will furnish radiolocation service to
   other persons.

   (3) A corporation that will furnish a nonprofit radio communication service
   to its parent corporation, to another subsidiary of the same parent, or to
   its own subsidiary where the party to be served is regularly engaged in any
   of the eligibility activities set forth in this paragraph.

   (b) Frequencies available. The following table indicates frequencies
   available for assignment to stations in the Radiolocation Service, together
   with the class of station(s) to which they are normally assigned, and the
   specific assignment limitations, which are explained in paragraph (c) of
   this section:

                  Radiolocation Service Frequency Table
------------------------------------------------------------------------
          Frequency or band             Class of station(s)   Limitation
------------------------------------------------------------------------
                                Kilohertz
------------------------------------------------------------------------
70 to 90............................  Radiolocation land or            1
                                       mobile.
90 to 110...........................  Radiolocation land....           2
110 to 130..........................  Radiolocation land or            1
                                       mobile.
1705 to 1715........................  ......do..............     4, 5, 6
1715 to 1750........................  ......do..............        5, 6
1750 to 1800........................  ......do..............     5, 6, 7
1900 to 1950........................  ......do..............  6, 25, 26,
                                                              27, and 30
1950 to 2000........................  ......do..............  6, 25, 27,
                                                                  and 30
3230 to 3400........................  ......do..............       6, 8
                                Megahertz
------------------------------------------------------------------------
  420 to 450........................  ......do..............          21
2450 to 2500........................  ......do..............   9, 22, 23
2900 to 3100........................  ......do..............      10, 11
3100 to 3300........................  ......do..............          12
3300 to 3500........................  ......do..............      12, 13
3500 to 3650........................  ......do..............          12
5250 to 5350........................  ......do..............          12
5350 to 5460........................  ......do..............      10, 14
5460 to 5470........................  ......do..............      10, 15
5470 to 5600........................  ......do..............      10, 11
5600 to 5650........................  ......do..............      10, 16
8500 to 9000........................  ......do..............      12, 17
9000 to 9200........................  ......do..............      10, 14
9200 to 9300........................  ......do..............          12
9300 to 9500........................  ......do..............  10, 15, 18
9500 to 10,000......................  ......do..............          12
10,000 to 10,500....................  ......do..............  12, 13, 19
10,500 to 10,550....................  ......do..............  20, 22, 24
13,400 to 13,750....................  ......do..............          12
13,750 to 14,000....................  ......do..............          31
15,700 to 17,700....................  ......do..............          12
24,050 to 24,250....................  ......do..............  12, 22, 24
33,400 to 36,000....................  ......do..............          12
------------------------------------------------------------------------

   (c) Explanation of assignment limitations appearing in the frequency table
   of paragraph (b) of this section:

   (1) This frequency band is shared with and stations operating in this
   frequency band in this service are on a secondary basis to stations licensed
   in the International Fixed Service and the Maritime Mobile Service.

   (2) This frequency band is shared with and stations operating in this
   frequency band in this service are on a secondary basis to the LORAN
   Navigation System; all operations are limited to radiolocation lands
   stations in accordance with footnote US104,  Sec. 2.106 of this chapter.

   (3) [Reserved]

   (4) The non-Federal Government radiolocation service in this band is on a
   secondary basis to stations in the aeronautical radionavigation service
   operating on 1708 kHz.

   (5) Station assignments on frequencies in this band will be made subject to
   the conditions that the maximum output power shall not exceed 375 watts and
   the maximum authorized bandwidth shall not exceed 2 kHz.

   (6) Because of the operation of stations having priority on the same or
   adjacent frequencies in this or in other countries, frequency assignments in
   this band may either be unavailable of may be subject to certain technical
   of operational limitations. Therefore, applications for frequency
   assignments in this band shall include information concerning the
   transmitter output power; the type and directional characteristics of the
   antenna and the minimum hours of operation (GMT).

   (7) This band is shared with the Disaster Communications Service (part 99)
   and operations are on a secondary basis to that service between local sunset
   and local sunrise, or at any time during an actual or imminent disaster.
   Local sunrise and sunset times shall be derived from the 1946 American
   Nautical Almanac. Each frequency assignment in this band is on an exclusive
   basis within the daytime primary service area to which assigned. The daytime
   primary service area is the area where the signal intensities are adequate
   for radiolocation purposes during the hours from sunrise to sunset from all
   stations in the radiolocation system of which the station in question is a
   part; that is, the primary service area of the station coincides with the
   primary service area of the system. The normal minimum geographical
   separation between stations of different licensees shall be at least 580 km.
   (360 mi.) when the stations are operated on the same frequency or on
   different frequencies separated by less than 3 kHz. Where geographical
   separation of less than 580 km. (360 mi.) is desired under these
   circumstances it must be shown that the desired separation will result in
   protection ratio of at least 20 decibels throughout the daytime primary
   service area of other stations. Applications in this band are placed on
   public notice in accordance with  Sec. 1.962 of this chapter. Where the number of
   applicants requesting authority to serve an area exceeds the number of
   frequencies available for assignment; or where it appears that fewer
   applicants or licensees than the number before it should be given authority
   to serve a particular area; or where it appears that an applicant, either
   directly or indirectly, seeks to use more than 25 kHz of the available
   spectrum space in this band, the applications may be designated for hearing.

   (8) Frequencies in this band may only be assigned to radiolocation stations
   which are also assigned frequencies in the 1605–1800 kHz band, provided the
   use of frequencies in this band is necessary for the proper functioning of
   the particular radiolocation system. Operations in this band are on a
   secondary basis to stations operating in accordance with the Commission's
   table of frequency allocations contained in  Sec. 2.106 of this chapter.

   (9) This band is allocated to the Radiolocation Service on a secondary basis
   to other fixed or mobile services and must accept any harmful interference
   that may be experienced from such services or from the industrial,
   scientific, and medical (ISM) equipment operating in accordance with part 18
   of this chapter. In the 2483.5–2500 MHz band, no applications for new or
   modification to existing stations to increase the number of transmitters
   will be accepted. Existing licensees as of July 25, 1985, or on a subsequent
   date following as a result of submitting an application for license on or
   before July 25, 1985, are grandfathered and their operation is co-primary
   with the Radiodetermination Satellite Service.

   (10) Speed measuring devices will not be authorized in this band.

   (11) This frequency band is shared with and is on a secondary basis to the
   Maritime Radionavigation Stations (part 80) and to the Government
   Radiolocation Service.

   (12) This frequency is shared with and is on a secondary basis to the
   Government Radiolocation Service.

   (13) Operations in this band are limited to survey operations using
   transmitters with a peak power not to exceed 5 watts into the antenna.

   (14) This frequency band is shared with and is on a secondary basis to the
   Aeronautical Radionavigation Service (part 87) and to the Government
   Radiolocation Service.

   (15) The non-Government Radiolocation Service in this band is secondary to
   the Maritime Radionavigation Stations (part 80), the Aeronautical
   Radionavigation Service (part 87) and the Government Radiolocation Service.

   (16) This frequency band is shared with and is on a secondary basis to the
   Maritime Radionavigation Stations (part 80) and the Government
   Meteorological Aids Service.

   (17) Operation in this frequency band is on a secondary basis to airborne
   Doppler radars at 8800 MHz.

   (18) Radiolocation installations will be coordinated with the Government
   Meteorological Aids Service, and insofar as practicable, will be adjusted to
   meet the needs of that service.

   (19) Operations in this band are on a secondary basis to the Amateur Radio
   Service (part 97). Pulsed emissions are prohibited.

   (20) This band is restricted to radiolocation systems using type N0N
   emission with a power not to exceed 40 watts into the antenna.

   (21) Non-Government radiolocation stations in the band are secondary to the
   Government Radiolocation Service, the Amateur Radio Service and the
   Amateur-Satellite Service. Pulse-ranging radiolocation stations in this band
   may be authorized along the shorelines of Alaska and the contiguous 48
   states. Radiolocation stations using spread spectrum techniques may be
   authorized in the band 420–435 MHz for operation within the contiguous 48
   states and Alaska. Also, stations using spread spectrum techniques shall be
   limited to a maximum output power of 50 watts, shall be subject to the
   applicable technical standards in  Sec. 90.209 until such time as more definitive
   standards are adopted by the Commission and shall identify in accordance
   with  Sec. 90.425(c)(3). Authorizations will be granted on a case-by-case basis;
   however, operations proposed to be located within the zones set forth in
    Sec. 90.177(e) should not expect to be accommodated.

   (22) For frequencies 2455 MHz, 10,525 MHz, and 24,125 MHz, only unmodulated,
   continuous wave (NON) emission shall be employed. The frequency 24.10 GHz,
   and frequencies in the 24.20–24.25 GHz band may use NON emission along with
   an ancillary FM digital emission. The frequency 24.10 GHz will be used for
   the purpose of alerting motorists of hazardous driving conditions and the
   presence of emergency vehicles. Equipment operating on 24.10 GHz must keep
   the deviation of the FM digital signal within  ±5 MHz. Equipment operating on
   this frequency must have a frequency stability of at least 2000 ppm and is
   exempt from the requirements of  Sec.  Sec. 90.403(c), 90.403(f), and 90.429 of this
   part.

   (23) Devices designed to operate as field disturbance sensors on frequencies
   between 2450 and 2500 MHz with a field strength equal to or less than 50,000
   microvolts per meter at 30 meters, on a fundamental frequency, will not be
   licensed or certificated for use under this part. Such equipment must comply
   with the requirements for field disturbance sensors as set forth in part 15
   of this chapter.

   (24) Devices designed to operate as field disturbance sensors on frequencies
   between 10,500 and 10,550 MHz and between 24,050 and 24,250 MHz, with field
   strength equal to or less than 250,000 microvolts per meter at 30 meters, on
   the fundamental frequency, will not be licensed or certificated for use
   under this part. Such equipment must comply with the requirements for field
   disturbance sensors as set forth in part 15 of this chapter.

   (25) Station assignments on frequencies in this band will be made subject to
   the conditions that the maximum output power shall not exceed 375 watts and
   the maximum authorized bandwidth shall not exceed 1.0 kHz.

   (26) Each frequency assignment in this band is on an exclusive basis within
   the primary service area to which assigned. The primary service area is the
   area where the signal intensities are adequate for radiolocation purposes
   from all stations in the radiolocation system of which the station in
   question is a part; that is, the primary service area of the station
   coincides with the primary service area of the system. The normal minimum
   geographical separation between stations of different licensees shall be at
   least 1931 km (1200 miles) when the stations are operated on the same
   frequency or on different frequencies separated by less than 1.0 kHz. Where
   geographical separation of less than 1931 km (1200 miles) is requested under
   these circumstances, it must be shown that the desired separation will
   result in a protection ratio of at least 20 decibels throughout the primary
   service area of other stations.

   (27) Notwithstanding the bandwidth limitations otherwise set forth in this
   section of the rules, wideband systems desiring to operate in this band may
   use such bandwidth as is necessary for proper operation of the system
   provided that the field strength does not exceed 120 microvolts per meter
   per square root Hertz (120 uv/m/Hz 1/2) at 1.6 km (1 mile). Such wideband
   operations shall be authorized on a secondary basis to stations operating
   within otherwise applicable technical standards. Applications for wideband
   systems in this band will be accepted beginning December 15, 1985.

   (28) Until July 1, 1988, this band will be available only for licensees of
   existing systems operating in the 1605–1705 kHz portion of the 1605–1715 kHz
   band requesting modification of their authorizations to change frequencies
   to this band and for licensees of wideband systems. On July 1, 1988,
   requests for new station authorizations in this band will be accepted and,
   if necessary, will be subject to the random selection procedures outlined in
    Sec. 1.972 of the Commission's Rules.

   (29) This frequency band is shared with and is on secondary basis to the
   Fixed-Satellite Service and to the Government's Radiolocation, Space
   Research and Earth Exploration-Satellite Services. After January 1, 2000,
   the Government's Space Research and Earth Exploration-Satellite Services
   shall operate on a co-equal secondary basis with the non-Government
   Radiolocation Service, except that grandfathered space stations in the
   Tracking and Data Relay Satellite System shall continue to be protected from
   harmful interference.

   (d) Other additional frequencies available. Radiolocation stations in this
   service may be authorized, on request, to use frequencies allocated
   exclusively to Federal Government stations, in those instances where the
   Commission finds, after consultation with the appropriate Government agency
   or agencies, that such assignment is necessary or required for coordination
   with Government activities.

   [ 43 FR 54791 , Nov. 22, 1978]

   Editorial Note:   For Federal Register citations affecting  Sec. 90.103, see the
   List of CFR Sections Affected, which appears in the Finding Aids section of
   the printed volume and on GPO Access.

Subpart G—Applications and Authorizations