Allocations

 
U.S. Non-Federal-Government Allocations
2900 - 3100 MHz
MARITIME RADIONAVIGATION
Radiolocation US44


U.S. Federal Government Allocations
2900 - 3100 MHz
RADIOLOCATION 5.424A G56
MARITIME RADIONAVIGATION


ITU Region 1 Allocations
2900 - 3100 MHz
RADIOLOCATION 5.424A
RADIONAVIGATION 5.426


ITU Region 2 Allocations
2900 - 3100 MHz
RADIOLOCATION 5.424A
RADIONAVIGATION 5.426


ITU Region 3 Allocations
2900 - 3100 MHz
RADIOLOCATION 5.424A
RADIONAVIGATION 5.426


SpectrumWiki


Footnotes


5.424A In the band 2900-3100 MHz, stations in the radiolocation service shall not cause harmful interference to, nor claim protection from, radar systems in the radionavigation service.

5.425 In the band 2900-3100 MHz, the use of the shipborne interrogator-transponder (SIT) system shall be confined to the sub-band 2930-2950 MHz.

5.426 The use of the band 2900-3100 MHz by the aeronautical radionavigation service is limited to ground-based radars.

5.427 In the bands 2900-3100 MHz and 9300-9500 MHz, the response from radar transponders shall not be capable of being confused with the response from radar beacons (racons) and shall not cause interference to ship or aeronautical radars in the radionavigation service, having regard, however, to No. 4.9.

US316 The band 2900-3000 MHz is also allocated to the meteorological aids service on a primary basis for Federal use. Operations in this service are limited to Next Generation Weather Radar (NEXRAD) systems where accommodation in the band 2700-2900 MHz is not technically practical and are subject to coordination with existing authorized stations.

US44 In the band 2900-3100 MHz, the non-Federal radiolocation service may be authorized on the condition that no harmful interference is caused to Federal services.

G56 Federal radiolocation in the bands 1215-1300, 2900-3100, 5350-5650 and 9300-9500 MHz is primarily for the military services; however, limited secondary use is permitted by other Federal agencies in support of experimentation and research programs. In addition, limited secondary use is permitted for survey operations in the band 2900-3100 MHz.

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SPY-1 Shipborne Air Surveillance Radar
NEXRAD Weather Radar
Through-wall Radar waiver


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Occupancy Measurements (10)

Engineering Data

Lower Frequency Center Frequency Upper Frequency
Frequency 2900 MHz 3 GHz 3.1 GHz
Wavelength 10.3 cm 10.0 cm 9.7 cm
Band designator(s) UHF; S-band (IEEE) SHF; S-band (IEEE) SHF; S-band (IEEE)
Isotropic collecting area 8.5 cm2 7.9 cm2 7.4 cm2
Free space loss (1 m) 41.7 dB 42.0 dB 42.3 dB
Free space loss (1 km) 101.7 dB 102.0 dB 102.3 dB
Free space loss (10 km) 121.7 dB 122.0 dB 122.3 dB
Free space loss (100 km) 141.7 dB 142.0 dB 142.3 dB
Free space loss (1000 km) 161.7 dB 162.0 dB 162.3 dB
Free space loss
(35,786 km = GEO orbit)
192.8 dB 193.1 dB 193.4 dB
Free space loss (378,370 km = Moon) 213.3 dB 213.6 dB 213.8 dB