Allocations

 
U.S. Non-Federal-Government Allocations
4200 - 4400 MHz
AERONAUTICAL RADIONAVIGATION

FCC Rule Parts:
Aviation (87)

U.S. Federal Government Allocations
4200 - 4400 MHz
AERONAUTICAL RADIONAVIGATION


ITU Region 1 Allocations
4200 - 4400 MHz
AERONAUTICAL RADIONAVIGATION 5.438


ITU Region 2 Allocations
4200 - 4400 MHz
AERONAUTICAL RADIONAVIGATION 5.438


ITU Region 3 Allocations
4200 - 4400 MHz
AERONAUTICAL RADIONAVIGATION 5.438


SpectrumWiki


Footnotes


5.438 Use of the band 4200-4400 MHz by the aeronautical radionavigation service is reserved exclusively for radio altimeters installed on board aircraft and for the associated transponders on the ground. However, passive sensing in the Earth exploration-satellite and space research services may be authorized in this band on a secondary basis (no protection is provided by the radio altimeters).

5.439 Additional allocation: in Iran (Islamic Republic of), the band 4200-4400 MHz is also allocated to the fixed service on a secondary basis. (WRC-12)

5.440 The standard frequency and time signal-satellite service may be authorized to use the frequency 4202 MHz for space-to-Earth transmissions and the frequency 6427 MHz for Earth-to-space transmissions. Such transmissions shall be confined within the limits of ± 2 MHz of these frequencies, subject to agreement obtained under No. 9.21.

US261 The use of the band 4200-4400 MHz by the aeronautical radionavigation service is reserved exclusively for airborne radio altimeters. Experimental stations will not be authorized to develop equipment for operational use in this band other than equipment related to altimeter stations. However, passive sensing in the Earth-exploration satellite and space research services may be authorized in this band on a secondary basis (no protection is provided from the radio altimeters).

SpectrumWiki

 
Aeronautical Radio Altimeters
4 GHz Fixed Service Band
Geostationary Fixed Satellite Service (GSO FSS)
Common Carrier Fixed Point-to-Point Microwave
Actions to support FSS Earth stations in 3400-4200 MHz (WRC-15 Agenda Item 9.1.5)


Related Documents, Links, and Multimedia:
FCC Proceeding (1)

Engineering Data

Lower Frequency Center Frequency Upper Frequency
Frequency 4.2 GHz 4.3 GHz 4.4 GHz
Wavelength 7.1 cm 7.0 cm 6.8 cm
Band designator(s) SHF; C-band (IEEE) SHF; C-band (IEEE) SHF; C-band (IEEE)
Isotropic collecting area 4.1 cm2 3.9 cm2 3.7 cm2
Free space loss (1 m) 44.9 dB 45.1 dB 45.3 dB
Free space loss (1 km) 104.9 dB 105.1 dB 105.3 dB
Free space loss (10 km) 124.9 dB 125.1 dB 125.3 dB
Free space loss (100 km) 144.9 dB 145.1 dB 145.3 dB
Free space loss (1000 km) 164.9 dB 165.1 dB 165.3 dB
Free space loss
(35,786 km = GEO orbit)
196.0 dB 196.2 dB 196.4 dB
Free space loss (378,370 km = Moon) 216.5 dB 216.7 dB 216.9 dB