Allocations

 
U.S. Non-Federal-Government Allocations
4400 - 4500 MHz


U.S. Federal Government Allocations
4400 - 4940 MHz
FIXED
MOBILE


ITU Region 1 Allocations
4400 - 4500 MHz
FIXED
MOBILE 5.440A


ITU Region 2 Allocations
4400 - 4500 MHz
FIXED
MOBILE 5.440A


ITU Region 3 Allocations
4400 - 4500 MHz
FIXED
MOBILE 5.440A


SpectrumWiki


Footnotes

5.440A   In Region 2 (except Brazil, Cuba, French overseas departments and communities, Guatemala, Paraguay, Uruguay and Venezuela), and in Australia, the band 4 400-4 940 MHz may be used for aeronautical mobile telemetry for flight testing by aircraft stations (see No. 1.83). Such use shall be in accordance with Resolution 416 (WRC 07) and shall not cause harmful interference to, nor claim protection from, the fixed-satellite and fixed services. Any such use does not preclude the use of this band by other mobile service applications or by other services to which this band is allocated on a co-primary basis and does not establish priority in the Radio Regulations. (WRC-07)

US113   Radio astronomy observations of the formaldehyde line frequencies 4825-4835 MHz and 14.47-14.5 GHz may be made at certain radio astronomy observatories as indicated below:

Bands to be Observed
4 GHz14 GHzObservatory
XNational Astronomy and Ionosphere Center (NAIC), Arecibo, PR
XXNational Radio Astronomy Observatory (NRAO), Green Bank, WV
XXNRAO, Socorro, NM
XAllen Telescope Array (ATA), Hat Creek, CA
XXOwens Valley Radio Observatory (OVRO), Big Pine, CA
XXNRAO�s ten Very Long Baseline Array (VLBA) stations (see US131)
XXUniversity of Michigan Radio Astronomy Observatory, Stinchfield Woods, MI
XPisgah Astronomical Research Institute, Rosman, NC

    Every practicable effort will be made to avoid the assignment of frequencies to stations in the fixed or mobile services in these bands. Should such assignments result in harmful interference to these observations, the situation will be remedied to the extent practicable.

US245   In the bands 3600-3650 MHz (space-to-Earth), 4500-4800 MHz (space-to-Earth), and 5850-5925 MHz (Earth-to-space), the use of the non-Federal fixed-satellite service is limited to international inter-continental systems and is subject to case-by-case electromagnetic compatibility analysis. The FCC's policy for these bands is codified at 47 CFR 2.108.

US342   In making assignments to stations of other services to which the bands:

13 360-13 410 kHz42.77-42.87 GHz*
25 550-25 670 kHz43.07-43.17 GHz*
37.5-38.25 MHz43.37-43.47 GHz*
322-328.6 MHz*48.94-49.04 GHz*
1330-1400 MHz*76-86 GHz
1610.6-1613.8 MHz*92-94 GHz
1660-1660.5 MHz*94.1-100 GHz
1668.4-1670 MHz*102-109.5 GHz
3260-3267 MHz*111.8-114.25 GHz
3332-3339 MHz*128.33-128.59 GHz*
3345.8-3352.5 MHz*129.23-129.49 GHz*
4825-4835 MHz*130-134 GHz
4950-4990 MHz136-148.5 GHz
6650-6675.2 MHz*151.5-158.5 GHz
14.47-14.5 GHz*168.59-168.93 GHz*
22.01-22.21 GHz*171.11-171.45 GHz*
22.21-22.5 GHz172.31-172.65 GHz*
22.81-22.86 GHz*173.52-173.85 GHz*
23.07-23.12 GHz*195.75-196.15 GHz*
31.2-31.3 GHz209-226 GHz
36.43-36.5 GHz*241-250 GHz
42.5-43.5 GHz252-275 GHz

are allocated (*indicates radio astronomy use for spectral line observations), all practicable steps shall be taken to protect the radio astronomy service from harmful interference. Emissions from spaceborne or airborne stations can be particularly serious sources of interference to the radio astronomy service (see ITU Radio Regulations at Nos. 4.5 and 4.6 and Article 29).


SpectrumWiki

 
Aeronautical Radio Altimeters
4.9 GHz Public Safety Spectrum
Military Troposcatter Systems
802.11/WLAN/Wi-Fi/WiGig
IEEE 802.15.4 HRP UWB
Radio Astronomy Formaldehyde (H2CO) Observations
WRC-23 Agenda Item 1.1
WRC-27 study for potential IMT use
WRC-27 consideration of EESS (passive) allocations


Related Documents, Links, and Multimedia:
FCC Proceeding (2)

Engineering Data

Lower Frequency Center Frequency Upper Frequency
Frequency 4.4 GHz 4.67 GHz 4.94 GHz
Wavelength 6.8 cm 6.4 cm 6.1 cm
Band designator(s) SHF; C-band (IEEE) SHF; C-band (IEEE) SHF; C-band (IEEE)
Isotropic collecting area 3.7 cm2 3.3 cm2 2.9 cm2
Free space loss (1 m) 45.3 dB 45.8 dB 45.5 dB
Free space loss (1 km) 105.3 dB 105.8 dB 105.5 dB
Free space loss (10 km) 125.3 dB 125.8 dB 125.5 dB
Free space loss (100 km) 145.3 dB 145.8 dB 145.5 dB
Free space loss (1000 km) 165.3 dB 165.8 dB 165.5 dB
Free space loss
(35,786 km = GEO orbit)
196.4 dB 196.9 dB 196.6 dB
Free space loss (378,370 km = Moon) 216.9 dB 217.4 dB 217.1 dB
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