Allocations

 
U.S. Non-Federal-Government Allocations
235 - 238 GHz
EARTH EXPLORATION-SATELLITE (passive)
FIXED-SATELLITE (space-to-Earth)
SPACE RESEARCH (passive)


U.S. Federal Government Allocations
235 - 238 GHz
EARTH EXPLORATION-SATELLITE (passive)
FIXED-SATELLITE (space-to-Earth)
SPACE RESEARCH (passive)


ITU Region 1 Allocations
235 - 238 GHz
EARTH EXPLORATION-SATELLITE (passive)
FIXED-SATELLITE (space-to-Earth)
SPACE RESEARCH (passive)


ITU Region 2 Allocations
235 - 238 GHz
EARTH EXPLORATION-SATELLITE (passive)
FIXED-SATELLITE (space-to-Earth)
SPACE RESEARCH (passive)


ITU Region 3 Allocations
235 - 238 GHz
EARTH EXPLORATION-SATELLITE (passive)
FIXED-SATELLITE (space-to-Earth)
SPACE RESEARCH (passive)


SpectrumWiki

Band Uses (235 - 238 GHz)

Footnotes

5.563A   In the bands 200-209 GHz, 235-238 GHz, 250-252 GHz and 265-275 GHz, ground-based passive atmospheric sensing is carried out to monitor atmospheric constituents. (WRC 2000)

5.563B   The band 237.9-238 GHz is also allocated to the Earth exploration-satellite service (active) and the space research service (active) for spaceborne cloud radars only. (WRC 2000)


SpectrumWiki

 
WRC-23 Agenda Item 1.14 Possible Adjustments to EESS (passive) Allocations
DARPA Video Synthetic Aperture Radar (ViSAR)
WRC-27 study for radiolocation use


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

Engineering Data

Lower Frequency Center Frequency Upper Frequency
Frequency 235 GHz 236.5 GHz 238 GHz
Wavelength 1.3 mm 1.3 mm 1.3 mm
Band designator(s) EHF (millimeter wave) EHF (millimeter wave) EHF (millimeter wave)
Isotropic collecting area 0.1 mm2 0.1 mm2 0.1 mm2
Free space loss (1 m) 79.9 dB 79.9 dB 80.0 dB
Free space loss (1 km) 139.9 dB 139.9 dB 140.0 dB
Free space loss (10 km) 159.9 dB 159.9 dB 160.0 dB
Free space loss (100 km) 179.9 dB 179.9 dB 180.0 dB
Free space loss (1000 km) 199.9 dB 199.9 dB 200.0 dB
Free space loss
(35,786 km = GEO orbit)
230.9 dB 231.0 dB 231.1 dB
Free space loss (378,370 km = Moon) 251.4 dB 251.5 dB 251.5 dB
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