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Engineering data
Allocations
Intro to Allocations
U.S. Non-Federal-Government Allocations
137.825
-
138
MHz
5.208
FCC Rule Parts:
Satellite Communications (25)
U.S. Federal Government Allocations
137.825
-
138
MHz
FIXED
MOBILE
5.208
ITU Region 1 Allocations
137.825
-
138
MHz
AERONAUTICAL MOBILE (OR)
5.204
5.205
5.206
5.207
5.208
ITU Region 2 Allocations
137.825
-
138
MHz
FIXED
MOBILE
RADIOLOCATION
Space research (space-to-Earth)
5.204
5.205
5.206
5.207
5.208
ITU Region 3 Allocations
137.825
-
138
MHz
FIXED
MOBILE
Space research (space-to-Earth)
5.204
5.205
5.206
5.207
5.208
SpectrumWiki
Orbcomm LEO Satellite Constellation
More...
Footnotes
5.204
Different category of service:
in Afghanistan, Saudi Arabia, Bahrain, Bangladesh, Brunei Darussalam, China, Cuba, the United Arab Emirates, India, Indonesia, Iran (Islamic Republic of), Iraq, Kuwait, Montenegro, Oman, Pakistan, the Philippines, Qatar, Serbia, Singapore, Thailand and Yemen, the band 137-138 MHz is allocated to the fixed and mobile, except aeronautical mobile (R), services on a primary basis (see No. 5.33). (WRC-07)
5.205
Different category of service:
in Israel and Jordan, the allocation of the band 137-138 MHz to the fixed and mobile, except aeronautical mobile, services is on a primary basis (see No. 5.33).
5.206
Different category of service:
in Armenia, Azerbaijan, Belarus, Bulgaria, Egypt, the Russian Federation, Finland, France, Georgia, Greece, Kazakhstan, Lebanon, Moldova, Mongolia, Uzbekistan, Poland, Kyrgyzstan, the Syrian Arab Republic, Slovakia, the Czech Rep., Romania, Tajikistan, Turkmenistan and Ukraine, the allocation of the band 137-138 MHz to the aeronautical mobile (OR) service is on a primary basis (see No. 5.33).
5.207
Additional allocation:
in Australia, the band 137-144 MHz is also allocated to the broadcasting service on a primary basis until that service can be accommodated within regional broadcasting allocations.
5.208
The use of the band 137-138 MHz by the mobile-satellite service is subject to coordination under No. 9.11A.
SpectrumWiki
Orbcomm LEO Satellite Constellation
Orbcomm is a constellation of 31 low-Earth orbit (LEO) satellites that provide messaging and machine-to-machine communications, among other functions, in the VHF band.
Please see the references for additional business and technical information regarding the Orbcomm system.
Frequency Bands
Band
Use
Service
Table
137
-
138
MHz
Orbcomm downlink
Mobile-satellite
N
148
-
150.05
MHz
Orbcomm uplink
Mobile-satellite
N
External Links:
Architecture of ORBCOMM Little LEO Global Satellite System for Mobile and Personal Communications (Microwave Journal)
Orbcomm (Wikipedia)
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Occupancy Measurements (10)
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Frequencies/Bands
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Shared Spectrum Company Spectrum Occupancy Measurements: Loring Commerce Centre, Limestone, Maine, September 18-20, 2007
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Shared Spectrum Company Spectrum Occupancy Measurements: Dublin, Ireland, April 16-18, 2007
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30
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3000
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Document date or date of hyperlink query:
March 30, 2012
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Shared Spectrum Company Spectrum Occupancy Measurements: Chicago, Illinois, November 16-18, 2005
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30
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Shared Spectrum Company Spectrum Occupancy Measurements: Riverbend Park, Great Falls, Virginia, April 7, 2004
Frequencies/Bands
30
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3000
MHz
Document type and status:
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Document date or date of hyperlink query:
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Shared Spectrum Company Spectrum Occupancy Measurements: Riverbend Park, Great Falls, Virginia, April 7, 2004
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Shared Spectrum Company Spectrum Occupancy Measurements: Tyson’s Square Center, Vienna, Virginia, April 9, 2004
Frequencies/Bands
30
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3000
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Document date or date of hyperlink query:
March 30, 2012
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Shared Spectrum Company Spectrum Occupancy Measurements: National Science Foundation Building Roof, April 16, 2004
Frequencies/Bands
30
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3000
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Document type and status:
Occupancy measurements (Current)
Document date or date of hyperlink query:
March 30, 2012
Shared Spectrum Company Spectrum Occupancy Measurements: National Science Foundation Building Roof, April 16, 2004
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Shared Spectrum Company Spectrum Occupancy Measurements: Republican National Convention, New York City, New York, August 30 – September 3, 2004
Frequencies/Bands
30
-
3000
MHz
Document type and status:
Occupancy measurements (Current)
Document date or date of hyperlink query:
March 30, 2012
Shared Spectrum Company Spectrum Occupancy Measurements: Republican National Convention, New York City, New York, August 30 – September 3, 2004
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Shared Spectrum Company Spectrum Occupancy Measurements: National Radio Astronomy Observatory (NRAO), October 10-11, 2004
Frequencies/Bands
30
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3000
MHz
Document type and status:
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Document date or date of hyperlink query:
March 30, 2012
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Shared Spectrum Company Spectrum Occupancy Measurements: Shared Spectrum Building Roof, Vienna, Virginia, December 15-16, 2004
Frequencies/Bands
30
-
3000
MHz
Document type and status:
Occupancy measurements (Current)
Document date or date of hyperlink query:
March 30, 2012
Shared Spectrum Company Spectrum Occupancy Measurements: Shared Spectrum Building Roof, Vienna, Virginia, December 15-16, 2004
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Engineering Data
Lower Frequency
Center Frequency
Upper Frequency
Frequency
137.825 MHz
137.9125 MHz
138 MHz
Wavelength
2.2 m
2.2 m
2.2 m
Band designator(s)
VHF
VHF
VHF
Isotropic collecting area
3,765.1 cm
2
3,760.3 cm
2
3,755.5 cm
2
Free space loss (1 m)
15.2 dB
15.2 dB
15.2 dB
Free space loss (1 km)
75.2 dB
75.2 dB
75.2 dB
Free space loss (10 km)
95.2 dB
95.2 dB
95.2 dB
Free space loss (100 km)
115.2 dB
115.2 dB
115.2 dB
Free space loss (1000 km)
135.2 dB
135.2 dB
135.2 dB
Free space loss
(35,786 km = GEO orbit)
166.3 dB
166.3 dB
166.3 dB
Free space loss (378,370 km = Moon)
186.8 dB
186.8 dB
186.8 dB