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SpectrumWiki.com is an aggregate of information about the radio spectrum and its many uses. On a band-by-band basis, SpectrumWiki.com contains:

Allocations
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Additional information about the radio spectrum is contributed on a crowd-sourced basis through a wiki environment, including:

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and more. Please see below for more information about contributing to SpectrumWiki.

Latest Wiki Entries

Here are a few of the latest new and modified entries in SpectrumWiki:

Defense Satellite Communication System 3 (DSCS III)

According to the U.S. Space Force: Defense Satellite Communications System (DSCS) constellation provides long haul communications to users worldwide through contested environments. DSCS supports: the defense communications system, the military’s ground mobile forces, airborne terminals, ships at sea, and Department of Defense (DOD). The first DSCS III satellite was launched in October 1982. The final DSCS III satellite, B6, was launched in August 2003. In all, DSCS III successfully launched 14 satellites, six of which are still operational and continue to be used in various capacities, from operational communications in Southwest Asia to research and development of ground-based support capabilities. Space and Missile Systems Center (SMC), Los Angeles Air Force Base, Calif., sustains the DSCS Space Segment contract. DSCS III satellites support globally distributed DOD and national security users. Modifications made to these satellites will provide substantial capacity improvements through higher power amplifiers, more sensitive receivers, and additional antenna connectivity options. The DSCS communications payload includes six independent Super High Frequency (SHF) transponder channels. Three receive and five transmit antennas provide selectable options for Earth coverage, area coverage and/or spot beam coverage. A special purpose single-channel transponder is also on board. DSCS satellites provide the capabilities needed for effective implementation of worldwide military communications. It can adapt rapidly to dynamic operating conditions and perform under stressed environments. DSCS operates with large or small terminals. DSCS’s independent channels group users by operational needs or geographical location by allocating receiver sensitivity and transmitter power, thus providing maximum efficiency.

Paired Frequency Bands
Paired Bands	Use	Service	Table
7250 - 7750 MHz	DSCS III downlink	Mobile-satellite	F
7900 - 8400 MHz	DSCS III uplink	Mobile-satellite	F

Frequencies
Frequency	Bandwidth	Use	Service	Table
7600 MHz	-	DSCS III Beacon (A series satellites)	Mobile-satellite	F
7604.705882 MHz	-	DSCS III Beacon (B series satellites)	Mobile-satellite	F
8005.146484 MHz	-	DSCS III Channel 1 command uplink	Mobile-satellite	F
8370.146484 MHz	-	DSCS III Channel 5 command uplink	Mobile-satellite	F

External Links:

DSCS-3 (Gunter's Space Page)

DSCS-3 (fas.org)

DSCS III (Space Force)

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Possible new primary EESS allocation (WRC-15 Agenda Item 1.11)

ITU World Radiocommunication Conference 2015 Agenda Item 1.11: "To consider a primary allocation for the Earth exploration-satellite service (Earth-to-space) in the 7-8 GHz range, in accordance with Resolution 650 (WRC-12)"

Frequency Bands
Band	Use	Service	Table
7000 - 8000 MHz	Possible new primary EESS allocation (WRC-15 agenda item 1.11)	Earth Exploration-satellite (Earth-to-space)	-

External Links:

ITU-R Preparatory Studies for WRC-15

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Military Mobile-Satellite Communications (NTIA)

Satellites operating in the mobile-satellite service in this band are used by the military services and the Coast Guard. The military mobile-satellite communications networks in the band serve ships at sea, aircraft, land-based forces, and a variety of other U.S. military fixed and mobile terminals used by mobile users. The bands 225-322 MHz and 335.4- 399.9 MHz are the only bands below 7250 MHz available for Federal Government mobile-satellite communications, and the narrowband satellite links are frequently the only reliable means of communications. The military makes extensive use of the mobile-satellite service operating in this band because the electromagnetic waves can penetrate foliage, inclement weather, and urban terrain including concrete-reinforced buildings. Small antennas can be used at the earth terminals making it easy to transport the stations. There are numerous satellite earth terminals currently in use by the military, many of which are small and portable enough to be carried deep into theaters of operation. The Federal use of the band for mobile satellites was initiated in 1978 with the Navy's Fleet Satellite Communications System (FLTSATCOM), a constellation of five geostationary satellites operating in the band 235-322 MHz, channelized into the downlinks at 243.855-269.95 MHz and corresponding uplinks in the band 292.85- 317.325 MHz. The Navy began upgrading the FLTSATCOM in the 1990s with the UHF Follow-On (UFO) satellites. The UFO satellites offer increased communications channel capacity over the same frequency spectrum used by the previous FLTSATCOM systems. Each UFO satellite has 39 channels with a total 555 kHz bandwidth. The satellite payload comprises 21 narrowband channels at 5 kHz each and 17 relay channels at 25 kHz.3 These channels are used by the military agencies for tactical communications on land, ships, submarines, and aircraft. The Coast Guard also uses channels on the military satellites on some of their ships. The Department of Defense (DOD) Defense Satellite Communications System (DSCS-III) series of geostationary satellites operating in the 7- and 8- GHz bands also carry a transponder in this band called the single channel transponder (SCT) that provides communications for emergency action messages to the forces. The Military, Strategic, and Tactical Relay Satellite (MILSTAR) geostationary satellite also has mobile-satellite capability in this band, with a transponder that provides four Air Force Satellite Communications (AFSATCOM IIR) channels and a fleet broadcast channel. The Navy has launched the next generation mobile satellites, termed the Multiple User Objective System (MUOS) that use the bands 243.525-270.05 MHz and 280-320 MHz. The MUOS is undergoing testing and is not fully operational as of September, 2014. The Navy has awarded contracts for the MUOS, and overall, the MUOS will be $6.4 billion system. The MUOS enables communications to various terminal devices such as handhelds, laptops, and personal communications units. To support legacy systems, the MUOS will use a narrowband system of 64 kbps/channel and below. The MUOS will use wideband-code-division-multiple-access (WCDMA) technology, the same technology as some forms of the third generation (3G) commercial cellphone technology. The capacity is 4 Mbps per antenna beam. In general, the band 225-328.6 MHz is reserved for military uses by North Atlantic Treaty Organization (NATO), its member nations, and other U.S. allies. The band is harmonized among NATO-member nations for secure communications. (Information extracted from the NTIA Federal Government Spectrum Use Reports, dated December 1, 2015)

Frequency Bands
Band	Use	Service	Table
225 - 322 MHz	Military mobile-satellite communications	Mobile-satellite	F
335.4 - 399.9 MHz	Military mobile-satellite communications	Mobile-satellite	F

External Links:

FAS Space Policy Project, DSCS III Satellite Description (fas.org)

NTIA Spectrum Use Summary 225.0-328.6 MHz

UHF-MILSATCOM frequencies (RadioReference.com)

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Motus wildlife tracking systen

According to Motus.org, "the Motus Wildlife Tracking System (Motus) is an international collaborative research network that uses coordinated automated radio telemetry to facilitate research and education on the ecology and conservation of migratory animals. Motus is a program of Birds Canada in partnership with collaborating researchers and organizations." According to the Northeast Motus Collaboration, "nanotag transmitters currently weigh as little as 0.3g and all operate on 166.380 MHz, emitting a coded microburst pulse that allows each individual tag to be instantly identified." In Latin, the word motus means movement.

Frequencies
Frequency	Bandwidth	Use	Service	Table
166.38 MHz	-	Lotek Motus wildlife tags	Mobile	-
433 MHz	-	CTT LifeTag (sometimes used in Motus)	Mobile	-

External Links:

Motus wildlife tracking system

Northeast Motus Collaboration

LifeTag information

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Military Troposcatter Systems

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Please Contribute to SpectrumWiki!

SpectrumWiki data come from users like you, who contribute new information and expand or refine existing information. A small amount of data contributed by each of many users helps build a comprehensive knowledgebase of radio spectrum use.

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SpectrumWiki does not contain specific license data. Such information is already available through a variety of sources, including

nor does it provide extensive information about the systems that occupy the radio spectrum if such information is available elsewhere. What it does do is organize specific frequency-related information, and makes it easy, through a simple query, to figure out what each radio spectrum band is used for.

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