U.S. Non-Federal-Government Allocations
FIXED
LAND MOBILE
FCC rule parts
SpectrumWiki
Radio spectrum allocations
Look up a frequency or a range.
Examples: 88.5 MHz, 1350–1430 MHz, 2.4 GHz
221.999999 MHz (221,999,999 Hz)
U.S. Federal Government Allocations
FIXED
LAND MOBILE
ITU Region 1 Allocations
BROADCASTING
ITU Region 2 Allocations
AMATEUR
FIXED
MOBILE
Radiolocation 5.241
ITU Region 3 Allocations
FIXED
MOBILE
BROADCASTING
Footnotes
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5.233 Additional allocation: in China, the band 174-184 MHz is also allocated to the space research (space-to-Earth) and the space operation (space-to-Earth) services on a primary basis, subject to agreement obtained under No. 9.21. These services shall not cause harmful interference to, or claim protection from, existing or planned broadcasting stations.
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5.235 Additional allocation: in Germany, Austria, Belgium, Denmark, Spain, Finland, France, Israel, Italy, Liechtenstein, Malta, Monaco, Norway, the Netherlands, the United Kingdom, Sweden and Switzerland, the band 174 223 MHz is also allocated to the land mobile service on a primary basis. However, the stations of the land mobile service shall not cause harmful interference to, or claim protection from, broadcasting stations, existing or planned, in countries other than those listed in this footnote.
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5.237 Additional allocation: in Congo (Rep. of the), Egypt, Eritrea, Ethiopia, Gambia, Guinea, Libya, Mali, Sierra Leone, Somalia and Chad, the band 174-223 MHz is also allocated to the fixed and mobile services on a secondary basis. (WRC 12)
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5.238 Additional allocation: in Bangladesh, India, Pakistan and the Philippines, the band 200-216 MHz is also allocated to the aeronautical radionavigation service on a primary basis.
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5.240 Additional allocation: in China and India, the band 216-223 MHz is also allocated to the aeronautical radionavigation service on a primary basis and to the radiolocation service on a secondary basis.
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5.241 In Region 2, no new stations in the radiolocation service may be authorized in the band 216-225 MHz. Stations authorized prior to 1 January 1990 may continue to operate on a secondary basis.
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5.243 Additional allocation: in Somalia, the band 216-225 MHz is also allocated to the aeronautical radionavigation service on a primary basis, subject to not causing harmful interference to existing or planned broadcasting services in other countries.
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5.245 Additional allocation: in Japan, the band 222-223 MHz is also allocated to the aeronautical radionavigation service on a primary basis and to the radiolocation service on a secondary basis.
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US241 The following provision shall apply to Federal operations in the band 216-220.035 MHz:
(a) Use of the fixed and land mobile services in the band 216-220 MHz and of the aeronautical mobile service in the sub-band 217-220 MHz is restricted to telemetry and associated telecommand operations. New stations in the fixed and land mobile services shall not be authorized in the sub-band 216-217 MHz.
(b) The sub-band 216.965-216.995 MHz is also allocated to the Federal radiolocation service on a primary basis and the use of this allocation is restricted to the Air Force Space Surveillance System (AFSSS) radar system. AFSSS stations transmit on the frequency 216.98 MHz and other operations may be affected within: 1) 250 km of Lake Kickapoo (Archer City), TX (33° 2' 48'' N, 98° 45' 46'' W); and 2) 150 km of Gila River (Phoenix), AZ (33° 6' 32'' N, 112° 1' 45'' W) and Jordan Lake (Wetumpka), AL (32° 39' 33'' N, 86° 15' 52'' W). AFSSS reception shall be protected from harmful interference within 50 km of: 1) Elephant Butte, NM (33° 26' 35'' N, 106° 59' 50'' W); 2) Fort Stewart, GA (31° 58' 36'' N, 81° 30' 34'' W); 3) Hawkinsville, GA (32° 17' 20'' N, 83° 32' 10'' W); 4) Red River, AR (33° 19' 48'' N, 93° 33' 1'' W); 5) San Diego, CA (32° 34' 42'' N, 116° 58' 11'' W); and 6) Silver Lake, MS (33° 8' 42'' N, 91° 1' 16'' W).
(c) The sub-band 219.965-220.035 MHz is also allocated to the Federal radiolocation service on a secondary basis and the use of this allocation is restricted to air-search radars onboard Coast Guard vessels.
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US242 Use of the fixed and land mobile services in the band 220-222 MHz shall be in accordance with the following plan:
(a) Frequencies are assigned in pairs, with base station transmit frequencies taken from the sub-band 220-221 MHz and with corresponding mobile and control station transmit frequencies being 1 MHz higher and taken from the sub-band 221-222 MHz.
(b) In the non-Federal exclusive sub-bands, temporary fixed geophysical telemetry operations are also permitted on a secondary basis.
(c) The use of Channels 161-170 is restricted to public safety/mutual aid communications.
(d) The use of Channels 181-185 is restricted to emergency medical communications.
220 MHz Plan Use Base Transmit Mobile Transmit Channels Nos. Non-Federal exclusive 220.00-220.55 221.00-221.55 001-110 Federal exclusive 220.55-220.60 221.55-221.60 111-120 Non-Federal exclusive 220.60-220.80 221.60-221.80 121-160 Shared 220.80-220.85 221.80-221.85 161-170 Non-Federal exclusive 220.85-220.90 221.85-221.90 171-180 Shared 220.90-220.925 221.90-221.925 181-185 Non-Federal exclusive 220.925-221 221.925-222 186-200
Wiki entries
Positive Train Control
Current Use
217–222 MHz Positive Train Control (PTC)
According to the Federal Railroad Administration:
"In 2008, Congress required Class I Railroad mainlines handling poisonous-inhalation-hazard materials and any railroad main lines with regularly scheduled intercity and commuter rail passenger service to fully implement Positive Train Control by December 31, 2015. PTC uses communication-based/processor-based train control technology that provides a system capable of reliably and functionally preventing train-to-train collisions, overspeed derailments, incursions into established work zone limits, and the movement of a train through a main line switch in the wrong position.
"In late 2015, Congress extended the deadline by at least three years to December 31, 2018, with the possibility for two additional years if certain requirements are met. The new legislation, the PTC Enforcement and Implementation Act, required that railroads submit a revised PTC Implementation Plan (PTCIP) by January 26, 2016, outlining when and how the railroad would have a system fully installed and activated."
There are no formally-adopted standard frequency bands or designated frequencies for PTC, although frequencies in the ~220 MHz range are becoming the de facto standard. PTC may make use of channels belonging to various services spanning the 217-222 MHz range, including frequencies allotted for the 218-219 MHz Service (formerly the Interactive Video and Data Service (IVDS)) and the Automated Maritime Telecommunications System (AMTS). In fact, the challenge of obtaining sufficient spectrum is one of the reasons cited for delayed implementation of PTC.
"In 2008, Congress required Class I Railroad mainlines handling poisonous-inhalation-hazard materials and any railroad main lines with regularly scheduled intercity and commuter rail passenger service to fully implement Positive Train Control by December 31, 2015. PTC uses communication-based/processor-based train control technology that provides a system capable of reliably and functionally preventing train-to-train collisions, overspeed derailments, incursions into established work zone limits, and the movement of a train through a main line switch in the wrong position.
"In late 2015, Congress extended the deadline by at least three years to December 31, 2018, with the possibility for two additional years if certain requirements are met. The new legislation, the PTC Enforcement and Implementation Act, required that railroads submit a revised PTC Implementation Plan (PTCIP) by January 26, 2016, outlining when and how the railroad would have a system fully installed and activated."
There are no formally-adopted standard frequency bands or designated frequencies for PTC, although frequencies in the ~220 MHz range are becoming the de facto standard. PTC may make use of channels belonging to various services spanning the 217-222 MHz range, including frequencies allotted for the 218-219 MHz Service (formerly the Interactive Video and Data Service (IVDS)) and the Automated Maritime Telecommunications System (AMTS). In fact, the challenge of obtaining sufficient spectrum is one of the reasons cited for delayed implementation of PTC.