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In U.S. and Canadian aviation, MULTICOM is a frequency allocation used as a Common Traffic Advisory Frequency (CTAF) by aircraft near airports where no air traffic control is available. Frequency allocations vary from region to region.
Despite the use of uppercase letters, MULTICOM is not an abbreviation or acronym.
In the United States, there is one MULTICOM frequency: 122.9 MHz. (See AIM table 4-1-2 or AIM table 4-1-1) At uncontrolled airports without a UNICOM, pilots are to self-announce on the MULTICOM frequency.
In Australia, there is one MULTICOM frequency: 126.7 MHz.
In Brazil, there is one MULTICOM frequency: 123.45 MHz.
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Frequency allocation is the allocation and regulation of the electromagnetic spectrum into radio frequency bands, which is normally done by governments in most countries. Because radio propagation does not stop at national boundaries, governments have sought to harmonise the allocation of RF bands and their standardization.
The FM broadcast band, used for FM broadcast radio by radio stations, differs between different parts of the world. In Europe and Africa ( ) and in Australia, it spans from 87.5 to 108 megahertz (MHz) - also known as VHF Band II - while in the Americas it ranges from 88 to 108 MHz. The FM broadcast band in Japan uses 76 to 95 MHz. The International Radio and Television Organisation (OIRT) band in Eastern Europe is from 65.8 to 74.0 MHz, although these countries now primarily use the 87.5 to 108 MHz band, as in the case of Russia. Some other countries have already discontinued the OIRT band and have changed to the 87.5 to 108 MHz band.
The 1.25 meter, 220 MHz or 222 MHz band is a portion of the VHF radio spectrum internationally allocated for amateur radio use on a primary basis in ITU Region 2, and it comprises frequencies from 220 MHz to 225 MHz. In the United States and Canada, the band is available on a primary basis from 222 to 225 MHz, with the addition of 219 to 220 MHz on a limited, secondary basis. It is not available for use in ITU Region 1 or ITU Region 3. The license privileges of amateur radio operators include the use of frequencies within this band, which is primarily used for local communications.
Common traffic advisory frequency (CTAF) is the name given to the VHF radio frequency used for air-to-air communication at United States, Canadian and Australian non-towered airports.
Watsonville Municipal Airport is three miles (5 km) northwest of Watsonville, in Santa Cruz County, California. The airport covers 330 acres (134 ha) and has two runways. The largest aircraft to ever land at Watsonville were 05-5141 and 05-5143, C-17 Globemaster IIIs from March ARB, CA.
The 60-meter band or 5 MHz band is a relatively new amateur radio allocation, first introduced in 2002, that was originally only available in a few countries, such as the United States, United Kingdom, Norway, Finland, Denmark, Ireland and Iceland. Over a number of years however, an increasing proportion of countries' telecommunications administrations – together with their government and military users – have permitted Amateur Radio operation in the 5 MHz area on a short or longer term basis, ranging from discrete channels to a frequency band allocation.
Chippewa County International Airport is a public use airport in Chippewa County, Michigan, United States. It is located 15 nautical miles south of the central business district of Sault Ste. Marie, Michigan. The airport is owned by the Chippewa County Economic Development Corporation. It was formerly the Kincheloe Air Force Base.
A UNICOM station is an air-ground communication facility operated by a non-air traffic control private agency to provide advisory service at uncontrolled aerodromes and airports and to provide various non-flight services, such as requesting a taxi, even at towered airports. It is also known as an aeronautical advisory station. The equivalent European/ICAO service is known as (aerodrome) flight information service, abbreviated as AFIS or FIS.
Amateur radio frequency allocation is done by national telecommunication authorities. Globally, the International Telecommunication Union (ITU) oversees how much radio spectrum is set aside for amateur radio transmissions. Individual amateur stations are free to use any frequency within authorized frequency ranges; authorized bands may vary by the class of the station license.
West Bend Municipal Airport is a city-owned public-use airport located three nautical miles (6 km) east of the central business district of West Bend, a city in Washington County, Wisconsin, United States. It is included in the Federal Aviation Administration (FAA) National Plan of Integrated Airport Systems for 2019–2023, in which it is categorized as a regional reliever airport facility.
Allegan City Airport is a general aviation airport located 1 mile (2 km) east of Allegan in Allegan County, Michigan, USA.
The 23 centimeter, 1200 MHz or 1.2 GHz band is a portion of the UHF (microwave) radio spectrum internationally allocated to amateur radio and amateur satellite use on a secondary basis. The amateur radio band is between 1240 MHz and 1300 MHz. The amateur satellite band is between 1260 MHz and 1270 MHz, and its use by satellite operations is only for up-links on a non-interference basis to other radio users. The allocations are the same in all three ITU regions.
The World Administrative Radio Conference (WARC) bands are three portions of the shortwave radio spectrum used by licensed and/or certified amateur radio operators. They consist of 30 meters (10.100–10.150 MHz), 17 meters (18.068–18.168 MHz) and 12 meters (24.890–24.990 MHz). They were named after the World Administrative Radio Conference, which in 1979 created a worldwide allocation of these bands for amateur use. The bands were opened for use in the early 1980s. Due to their relatively small bandwidth of 100 kHz or less, there is a gentlemen's agreement that the WARC bands may not be used for general contesting. This agreement has been codified in official recommendations, such as the IARU Region 1 HF Manager's Handbook, which states: "Contest activity shall not take place on the 10, 18, and 24 MHz bands."
The National Airspace System (NAS) is the airspace, navigation facilities and airports of the United States along with their associated information, services, rules, regulations, policies, procedures, personnel and equipment. It includes components shared jointly with the military. It is one of the most complex aviation systems in the world, and services air travel in the United States and over large portions of the world's oceans.
Craig Field is a public airport four miles southeast of Selma, in Dallas County, Alabama. The FAA's National Plan of Integrated Airport Systems for 2011–2015 categorized it as a general aviation facility. It was previously the U.S. Air Force Craig Air Force Base, closed in 1977.
The 13 centimeter, 2.3 GHz or 2.4 GHz band is a portion of the UHF (microwave) radio spectrum internationally allocated to amateur radio and amateur satellite use on a secondary basis. The amateur radio band is between 2300 MHz and 2450 MHz. The amateur satellite band is between 2400 MHz and 2450 MHz, and its use by satellite operations is on a non-interference basis to other radio users. The license privileges of amateur radio operators include the use of frequencies and a wide variety of modes within these ranges for telecommunication. The allocations are the same in all three ITU Regions.
Hammond Northshore Regional Airport is a city-owned, public-use, joint civil-military, general aviation airport located three nautical miles (6 km) northeast of the central business district of Hammond, a city in Tangipahoa Parish, Louisiana, United States. The airport was previously an uncontrolled facility utilizing VHF-band UNICOM as a Common Traffic Advisory Frequency (CTAF). As a result of the relocation of Army National Guard flight operations from Lakefront Airport to Hammond, a new control tower was constructed at the airport. This tower, manned by military air traffic controllers from the Air Operations Department of the Louisiana Army National Guard's Army Aviation Support Facility #1 at the airport, became operational on 15 December 2014.
Blue Canyon–Nyack Airport is an airport in Emigrant Gap, Placer County, California.
Markham Airport or Toronto/Markham Airport,, is a private aerodrome operating 2.6 nautical miles north of Markham, Ontario, Canada near Toronto.
The 9-centimeter band is a portion of the SHF (microwave) radio spectrum internationally allocated to amateur radio and amateur satellite use. The amateur radio band, in ITU regions 1 and 2, is between 3,300 MHz and 3,500 MHz, and it is available only on a secondary basis. The amateur satellite band is between 3,400 MHz and 3,410 MHz, and it is only available in ITU Regions 1 and 2, on a non-interference basis to other users. In Germany and Israel, the band 3,400 - 3,475 MHz is also allocated to the amateur service on a secondary basis.