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Amateur radio
An example of an amateur radio station with four transceivers, amplifiers, and a computer for logging and for digital modes. On the wall are examples of various amateur radio awards, certificates, and a reception report card (QSL card) from a foreign amateur station.

Amateur radio, also known as ham radio, includes the use of radio frequencyspectrum for purposes of non-commercial exchange of messages, wireless experimentation, self-training, private recreation, radiosport, contesting, and emergency communication. The term 'amateur' is used to specify 'a duly authorised person interested in radioelectric practice with a purely personal aim and without pecuniary interest;'[1] (either direct monetary or other similar reward) and to differentiate it from commercial broadcasting, public safety (such as police and fire), or professional two-way radio services (such as maritime, aviation, taxis, etc.).

The amateur radio service (amateur service and amateur-satellite service) is established by the International Telecommunication Union (ITU) through the Radio Regulations. National governments regulate technical and operational characteristics of transmissions and issue individual stations licenses with an identifying call sign. Prospective amateur operators are tested for their understanding of key concepts in electronics and the host government's radio regulations.

Radio amateurs use a variety of voice, text, image, and data communications modes and have access to frequency allocations throughout the RF spectrum. This enables communication across a city, region, country, continent, the world, or even into space. In many countries, amateur radio operators may also send, receive, or relay radio communications between computers or transceivers connected to secure virtual private networks on the Internet.


Amateur radio is officially represented and coordinated by the International Amateur Radio Union (IARU), which is organized in three regions and has as its members the national amateur radio societies which exist in most countries.According to an estimate made in 2011 by the American Radio Relay League, two million people throughout the world are regularly involved with amateur radio.[2] About 830,000 amateur radio stations are located in IARU Region 2 (the Americas) followed by IARU Region 3 (South and East Asia and the Pacific Ocean) with about 750,000 stations. A significantly smaller number, about 400,000, are located in IARU Region 1 (Europe, Middle East, CIS, Africa).

  • 1History
  • 3Licensing
  • 4Modes of communication


An amateur radio station in the United Kingdom. Multiple transceivers are employed for different bands and modes. Computers are used for control, datamodes, SDR and logging.

The origins of amateur radio can be traced to the late 19th century, but amateur radio as practiced today began in the early 20th century. The First Annual Official Wireless Blue Book of the Wireless Association of America, produced in 1909, contains a list of amateur radio stations.[3] This radio callbook lists wireless telegraph stations in Canada and the United States, including 89 amateur radio stations. As with radio in general, amateur radio was associated with various amateur experimenters and hobbyists. Amateur radio enthusiasts have significantly contributed to science, engineering, industry, and social services. Research by amateur operators has founded new industries,[4] built economies,[5] empowered nations,[6] and saved lives in times of emergency.[7][8] Ham radio can also be used in the classroom to teach English, map skills, geography, math, science, and computer skills.[9]

Ham radio[edit]

The term 'ham' was first a pejorative term used in professional wired telegraphy during the 19th century, to mock operators with poor Morse code sending skills ('ham-fisted').[10][11][12][13] This term continued to be used after the invention of radio and the proliferation of amateur experimentation with wireless telegraphy; among land- and sea-based professional radio operators, 'ham' amateurs were considered a nuisance. The use of 'ham' meaning 'amateurish or unskilled' survives today in other disciplines ('ham actor').

The amateur radio community subsequently began to reclaim the word as a label of pride,[14] and by the mid-20th century it had lost its pejorative meaning. Although not an acronym, it is often mistakenly written as 'HAM' in capital letters.

Activities and practices[edit]

The many facets of amateur radio attract practitioners with a wide range of interests. Many amateurs begin with a fascination of radio communication and then combine other personal interests to make pursuit of the hobby rewarding. Some of the focal areas amateurs pursue include radio contesting, radio propagation study, public service communication, technical experimentation, and computer networking.

Amateur radio operators use various modes of transmission to communicate. The two most common modes for voice transmissions are frequency modulation (FM) and single sideband (SSB). FM offers high quality audio signals, while SSB is better at long distance communication when bandwidth is restricted.[15]

Radiotelegraphy using Morse code, also known as 'CW' from 'continuous wave', is the wireless extension of landline (wired) telegraphy developed by Samuel Morse and dates to the earliest days of radio. Although computer-based (digital) modes and methods have largely replaced CW for commercial and military applications, many amateur radio operators still enjoy using the CW mode—particularly on the shortwave bands and for experimental work, such as earth-moon-earth communication, because of its inherent signal-to-noise ratio advantages. Morse, using internationally agreed message encodings such as the Q code, enables communication between amateurs who speak different languages. It is also popular with homebrewers and in particular with 'QRP' or very-low-power enthusiasts, as CW-only transmitters are simpler to construct, and the human ear-brain signal processing system can pull weak CW signals out of the noise where voice signals would be totally inaudible. A similar 'legacy' mode popular with home constructors is amplitude modulation (AM), pursued by many vintage amateur radio enthusiasts and aficionados of vacuum tube technology.

Demonstrating a proficiency in Morse code was for many years a requirement to obtain an amateur license to transmit on frequencies below 30 MHz. Following changes in international regulations in 2003, countries are no longer required to demand proficiency.[16] The United States Federal Communications Commission, for example, phased out this requirement for all license classes on 23 February 2007.[17][18]

Modern personal computers have encouraged the use of digital modes such as radioteletype (RTTY) which previously required cumbersome mechanical equipment.[19] Hams led the development of packet radio in the 1970s, which has employed protocols such as AX.25 and TCP/IP. Specialized digital modes such as PSK31 allow real-time, low-power communications on the shortwave bands. EchoLink using Voice over IP technology has enabled amateurs to communicate through local Internet-connected repeaters and radio nodes,[20] while IRLP has allowed the linking of repeaters to provide greater coverage area. Automatic link establishment (ALE) has enabled continuous amateur radio networks to operate on the high frequency bands with global coverage. Other modes, such as FSK441 using software such as WSJT, are used for weak signal modes including meteor scatter and moonbounce communications.

Fast scan amateur television has gained popularity as hobbyists adapt inexpensive consumer video electronics like camcorders and video cards in PCs. Because of the wide bandwidth and stable signals required, amateur television is typically found in the 70 cm (420–450 MHz) frequency range, though there is also limited use on 33 cm (902–928 MHz), 23 cm (1240–1300 MHz) and higher. These requirements also effectively limit the signal range to between 20 and 60 miles (30–100 km).

Linked repeater systems, however, can allow transmissions of VHF and higher frequencies across hundreds of miles.[21] Repeaters are usually located on heights of land or tall structures and allow operators to communicate over hundreds of miles using hand-held or mobile transceivers. Repeaters can also be linked together by using other amateur radio bands, landline, or the Internet.

NASA astronaut Col. Doug Wheelock, KF5BOC, Expedition 24 flight engineer, operates the NA1SS ham radio station in the Zvezda Service Module of the International Space Station. Equipment is a Kenwood TM-D700E transceiver.

Amateur radio satellites can be accessed, some using a hand-held transceiver (HT), even, at times, using the factory 'rubber duck' antenna.[22] Hams also use the moon, the aurora borealis, and the ionized trails of meteors as reflectors of radio waves.[23] Hams can also contact the International Space Station (ISS) because many astronauts and cosmonauts are licensed as amateur radio operators.[24][25]

Amateur radio operators use their amateur radio station to make contacts with individual hams as well as participating in round table discussion groups or 'rag chew sessions' on the air. Some join in regularly scheduled on-air meetings with other amateur radio operators, called 'nets' (as in 'networks'), which are moderated by a station referred to as 'Net Control'.[26] Nets can allow operators to learn procedures for emergencies, be an informal round table, or cover specific interests shared by a group.

Amateur radio operators, using battery- or generator-powered equipment, often provide essential communications services when regular channels are unavailable due to natural disaster or other disruptive events.

Many amateur radio operators participate in radio contests, during which an individual or team of operators typically seek to contact and exchange information with as many other amateur radio stations as possible in a given period of time. In addition to contests, a number of Amateur radio operating award schemes exist, sometimes suffixed with 'on the Air', such as Summits on the Air, Islands on the Air, Worked All States and Jamboree on the Air.


The top of a tower supporting a Yagi-Uda antenna and several wire antennas, along with a Canadian flag
A handheld VHF/UHF transceiver

Radio transmission permits are closely controlled by nations' governments because radio waves propagate beyond national boundaries, and therefore radio is of international concern. Also, radio has possible clandestine uses.

Both the requirements for and privileges granted to a licensee vary from country to country, but generally follow the international regulations and standards established by the International Telecommunication Union[27] and World Radio Conferences.

All countries that license citizens to use amateur radio require operators to display knowledge and understanding of key concepts, usually by passing an exam.[28] The licenses grant hams the privilege to operate in larger segments of the radio frequency spectrum, with a wider variety of communication techniques, and with higher power levels relative to unlicensed personal radio services (such as CB radio, FRS, and PMR446), which require type-approved equipment restricted in mode, range, and power.

Amateur licensing is a routine civil administrative matter in many countries. Amateurs therein must pass an examination to demonstrate technical knowledge, operating competence, and awareness of legal and regulatory requirements, in order to avoid interfering with other amateurs and other radio services. A series of exams are often available, each progressively more challenging and granting more privileges: greater frequency availability, higher power output, permitted experimentation, and, in some countries, distinctive call signs. Some countries, such as the United Kingdom and Australia, have begun requiring a practical assessment in addition to the written exams in order to obtain a beginner's license, which they call a Foundation License.

In most countries, an operator will be assigned a call sign with their license. In some countries, a separate 'station license' is required for any station used by an amateur radio operator. Amateur radio licenses may also be granted to organizations or clubs. In some countries, hams were allowed to operate only club stations.[29]

An amateur radio license is valid only in the country in which it is issued or in another country that has a reciprocal licensing agreement with the issuing country. Some countries, such as Syria and Cuba, restrict operation by foreigners to club stations only.

In some countries, an amateur radio license is necessary in order to purchase or possess amateur radio equipment.[30]

Amateur radio licensing in the United States exemplifies the way in which some countries award different levels of amateur radio licenses based on technical knowledge: three sequential levels of licensing exams (Technician Class, General Class, and Amateur Extra Class) are currently offered, which allow operators who pass them access to larger portions of the Amateur Radio spectrum and more desirable (shorter) call signs. An exam, authorized by the Federal Communications Commission (FCC), is required for all levels of the Amateur Radio license. These exams are administered by Volunteer Examiners, accredited by the FCC-recognized Volunteer Examiner Coordinator (VEC) system. The Technician Class and General Class exams consist of 35 multiple-choice questions, drawn randomly from a pool of at least 350. To pass, 26 of the 35 questions must be answered correctly.[31] The Extra Class exam has 50 multiple choice questions (drawn randomly from a pool of at least 500), 37 of which must be answered correctly.[31] The tests cover regulations, customs, and technical knowledge, such as FCC provisions, operating practices, advanced electronics theory, radio equipment design, and safety. Morse Code is no longer tested in the U.S. Once the exam is passed, the FCC issues an Amateur Radio license which is valid for ten years. Studying for the exam is made easier because the entire question pools for all license classes are posted in advance. The question pools are updated every four years by the National Conference of VECs.[31]

Licensing requirements[edit]

Prospective amateur radio operators are examined on understanding of the key concepts of electronics, radio equipment, antennas, radio propagation, RF safety, and the radio regulations of the government granting the license. These examinations are sets of questions typically posed in either a short answer or multiple-choice format. Examinations can be administered by bureaucrats, non-paid certified examiners, or previously licensed amateur radio operators.

The ease with which an individual can acquire an amateur radio license varies from country to country. In some countries, examinations may be offered only once or twice a year in the national capital and can be inordinately bureaucratic (for example in India) or challenging because some amateurs must undergo difficult security approval (as in Iran). Currently only Yemen and North Korea do not issue amateur radio licenses to their citizens, although in both cases a limited number of foreign visitors have been permitted to obtain amateur licenses in the past decade. Some developing countries, especially those in Africa, Asia, and Latin America, require the payment of annual license fees that can be prohibitively expensive for most of their citizens. A few small countries may not have a national licensing process and may instead require prospective amateur radio operators to take the licensing examinations of a foreign country. In countries with the largest numbers of amateur radio licensees, such as Japan, the United States, Thailand, Canada, and most of the countries in Europe, there are frequent license examinations opportunities in major cities.

Granting a separate license to a club or organization generally requires that an individual with a current and valid amateur radio license who is in good standing with the telecommunications authority assumes responsibility for any operations conducted under the club license or club call sign. A few countries may issue special licenses to novices or beginners that do not assign the individual a call sign but instead require the newly licensed individual to operate from stations licensed to a club or organization for a period of time before a higher class of license can be acquired.

Reciprocal licensing[edit]

Reciprocal agreements by country:
CEPT Member Nations
Members of CEPT and IARP

A reciprocal licensing agreement between two countries allows bearers of an amateur radio license in one country under certain conditions to legally operate an amateur radio station in the other country without having to obtain an amateur radio license from the country being visited, or the bearer of a valid license in one country can receive a separate license and a call sign in another country, both of which have a mutually-agreed reciprocal licensing approvals. Reciprocal licensing requirements vary from country to country. Some countries have bilateral or multilateral reciprocal operating agreements allowing hams to operate within their borders with a single set of requirements. Some countries lack reciprocal licensing systems.

When traveling abroad, visiting amateur operators must follow the rules of the country in which they wish to operate. Some countries have reciprocal international operating agreements allowing hams from other countries to operate within their borders with just their home country license. Other host countries require that the visiting ham apply for a formal permit, or even a new host country-issued license, in advance.

The reciprocal recognition of licenses frequently not only depends on the involved licensing authorities, but also on the nationality of the bearer. As an example, in the US, foreign licenses are recognized only if the bearer does not have US citizenship and holds no US license (which may differ in terms of operating privileges and restrictions). Conversely, a US citizen may operate under reciprocal agreements in Canada, but not a non-US citizen holding a US license.


Many people start their involvement in amateur radio by finding a local club. Clubs often provide information about licensing, local operating practices, and technical advice. Newcomers also often study independently by purchasing books or other materials, sometimes with the help of a mentor, teacher, or friend. Established amateurs who help newcomers are often referred to as 'Elmers', as coined by Rodney Newkirk, W9BRD,[32] within the ham community.[33][34] In addition, many countries have national amateur radio societies which encourage newcomers and work with government communications regulation authorities for the benefit of all radio amateurs. The oldest of these societies is the Wireless Institute of Australia, formed in 1910; other notable societies are the Radio Society of Great Britain, the American Radio Relay League, Radio Amateurs of Canada, Bangladesh NGOs Network for Radio and Communication, the New Zealand Association of Radio Transmitters and South African Radio League. (See Category:Amateur radio organizations)

Call signs[edit]

An amateur radio operator uses a call sign on the air to legally identify the operator or station.[35]In some countries, the call sign assigned to the station must always be used, whereas in other countries, the call sign of either the operator or the station may be used.[36]In certain jurisdictions, an operator may also select a 'vanity' call sign although these must also conform to the issuing government's allocation and structure used for Amateur Radio call signs.[37] Some jurisdictions require a fee to obtain such a vanity call sign; in others, such as the UK, a fee is not required and the vanity call sign may be selected when the license is applied for. The FCC in the U.S. discontinued its fee for vanity call sign applications in September 2015.[38]

Call sign structure as prescribed by the ITU consists of three parts which break down as follows, using the call sign ZS1NAT as an example:

  • ZS – Shows the country from which the call sign originates and may also indicate the license class. (This call sign is licensed in South Africa.)
  • 1 – Gives the subdivision of the country or territory indicated in the first part (this one refers to the Western Cape).
  • NAT – The final part is unique to the holder of the license, identifying that station specifically.

Many countries do not follow the ITU convention for the numeral. In the United Kingdom the original calls G0xxx, G2xxx, G3xxx, G4xxx, were Full (A) License holders along with the last M0xxx full call signs issued by the City & Guilds examination authority in December 2003. Additional Full Licenses were originally granted to (B) Licensees with G1xxx, G6xxx, G7xxx, G8xxx and 1991 onward with M1xxx callsigns. The newer three-level Intermediate License holders are assigned 2E0xxx and 2E1xx, and the basic Foundation License holders are granted call signs M3xxx or M6xxx.[39]

Instead of using numbers, in the UK the second letter after the initial ‘G’ identifies the station’s location; for example, a callsign G7OOE becomes GM7OOE when that license holder is operating a station in Scotland. Prefix 'GM' is Scotland, G or GE is England (the ‘E’ may be omitted), and 'GW' is Wales. More information is available from the UK Radio & Media Licensing Authority (Ofcom) website.

In the United States, for non-vanity licenses, the numeral indicates the geographical district the holder resided in when the license was first issued. Prior to 1978, US hams were required to obtain a new call sign if they moved out of their geographic district.

In Canada, call signs start with VA, VE, VY, VO, and CY. Call signs starting with 'V' end with a number after to indicate the political region; prefix CY indicates geographic islands. Prefix VA1 or VE1 is Nova Scotia, VA2 / VE2 is Quebec, VA3 / VE3 is Ontario, VA4 / VE4 is Manitoba, VA5 / VE5 is Saskatchewan, VA6 / VE6 is Alberta, VA7 / VE7 is British Columbia, VE8 is the Northwest Territories, VE9 is New Brunswick, VY0 is Nunavut, VY1 is Yukon, VY2 is Prince Edward Island, VO1 is Newfoundland, and VO2 is Labrador. CY is for amateurs operating from Sable Island (CY0) or St. Paul Island (CY9), both of which require Coast Guard permission to access. The last two or three letters of the callsigns are typically the operator's choice (upon completing the licensing test, the ham writes three most-preferred options). Two letter callsign suffixes require a ham to have already been licensed for 5 years. Callsigns in Canada can be requested with a fee.

Also, for smaller geopolitical entities, the numeral may be part of the country identification. For example, VP2xxx is in the British West Indies, which is subdivided into VP2Exx Anguilla, VP2Mxx Montserrat, and VP2Vxx British Virgin Islands. VP5xxx is in the Turks and Caicos Islands, VP6xxx is on Pitcairn Island, VP8xxx is in the Falklands, and VP9xxx is in Bermuda.

Online callbooks or callsign databases can be browsed or searched to find out who holds a specific callsign.[40] An example of an online callbook is QRZ.COM. Non-exhaustive lists of famous people who hold or have held amateur radio callsigns have also been compiled and published.[41]

Many jurisdictions (but not in the UK & Europe) may issue specialty vehicle registration plates to licensed amateur radio operators often in order to facilitate their movement during an emergency.[42][43] The fees for application and renewal are usually less than the standard rate for specialty plates.[42][44]


In most administrations, unlike other RF spectrum users, radio amateurs may build or modify transmitting equipment for their own use within the amateur spectrum without the need to obtain government certification of the equipment.[45][46] Licensed amateurs can also use any frequency in their bands (rather than being allocated fixed frequencies or channels) and can operate medium to high-powered equipment on a wide range of frequencies[47] so long as they meet certain technical parameters including occupied bandwidth, power, and prevention of spurious emission.

Radio amateurs have access to frequency allocations throughout the RF spectrum, usually allowing choice of an effective frequency for communications across a local, regional, or worldwide path. The shortwave bands, or HF, are suitable for worldwide communication, and the VHF and UHF bands normally provide local or regional communication, while the microwave bands have enough space, or bandwidth, for amateur television transmissions and high-speed computer networks.

The international symbol for amateur radio, included in the logos of many IARU member societies. The diamond holds a circuit diagram featuring components common to every radio: an antenna, inductor and ground.

In most countries, an amateur radio license grants permission to the license holder to own, modify, and operate equipment that is not certified by a governmental regulatory agency. This encourages amateur radio operators to experiment with home-constructed or modified equipment. The use of such equipment must still satisfy national and international standards on spurious emissions.

Amateur radio operators are encouraged both by regulations and tradition of respectful use of the spectrum to use as little power as possible to accomplish the communication.[48] This is to minimise interference or EMC to any other device. Although allowable power levels are moderate by commercial standards, they are sufficient to enable global communication. Lower license classes usually have lower power limits; for example, the lowest license class in the UK (Foundation licence) has a limit of 10 W.

Power limits vary from country to country and between license classes within a country. For example, the peak envelope power limits for the highest available license classes in a few selected countries are: 2.25 kW in Canada,[49] 1.5 kW in the United States, 1.0 kW in Belgium, Luxembourg, Switzerland and New Zealand, 750 W in Germany, 500 W in Italy, 400 W in Australia, India and the United Kingdom, and 150 W in Oman.

Output power limits may also depend on the mode of transmission. In Australia, for example, 400 W may be used for SSB transmissions, but FM and other modes are limited to 120 W.

The point at which power output is measured may also affect transmissions. The United Kingdom measures at the point the antenna is connected to the signal feed cable, which means the radio system may transmit more than 400 W to overcome signal loss in the cable; conversely, Germany measures power at the output of the final amplification stage, which results in a loss in radiated power with longer cable feeds.[citation needed]

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Certain countries permit amateur radio licence holders to hold a Notice of Variation that allows higher power to be used than normally allowed for certain specific purposes. E.g. in the UK some amateur radio licence holders are allowed to transmit using (33 dBw) 2.0 kW for experiments entailing using the moon as a passive radio reflector (known as Earth-Moon-Earth communication) (EME).

Band plans and frequency allocations[edit]

The International Telecommunication Union (ITU) governs the allocation of communications frequencies worldwide, with participation by each nation's communications regulation authority. National communications regulators have some liberty to restrict access to these bandplan frequencies or to award additional allocations as long as radio services in other countries do not suffer interference. In some countries, specific emission types are restricted to certain parts of the radio spectrum, and in most other countries, International Amateur Radio Union (IARU) member societies adopt voluntary plans to ensure the most effective use of spectrum.

In a few cases, a national telecommunication agency may also allow hams to use frequencies outside of the internationally allocated amateur radio bands. In Trinidad and Tobago, hams are allowed to use a repeater which is located on 148.800 MHz. This repeater is used and maintained by the National Emergency Management Agency (NEMA), but may be used by radio amateurs in times of emergency or during normal times to test their capability and conduct emergency drills. This repeater can also be used by non-ham NEMA staff and REACT members. In Australia and New Zealand ham operators are authorized to use one of the UHF TV channels. In the U.S., amateur radio operators providing essential communication needs in connection with the immediate safety of human life and immediate protection of property when normal communication systems are not available may use any frequency including those of other radio services such as police and fire and in cases of disaster in Alaska may use the statewide emergency frequency of 5167.5 kHz with restrictions upon emissions.[50]

Similarly, amateurs in the United States may apply to be registered with the Military Auxiliary Radio System (MARS). Once approved and trained, these amateurs also operate on US government military frequencies to provide contingency communications and morale message traffic support to the military services.

RangeBandITU Region 1ITU Region 2ITU Region 3
LF2200 m135.7 kHz – 137.8 kHz
MF630 m472 kHz – 479 kHz
160 m1.810 MHz – 1.850 MHz1.800 MHz – 2.000 MHz
HF80 / 75 m3.500 MHz – 3.800 MHz3.500 MHz – 4.000 MHz3.500 MHz – 3.900 MHz
60 m5.3515 MHz – 5.3665 MHz
40 m7.000 MHz – 7.200 MHz7.000 MHz – 7.300 MHz7.000 MHz – 7.200 MHz
30 m[w]10.100 MHz – 10.150 MHz
20 m14.000 MHz – 14.350 MHz
17 m[w]18.068 MHz – 18.168 MHz
15 m21.000 MHz – 21.450 MHz
12 m[w]24.890 MHz – 24.990 MHz
10 m28.000 MHz – 29.700 MHz
VHF6 m50.000 MHz – 52.000 MHz[x]50.000 MHz – 54.000 MHz
4 m[x]70.000 MHz – 70.500 MHzN/A
2 m144.000 MHz – 146.000 MHz144.000 MHz – 148.000 MHz
1.25 mN/A220.000 MHz – 225.000 MHzN/A
UHF70 cm430.000 MHz – 440.000 MHz430.000 MHz – 440.000 MHz
(420.000 MHz – 450.000 MHz)[y]
33 cmN/A902.000 MHz – 928.000 MHzN/A
23 cm1.240 GHz – 1.300 GHz
13 cm2.300 GHz – 2.450 GHz
SHF9 cm3.400 GHz – 3.475 GHz[y]3.300 GHz – 3.500 GHz
5 cm5.650 GHz – 5.850 GHz5.650 GHz – 5.925 GHz5.650 GHz – 5.850 GHz
3 cm10.000 GHz – 10.500 GHz
1.2 cm24.000 GHz – 24.250 GHz
EHF6 mm47.000 GHz – 47.200 GHz
4 mm[y]75.500 GHz[x] – 81.500 GHz76.000 GHz – 81.500 GHz
2.5 mm122.250 GHz – 123.000 GHz
2 mm134.000 GHz – 141.000 GHz
1 mm241.000 GHz – 250.000 GHz
THFSub-mmSome administrations have authorized spectrum for amateur use in this region;
others have declined to regulate frequencies above 300 GHz, leaving them available by default.

[w] HF allocation created at the 1979 World Administrative Radio Conference. These are commonly called the 'WARC bands'.
[x] This is not mentioned in the ITU's Table of Frequency Allocations, but individual administrations may make allocations under 'Article 4.4'. ITU Radio Regulations.. See the appropriate Wiki page for further information.
[y] This includes a currently active footnote allocation mentioned in the ITU's Table of Frequency Allocations. These allocations may only apply to a group of countries.

See also: Radio spectrum, Electromagnetic spectrum

Modes of communication[edit]

Amateurs use a variety of voice, text, image, and data communications modes over radio. Generally new modes can be tested in the amateur radio service, although national regulations may require disclosure of a new mode to permit radio licensing authorities to monitor the transmissions. Encryption, for example, is not generally permitted in the Amateur Radio service except for the special purpose of satellite vehicle control uplinks. The following is a partial list of the modes of communication used, where the mode includes both modulation types and operating protocols.


  • Amplitude modulation (AM)
  • Double Sideband Suppressed Carrier (DSB-SC)
  • Independent Sideband (ISB)
  • Single Sideband (SSB)
  • Amplitude Modulation Equivalent (AME)
  • Frequency modulation (FM)
  • Phase modulation (PM)


  • Amateur Television (ATV), also known as Fast Scan television
  • Slow-Scan Television (SSTV)

Text and data[edit]

Most amateur digital modes are transmitted by inserting audio into the microphone input of a radio and using an analog scheme, such as amplitude modulation (AM), frequency modulation (FM), or single-sideband modulation (SSB).

  • Continuous Wave (CW), usually used for Morse code
  • Automatic Link Establishment (ALE)
  • AMateur Teleprinting Over Radio (AMTOR)
  • Hellschreiber, also referred to as either Feld-Hell, or Hell
  • Discrete multi-tone modulation modes such as Multi Tone 63 (MT63)
  • Multiple Frequency-Shift Keying (MFSK) modes such as
    • JS8Call
  • Packet radio (AX.25)
    • Automatic Packet Reporting System (APRS)
  • Phase-Shift Keying
    • 31 baudbinary phase shift keying: PSK31
    • 31 baudquadrature phase shift keying: QPSK31
    • 63 baudbinary phase shift keying: PSK63
    • 63 baudquadrature phase shift keying: QPSK63
  • Spread spectrum (SS)
  • Radioteletype (RTTY)

Modes by activity[edit]

The following 'modes' use no one specific modulation scheme but rather are classified by the activity of the communication.

  • Earth-Moon-Earth (EME)
  • Internet Radio Linking Project (IRLP)
  • Low Transmitter Power (QRP)
  • Satellite (OSCAR – Orbiting Satellite Carrying Amateur Radio)

See also[edit]


  1. ^'General Regulations Annexed to the International Radiotelegraph Convention'(PDF). International Radiotelegraph Convention of Washington, 1927. London: His Majesty's Stationery Office. 1928. pp. 29–172. Archived from the original(PDF) on 28 July 2017. Retrieved 4 June 2017.
  2. ^Sumner, David (August 2011). 'How Many Hams?'. QST. American Radio Relay League. p. 9.
  3. ^Gernsback, H (May 1909). First Annual Official Wireless Blue Book of the Wireless Association of America(PDF). New York: Modern Electrics Publication. Retrieved 19 June 2009.
  4. ^Brown, Patrick R. J. (1996). The Influence of Amateur Radio on the Development of the Commercial Market for Quartz Piezoelectric Resonators in the United States. 1996 IEEE International Frequency Control Symposium. 5-7 June 1996. Honolulu, Hawaii. doi:10.1109/FREQ.1996.559819.
  5. ^'Inventor of IC 'chip', Nobel Prize Winner Jack S. Kilby Credits Amateur Radio for His Start in Electronics'. 20 June 2005. Retrieved 22 November 2012.
  6. ^Role of Amateur Radio in Development Communication of Bangladesh. Information & Communication Technology for Development. By Bazlur Rahman
  7. ^Jim Taylor. 'Canadian Amateur Radio Bulletin, Amateur Radio 'Saved Lives' in South Asia (2004-12-29)'. Archived from the original on 6 March 2012. Retrieved 22 November 2012.
  8. ^'What is Ham Radio?'. Archived from the original on 4 May 2010. Retrieved 1 June 2010.
  9. ^Weaver, Bruce D. (January 2003). 'On the Air Learning'. Teaching Pre K-8. 33 (4): 50–51. ISSN0891-4508.
  10. ^'Ham Fisted', QST, August 1972, p83.
  11. ^Brady, Jasper Ewing (1899). Tales of the Telegraph. Doubleday & McClure. OCLC3421513.
  12. ^'Ham Radio History'. American Radio Relay League. Retrieved 17 April 2015.
  13. ^Hall, L. C. (January 1902). 'Telegraph Talk and Talkers: The Slang of the Wire'. McClure's Magazine. Vol. 18 no. 3. p. 231.
  14. ^Warner, Kenneth B., ed. (January 1920). 'QST Subscription Contest'. QST. Vol. 3 no. 6. American Radio Relay League. pp. 32–33.
  15. ^'Ham Radio Frequently Asked Questions'. Archived from the original on 6 May 2010. Retrieved 23 May 2010.
  16. ^'FCC Report and Order 06-178A1'(PDF). Federal Communications Commission. 19 December 2006. p. 7. Retrieved 16 May 2007.
  17. ^Federal Communications Commission (24 January 2007). '47 CFR Part 97'(PDF). Federal Register. Washington, D.C.: Government Printing Office. 72 (15): 3081–3082. Retrieved 18 December 2007.
  18. ^'FCC to Drop Morse Testing for All Amateur License Classes'. via 15 December 2006. Retrieved 17 May 2010.
  19. ^'KH6BB USS Missouri Radio Room Photos'. KH6BB USS Missouri Battleship Radio Room, Retrieved 23 May 2010.
  20. ^Valdes, Robert (9 May 2001). 'HowStuffWorks: Use of VoIP in Amateur Radio'. Retrieved 22 November 2012.
  21. ^Taggart, Ralph E (April 1993). 'An Introduction to Amateur Television'(PDF). QSTvia pp. 19–23. Archived from the original(PDF) on 5 June 2007.
  22. ^Holmstead, Stephen (30 December 1994). 'Amateur Satellite FAQ'. The Radio Amateur Satellite Corporation. Retrieved 14 March 2010.
  23. ^Taylor, Joe (December 2001). 'WSJT: New Software for VHF Meteor-Scatter Communication'(PDF). QST via pp. 36–41. Archived(PDF) from the original on 28 January 2010.
  24. ^'ARISS: Amateur Radio on the International Space Station'. Archived from the original on 11 January 2007. Retrieved 10 January 2007.
  25. ^Jurrens, Gerald. 'Astronaut (and Former Astronaut) Hams'. gjurrens at Archived from the original on 30 December 2006. Retrieved 10 January 2007.
  26. ^Haag, Jerry. 'Principles of Amateur Radio Net Control'. Retrieved 10 January 2007.
  27. ^'Amateur and Amateur-satellite service'. International Telecommunication Union. Archived from the original on 22 August 2010. Retrieved 16 August 2010.
  28. ^brweb (1 May 2000). 'International Telecommunication Union, Minimum Qualifications For Radio Amateurs'. Retrieved 22 November 2012.
  29. ^鲍沁勇、徐璟华、林森 (2017). '见证共和国业余无线电发展的人:专访童晓勇/BA1AA'. CQ现代通信 (in Chinese). No. 2017第2期. 北京博趣出版有限责任公司. p. 65. ISSN1000-6559.
  30. ^'Amateur radio licensing in Thailand – sect. Equipment license'. The Radio Amateur Society of Thailand 7 August 2010. Archived from the original on 26 February 2011. Retrieved 13 February 2011.
  31. ^ abc'Amateur Licensing Examinations'. Federal Communications Commission.
  32. ^'285 TechConnect Radio Club'. Archived from the original on 15 March 2015. Retrieved 22 November 2012.
  33. ^'ARRL Mentor Program'. Archived from the original on 14 October 2007.
  34. ^Wilson, Mark J; Reed, Dana G (2006). The ARRL Handbook for Radio Communications 2007 (84th ed.). Newington, CT: American Radio Relay League. ISBN0-87259-976-0.
  35. ^'Amateur Radio (Intermediate) License (A) or (B) Terms, Provisions and Limitations Booklet BR68/I'.
  36. ^'Amateur Radio (Intermediate) License (A) or (B) Terms, Provisions and Limitations Booklet BR68/I'. Retrieved 2 June 2007.
  37. ^'Common Filing Task: Obtaining Vanity Call Sign'. Retrieved 2 June 2007.
  38. ^'Vanity Call Sign Fees'. Retrieved 28 September 2015.
  39. ^'UK Amateur Radio Call Signs (callsigns)'. Electronics Notes. 2016. Archived from the original on 17 October 2016. Retrieved 17 October 2016.
  40. ^'License Search'. Universal Licensing System. US Federal Communications Commission. Archived from the original on 22 August 2010. Retrieved 29 August 2010.
  41. ^'Famous Radio Amateurs 'Hams' & Call Signs'. Bedworth Lions Club. Retrieved 29 August 2010.
  42. ^ ab'ARRL Web: Amateur Radio License Plate Fees'. Archived from the original on 4 August 2007.
  43. ^'Ham Radio Callsign License Plates (Canada)'. Archived from the original on 7 December 2008. Retrieved 4 December 2008.
  44. ^'ICBC – HAM radio plates'. Archived from the original on 19 October 2008. Retrieved 3 December 2008.
  45. ^OFTA, Equipment for Amateur Station: Radio amateurs are free to choose any radio equipment designed for the amateur service. Radio amateurs may also design and build their own equipment provided that the requirements and limitations specified in the Amateur Station Licence and Schedules thereto are complied with. Archived 14 October 2007 at the Wayback Machine
  46. ^', About Amateur Stations. 'They design, construct, modify, and repair their stations. The FCC equipment authorization program does not generally apply to amateur station transmitters.''. 19 February 2002. Retrieved 22 November 2012.
  47. ^'Australian Radio Amateur FAQ'. 24 June 2006. Archived from the original on 18 July 2008.
  48. ^'FCC Part 97 : Sec. 97.313 Transmitter power standards'. Retrieved 27 August 2010.
  49. ^Industry Canada (September 2007). 'RBR-4 – Standards for the Operation of Radio Stations in the Amateur Radio Service, s. 10.2'. Government of Canada. Retrieved 21 January 2013.
  50. ^'FCC Part 97 : Sec. 97.401 and 97.403 Emergency Communications'. Retrieved 21 June 2012.
General references
  • Bertrand, Ron; Wait, Phil (2005). Your Entry Into Amateur Radio: The Foundation License Manual (1st ed.). Wireless Institute of Australia. ISBN0-9758342-0-7.
  • Cleveland-Iliffe, John; Smith, Geoffrey Read (1995). The Canadian Amateur Study Guide for the Basic Qualification (5th ed.). Radio Amateurs of Canada. ISBN1-895400-08-2.
  • Shaji, P. B. (2013). 'Introduction to Amateur Radio'. HamRadioIndia.
United Kingdom
  • Betts, Alan (2004). Foundation License Now! (3rd ed.). Radio Society of Great Britain. ISBN1-872309-80-1.
United States
  • Wolfgang, Larry D., ed. (2003). Now You're Talking! All You Need For Your First Amateur Radio License (5th ed.). American Radio Relay League. ISBN0-87259-881-0.
  • Hennessee, John, ed. (2003). The ARRL FCC Rule Book (13th ed.). American Radio Relay League. ISBN0-87259-900-0.
  • Silver, H. Ward (2004). Ham Radio for Dummies. John Wiley & Sons. ISBN0-7645-5987-7.

Further reading[edit]

  • Bergquist, Carl J. (May 2001). Ham Radio Operator's Guide (2nd ed.). Indianapolis: Prompt Publications. ISBN0-7906-1238-0.
  • Dennison, Mike; Fielding, John, eds. (2009). Radio Communication Handbook (10th ed.). Bedford, England: Radio Society of Great Britain. ISBN978-1-905086-54-2.
  • Haring, Kristen (2007). Ham Radio's Technical Culture. Cambridge, MA: MIT Press. ISBN0-262-08355-8.
  • Poole, Ian D. (October 2001). HF Amateur Radio. Potters Bar, Hertfordshire, England: Radio Society of Great Britain. ISBN1-872309-75-5.
  • Rohde, Ulrich L.; Whitaker, Jerry C. (2001). Communications Receivers: DSP, Software Radios, and Design (3rd ed.). New York City: McGraw-Hill. ISBN0-07-136121-9.
  • The ARRL Handbook for Radio Communications 2010 (87th ed.). Newington, CT: American Radio Relay League. November 2009. ISBN0-87259-144-1.

External links[edit]

Wikimedia Commons has media related to Amateur radio.
Wikiversity has learning resources about Amateur radio
Wikibooks has a book on the topic of: Amateur Radio Manual
  • Amateur Radio at Curlie
Retrieved from ''
Regions with 220 MHz allocations:
Green areas allocate the whole band.
Blue areas allocate a portion of the band.
Red areas are in ITU Region 2, and do not allocate the 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.[1] 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.[1][2][3] It is not available for use in ITU Region 1 (except in Somalia[4]) or ITU Region 3.[1] The license privileges of amateur radio operators include the use of frequencies within this band, which is primarily used for local communications.

  • 1History
  • 2Band usage


The 1.25-meter band has a very long and colorful history dating back to before World War II.

Pre-Cairo Conference[edit]

Some experimental amateur use in the U.S. was known to occur on the '1¼-meter band' as early as 1933, with reliable communications achieved in fall of 1934.[5]

The Cairo Conference[edit]

In 1938 the FCC gave U.S. amateurs privileges in two VHF bands: 2.5 meters (112 MHz) and 1.25 meters (224 MHz).[6] Both bands (as well as 70 centimeters) were natural harmonics of the 5-meter band. Amateur privileges in the 2.5-meter band were later reallocated to 144–148 MHz (becoming the modern-day 2-meter band), and the old frequencies were reassigned to aircraft communication during World War II. At this time, the 1.25-meter band expanded to a 5 MHz bandwidth, spanning 220–225 MHz.

The VHF/UHF explosion[edit]

Amateur use of VHF and UHF allocations exploded in the late 1960s and early 1970s as repeaters started going on the air. Repeater use sparked a huge interest in the 2-meter and 70-centimeter (420–450 MHz) bands, however, this interest never fully found its way into the 1.25-meter band. Many amateurs attribute this to the abundance of commercial radio equipment designed for 136–174 MHz and 450–512 MHz that amateurs could easily modify for use on the 2-meter and 70-centimeter bands. There were no commercial frequency allocations near the 1.25-meter band, and little commercial radio equipment was available. This meant that amateurs who wanted to experiment with the 1.25-meter band had to build their own equipment or purchase one of the few radios available from specialized amateur radio equipment manufacturers. Many of the repeaters which have been constructed for 1.25-meter operation have been based on converted land-mobile base station hardware,[7] often extensively modifying equipment originally designed for other VHF bands.[8]

U.S. Novice licensees get privileges[edit]

By the 1980s, amateur use of 2-meter and 70-centimeter bands was at an all-time high while activity on 1.25 meters remained stagnant.[citation needed] In an attempt to increase use on the band, many amateurs called for holders of Novice-class licenses (the entry-level class at that time) to be given voice privileges on the band. In 1987, the FCC modified the Novice license to allow voice privileges on portions of the 1.25-meter and 23-centimeter (1.24–1.30 GHz) bands. In response, some of the bigger amateur radio equipment manufacturers started producing equipment for 1.25 meters. However, it never sold well, and by the early 1990s, most manufacturers had stopped producing equipment for the band.[citation needed]

U.S. reallocation[edit]

In 1973, the FCC considered Docket Number 19759, which was a proposal to establish a Class E Citizen's band service at 224 MHz. The proposal was opposed by the ARRL and after the explosive growth of 27 MHz Citizen's Band usage, the FCC dropped consideration of the docket in 1977.[9]

In the late 1980s, United Parcel Service (UPS) began lobbying the FCC to reallocate part of the 1.25-meter band to the Land Mobile Service. UPS had publicized plans to use the band to develop a narrow-bandwidth wireless voice and data network using a mode called ACSSB (amplitude-companded single sideband). UPS's main argument for the reallocation was that amateur use of the band was very sparse and that the public interest would be better served by reallocating part of the band to a service that would put it to good use.[10]

In 1988, over the objections of the amateur radio community, the FCC adopted the 220 MHz Allocation Order, which reallocated 220–222 MHz to private and federal government land-mobile use while leaving 222–225 MHz exclusively for amateur use. The reallocation proceeding took so long, however, that UPS eventually pursued other means of meeting its communications needs. UPS entered into agreements with GTE, McCall, Southwestern Bell, and Pac-Tel to use cellular telephone frequencies to build a wireless data network. With the 220–222 MHz band now left unused, the FCC issued parts of the band to other private commercial interests via a lottery in hopes that it would spark development of super-narrowband technologies, which would help them gain acceptance in the marketplace.[citation needed] In the 1990s and into the 2000s paging companies made use of the 1.25-meter band. Most all such usage had ended by the mid 2000s with the companies being purchased by others and services moved to newer systems or having gone out of business.

Canadian reallocation[edit]

Until January 2006,[11] Canadian amateur radio operators were allowed to operate within the entire 220–225 MHz band. Canadian operations within 120 km of the United States border were required to observe a number of restrictions on antenna height and power levels to coordinate use with non-amateur services in the United States.[12]

In 2005 Industry Canada decided to reallocate 220–222 MHz to land mobile users, similar to the US, but unlike in the US, a provision was included to allow the amateur service, in exceptional circumstances, to use the band in disaster relief efforts on a secondary basis. In addition, the band 219 to 220 MHz was allocated to the amateur service on a secondary basis. Both of these reallocations went into effect January 2006.[3][11]

Band usage[edit]

Arrl Handbook 2016 Pdf Download Windows 10

Canadian band plan[edit]

Band plan
License class219–220220–222222.00–222.05222.05–222.10222.10–222.275222.275–222.3222.31–223.37223.39–223.49223.49–223.59223.59–223.89223.91–225
Basic(+), Advanced
Key for the band plan
= Available on a secondary basis to other users.[3][11]
= Available only to assist with disaster relief efforts.[3][11]
= Reserved for EME (moon bounce)
= Continuous wave (CW), 222.1 calling freq.
= SSB, 222.2 calling freq.
= propagation beacons
= FM Repeaters (input −1.6 MHz)
= High speed data
= FM simplex

Scope of operation in North America[edit]

Wouxun KG-UVD1P dual watch handheld for 2M and 220 MHz.

Today, the 1.25-meter band is used by many amateurs who have an interest in the VHF spectrum.

There are pockets of widespread use across the United States, mainly in New England and western states such as California and Arizona with more sporadic activity elsewhere. The number of repeaters on the 1.25-meter band has grown over the years to approximately 1,500 nationwide as of 2004.[13]

The attention that band received in the late 1980s and early 1990s due to the reallocation of its bottom 2 MHz sparked renewed amateur interest. Many amateurs feared that lack of 1.25-meter activity would lead to reallocation of the remaining 3 MHz to other services.[14] Today, new handheld and mobile equipment is being produced by amateur radio manufacturers, and it is estimated that more amateurs have 1.25-meter equipment now than at any point in the past.[15]

Auxiliary stations[edit]

An auxiliary station, most often used for repeater control or link purposes or to remotely control another station, is limited in the United States to operation on frequencies above 144.5 MHz[16] excluding 144.0–144.5 MHz, 145.8–146.0 MHz, 219–220 MHz, 222.00–222.15 MHz, 431–433 MHz, and 435–438 MHz. Operation of such control links in the crowded 2-meter band is problematic[17] and on many frequencies in that band expressly prohibited, leaving 1.25-meter band frequencies as the lowest available for remote control of repeaters and unattended stations.[18]

List of transceivers[edit]

Standard c228a dual band handheld for 2M and 220 MHz.

Since the band is allocated mostly in ITU Region 2 (Somalia, in Region 1, being the only exception thus far), the major equipment manufacturers (Kenwood, Yaesu, and Icom) do not often offer transceiver models that cover the frequency range. (see US Novice licensees get privileges). This exacerbates the lack of usage of the 1.25-meter band, though manufacturers argue that what equipment they have produced hasn't sold well compared to other products.[citation needed]

In recent years, Kenwood and Yaesu have both included the 1.25-meter band in some of their multiband handheld transceivers. The Kenwood TH-F6A and TH-D74A; the Yaesu VX-6R, VX-7R and VX-8R (USA and Canada version) include coverage of the 1.25-meter band in addition to the more popular 2-meter and 70-centimeter bands. Wouxun now has the KG-UVD1P in a 2-meter/1.25-meter model, legal for use in the United States. In the 1980s, ICOM offered the IC-37A—a 220-MHz, 25-watt FM transceiver that can still be obtained as used equipment from various sources such as eBay and private collectors. In 2013, the BaoFeng UV-82X, an inexpensive 2-meter/1.25 meter handheld, became available.

Several 1.25-meter base/mobile transceivers are available. Among these are the Alinco DR-235T,[19] the Jetstream JT220M,[20] BTech UV-2501-220, BTech UV-25X4 quadband, and the TYT TH-9000 monoband radio, which comes in a 1.25-meter model.

The Chinese company Wouxun offers a 2- and 1.25-meter dual-band HT, the KG-UVD1P.[21] These have received FCC approval in the United States; but are awaiting approval by Industry Canada.[citation needed]

Elecraft offers an all-mode (CW, FM, SSB) transverter for the band[22] compatible with its K2 and K3 transceivers.

Countries with known allocations[edit]

ITU Region 1

  • Somalia (220–225 MHz)[4]

ITU Region 2

  • Anguilla (220–225 MHz)[23]
  • Argentina (220–225 MHz)[24]
  • Aruba (220–225 MHz)[25]
  • Barbados (222–225 MHz)[26]
  • Belize (220–225 MHz)[27]
  • Bermuda (220–225 MHz)
  • Bolivia (220–225 MHz)[28]
  • Bonaire (220–225 MHz)[29]
  • Brazil (220–225 MHz)
  • British Virgin Islands (220–225 MHz)
  • Canada (222–225 MHz amateur primary exclusive; 219–220 MHz secondary and shared; 220–222 MHz, only for 'disaster relief' )[3][11]
  • Cayman Islands (220–225 MHz)[30]
  • Chile (220–225 MHz)[31]
  • Costa Rica (222–225 MHz)[32]
  • Colombia (220–225 MHz)[33]
  • Cuba (222.9–224.6 MHz)[34]
  • Curaçao (220–225 MHz)[35]
  • Dominica (222.340–224.000 MHz)[36]
  • Dominican Republic (220–225 MHz)[37]
  • Ecuador (220–225 MHz)[38]
  • El Salvador (220–225 MHz)[39]
  • French Overseas Departments and Territories in Region 2 (220–225 MHz)[40]
    • Overseas Departments:
    • Overseas collectivities:
  • Haiti (220–225 MHz)[41]
  • Honduras (222–225 MHz)[42][43]
  • Jamaica (220–225 MHz)
  • Mexico (222–225 MHz) (Band is channelized in some segments and shared with commercial and government operations, including police.)[44]
  • Montserrat (220–225 MHz)[45]
  • Nicaragua (220–225 MHz)
  • Panama (220–225 MHz)[46]
  • Paraguay (220–225 MHz)[47]
  • Peru (220–222 MHz)[48]
  • Sint Maarten (220–225 MHz)[49]
  • Suriname (220–225 MHz)[50]
  • Trinidad and Tobago (220–225 MHz)[51]
  • Turks and Caicos Islands (222–225 MHz)[52]
  • United States of America (222–225 MHz amateur primary exclusive; 219–220 MHz secondary, shared and limited)[1][2]
  • Uruguay (220–225 MHz)[53]
  • Venezuela (220–225 MHz)[54]


  1. ^ abcd'FCC Online Table of Frequency Allocations'(PDF). 47 C.F.R. Federal Communications Commission. 2 June 2011. Retrieved 2 September 2011.
  2. ^ ab'US Amateur Radio Frequency Allocations'. The American Radio Relay League. 1.25 Meters. Retrieved 2 September 2011.
  3. ^ abcde'Canadian Table of Frequency Allocations'(PDF). Industry Canada. February 2007. pp. 24 & 99. Retrieved 2 September 2011. C11 In the band 219–220 MHz, the amateur service is permitted on a secondary basis. In the band 220–222 MHz, the amateur service may be permitted in exceptional circumstances on a secondary basis to assist in disaster relief efforts.
  4. ^ ab'Regarding authorised amateur radio frequency bands and transmitter power output in Somalia'(PDF). 22 June 2004. Ministry of Information, Telecommunication and Culture Garowe, Puntland, Somalia. p. 2. Archived from the original(PDF) on 10 September 2008. Retrieved 26 March 2013.
  5. ^DeSoto. Clinton B. 200 Meters and Down: The Story of Amateur Radio, 2001 edition. Newington, Conn.: The Amateur Radio Relay League. p. 129.
  6. ^Francis Colt de Wolf. The Cairo Telecommunication Conferences. The American Journal of International Law, 32;3(July 1938):562–568.
  7. ^GE Mastr II Modifications for 220MHz, WB6RHQ, 20 January 1989 Accessed 2009-03-27. Archived 25 April 2009.
  8. ^222 MHz Motorola Micor Modifications, Kevin Custer W3KKC, Scott Zimmerman N3XCC Accessed 2009-03-27. Archived 25 April 2009.
  9. ^ JPL amateur radio club newsletter, retrieved 2010 Feb 09
  10. ^Why 220MHz?, Todd Ellis, 220MHz: An MRT Special Report (MRT Magazine), 6 Mar 2002. Accessed 2013-03-26. (Formerly
  11. ^ abcde'Spectrum Allocation and Utilization Policy Regarding the Use of Certain Frequency Bands Below 1.7 GHz for a Range of Radio Applications'(PDF). Industry Canada. June 2009. Retrieved 2 September 2011. In the public consultation, the Department proposed provisional changes to the Canadian Table of Frequency Allocations in the bands 216–220 MHz and 220–225 MHz. As a result, the following allocation decisions for both bands and the spectrum utilization policy for 220–225 MHz were implemented in January 2006:
  12. ^'Interpretation of the U.S.-Canada For 220-222 MHz'. Radio Amateurs of Canada. Archived from the original on 6 March 2010. Retrieved 14 March 2010.
  13. ^Repeaters – what are they and how to use them, American Radio Relay League Accessed 2009-03-27. Archived 25 April 2009.
  14. ^220 MHz (125 cm) info, Radio Amateurs of Canada, 2004. Accessed 2009-03-27. Archived 25 April 2009.
  15. ^Getting on the 220 Band, St. Lawrence ValleyRepeater Council Accessed 2009-03-27. Archived 25 April 2009.
  16. ^FCC regulations, part 97, subpart C--Special Operations
  17. ^Federal Communications Commission In the Matter of Kenwood Communications Corp. Request for Declaratory Ruling to Determine Compliance With Applicable Sections of Part 97 of the Commission's Rules or Waiver of Applicable Rule Sections, 28 July 2000
  18. ^What is the difference between a repeater and an auxiliary station?, Gary Hendrickson W3DTN
  19. ^DR-235TMKIII 25W FM Mobile/Base unitArchived 13 October 2004 at the Wayback Machine
  20. ^220 MHz 50 watt radioArchived 28 May 2009 at the Wayback Machine
  21. ^'Handheld Two-way Radio with Dual band Dual frequency Dual display Dual standby KG-UVD1P'. Wouxun. Archived from the original on 12 December 2009. Retrieved 6 November 2009.
  22. ^'Elecraft XV Series Transverters'. Archived from the original on 9 April 2018. Retrieved 15 May 2007.
  23. ^'Anguilla Table of Frequency Allocations 88 MHz to 59 GHz'(PDF). Ministry of Infrastructure Communications Utilities and Housing (MICUH). p. 12. Archived from the original(PDF) on 22 December 2015. Retrieved 8 August 2015.
  24. ^'Reglamento General del Servicio de Radioaficionados' [General Rules of the Amateur Radio Service] (PDF) (in Spanish). Ministry of Communications. p. 67. Archived from the original(PDF) on 22 December 2015. Retrieved 10 August 2015.
  25. ^Aruba application for a visitor's license. accessed 1 November 2008.
  26. ^'Spectrum Management Handbook'. Telecommunications Unit Barbados. p. 27. Archived from the original(DOC) on 22 December 2015. Retrieved 10 August 2015.
  27. ^Belize National Frequency Spectrum Allocation Plan, April 2002. Retrieved March 23, 2016.
  28. ^'Plan Nacional de Frecuencias' [National Frequency Plan] (PDF) (in Spanish). Ministry of Public Works and Housing Services. p. 55. Retrieved 8 August 2015.
  29. ^'Application for Amateur Radio License'(PDF). Netherlands Radiocommunications Agency. p. 2. Retrieved 8 August 2015.
  30. ^'The Information and Communications Technology Authority (Amateur Radio Licences) Regulations, 2010'(PDF). Information and Communications Technology Authority. p. 10. Retrieved 10 August 2015.
  31. ^'Presentación del Proyecto de Norma de Estaciones Repetidoras y Radiobalizas' [Presentation of the Draft of Relay Stations and beacons] (in Spanish). Federación de Clubes de Radioaficionados de Chile. Retrieved 10 August 2015.
  32. ^'Plan Nacional de Atribución de Frecuencias' [National Frequency Allocation Plan] (in Spanish). Ministry of Science, Technology and Telecommunications. p. 209. Archived from the original(PDF) on 24 September 2015. Retrieved 10 August 2015.
  33. ^'Cuadro Nacional de Atribución de Bandas de Frecuencias' [National Table of Frequency Allocations] (in Spanish). The National Spectrum Agency. p. 52. Archived from the original(PDF) on 22 December 2015. Retrieved 8 August 2015.
  34. ^'Reglamento Sobre el Servicio de radioaficionados de Cuba' [Regulations on the amateur radio service in Cuba] (PDF) (in Spanish). Ministry of Informatics and Communications. p. 21. Archived from the original(PDF) on 22 December 2015. Retrieved 10 August 2015.
  35. ^'Application for Amateur Radio License'(PDF). Bureau Telecommunications and Post (BT&P). p. 2. Archived from the original(PDF) on 23 September 2015. Retrieved 8 August 2015.
  36. ^'Telecommunications (Amateur Radio) Regulations, 2012'(PDF). Minister for Telecommunication. p. 15. Archived from the original(PDF) on 23 September 2015. Retrieved 12 August 2015.
  37. ^'Plan Nacional de Atribucion de Frecuencias' [National Frequency Allocation Plan] (in Spanish). Dominican Institute of telecommunications (INDOTEL). p. 34. Archived from the original(PDF) on 24 September 2015. Retrieved 8 August 2015.
  38. ^'Plan Nacional de Frecuencias' [National Frequency Plan] (PDF) (in Spanish). The National Telecommunications Council (CONATEL). p. 62. Retrieved 8 August 2015.
  39. ^'Cuadro Nacional de Atribución de Frecuencias' [National Table of Frequency Allocations] (PDF) (in Spanish). General Superintendency of Electricity and Telecommunications (SIGET). p. 52. Archived from the original(PDF) on 4 March 2016. Retrieved 10 August 2015.
  40. ^'Décision no 2013-1515' [Decision No. 2013-1515] (PDF) (Press release) (in French). Autorité de Régulation des Communications Électroniques et des Postes. Réseau des Émetteurs Français. 17 December 2013. pp. 4–5. Archived(PDF) from the original on 17 March 2014. Retrieved 17 March 2014.
  41. ^'Loi sur les télécommunications' [Telecommunications Act] (PDF) (in French). National Council of Telecommunications (CONATEL). p. 22. Archived from the original(PDF) on 22 December 2015. Retrieved 10 August 2015.
  42. ^'Plan Nacional de Atribución de Frecuencias' [National Frequency Allocation Plan] (PDF) (in Spanish). National Telecommunications Commission (CONATEL). p. 46. Archived from the original(PDF) on 22 December 2015. Retrieved 10 August 2015.
  43. ^'RESOLUCIÓN NR007/10' [Resolution NR007 / 10] (PDF) (in Spanish). National Telecommunications Commission (CONATEL). p. 21. Retrieved 8 August 2015.
  44. ^'Mexico Amateur Radio frequency bands and channel allocations'(PDF). 15 December 1994. Archived from the original(PDF) on 19 October 2009. Retrieved 1 November 2008.
  45. ^'Info-Communications Authority's Spectrum Plan for the Island of Montserrat'(PDF). The Info-Communications Authority of Montserrat. p. 24. Retrieved 10 August 2015.
  46. ^'Manual del Radioaficionado' [Amateur Radio Manual] (PDF) (in Spanish). Ministry of Government and Justice. 2005. p. 107. Archived from the original(PDF) on 22 December 2015. Retrieved 10 August 2015.
  47. ^'Plan Nacional de Atribucion de Frecuencias de la Republica del Paraguay' [National Frequency Allocation Plan of the Republic of Paraguay] (in Spanish). National Telecommunications Commission (CONATEL). p. 18. Archived from the original(DOC) on 22 December 2015. Retrieved 8 August 2015.
  48. ^'Reglamento del Servicio de Radioaficionados' [Amateur Radio Service Regulations] (in Spanish). Radio Club Peruano. p. 12. Archived from the original(DOC) on 30 September 2013. Retrieved 14 August 2015.
  49. ^'Amateur Radio License Application Form'(PDF). Bureau Telecommunications and Post St. Maarten. p. 2. Retrieved 8 August 2015.
  50. ^'National Frequentie Plan Suriname (NFPS)' [National Frequency Plan Suriname (NFPS)] (PDF) (in Dutch). Telecommunication Authority Suriname (TAS). p. 83. Archived from the original(PDF) on 21 February 2015. Retrieved 10 August 2015.
  51. ^'Trinidad and Tobago Frequency Allocation Table (9 kHz to 1000 GHz)'. The Telecommunications Authority of Trinidad and Tobago. 16 October 2009. p. 27. Archived from the original(PDF) on 21 July 2011. Retrieved 15 November 2009.
  52. ^'Wireless Telegraphy (Amateur Radio Operator Licensing) Regulations 2004'(PDF). Turks and Caicos Amateur Radio Society. p. 5. Archived from the original(PDF) on 24 September 2015. Retrieved 10 August 2015.
  53. ^'Reglamento Servicio de Radioaficionados' [Regulation amateur service] (PDF) (in Spanish). Regulatory Unit of Communications Services (URSEC). p. 14. Retrieved 8 August 2015.
  54. ^'Cuadro Nacional de Atribución de Bandas de Frecuencias' [National Table of Frequency Allocations] (PDF) (in Spanish). National Telecommunications Commission. p. 17. Retrieved 8 August 2015.
RangeBandITU Region 1ITU Region 2ITU Region 3
LF2200 m135.7 kHz – 137.8 kHz
MF630 m472 kHz – 479 kHz
160 m1.810 MHz – 1.850 MHz1.800 MHz – 2.000 MHz
HF80 / 75 m3.500 MHz – 3.800 MHz3.500 MHz – 4.000 MHz3.500 MHz – 3.900 MHz
60 m5.3515 MHz – 5.3665 MHz
40 m7.000 MHz – 7.200 MHz7.000 MHz – 7.300 MHz7.000 MHz – 7.200 MHz
30 m[w]10.100 MHz – 10.150 MHz
20 m14.000 MHz – 14.350 MHz
17 m[w]18.068 MHz – 18.168 MHz
15 m21.000 MHz – 21.450 MHz
12 m[w]24.890 MHz – 24.990 MHz
10 m28.000 MHz – 29.700 MHz
VHF6 m50.000 MHz – 52.000 MHz[x]50.000 MHz – 54.000 MHz
4 m[x]70.000 MHz – 70.500 MHzN/A
2 m144.000 MHz – 146.000 MHz144.000 MHz – 148.000 MHz
1.25 mN/A220.000 MHz – 225.000 MHzN/A
UHF70 cm430.000 MHz – 440.000 MHz430.000 MHz – 440.000 MHz
(420.000 MHz – 450.000 MHz)[y]
33 cmN/A902.000 MHz – 928.000 MHzN/A
23 cm1.240 GHz – 1.300 GHz
13 cm2.300 GHz – 2.450 GHz
SHF9 cm3.400 GHz – 3.475 GHz[y]3.300 GHz – 3.500 GHz
5 cm5.650 GHz – 5.850 GHz5.650 GHz – 5.925 GHz5.650 GHz – 5.850 GHz
3 cm10.000 GHz – 10.500 GHz
1.2 cm24.000 GHz – 24.250 GHz
EHF6 mm47.000 GHz – 47.200 GHz
4 mm[y]75.500 GHz[x] – 81.500 GHz76.000 GHz – 81.500 GHz
2.5 mm122.250 GHz – 123.000 GHz
2 mm134.000 GHz – 141.000 GHz
1 mm241.000 GHz – 250.000 GHz
THFSub-mmSome administrations have authorized spectrum for amateur use in this region;
others have declined to regulate frequencies above 300 GHz, leaving them available by default.

[w] HF allocation created at the 1979 World Administrative Radio Conference. These are commonly called the 'WARC bands'.
[x] This is not mentioned in the ITU's Table of Frequency Allocations, but individual administrations may make allocations under 'Article 4.4'. ITU Radio Regulations.. See the appropriate Wiki page for further information.
[y] This includes a currently active footnote allocation mentioned in the ITU's Table of Frequency Allocations. These allocations may only apply to a group of countries.

See also: Radio spectrum, Electromagnetic spectrum
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