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Transmission of information via microwaves
microwaves have been used for wireless power transmission. Microwave radio relay is a technology widely used in the 1950s and 1960s for transmitting information
Microwave_transmission
Radio stations that cannot communicate directly due to distance, terrain or other difficulties sometimes use an intermediate radio relay station to relay
Radio_relay
American organization of amateur radio enthusiasts
The American Radio Relay League (ARRL) is the largest membership association of amateur radio enthusiasts in the United States. The ARRL is a non-profit
American_Radio_Relay_League
Airborne radio relay is a technique employing aircraft fitted with radio relay stations for the purpose of increasing the range, flexibility, or physical
Airborne_radio_relay
Former radio mast near Gąbin, Poland
to provide a radio link for programme feeds from the studio, which ran from the Palace of Culture and Science, Warsaw via a radio relay tower at Wiejca
Warsaw_radio_mast
Non-commercial use of the radio spectrum
Amateur Radio Union (IARU), which has three regions and includes national amateur radio societies in most countries. In 2011 the American Radio Relay League
Amateur_radio
Radio communication system implemented in software
American Radio Relay League: 10–18 Youngblood, Gerald (Nov–Dec 2002), "A Software Defined Radio for the Masses, Part 3" (PDF), QEX, American Radio Relay League:
Software-defined_radio
Communications installation in Switzerland
The Jungfraujoch radio relay station (German: Richtfunkstation Jungfraujoch) is a former Swisscom microwave radio relay station atop the Jungfraujoch,
Jungfraujoch radio relay station
Jungfraujoch_radio_relay_station
Repeater transmitter
broadcast relay station, also known as a satellite station, relay transmitter, broadcast translator (U.S.), re-broadcaster (Canada), repeater (two-way radio) or
Broadcast_relay_station
Latvian military unit
companies - the Radio Communications Company and Radio Relay Company. The Radio Communications Company consists of a Headquarters Group, Radio Control Section
Staff_Battalion_(Latvia)
Christian Community 99.3 MHz – Sky Sports Radio – Relay of Racing Radio – Narrowcast 100.9 MHz – ABC News Radio – Continuous news plus parliamentary broadcasts
List of radio stations in Australia
List_of_radio_stations_in_Australia
Type of radio-signal reflector
blocks any direct, line of sight communication. Compared to a microwave radio relay station with active components, a passive repeater is far simpler and
Passive_repeater
American airborne radio relay aircraft
Beechcraft QU-22 Pave Eagle is an American optionally-piloted airborne radio relay aircraft based on the Beechcraft Bonanza. Designed to replace the Lockheed
Beechcraft_QU-22_Pave_Eagle
Mast radiator insulated against ground in California, United States
Hawes Radio Relay Facility (also known as the Hawes Radio Tower) was a United States Air Force installation built on the site of the former Hawes Airfield
Hawes_Radio_Relay_Site
Behaviour of travelling radio waves
phones, walkie-talkies, wireless networks, point-to-point microwave radio relay links, FM and television broadcasting and radar. Satellite communication
Radio_propagation
Low-power amateur radio
org. American Radio Relay League. Retrieved 24 November 2019. Dennison, Mike; Fielding, John (2007). Radio Communication Handbook. Radio Society of Great
QRP_operation
Competitive activity
the American Radio Relay League ("ARRL"). Depending on the rules for a particular contest, each multiplier may count once on each radio band or only once
Contesting
Transmission of language with brief pulses
Radio amateur's library. Vol. 69. American Radio Relay League. ISBN 0-87259-035-6. Eckersley, R.J., ed. (1985). Amateur Radio Operating Manual. Radio
Morse_code
Area in which radio transmissions are heavily restricted
The National Radio Quiet Zone (NRQZ) is a large area of land in the United States designated as a radio quiet zone, in which radio transmissions are restricted
United States National Radio Quiet Zone
United_States_National_Radio_Quiet_Zone
Highest mountain in the Indian state of Karnataka
The summit of Mullayanagiri has a small temple and houses a police radio relay station. Seethalayyanagiri is a prominent peak which is adjacent to this
Mullayyanagiri
Glacier saddle in the Swiss Alps
Global Atmosphere Watch's atmospheric research stations. The Jungfraujoch radio relay station, which is not accessible to the public, is installed west of
Jungfraujoch
Military unit
Communications Squadron, Operations on 1 July 1952 Redesignated 261st Radio Relay Squadron on 23 September 1960 Redesignated 261st Mobile Communications
261st Cyberspace Operations Squadron
261st_Cyberspace_Operations_Squadron
Relay station
radio repeater is a radio receiver and transmitter that retransmits a radio signal. A broadcast relay station is a repeater used in broadcast radio and
Repeater
Use of radio waves for communication
[page needed] Tony Dorbuck (ed.), The Radio Amateur's Handbook, Fifty-Fifth Edition, American Radio Relay League, 1977, p. 368 John Avison, The World
Radio
NATO radiogram format
(messages relayed by telegraphy) ACP-125 defines the format of messages relayed by voice ACP-126 defines the format of messages relayed by radio teletype
16-line_message_format
A relay league is a chain of message forwarding stations in a system of optical telegraphs, radio telegraph stations, or riding couriers. Early 19th century
Relay_league
American Radio Relay League, Inc. v. FCC, 617 F.2d 875 (D.C. Cir. 1980) was a notable Court of Appeals for the DC Circuit case between plaintiff, the
American Radio Relay League, Inc. v. FCC (1980)
American_Radio_Relay_League,_Inc._v._FCC_(1980)
Gathering of amateur radio operators
Traffic System (NTS), organized and operated by members of the American Radio Relay League (ARRL) to handle routine and emergency messages on a nationwide
Amateur_radio_net
Transmission line in a long-distance communications network
long-distance communications network such as carrier systems, microwave radio relay links, geosynchronous satellite links, underground cables, aerial cables
Long line (telecommunications)
Long_line_(telecommunications)
Amateur radio verification database
by the American Radio Relay League (ARRL) to implement a contact verification service among amateur radio operators. Using LoTW, radio amateurs (hams)
Logbook_of_The_World
UK point-to-point microwave system
experiment had to be abandoned. The GPO built an experimental chain of radio relay stations for television, which used the relatively low VHF frequency
British Telecom microwave network
British_Telecom_microwave_network
Command and control aircraft by Boeing
to SAC's "Looking Glass" Airborne Command Post (ABNCP) as well as a radio relay link between the Looking Glass and ALCCs when airborne. Although equipped
Boeing_EC-135
Australian actress (1913–1970)
2023. Australasian Radio Relay League. (22 July 1938), "THE QUEEN'S NECKLACE", The Wireless Weekly: The Hundred per Cent Australian Radio Journal, Sydney:
Gwen_Munro
Spoken alphabet for radio communication
(using the spelling "Xray"), the International Amateur Radio Union (IARU), the American Radio Relay League (ARRL), the Association of Public-Safety Communications
NATO_phonetic_alphabet
Military unit
The 125th Special Tactics Squadron is a special operations force unit serving as part of the 142nd Wing of the United States Air National Guard. It is
125th Special Tactics Squadron
125th_Special_Tactics_Squadron
Omani island
a fish factory, as well as a few small towns. Previously, the BBC had a relay facility consisting of both HF and MF broadcasting transmitters stationed
Masirah_Island
Soviet state radio broadcasting network
system for meter-wave radio relay links, "Crab," was created in the experimental workshops of the Research Institute of Radio Engineering in 1953-1954
Radio_in_the_Soviet_Union
Geocode system used by radio amateurs
digits, and two more letters. To give an example, W1AW, the American Radio Relay League's Hiram Percy Maxim Memorial Station in Newington, Connecticut
Maidenhead_Locator_System
Australian actor (1917–1971)
Relay League., The Wireless Weekly: The Hundred per Cent Australian Radio Journal, Wireless Press, retrieved 24 March 2019 Australasian Radio Relay League
Grant_Taylor_(actor)
Radio Relay Site in Şahinyurdu Detachment 14, HQ, 2003rd CG, at Yamanlar Radio Relay Site in Yamanlar Detachment 16, HQ, 2003rd CG, at Elmadag Radio Relay
Outline of the U.S. Air Force in Europe at the end of the Cold War
Outline_of_the_U.S._Air_Force_in_Europe_at_the_end_of_the_Cold_War
Military unit
airmen, the 223rd had a mission to install and operate five radio relay stations and three radio terminals under field conditions. First Lt. Joe A. Holbrook
223rd Cyberspace Operations Squadron
223rd_Cyberspace_Operations_Squadron
Objects intentionally placed into orbit
lightweight and robust as possible. Most communication satellites are radio relay stations in orbit and carry dozens of transponders, each with a bandwidth
Satellite
Electromagnetic spectrum, 3 Hz – 3000 GHz
The radio spectrum is the part of the electromagnetic spectrum with frequencies from 3 Hz to 3,000 GHz (3 THz). Electromagnetic waves in this frequency
Radio_spectrum
Australian actor (1918–2005)
Radio Relay League, The Wireless Weekly: The Hundred per Cent Australian Radio Journal, Wireless Press, retrieved 24 March 2019 Australasian Radio Relay League
Ron_Randell
Telecommunications network for TV programming
century, cross-country microwave radio relays were replaced by fixed-service satellites. Some terrestrial radio relays remained in service for regional
Television_broadcaster
an organized network of amateur radio operators sponsored by the American Radio Relay League for the purpose of relaying messages throughout the U.S. and
National_Traffic_System
Chinese radio communication company
Kenwood, Icom, and Yaesu. In 2025, the American Radio Relay League, the main organizing body for Amateur Radio in the United States, even published a book
Baofeng_(company)
Organization
communications. It is organized and sponsored by the American Radio Relay League (ARRL) and the Radio Amateurs of Canada (RAC). Communication failures have been
Amateur Radio Emergency Service
Amateur_Radio_Emergency_Service
Exchange of information between amateur radio stations
they have worked. Computer-based logging software, such as the American Radio Relay League's Logbook of the World, can also be used for logging contacts
Contact_(amateur_radio)
Electrically operated switch
A relay is an electrically operated switch. It has a set of input terminals for one or more control signals, and a set of operating contact terminals
Relay
Electromagnetic radiation with wavelengths from 1 m to 1 mm
microwave radio relay networks, radar, satellite and spacecraft communication, medical diathermy and cancer treatment, remote sensing, radio astronomy
Microwave
Licensing of amateur radio in the US
privately held company, and one sponsored by the non-profit American Radio Relay League (ARRL)[citation needed][according to whom?]. The ARRL VEC coordinates
Amateur radio licensing in the United States
Amateur_radio_licensing_in_the_United_States
Specialized communication forces of the Soviet Ministry of Defense
battalions of various types (radio, tropospheric communications, long–distance communications, radio relay, radio relay cable, underground cable, line
Communication Troops of the Ministry of Defense of the Soviet Union
Communication_Troops_of_the_Ministry_of_Defense_of_the_Soviet_Union
Hill in Delaware, United States
self-supporting radio tower just south of the benchmark was constructed in 1947 by Western Union as part of a historic C-band microwave radio relay system that
Ebright_Azimuth
Communication connection between two nodes or endpoints
of point-to-point communications links are leased lines and microwave radio relay. The term is also used in computer networking and computer architecture
Point-to-point (telecommunications)
Point-to-point_(telecommunications)
American Radio Relay League. The term "Young Lady" derives from a Morse code abbreviation, YL, that is used to refer to female amateur radio operators
Young_Ladies_Radio_League
Emergency radio service organization
from the American Radio Relay League and the Department of the Army's Office of Civil Defense. During World War II, the Amateur Radio Service had been
Radio Amateur Civil Emergency Service
Radio_Amateur_Civil_Emergency_Service
Non-profit organisation
Radio League (SARL), formerly the South African Radio Relay League (SARRL), is a non-profit organisation representing the interests of amateur radio enthusiasts
South_African_Radio_League
Amateur radio station in the United States
W1AW is both the amateur radio call sign and the primary operating station of the American Radio Relay League (ARRL). This station, which is commonly
W1AW
Amateur radio magazine
QST is a magazine for amateur radio enthusiasts, published by the American Radio Relay League (ARRL). It is a membership journal that is included with
QST
Amateur radio "expedition"
Newington, CT: The American Radio Relay League: 63. July 2002. ISSN 0033-4812. "DXCC Rules". Newington, CT: American Radio Relay League. July 2011. Retrieved
DX-pedition
Graphical system analysis method
July 2008. American Radio Relay League (ARRL) (2005), ARRL Handbook for Radio Communications (Eighty-Third ed.), Amateur Radio Relay League, ISBN 0-87259-948-5
Block_diagram
US Reconnaissance Project formed during the Vietnam War
support units, the FACs lived alongside the Delta units they worked with. Radio relay was initially handled by Vietnamese Air Force C-47 but was switched,
Project_DELTA
1997 nonfiction book by Jon Krakauer
feasible a coordinated rescue would have been without radio-relay (since Boukreev was without a radio, when he returned to camp). Boukreev provided a rebuttal
Into_Thin_Air
Telecommunications device
American Radio Relay League. p. 7:4. ISBN 978-0-87259-098-4. Hall, Jerry; et al., eds. (1988). ARRL Antenna Book. Newington, CT: American Radio Relay League
Antenna_tuner
Jersey Radio Association (SJRA) is an amateur radio organization. First organized June 12, 1916 and affiliated with the American Radio Relay League since
South Jersey Radio Association
South_Jersey_Radio_Association
Amateur radio hobby involving vintage radio equipment
November 2019. "What is Ham Radio? 1.5.8 Vintage Radio". The ARRL Handbook For Radio Communications (91st ed.). American Radio Relay League. 2014. p. 1.17.
Vintage_amateur_radio
International confederation of organizations for amateur radio operators
American Radio Relay League and the Radio Society of Great Britain are full member societies of IARU Region 3. The ARRL represents amateur radio operators
International Amateur Radio Union
International_Amateur_Radio_Union
Amateur radio frequency band
cited]". QST Magazine. American Radio Relay League. p. 62. "New ham bands spring to life". Newington, CT: American Radio Relay League. Retrieved 22 October
630-meter_band
Amateur radio history
Silver. The ARRL Ham Radio License Manual: All You Need to Become an Amateur Radio Operator. Technician]. Level 1. American Radio Relay League; 2006. ISBN 978-0-87259-963-5
History_of_amateur_radio
Radio telecommunication tower
platforms in same distances, populated with high-gain directional microwave radio relay antennas ("parabolic mirrors"). Number nine was added at 25 m height
Heinrich_Hertz_Tower
Amateur radio transmission confirmation card
data on the early QSLs SWL QSL Museum American Radio Relay League Logbook of the World American Radio Relay League QSL Buruea A very large QSL gallery, more
QSL_card
Type of radio frequency connector
American Radio Relay League. ISBN 978-0-8725-9478-4. Henney, Keith (1941). "Section 15 – High frequency transmission and reception". Radio Engineering
UHF_connector
Fallback service
the American Radio Relay League (ARRL); Radio Relay International, which provides radio operator certification and organizes radio networks and volunteers
Amateur radio emergency communications
Amateur_radio_emergency_communications
microwave radio relay stations, used for police, fire service and amateur radio relays as well as Bundeswehr communications. The 70 cm amateur radio relay station
Köterberg
Tower in Cologne
cafeteria, viewing platform, and a restaurant, apart from antennas for radio relay and radio services within the VHF range. Because of a missing leaseholder
Colonius
US Air Force light bomber in service 1956-1973
aircraft's use in signals intelligence, electronic countermeasures, radio relay, and weather reconnaissance operations. Aircraft were commonly forward
Douglas_B-66_Destroyer
Topics referred to by the same term
another Microwave radio relay Relay channel, in information theory, a communications probability modeling system Telecommunications Relay Service, a telephone
Relay_(disambiguation)
Term used in telecommunication
established. In radio-relay systems, equipment used at points where data are inserted or derived, as distinct from equipment used only to relay a reconstituted
Terminal_equipment
Amateur radio award
Humanitarian Award is an award by the American Radio Relay League given to amateurs who, through Amateur Radio, are devoted to promoting the Welfare of mankind
ARRL International Humanitarian Award
ARRL_International_Humanitarian_Award
Telecommunication tower in Bavaria, Germany
mechanisms for Frequency modulation, DAB, UMTS, pager, amateur radio and a microwave radio relay link and – closed since 1991 – a rotating restaurant and a
Fernmeldeturm_Nürnberg
American inventor
17, 1936) was an American radio pioneer and inventor, and co-founder (with Clarence D. Tuska) of the American Radio Relay League (ARRL). Hiram Percy
Hiram_Percy_Maxim
multichannel UHF and SHF radio relay links that carry voice, data, telegraph and facsimile communications. The Single Channel Radio Access subsystem is effectively
Communications and information systems of the British Armed Forces
Communications_and_information_systems_of_the_British_Armed_Forces
Comics character
poison. Mr. Tho - The owner of radio relay stations who the Nazis swayed to their side and forced to bomb his own radio relay stations. Paul Smythe - A department
Whizzer_(Robert_Frank)
National association for Amateur Radio in Canada
American Radio Relay League.[citation needed] 1993 — The Canadian Radio Relay League and Canadian Amateur Radio Federation merge to form Radio Amateurs
Radio_Amateurs_of_Canada
Uninhabited subantarctic volcanic island
3Y5X Story". Radio Communication. pp. 12–13, 61. Retrieved 24 February 2024. "Bouvet Island DXpedition is On the Air!". American Radio Relay League. Retrieved
Bouvet_Island
United States & Canadian telephone number for emergencies
radio logs, field interviews, client information, schedules, etc.). A dispatcher may announce the call details to field units over a two-way radio. Some
911 (emergency telephone number)
911_(emergency_telephone_number)
are defined by CIA World Factbook as "adequate as are the microwave radio relay connections to outlying areas of the country." Domestic: Djibouti Telecom
Telecommunications in Djibouti
Telecommunications_in_Djibouti
Mountain in Vietnam
held by American forces with the 121st Signal Battalion establishing a radio relay station, callsign Granite Romeo Tango, there in February 1966. Supplied
Black_Virgin_Mountain
bimonthly magazine published by the American Radio Relay League. The magazine covers topics related to amateur radio and radiocommunication experimentation
QEX
Soviet and Russian shortwave radio station
Radio Enigma". Wired. Retrieved 16 November 2020. McLellan, Allison (November 2019). "Decoding Numbers Stations". QST. 103 (11). American Radio Relay
UVB-76
Type of Morse code operating signal
casual amateur radio communications. Selected Q-codes were soon adopted by amateur radio operators. In December 1915, the American Radio Relay League began
Q_code
connected by modern networks of fiber-optic cable, coaxial cable, microwave radio relay, and a domestic satellite system; cellular telephone service is widely
Telecommunications_in_France
Words traditionally disallowed in U.S. broadcast radio and television
unsuitable for broadcast on the public airwaves in the United States, whether radio or television. As such, they were avoided in scripted material and bleep
Seven_dirty_words
Operator of radio waves
to encourage youth participation in amateur radio, such as the American Radio Relay League's Amateur Radio Education and Technology Program. The World
Amateur_radio_operator
Soviet radar station in Murmansk
(3.7 mi) to the south east there was a military tropospheric scatter radio relay station. Olenegorsk was the site of one of the first two early warning
Olenegorsk_Radar_Station
Electronic filter
QST. American Radio Relay League: 24–25, 86–88. Davis, W. S. (October 1939). "Crystal Filter for 'Phone Work". QST. American Radio Relay League: 61. Weaver
Crystal_filter
Wooden telecommunications tower in Germany
The Rottenbuch Radio Tower is a transmitting tower of the Vodafone company, sited between Peiting and Rottenbuch in southern Bavaria, Germany. The first
Rottenbuch_Radio_Tower
Letter in several Latin-script alphabets
of International Call Sign Series". arrl.org. Newington, CT: American Radio Relay League. Sandersen, Vibeke (2000). "Om bogstavet ø". Nyt fra Sprognævnet
Ø
Telecommunication device that obscures signals
descrambler at the receiving side. Scrambling is widely used in satellite, radio relay communications and PSTN modems. A scrambler can be placed just before
Scrambler
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