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Type of radio transmitter
A spark-gap transmitter is an obsolete type of radio transmitter which generates radio waves by means of an electric spark. Spark-gap transmitters were
Spark-gap_transmitter
Two conducting electrodes separated in order to allow an electric spark to pass between
unmodulated spark-gap transmitter. Many radio spark gaps include cooling devices, such as the rotary gap and heat sinks, since the spark gap becomes quite
Spark_gap
Electronic device that emits radio waves
in 1895–1897 High power spark gap radiotelegraphy transmitter in Australia around 1910. 1 MW US Navy Poulsen arc transmitter which generated continuous
Transmitter
Abrupt electrical discharge through an ionised channel
ignition device from sparking after the flame is lit or restart the flame if it goes out. A spark-gap transmitter uses an electric spark gap to generate radio
Electric_spark
Canadian-American electrical engineer and inventor (1866–1932)
conclusion that he could develop a far more efficient system than the spark-gap transmitter and coherer-receiver combination which had been created by Oliver
Reginald_Fessenden
conclusion that he could develop a far more efficient system than the spark-gap transmitter and coherer receiver combination. To this end he worked on developing
History_of_radio
Electrical resonant transformer circuit
capacitor, spark gap, and air core "oscillation transformer". From Tesla's time until the 1930s Tesla coils were widely used in radio transmitters, quack
History_of_the_Tesla_coil
side of the spark gap was directly connected to the antenna. Receivers with thermionic valves became commonplace before spark-gap transmitters were replaced
Timeline_of_radio
Type of spark gap modulation
method of radio transmission produced by the first radio transmitters (spark gap transmitters) which consisted of a series of damped radio waves. Information
Damped wave (radio transmission)
Damped_wave_(radio_transmission)
Oldest continuously operating radio transmitting installation in the world
radio transmitter. Trial service was initiated on 9 August 1906, and operational service began on 16 August 1906 using a 25 kW spark gap transmitter designed
Nauen_Transmitter_Station
Use of radio waves for communication
theory, first observed radio waves he generated using a primitive spark-gap transmitter. Experiments by Hertz and physicists Jagadish Chandra Bose, Oliver
Radio
Very low energy, short range radio precise positioning
Pulse-position modulation (PPM) Wi-Fi Direct Energy harvesting Spark-gap transmitter WiB (digital terrestrial television) USC Viterbi School of Engineering
Ultra-wideband
Operating signal for "request to communicate"
Company in 1904 for use in wireless telegraphy, at that time via spark-gap transmitters, and was adopted internationally at the London 1912 International
CQ_(call)
Device that controls current between electrodes
Although some applications had used earlier technologies such as the spark gap transmitter and crystal detector for radio or mechanical and electromechanical
Vacuum_tube
Early radio wave detector
tin-plate toy manufacturer Matsudaya Toy Co. who beginning 1957 used a spark-gap transmitter and coherer-based receiver in a range of radio-controlled (RC) toys
Coherer
Welsh wireless operator
rudimentary radio station consisting of a coherer-based receiver and a spark-gap transmitter, also powered by batteries charged from the mill wheel. He strung
Artie_Moore
Monopole antenna
mast erected in 1905 by Reginald Fessenden for his experimental spark gap transmitter at Brant Rock, Massachusetts with which he made the first two-way
Umbrella_antenna
High-frequency AC generator for radio transmission
were discovered in 1887, the first generation of radio transmitters, the spark gap transmitters, produced strings of damped waves, pulses of radio waves
Alexanderson_alternator
radio transmitters, used during the initial three decades of radio from 1887 to 1917, a period called the spark era, were spark gap transmitters which
History_of_radio_receivers
German physicist (1857–1894)
used a dipole antenna consisting of two collinear one-meter wires with a spark gap between their inner ends, and zinc spheres attached to the outer ends
Heinrich_Hertz
Topics referred to by the same term
expendable launch system SPARK, an autism research project by Simons Foundation Autism Research Initiative Spark-gap transmitter, a technology used to generate
Spark
Electrical resonant transformer circuit invented by Nikola Tesla
electrical energy. Tesla coil circuits were used commercially in spark-gap transmitters for wireless telegraphy until the 1920s, and in medical equipment
Tesla_coil
Transmission of information electromagnetically
While some applications had used earlier technologies such as the spark gap transmitter for radio or mechanical computers for computing, it was the invention
Telecommunications
experiment. The transmitting station in Poldhu, Cornwall used a spark-gap transmitter that could produce a signal in the medium frequency range and with
Invention_of_radio
Electronic method of transmitting information with a carrier wave
to send audio signals by radio waves. The first radio transmitters, called spark gap transmitters, transmitted information by wireless telegraphy, using
Amplitude_modulation
British passenger liner that sank in 1912
5-kilowatt rotary spark-gap transmitter, with the wireless telegraph call sign MGY, and communication was in Morse code. This transmitter was one of the
Titanic
Object detection system using radio waves
detecting distant lightning strikes. The next year, he added a spark-gap transmitter. In 1897, while testing this equipment for communicating between
Radar
British maritime communications company
to Selenia Marine in 2004 before ultimately dissolving in 2017. Spark-gap transmitter on board the SS Minnetonka, c. 1902 Marconi coastal station in Carnarvon
Marconi International Marine Communication Company
Marconi_International_Marine_Communication_Company
German physicist (1850–1918)
debated in the literature. Meanwhile, Braun attempted to replace the spark-gap transmitter, which produced damped oscillations, with AC generators that generated
K._Ferdinand_Braun
Branch of engineering
Hertz proved Maxwell's theory by transmitting radio waves with a spark-gap transmitter, and detected them by using simple electrical devices. Other physicists
Electrical_engineering
Non-commercial use of the radio spectrum
construction) and by operators engaged in low-power operation, as CW transmitters are simple to construct and weak signals can often be received by ear
Amateur_radio
Type of radio frequency antenna
radio transmitter is changed, the trap must be adjusted. At its base, the mast should have a lightning arrester consisting of a ball or horn spark gap between
Mast_radiator
as a coast guard marine radio station. As the original, powerful spark gap transmitters would create large quantities of electrical interference, stations
List of Marconi wireless stations
List_of_Marconi_wireless_stations
Method of communication by radio waves
different modulation methods during its history. The primitive spark-gap transmitters used until 1920 transmitted damped waves, which had very wide bandwidth
Wireless_telegraphy
Norwegian island in the Arctic Ocean
of the Island. The radio station consisted of a 3 kW Telefunken spark-gap transmitter and a 55 m (180 ft) wooden radio mast. Fearing a German occupation
Jan_Mayen
Combat involving electronics and directed energy
radio operator, hearing the presence of communications, used his Spark-gap transmitter to attempt to drown out the communications, allegedly leading the
Electronic_warfare
Ionized part of Earth's upper atmosphere
reception. The transmitting station in Poldhu, Cornwall, used a spark-gap transmitter to produce a signal with a frequency of approximately 500 kHz and
Ionosphere
Season of television series
conditions are recorded in a journal. Spark-Gap Transmitter: John C. proposes making a rudimentary transmitter that's similar to a telegraph. It will
The Colony (American TV series) season 1
The_Colony_(American_TV_series)_season_1
Early radio receiver component
telegraphy or "spark" era, primitive radio transmitters called spark gap transmitters were used, which generated radio waves by an electric spark. These transmitters
Crystal_detector
1978 book compiled and edited by Aleksandar Marinčić and Vojin Popović
Tesla envisaged a world wide communication system using a huge spark gap transmitter located in Colorado Springs in 1899. A few years later he built
Colorado Springs Notes, 1899–1900
Colorado_Springs_Notes,_1899–1900
Simple radio receiver circuit for AM reception
crystal sets received wireless telegraphy signals broadcast by spark-gap transmitters at frequencies as low as 20 kHz. A crystal radio can be thought
Crystal_radio
German physicist (1866–1938)
early radio transmitters, called spark gap transmitters, which used an electric spark to generate radio waves. In existing transmitters, the spark damped the
Max_Wien
Microwave antenna
could not travel beyond the horizon, and the low power microwave spark transmitters used had very short range. So the practical development of radio after
Lens_antenna
Place in Somerset County, New Jersey, United States
in Belmar, New Jersey. During World War I, the original Marconi spark-gap transmitter was replaced with an Alexanderson alternator, the invention of the
Somerset,_New_Jersey
American inventor
is now the ARRL Headquarters club station call sign. His rotary spark-gap transmitter "Old Betsy" has a place of honor at the ARRL Headquarters. The ARRL
Hiram_Percy_Maxim
Radio broadcasting using amplitude modulation
originally known as "Hertzian radiation" and "wireless telegraphy", used spark-gap transmitters that could only transmit the dots-and-dashes of Morse code. In October
AM_broadcasting
Physical phenomenon
the work of Heinrich Hertz, starting in 1887, in which he used a spark-gap transmitter to generate radio waves that he showed correspond to electrical
Self-oscillation
Norwegian maritime telecommunications company
spark-gap transmitter created interference with other American radio stations and was soon out of date. A new NOK 1.5-million vacuum tube transmitter
Telenor_Kystradio
German inventor, physicist and entrepreneur (1881–1957)
British technical magazine. The Telemobiloscope was primarily a spark-gap transmitter connected to an array of dipole antennas, and a coherer receiver
Christian_Hülsmeyer
American inventor (1873–1961)
signals. He traced its inspiration to 1900, when experimenting with a spark-gap transmitter, he briefly thought that the flickering of a nearby gas flame might
Lee_de_Forest
Type of transformer
first type of transformer. It was widely used in x-ray machines, spark-gap radio transmitters, arc lighting and quack medical electrotherapy devices from the
Induction_coil
Cable or conductor connecting a radio transmitter to an antenna
A radio transmitter or receiver is connected to an antenna which emits or receives the radio waves.[AI-retrieved source] The antenna feed system or antenna
Antenna_feed
Amateur radio transceiver
2.4 lb Output power: 5W internal battery, 10W external power source Transmitter modulation SSB: digital PSN modulation AM: digital low power modulation
ICOM_IC-705
Amateur radio communications software
Transmissions carry a station's callsign, Maidenhead grid locator, and transmitter power in dBm. The program can decode signals with a signal-to-noise ratio
WSPR_(amateur_radio_software)
United States historic place
building, the one that is preserved today, on the same site. The spark-gap transmitter operated at up to 2 kW power and was connected to an antenna tower
Massie_Wireless_Station
Early radio wave detector
help during its famous 15 April 1912 sinking. The primitive spark gap radio transmitters used during the first three decades of radio (1886-1916) could
Magnetic_detector
Amateur radio transceiver
(adjustable 5-100 watts) SSB/CW/FM (AM: 2 5W - adjustable 5-25 watts) Transmitter modulation SSB: digital phase-shift network (PSN) modulation AM: digital
ICOM_IC-7300
Overview of and topical guide to radio
Public radio History of radio Invention of radio Wireless telegraphy Spark-gap transmitter Alexanderson alternator Antique radio Coherer Continuous wave Crystal
Outline_of_radio
Town in Newfoundland and Labrador, Canada
operational atop a hill near the town of Fogo; operating with a spark-gap transmitter to establish maritime communications, the station was forced to
Fogo Island, Newfoundland and Labrador
Fogo_Island,_Newfoundland_and_Labrador
Electronic device for deceiving detection systems
interrupted wireless communication between Japanese battleships. The spark-gap transmitters in the Russian stations generated senseless noise while the Japanese
Electronic_countermeasure
Frequency shift keying digital mode
as those seen during low solar activity, high RF noise, or with low transmitter power. With advances in signal processing technology, software can decode
FT8
Two National Historic Sites in Cape Breton Island, Canada
was sent across the Atlantic Ocean to England from this site. A spark gap transmitter with 75 kilowatts of power fed four tall antennas on the 2-hectare
Marconi and Marconi Wireless Station National Historic Sites
Marconi_and_Marconi_Wireless_Station_National_Historic_Sites
Russian physicist (1859–1906)
telegraphy system based on "Hertzian" (radio) waves, developing a spark-gap transmitter and a much improved automatically reset coherer receiver. By mid-1895
Aleksandr_Popov_(physicist)
Electromagnetic wave that is not pulsed
damped wave signals produced by earlier spark gap type transmitters. Very early radio transmitters used a spark gap to produce radio-frequency oscillations
Continuous_wave
British merchant seaman (1877–1962)
code, the newly qualified Evans tapped out to the Titanic using a Spark-gap transmitter, "MGY [Titanic 's call sign]. MWL [Californian 's call sign]. I
Stanley_Lord
Part of early car ignition systems
used around the turn of the century to produce high voltage for spark-gap radio transmitters, x-ray machines, arc lights, and medical electrotherapy devices
Trembler_coil
Illegal or unregulated radio transmissions
technology, early radio enthusiasts used (electronically) noisy spark-gap transmitters. The Navy soon began complaining to a sympathetic press that amateurs
Pirate_radio
receive stations, he learned the Morse code, and soon built his own spark-gap transmitter, joining the ranks of amateur radio enthusiasts in the pre-license
Leo_C._Young
Variety of spark transmitter
called the arc transmitter, or Poulsen arc after Danish engineer Valdemar Poulsen who invented it in 1903, was a variety of spark transmitter used in early
Arc_converter
Amateur radio transceiver
it has a large detachable control head with a slanted display, so the transmitter can be installed elsewhere in a vehicle or home. The receiver used in
ICOM_IC-7100
Public radio station in Madison, Wisconsin
Electrical Engineering department professor Edward Bennett constructed a spark gap transmitter, which was only capable of transmitting the dots-and-dashes of Morse
WHA_(AM)
Conduction of electricity through an insulator under sufficiently high voltage
electrical power systems, and ignite fuel via spark plugs in internal combustion engines. Spark-gap transmitters were used in early radio telegraph systems
Electrical_breakdown
Sneaker wave Solitary wave Soliton Sonar Sonic anemometers Sound wave Spark-gap transmitter Spectroscopy Speed of gravity Speed of light Speed of sound Spike-and-wave
Index_of_wave_articles
wireless telegraphy were invented before 1900. These include the spark-gap transmitter and the coherer with early demonstrations and published findings
History of electronics engineering
History_of_electronics_engineering
Scientist, Educator and Entrepreneur born in Imperial Russia (1884–1962)
16 he began his own wireless experiments at home in Kyiv with a spark-gap transmitter and receiver but then formally went to study at the St Volodymyr
Simeon_Aisenstein
Society on his coherer lightning detector. In March 1896, he added a spark-gap transmitter and transmitted a Morse code message in a demonstration to the same
History_of_radar
Topics referred to by the same term
process of stopping an electrical arc, for example in a fuse or spark-gap transmitter in an internal combustion engine, the rapid cooling of fuel inside
Quench_(disambiguation)
Park in Ardross, Western Australia
Perth. When the station opened in 1912 it used a 25 kW quenched spark-gap transmitter manufactured by Telefunken, and a receiver with a locally built
Wireless_Hill_Park
American mathematician and inventor
current General bolometer, Lloyd Espenschied, Boston Navy Yard Radio spark gap transmitter, break key, wireless telegraph, antenna "Stone, John Stone". In
John_Stone_Stone
American inventor and pioneer in development of radio
communication after investigating a system for voice transmission by spark gap transmitter invented by Francis Joseph McCarty (1888-1906) in 1902. After demonstrating
Cyril_Frank_Elwell
Branch of the Finnish Army
battalion the next month. The Radio School was founded in May, and the Spark-gap transmitter Department in June. Message units were formed in three divisions
Signals (Finnish Defence Forces)
Signals_(Finnish_Defence_Forces)
Worldwide radio email messaging system that uses amateur-band radio frequencies
radio Transceivers Shortwave radio Beacons Winlink IBP ALE LM386 Spark-gap transmitter DX cluster Tropospheric scatter IRLP eQSO PLRI WIRES Emergency Field
Winlink
centimeter spark-gap transmitter and coherer. In 1906, he modified the system such that the receiver only responded to a certain transmitter signal. In
Radar_in_World_War_II
technology it was recognized that the signals emitted by transmitters had to be 'pure'. Spark-gap transmitters were outlawed once better technology was available
Radio_transmitter_design
German inventor (1876–1950)
the new continuous wave signals. The first type of radio transmitter, the spark-gap transmitter, produced strings of damped waves that were heard as a buzz
Rudolf_Goldschmidt
Danish engineer
it a generator of continuous radio waves, which, unlike earlier spark-gap transmitters, could be used for audio transmissions. The most important modification
Valdemar_Poulsen
radio waves, the spark-gap transmitter, was inadequate because it generated damped waves. Efforts were made to design a transmitter that would generate
Goldschmidt_alternator
Small radios carried to facilitate rescue in an emergency
sinking of the RMS Titanic in 1912. Lifeboats were equipped with spark gap transmitters such as the Marconi Type 241, c. 1920. These operated using Morse
Survival_radio
American electronics company (1919–1988)
Marconi transmitter site in New Brunswick, New Jersey. It proved to be superior for transatlantic transmissions to the spark-gap transmitters that had
RCA_Corporation
Signal processing technique
problems was building high power transmitters with the technology of the day. Early transmitters were spark gap transmitters. A mechanical device would make
Heterodyne
FCC rules and regulations on unlicensed transmissions
47 CFR 15.5 prohibits intentional damped wave transmissions such as spark-gap transmitters which were common before the 1920s but occupy a needlessly wide
Title_47_CFR_Part_15
Antique electrical device that stores a high-voltage electric charge
electrostatics experiments, and later in high-voltage equipment such as spark-gap radio transmitters and electrotherapy machines. Originally, the amount of capacitance
Leyden_jar
American inventor
fascinated Shoemaker conducted further experiments at his home, using a spark-gap transmitter, plus a coherer receiver of his own design, which used a galvanometer's
Harry_Shoemaker
farad is 9×108 jars and one jar is 1111 picofarads. With early spark-gap transmitters, changing the transmission frequency was most easily accomplished
Jar_(unit)
Space Shuttle thermal protection system Space tether missions Spark-gap transmitter Spark plasma sintering Spaser Spectral imaging Spectral line Spherical
List of plasma physics articles
List_of_plasma_physics_articles
Early radio receiver component
evaporate. Electronics portal Hot-wire barretter Coherer Crystal Radio Spark-gap transmitter Radio receiver Antique radio Camille Papin Tissot Sarkar, T. K.;
Electrolytic_detector
very limited in the UK. Among the items produced were amplifiers, spark-gap transmitters, aircraft compasses, high-voltage generators, bomb release apparatus
Frederick_G._Creed
1911 novel by Victor Appleton
working together, they are able to survive as Tom Swift builds a spark-gap transmitter radio from salvaged parts. Tom Swift used the older and more established
Tom Swift and His Wireless Message
Tom_Swift_and_His_Wireless_Message
Public radio station at the University of Iowa in Iowa City
Morse code transmitter in 1913. As of 1916, university electrical engineering students were operating a 2,000 watt spark gap transmitter at a 750-meter
WSUI
British telecommunications company
that time in the UK. Among the items produced were amplifiers, spark-gap transmitters, aircraft compasses, high-voltage generators, bomb release apparatus
Creed_&_Company
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