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A second type of spark gap that had a similar quenching effect [15] was the "rotary gap", invented by Tesla in 1896 [92] [93] and applied to radio transmitters by Reginald Fessenden and others. [ 17 ] : p.359–362 [ 79 ] It consisted of multiple electrodes equally spaced around a disk rotor spun at high speed by a motor, which created sparks ...
Nowadays, this is usually regarded as illegal radio frequency interference and is suppressed, but in the early days of radio communications (1880–1920), this was the means by which radio signals were transmitted, in the unmodulated spark-gap transmitter. Many radio spark gaps include cooling devices, such as the rotary gap and heat sinks ...
The transmitter was replaced with a 100 kW quenched-spark transmitter, the most powerful transmitter in the world at the time. [5] The omnidirectional umbrella antenna was replaced by a 1,037-meter (3,402 ft) long directional flattop antenna consisting of 20 parallel horizontal wires supported by five 120-meter (390 ft) towers, pointed at ...
The Alexanderson alternator followed Fessenden's rotary spark-gap transmitter as the second radio transmitter to be modulated to carry the human voice. Until the invention of vacuum-tube (valve) oscillators in 1913 such as the Armstrong oscillator , the Alexanderson alternator was an important high-power radio transmitter , and allowed ...
This new, more-refined method for generating continuous-wave radio signals was initially developed by Danish inventor Valdemar Poulsen.The spark-gap transmitters in use at that time produced damped wave which wasted a large portion of their radiated power transmitting strong harmonics on multiple frequencies that filled the RF spectrum with interference.
The plan was to conduct the transatlantic service using Fessenden-designed rotary spark-gap transmitters. A 420-foot (128 meter) guyed antenna was constructed at Brant Rock, with a similar tower erected at Machrihanish in western Scotland. In January 1906, these stations made the first successful two-way transmission across the Atlantic ...
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One minor use of the coherer in modern times was by Japanese 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, called Radicon (abbreviation for Radio-Controlled) toys. Several different types using the same RC system were commercially ...
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