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John Hays Hammond Jr. and Sr., 1922. John Hays Hammond Jr. (April 13, 1888 – February 12, 1965) was an American inventor known as "The Father of Radio Control".Hammond's pioneering developments in electronic remote control are the foundation for all modern radio remote control devices, including modern missile guidance systems, unmanned aerial vehicles (UAVs), and the unmanned combat aerial ...
Experiment to use human brain as a radio wave detector, 1902. The coherer's poor performance motivated a great deal of research to find better radio wave detectors, and many were invented. Some strange devices were tried; researchers experimented with using frog legs [24] and even a human brain [25] from a cadaver as detectors. [1] [26]
Experiment to use human brain as a radio wave detector, 1902. The coherer's poor performance motivated a great deal of research to find better radio wave detectors, and many were invented. Some strange devices were tried; researchers experimented with using frog legs [44] and even a human brain [45] from a cadaver as detectors. [22] [46]
The problem of band noise with tape devices is reduced dramatically by the invention of radio frequency bias of Walter Weber and Hans-Joachim von Braunmühl. 1942: The first all-electronic computer is used by John Vincent Atanasoff, but quickly fades into oblivion. Four years later the ENIAC completed – the beginning of the end of ...
The coherer was the most successful of many detector devices that were tried in the early days of radio. The operation of the coherer is based on the phenomenon of electrical contact resistance . Specifically as metal particles cohere (cling together), they conduct electricity much better after being subjected to radio frequency electricity.
Marconi used this device as a radio detector. [when?] The Supreme Court of the United States would eventually invalidate the US patent because of an improper disclaimer and, additionally, maintained the technology in the patent was known art when filed. [167] This invention was the first vacuum tube.
(Before that, the most common type of receiver was the crystal set, although some early radios used some type of amplification through electric current or battery.) Inventions of the triode amplifier, generator, and detector enabled audio radio. Westinghouse buys DeForest's and Armstrong's patent.
The crystal detector was the most successful of many detector devices invented during this era. The crystal detector evolved from an earlier device, [40] the first primitive radio wave detector, called a coherer, developed in 1890 by Édouard Branly and used in the first radio receivers in 1894–96 by Marconi and Oliver Lodge.