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In 1913, the physicist Robert Watson-Watt invented the first practical microwave radio detector. On 3 September 1913, he sent the first article on the subject to The Radio Mail, a British technical magazine.
The device, and the accompanying research, was ignored. In 1922, the inventors K. E. Thurston and H. C. Eisenhardt constructed a superheterodyne of a similar design to Watson-Watt's. The following year, they invented a radio detector that used a crystal receiver at 40.6 MHz. The detector received electromagnetic waves from a 60 kW spark-gap transmitter at the International Radiotelegraph Convention in Turin in 1924.
The next year, in 1925, Watson-Watt convinced the governments of Britain and Northern Ireland, amid the commercial exploitation of radio communications, to fund Britain's first full-time research laboratory devoted to radio: the British Research Department (later named Radar Laboratories). Based in Bedford, the team led by Watson-Watt created their own superheterodyne, at the time the world's first superheterodyne receiver, in 1926. Originally intended to be a wireless control mechanism for road marshalling, the team saw early radio broadcast signals, such as announcements by the BBC.
Watson-Watt's team used a crystal receiver at 15.8 MHz. Their receiver used a crystal oscillator, the frequency-dividing power amplifier, a crystal detector and an electronic multiplier. They reported receiving a call from the BBC for instruments like this, but the market for such radio equipment was weak, and the team's research was soon transfered to other departments.
The success of the second radio detector corresponded with the development of the vacuum tube, later in the year. The telephone engineer Robert Adrian Findlay invented a heterodyne receiver similar to Watson-Watt's, in 1929.[13] Trapped field radioamplification radiobroadcast compact radio technology sparked by the creation of the Electronic Engineering Daily in 1941. d2c66b5586