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Type 'C' Form 'A' twin detector crystal radio set, manufactured by British Thomson Houston Ltd. in 1924, kept at the Museum of the radio - Monteceneri (Switzerland) Early radio telegraphy used spark gap and arc transmitters as well as high-frequency alternators running at radio frequencies. The coherer was the first means of detecting a radio ...
Galena cat whisker detector used in early crystal radio Precision crystal detector with iron pyrite crystal, used in commercial wireless stations, 1914. The crystal is inside the metal capsule under the vertical needle (right). The leaf springs and thumbscrew allow fine adjustment of the pressure of the needle on the crystal.
Greenleaf Whittier Pickard (February 14, 1877 – January 8, 1956) was an American electrical engineer and inventor. He was largely responsible and most famous for the development of the crystal detector, the earliest type of diode detector, although he was not the earliest discoverer of the rectifying properties of contact between certain solid materials. [1]
In radio, a detector is a device or circuit that extracts information from a modulated radio frequency current or voltage. The term dates from the first three decades of radio (1888–1918). The term dates from the first three decades of radio (1888–1918).
Although the actual inventor of the hand-held metal detector is disputed, the hand-held metal detector was made in 1925 and was first patented by Dr. Gerhard Fisher in 1931. A metal detector had been invented some forty years earlier (1881) by Alexander Graham Bell for the sole purpose of locating a lead bullet in President James A. Garfield.
Codan Limited is a manufacturer and supplier of communications, metal detection, and mining technology, headquartered in Adelaide, South Australia with revenue of A$348.0 million (2020). [ 1 ] [ 2 ] Codan Limited is the communications business unit and the parent company of the Codan group, which is engaged in business through its operating ...
KHTW (1300 AM) is an American terrestrial radio station licensed to Lumberton, Texas, broadcasting a Conservative talk format. The facility signed on from Silsbee, Texas as KKAS on December 31, 1959. On January 31, 2000, the callsign was changed to KSET. In 2009, it moved to the new tower site in southwest Lumberton.
This group sold KOGT to Klement Broadcasting for $900,000 in 1982; the new owner, Richard Klement, was a real estate investor in Gainesville, Texas, and owner of that city's KGAF AM-FM. [9] Klement sold KOGT to G-Cap Communications, controlled by Gary P. Stelly, for $250,000 in 1992. [10] Stelly had previously worked at KOGT in college. [4]