About: Bellini–Tosi direction finder

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A Bellini–Tosi direction finder (B–T or BTDF) is a type of radio direction finder (RDF), which determines the direction to, or bearing of, a radio transmitter. Earlier RDF systems used very large rotating loop antennas, which the B–T system replaced with two fixed antennae and a small rotating loop, known as a radiogoniometer. This made RDF much more practical, especially on large vehicles like ships or when using very long wavelengths that demand large antennae.

Attributes	Values
rdfs:label	Bellini–Tosi direction finder (en)
rdfs:comment	A Bellini–Tosi direction finder (B–T or BTDF) is a type of radio direction finder (RDF), which determines the direction to, or bearing of, a radio transmitter. Earlier RDF systems used very large rotating loop antennas, which the B–T system replaced with two fixed antennae and a small rotating loop, known as a radiogoniometer. This made RDF much more practical, especially on large vehicles like ships or when using very long wavelengths that demand large antennae. (en)
foaf:depiction
dcterms:subject	Radio direction finding
Wikipage page ID	43325756 (xsd:integer)
Wikipage revision ID	1122819287 (xsd:integer)
Link from a Wikipage to another Wikipage	Radio direction finding Bearing (navigation) Antenna factor Horizon USS Wyoming (BB-32) US Navy Kurier system Lighthouse Signals intelligence Melbourne Electron Morse code Antenna (radio) Loop antenna MacRobertson Air Race Shortwave Phase (waves) Australia AM radio Air navigation Faraday's law of induction Amateur radio operators Microcontroller Radio direction finder Heinrich Hertz Ionosphere Marconi Triode Charleville, Queensland Supermarine Spitfire High-frequency direction finding High frequency Zeppelin Skywave Automatic direction finder Marconi Company Great circle route ITT Corporation Inductance Officer (armed forces) Capacitance RMS Mauretania (1906) World War II Longwave Medium wave Solenoid Very high frequency Cathode-ray tube Ground wave propagation Half-wave dipole Kurzsignale code system Pseudo-doppler direction finder Huff-duff Radiogoniometer dbr:Burst_encoding dbr:Doppler_direction_finder
Link from a Wikipage to an external page	http://www.jumpjet.info/Pioneering-Wireless/eBooks/maturity/1922c.pdf https://babel.hathitrust.org/cgi/pt%3Fid=uiug.30112064674325;view=1up;seq=294 http://www.virhistory.com/navy/manuals/10232a/ctm-10232a-18.pdf https://books.google.com/books%3Fid=SYFTAQAAQBAJ https://books.google.com/books%3Fid=amc1AKYr4LgC&pg=PA188 https://books.google.com/books%3Fid=giYDAAAAMBAJ&pg=PA451
sameAs	Bellini–Tosi direction finder Bellini–Tosi direction finder Bellini–Tosi direction finder
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thumbnail	wiki-commons:Special:FilePath/Radiogoniometer_RN_S25_internal_workings.jpg?width=300
has abstract	A Bellini–Tosi direction finder (B–T or BTDF) is a type of radio direction finder (RDF), which determines the direction to, or bearing of, a radio transmitter. Earlier RDF systems used very large rotating loop antennas, which the B–T system replaced with two fixed antennae and a small rotating loop, known as a radiogoniometer. This made RDF much more practical, especially on large vehicles like ships or when using very long wavelengths that demand large antennae. BTDF was invented by a pair of Italian officers in the early 1900s, and is sometimes known as a Marconi–Bellini–Tosi after they joined forces with the Marconi Company in 1912. BTDF was the most prevalent form of naval direction finding from the 1920s to well into the 1980s, and was used as a major part of early long-distance air navigation systems from the 1930s until after World War II. BTDF systems were also widely used for military signals intelligence gathering. During the war, new techniques like huff-duff began to replace radiogoniometers in the intelligence gathering role, reducing the time needed to take an accurate fix from minutes to seconds. The ability to inexpensively process radio signals using microcontrollers allowed pseudo-doppler direction finders to take over most of the radiogoniometer's remaining roles from the 1980s. In spite of seeing little use today, the original antennae of BTDF systems can still be seen on many ships and boats. (en)
gold:hypernym	Finder
prov:wasDerivedFrom	wikipedia-en:Bellini–Tosi_direction_finder?oldid=1122819287&ns=0
page length (characters) of wiki page	26641 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:Bellini–Tosi_direction_finder
is Link from a Wikipage to another Wikipage of	Bellini-Tosi direction finder Goniometer Goniometer (disambiguation) High-frequency direction finding Inductor VP-20 Belini-Tosi goniometer

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