 |
Current mood:  awake Category: Music
Oracle 4
Radio navigation.
The first system of radio navigation was the Radio Direction Finder, or RDF. By tuning in a radio station and then using a directional antenna to find the direction to the broadcasting antenna, radio sources replaced the stars and planets of celestial navigation with a system that could be used in all weather and times of day. By using triangulation, two such measurements can be plotted on a map where their intersection is the position. Commercial AM radio stations can be used for this task due to their long range and high power, but strings of low-power radio beacons were also set up specifically for this task. Early systems used a loop antenna that was rotated by hand to find the angle to the signal, while modern systems use a much more directional solenoid that is rotated rapidly by a motor, with electronics calculating the angle. These later systems were also called Automatic Direction Finders, or ADF.
Quest search word: Frequency and Volume - Rafael Lozano-Hemmer (Barbican, London)
Quest search engine: Youtube
4:02 PM
Powered by  | | English | | Albanian | | Arabic | | Bulgarian | | Catalan | | Chinese | | Croatian | | Czech | | Danish | | Dutch | | Estonian | | Filipino | | Finnish | | French | | Galician | | German | | Greek | | Hebrew | | Hindi | | Hungarian | | Indonesian | | Italian | | Japanese | | Korean | | Latvian | | Lithuanian | | Maltese | | Norwegian | | Polish | | Portuguese | | Romanian | | Russian | | Serbian | | Slovak | | Slovenian | | Spanish | | Swedish | | Thai | | Turkish | | Ukrainian | | Vietnamese |
|