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- Low-frequency_radio_range abstract "The low-frequency radio range (LFR), also known as the four-course radio range, LF/MF four-course radio range, A-N radio range, Adcock radio range, or commonly "the range", was the main navigation system used by aircraft for instrument flying in the 1930s and 1940s, until the advent of the VHF omnidirectional range (VOR), beginning in the late 1940s. It was used for en route navigation as well as instrument approaches and holds.Based on a network of radio towers which transmitted directional radio signals, the LFR defined specific airways in the sky. Pilots navigated the LFR by listening to a stream of automated "A" and "N" Morse codes. For example, they would turn the aircraft to the right when hearing an "N" stream ("dah-dit, dah-dit, ..."), to the left when hearing an "A" stream ("di-dah, di-dah, ..."), and fly straight ahead while hearing a steady tone.As the VOR system was phased in around the world, the LFR was gradually phased out, mostly disappearing by the 1970s. There are no remaining operational LFR facilities today. At its maximum deployment, there were nearly 400 LFR stations in the U.S. alone.".
- Low-frequency_radio_range thumbnail A-N-signals.png?width=300.
- Low-frequency_radio_range wikiPageExternalLink RNGAPPYVP.jpg.
- Low-frequency_radio_range wikiPageExternalLink adcock-range.html.
- Low-frequency_radio_range wikiPageExternalLink watch?v=p-VqtNY8vpw.
- Low-frequency_radio_range wikiPageID "23697364".
- Low-frequency_radio_range wikiPageRevisionID "604400443".
- Low-frequency_radio_range description "A+N intersection".
- Low-frequency_radio_range description "Inside A quadrant".
- Low-frequency_radio_range description "Inside N quadrant".
- Low-frequency_radio_range description "Slightly off beam in A".
- Low-frequency_radio_range filename "Lfr-a+n.ogg".
- Low-frequency_radio_range filename "Lfr-a-.ogg".
- Low-frequency_radio_range filename "Lfr-a.ogg".
- Low-frequency_radio_range filename "Lfr-n.ogg".
- Low-frequency_radio_range hasPhotoCollection Low-frequency_radio_range.
- Low-frequency_radio_range help "no".
- Low-frequency_radio_range pos "left".
- Low-frequency_radio_range title ""Distinct" A".
- Low-frequency_radio_range title ""Distinct" N".
- Low-frequency_radio_range title ""On the beam"".
- Low-frequency_radio_range title ""Twilight" A".
- Low-frequency_radio_range type "sound".
- Low-frequency_radio_range subject Category:Radio_navigation.
- Low-frequency_radio_range comment "The low-frequency radio range (LFR), also known as the four-course radio range, LF/MF four-course radio range, A-N radio range, Adcock radio range, or commonly "the range", was the main navigation system used by aircraft for instrument flying in the 1930s and 1940s, until the advent of the VHF omnidirectional range (VOR), beginning in the late 1940s.".
- Low-frequency_radio_range label "Low-frequency radio range".
- Low-frequency_radio_range sameAs m.06zr0d6.
- Low-frequency_radio_range sameAs Q17164721.
- Low-frequency_radio_range sameAs Q17164721.
- Low-frequency_radio_range wasDerivedFrom Low-frequency_radio_range?oldid=604400443.
- Low-frequency_radio_range depiction A-N-signals.png.
- Low-frequency_radio_range isPrimaryTopicOf Low-frequency_radio_range.