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Qu'est-ce (qui) est QN Signals - définition
QN Signals
MORSE CODE OPERATING SIGNAL FOR AMATEUR RADIO MESSAGES
The QN Signals are Morse code operating signals that were introduced for Amateur radio net operation in 1939 on the Michigan QMN Net to lighten the burdens of net control operators. Originally created by a committee of the Detroit Amateur Radio Association led by Ralph Thetreat, W8FX.
qn.
WIKIMEDIA DISAMBIGUATION PAGE
Qn; Q.N.; Q.n.; Qn.; QN (disambiguation); Q N
Quotation
Railway semaphore signal
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![Lower quadrant stop signals at [[St. Erth]] in 2007](https://commons.wikimedia.org/wiki/Special:FilePath/Lower Signal 1.jpg?width=200 "Lower quadrant stop signals at [[St. Erth]] in 2007")
![Signals on the [[River Weaver]] Navigation, directing boats into the paired locks](https://commons.wikimedia.org/wiki/Special:FilePath/Northwich-weaver-navigation-hunts-lock-signals.jpg?width=200 "Signals on the [[River Weaver]] Navigation, directing boats into the paired locks")
![Semaphore signal levers inside train dispatcher's room of [[Cianjur railway station]]. These levers are connected to the signal by pairs of wires.](https://commons.wikimedia.org/wiki/Special:FilePath/Railway semaphore signal levers in Cianjur Station.jpg?width=200 "Semaphore signal levers inside train dispatcher's room of [[Cianjur railway station]]. These levers are connected to the signal by pairs of wires.")
![German semaphore distant (left) and home (right) signal exhibition in [[Steinfurt]], Germany.](https://commons.wikimedia.org/wiki/Special:FilePath/Railway signal set exhibited in Steinfurt.jpg?width=200 "German semaphore distant (left) and home (right) signal exhibition in [[Steinfurt]], Germany.")
![Somersault signals at [[Carrickfergus railway station]], showing the distinctive central pivot about which the arm "somersaults"](https://commons.wikimedia.org/wiki/Special:FilePath/Somersault signal.jpg?width=200 "Somersault signals at [[Carrickfergus railway station]], showing the distinctive central pivot about which the arm \"somersaults\"")
![Santa Fe Railroad]], 1943. The vertical position indicates a "clear" aspect.](https://commons.wikimedia.org/wiki/Special:FilePath/West bound Santa Fe RR freight train waiting in a siding to meet an east bound train, Ricardo, New Mexico.jpg?width=200 "Santa Fe Railroad]], 1943. The vertical position indicates a \"clear\" aspect.")
FORM OF FIXED RAILWAY SIGNAL
Semaphore signal; Semaphore signals; Upper quadrant signal
Railway semaphore signal is one of the earliest forms of fixed railway signals. This semaphore system involves signals that display their different indications to train drivers by changing the angle of inclination of a pivoted 'arm'.
