Contrôle de vitesse par balises (KVB)

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Contrôle de vitesse par balises (KVB)
NoWaterfallFiller.png
Frequencies 4.5 MHz
Frequency Range 4.5 MHz - 4.5 MHz
Mode USB
Modulation FSK
ACF
Emission Designator
Bandwidth 58 Hz
Location France, United Kingdom
Short Description "Speed control by beacons" railway safety system used in France and the Channel Tunnel line in the UK.
I/Q Raw Recording
Audio Sample

Contrôle de vitesse par balises (Speed control by beacons, abbreviated to KVB) is a railway safety system used in Mainland France and in the United Kingdom between London and the Channel Tunnel. The beacons themselves are placed trackside and store line information that is transmitted to the train as it passes over. A signal similar to the Eurobalise downlink is constantly transmitted from the train which energises the beacon, which will reply to the train using 50 kbaud FSKFrequency-Shift Keying with 58 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). shift. A '1' is 692 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). and a '0' is 750 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz)..

Frequencies[edit]

Clock downlink to beacon: 27.115 MHzMegaHertz (MHz) 10^6 Hz
Data uplink to train: 4.5 MHzMegaHertz (MHz) 10^6 Hz

Additional Links[edit]