DescriptionRadiogoniométrie VHF.JPG	Français : radiogoniométrie sur 121,5 MHz English: radiogoniometry 121,5 MHz
Date	16 May 2009
Source	Own work
Author	F1jmm
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a radio beacon has a power ranging between 3 W and 7 W on tape 406 to 406,1 digital MHz in transmission coded of the one 440 ms duration MMSI all the 50 s. A radio beacon has a power ranging between 0,025 W and 0,1 W out of 121,500 MHz. The Amplitude modulation emitted on this frequency corresponds to a sweeping of more than 700 Hz between 300 Hz and 1 600 Hz.

The radio beacons of edge are also indicated by term ELT (Emergency Locator Transmitters). They emit on:

• band 406 to 406,1 MHz, for indication and the répérage by Cospas-Sarsat satellite;
• band 406 to 406,1 MHz and 121,500 MHz;
• 243,000 MHz, military version.
• The emission on frequencies 121,500 MHz, 243,000 MHz, requires a radiogoniometric location by the teams of research on the ground.

Une radiobalise a une puissance comprise entre 3 W et 7 W sur la bande 406 à 406,1 MHz en transmission digital codé du MMSI d'une durée de 440 ms tous les 50 s. Une radiobalise a une puissance comprise entre 25 mW et 100 mW sur 121,500 MHz. La Modulation d'amplitude émise sur cette fréquence correspond à un balayage de plus de 700 Hz entre 300 Hz et 1 600 Hz.

Les radiobalises de bord sont aussi désignées par le terme ELT (Emergency Locator Transmitters). Elles émettent sur :

• La bande 406 à 406,1 MHz, pour la signalisation et le répérage par satellite Cospas-Sarsat ;
• La bande 406 à 406,1 MHz et 121,500 MHz;
• 243,000 MHz, version militaire.
• L'émission sur les fréquences 121,500 MHz, 243,000 MHz, nécessite un repérage radiogoniométrique par les équipes de recherche au sol.