121.5

The Artex C406-N is a single output emergency locator transmitter (ELT) that contains the latitude/longitude information from the aircraft navigation system. Following long message protocol, the 406 MHz transmitter turns on and transmits an encoded digital message to the Cospas/Sarsat satellite system every 50 seconds for 520 milliseconds. During a crash, the ELT automatically activates and transmits the standard swept tone on 121.5 and 243.0 MHz.