Operated on the international distress frequency of 500 kHz.
2.
The pilot followed time-honored emergency procedures, he said, including broadcasting his intentions on the universal air distress frequency.
3.
Its patrol ships at sea and the communications center at Haulbowline maintain a 24-hour watch on all distress frequencies.
4.
Subsequent to the SOLAS ) conventions established the 500kHz maritime distress frequency monitoring and mandated that all passenger-carrying ships carry licensed radio telegraph operators.
5.
Those early beacons, designed for both manual and, in the event of a crash, automatic activation, were to broadcast their signals at 121.5 MHz-- the distress frequency long used by aviators.
6.
Those early beacons, designed for both manual and, in the event of a crash, automatic activation, were to broadcast their signals at 121 . 5 MHz-- the distress frequency long used by aviators.
7.
Beginning early in the 20th century ( Radio Act of 1912 ), the radio frequency of 500 kiloHertz ( 500 kHz ) was an international calling and distress frequency for Morse code maritime communication.
8.
The United States Coast Guard has ceased all use of Morse code on the radio, and no longer monitors any radio frequencies for Morse code transmissions, including the international medium frequency ( MF ) distress frequency of 500 kHz.
9.
Prior to the founding of Cospas-Sarsat, the civilian aviation community had already been using the 121.5 MHz frequency for distress, while the military aviation community utilized 243.0 MHz as the primary distress frequency with the 121.5 MHz frequency as the alternate.
10.
In 1905 a " state of the art " spark gap transmitter generated a signal having a wavelength between 250 meters ( 1.2 MHz ) and 550 meters ( 545 kHz ) . 600 meters ( 500 kHz ) became the International distress frequency.
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