distress frequency


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distress frequency

[də′stres ‚frē·kwən·sē]
(communications)
A frequency allotted to distress calls, generally by international agreement; for ships at sea and aircraft over the sea, it is 500 kilohertz.

distress frequency

The frequency used to indicate that there is an emergency or distress situation. Internationally, there are two aeronautical frequencies for this purpose: 121.5 MHz and 243.0 MHz.
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References in periodicals archive ?
30pm we could hear that a vessel had an open microphone on Channel 16 ( our calling and distress frequency.
A Man Overboard alarm unit, which is fitted to oil installations, then picks up the watch's distress frequency signal.
pilots now have access to a unique new survival device: a watch equipped with a tiny transmitter to broadcast on the international distress frequency in an aeronautical emergency.
Electronic rat scarer, operates at distress frequency pounds 70.
The 406 MHz frequency, also currently in use, will remain as the principal distress frequency.