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 ?
The lowest scoring item for moral distress frequency was 'Increase the dose sedative/opiates for an unconscious patient that I believe could hasten the patients' death' (mean 1.
Pilot Linton Chilcott received a radio call from a US warship on a distress frequency, telling him he was in a restricted area and to change course at once.
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.
Electronic rat scarer, operates at distress frequency pounds 70.
The main distress frequency for sea-going vessels, Channel 16 VHF, was playing Moray Firth Radio's Breakfast Show instead of remaining open to take Mayday calls.