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47 CFR § 80.317 - Radiotelegraph and radiotelephone …
https://www.law.cornell.edu/cfr/text/47/80.317
The purpose of this special signal is the actuation of automatic devices giving the alarm to attract the attention of the operator when there is no listening watch on the distress frequency. (b) The international radiotelephone alarm signal consists of two substantially sinusoidal audio frequency tones transmitted alternately. One tone must have a frequency of 2200 Hertz and the other a …
M.219-1 - Alarm signal for use on the maritime ...
https://www.itu.int/dms_pubrec/itu-r/rec/m/R-REC-M.219-1-196607-W!!PDF-E.pdf
1. that the alarm signal described below should be adopted internationally, for use on the maritime radiotelephony calling and distress frequency of 2182 kHz; 1.1 the alarm signal shall consist of two substantially sinusoidal audio-frequency tones, transmitted alternately.
eCFR :: 47 CFR Part 80 Subpart G -- Safety Watch ...
https://www.ecfr.gov/current/title-47/chapter-I/subchapter-D/part-80/subpart-G
(b) The international radiotelephone alarm signal consists of two substantially sinusoidal audio frequency tones transmitted alternately. One tone must have a frequency of 2200 Hertz and the other a frequency of 1300 Hertz, the duration of each tone being 250 milliseconds.
eCFR :: 47 CFR Part 80 Subpart G - Distress, Alarm ...
https://www.ecfr.gov/current/title-47/chapter-I/subchapter-D/part-80/subpart-G/subject-group-ECFR7e19a041274508c
(b) The international radiotelephone alarm signal consists of two substantially sinusoidal audio frequency tones transmitted alternately. One tone must have a frequency of 2200 Hertz and the other a frequency of 1300 Hertz, the duration of each tone being 250 milliseconds.
Navigation (Signals of Distress, Urgency Signals and ...
https://www.legislation.gov.au/Details/C2004H02475
(1) A radiotelephone alarm signal shall consist of two sinusoidal audio frequency tones transmitted alternately, one having a frequency of two thousand two hundred hertz and the other having a frequency of one thousand three hundred hertz, the duration of each tone being two hundred and fifty milliseconds.
47 CFR § 80.268 - Technical requirements for ...
https://www.law.cornell.edu/cfr/text/47/80.268
(1) The radiotelephone receiver must receive A3E and H3E emissions when connected to the antenna system specified in paragraph (c) this section and must be preset to 2182 kHz. The receiver must additionally: (i) Provide an audio output of 50 milliwatts to a loudspeaker when the RF input is 50 microvolts. The 50 microvolt input signal must be modulated 30 percent at 400 …
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