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Readiness alarm (Beredskapslarm): a 5-minute pattern of 30 second tones separated by 15 second gaps. Used when an imminent danger of war is present. Air raid alarm (Flyglarm): a 1-minute pattern of 2 second tones separated by 2 second gaps. Sent when the threat of an air attack is imminent.
Stage 2: When a confirmation signal fails to occur within 15 seconds in Stage 1, an alarm will sound on the bridge, and if there is still no confirmation signal after a further 15 seconds, in the captain's and the first officer's cabins. [2] One of them must then go to the bridge and cancel the alarm.
Next, the Attention Signal was transmitted. Prior to 1976, primary stations would turn their transmitters off for five seconds, back on for five seconds, off for five seconds more, then go back on air and transmit a 1000 Hz tone for 15 seconds to alert secondary stations, as was used by predecessor CONELRAD.
[15] [16] [19] At 11:45 a.m. on January 2, 2018, the state conducted its monthly test of the civil defense outdoor warning siren system including the sounding of a one-minute Attention Alert Signal (Steady Tone) followed by a one-minute Attack Warning Signal (Wailing Tone). [20] There was no exercise or drill accompanying the test. [20]
From NFPA 72, 2002 Edition: “7.4.2.1* To ensure that audible public mode signals are clearly heard, unless otherwise permitted by 7.4.2.2 through 7.4.2.5, they shall have a sound level at least 15 dB above the average ambient sound level or 5 dB above the maximum sound level having a duration of at least 60 seconds, whichever is greater ...
This frequency is a power of two (32 768 = 2 15), just high enough to exceed the human hearing range, yet low enough to keep electric energy consumption, cost and size at a modest level and to permit inexpensive counters to derive a 1-second pulse. [3] The data line output from such a quartz resonator goes high and low 32 768 times a second.
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When activating for a lack of motion, the PASS device will typically emit a few seconds of a muted warning that activation is about to occur, [1] so that a firefighter who has simply been motionless for a time but is otherwise safe will be able to move slightly and thus reset the activation timer before a false activation occurs.