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  2. File:Federal Signal RSH-10 Thunderbeam video.ogv - Wikipedia

    en.wikipedia.org/wiki/File:Federal_Signal_RSH-10...

    I, the copyright holder of this work, hereby publish it under the following licenses: Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License , Version 1.2 or any later version published by the Free Software Foundation ; with no Invariant Sections, no Front-Cover Texts, and no ...

  3. ATI HPSS - Wikipedia

    en.wikipedia.org/wiki/ATI_HPSS

    Pensacola NAS, Florida, ATI HPSS16 (mostly), the sirens on Pensacola's navy base are mostly used for tornado warnings and they play the colors in the morning and evening. When a warning is issued, these siren sound ATI's version of wail signal during tornado warnings. Attack signal or other signals have not been used yet.

  4. Siren (alarm) - Wikipedia

    en.wikipedia.org/wiki/Siren_(alarm)

    In a pneumatic siren, the stator is the part which cuts off and reopens air as rotating blades of a chopper move past the port holes of the stator, generating sound. The pitch of the siren's sound is a function of the speed of the rotor and the number of holes in the stator. A siren with only one row of ports is called a single tone siren.

  5. Standard Emergency Warning Signal - Wikipedia

    en.wikipedia.org/wiki/Standard_Emergency_Warning...

    The Standard Emergency Warning Signal (SEWS) is a warning siren used in Australia to alert the public of danger. The siren is played over radio, television or public address systems in public places to warn of bushfire , flood , cyclone , tsunami , earthquake or terrorist attack .

  6. Federal Signal Modulator - Wikipedia

    en.wikipedia.org/wiki/Federal_Signal_Modulator

    The Modulators in Chicago's siren system formerly used to run on the Alternate Wail tone during tornado warnings in order to vary from emergency vehicle sirens. However, in O'Hare International Airport, instead of using the main UV Wail or Attack, they use an Eclipse 8 (possibly) sound card doing attack. Before that is the Westminster Chimes ...

  7. Tennessee tornado sirens failed to sound in storm that ... - AOL

    www.aol.com/news/tennessee-tornado-sirens-failed...

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