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2. 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 ...

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. Emergency population warning - Wikipedia

   en.wikipedia.org/wiki/Emergency_population_warning

   It consists in a modulated sound going up and down (up to 380 Hz) during the first minute, and repeated three times. The end of alert is a continuous signal lasting 30 seconds. The system is tested the first Wednesday of every month at 11.45 in the north, 12.00 in the center, and at 12.15 in the south; for tests, the modulated signal is played ...

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

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

   Officials in Tennessee are facing questions after tornado sirens allegedly failed to sound to alert residents to the storm that killed six people.. Tornadoes and severe thunderstorms tore through ...

6. Richland County to spent nearly $194,000 to upgrade tornado ...

   www.aol.com/richland-county-spent-nearly-194...

   The upgrade includes new control boards to activate the sirens through M.A.R.C.S. and cellular LTE and also will monitor siren activation status through a computer browser interface.

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

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

   Federal_Signal_RSH-10_Thunderbeam_video.ogv (Ogg multiplexed audio/video file, Theora/Vorbis, length 9 min 44 s, 720 × 480 pixels, 360 kbps overall, file size: 25.05 MB) This is a file from the Wikimedia Commons .

8. Warning sirens sound as multiple tornadoes touch down near ...

   www.aol.com/warning-sirens-sound-multiple...

   Warning sirens could be heard ringing out in downtown Chicago as multiple tornadoes touched down close to the city on Wednesday 12 July. The eerie sound could be heard in footage posted by Twitter ...

9. Civil defense siren - Wikipedia

   en.wikipedia.org/wiki/Civil_defense_siren

   Most newer (and some older) electronic sirens have the ability to store digital audio files. These audio files could be custom sounds, or emergency messages. [14] Depending on the situation, the stored sound file can broadcast through the siren. [15] These sirens could also come with a Microphone Jack to broadcast live messages via microphone. [16]