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Other tones include Westminster Chimes (commonly used for the testing of electronic sirens), hi-lo (high-low), whoop, pulse (pulsing), air horn, and fast wail. The U.S. federal standard regarding emergency warning signals is defined in FEMA's Outdoor Warning Systems Guide, CPG 1–17, [ 97 ] published on March 1, 1980, which describes the Civil ...
Electronic sirens incorporate circuits such as oscillators, modulators, and amplifiers to synthesize a selected siren tone (wail, yelp, pierce/priority/phaser, hi-lo, scan, airhorn, manual, and a few more) which is played through external speakers. It is not unusual, especially in the case of modern fire engines, to see an emergency vehicle ...
The SuperBanshee (originally called Banshee 120) was a dual-rotor omni directional siren. Most were only capable of the standard two signals, but they were also available with coding dampers to make the Hi-Lo signal for local code purposes. Banshee Electro-Mechanical 10 (Banshee 110), 15 (Banshee 115).
A Federal Signal Thunderbolt 1003 siren. The Thunderbolt is a mechanical outdoor warning siren that was manufactured by Federal Signal Corporation from 1951 until its production ended in 1991. [1] It is a unidirectional, rotating siren with a large square-shaped horn, and can come in various colors, usually yellow, by request.
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ACA Allertor 125 (Optional 3-signal variant, using additional motor and producing yelp tone instead of pulse/Hi-Lo) ACA Screamer Series (Ranging from 2 HP to 10 HP) ACA Banshee 110 (Optional 3-signal variant) ACA Banshee 115 (Optional 3-signal variant) ACA Super Banshee 120 (Optional 3-signal variant, having the Ability to produce a Hi-Lo Tone)
The 2T22 and 3T22 can produce 113db (measured 100 feet away from the siren). There are four models of this type of siren. the 2T22 A and B and the 3T22 A and B. In the name 3T22, the 3 stands for its three main signals: attack (wail), alert (steady), and hi-lo, and the 22 again stands for the twenty-two cones.
Until 2017, some sirens ran on a major third dual-tone alert. Baytown, Texas is one of only a few cities in the United States to have a whole system of Modulators. The city uses just over twenty 5020s and 5020Bs, primarily for notification of chemical releases. The warning tone is a custom Hi-Lo signal.