Until 2017, some sirens ran on a major third dual-tone alert.īaytown, Texas is one of only a few cities in the United States to have a whole system of Modulators. They are placed only a half-mile from each other in some parts of the city. The city of Moore, Oklahoma is well known for their Modulators being placed closer together in comparison to other cities. The city of Chicago no longer does its Alternate Wail mode (possibly due to its popularity), and was replaced by Attack mode in the late 2010s. 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. Many people refer the Modulator as the "Chicago Siren", "Scary Tornado Siren", " Cthulhu" and " Siren Head" due to the unsettling nature of the tone. Recordings of the siren have been uploaded to YouTube, with the videos reaching millions of views. The Modulators in Chicago's siren system formerly used to run on the noticeably different and somewhat off-putting Alternate Wail tone during tornado warnings in order to vary from emergency vehicle sirens, often mistaken for being broken, malfunctioning, or hacked. The American Signal I-Force siren, which uses stacked, elliptical speaker cells that provide omnidirectional sound output, is also similar to the Modulator. The Whelen arrays have single driver cells, while Modulators have multi-driver cells. The Modulator has a similar setup to the Whelen WPS 2700, 2800, 2900, and OmniAlert omnidirectional speaker arrays. They are also capable of being activated automatically by the Emergency Alert System. The sirens can be activated by radio using single tone, two-tone, DTMF, MSK or POCSAG over analog, digital and trunking systems, or by satellite, cellular, landline or IP. They have also been known to play Star Spangled Banner during tests on or near the 4th of July, and also on military bases. If properly equipped, the Modulator can also employ voice notification to give specific information or to give a more clear understanding of an emergency situation. The seven standard tones are Wail, Alternate Wail, Pulsed Wail, Steady, Alternate Steady, Pulsed Steady and Westminster Chimes. Similar to Federal Signal's previous Electronic Outdoor Warning Siren series, the Modulator can produce seven standard warning tones. They provide the same alerting technology as the original modulator, with the exception of a smaller compact chassis and cylindrical modules instead of elliptical ones. In January 2013, Federal Signal released the Modulator II sirens, consisting of the 1004B, 2008B, 3012B, 4016B, 5020B, 6024B, and 8032B models. The first family of modulator arrays consisted of eight different models, as follows: 1004, 2008, 3012, 4016, 5020, 6024, 6032, and 6048. Modulator model numbers identify the number of cells, as well as the number of drivers. When they were first made, they were used with Modulator Control Plus(MPC) and basic/standard Modulator Controls. Modulators that are being made now use the UltraVoice controller. ![]() Due to the design of active cells, there would be unbalanced sound distribution without the inactive cell. Modulators have an inactive (dummy) speaker cell on the bottom of the stack that is used to help project sound in all directions. The modulator is composed of speaker cells (ranging from two to eight, with the exception of seven) that contain four speaker drivers per cell, although two models (model 60) had additional drivers available when they were still produced. ![]() The Modulator II is sold based on the more compact chassis of the siren compared to the original Modulators. They are identified mostly by their distinctive stacked "flying saucer" design. A Federal Signal Modulator siren in Bay Head, New Jersey.įederal Signal Modulators (also known as Modulator Speaker Arrays) are electronic warning devices produced by Federal Signal Corporation that are used to alert the public about tornadoes, severe weather, earthquakes, fires, lahars, tsunamis, or any other disaster.
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