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San Francisco, California - This system is unique featuring the sound of the decommissioned Federal Signal STL-10 sirens that the HPSS units replaced; Casitas Dam, Ventura, California - This system is unique as they look like the Federal Signal Directional Speaker Array (DSA) sirens, but can have 7–8 speakers per stack, and gray caps on the speaker cones.
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.
Belgium used to test its air raid sirens every first Thursday of the trimester (three-month period). Sirens are Sonnenburg Electronic sirens. When the air-raid sirens are tested, the message proefsignaal or signal d'essai is broadcast every time the sirens sound. There are 540 sirens all across the country. [30]
CBS defended the statement, saying that the tones' usage was a "dramatic portrayal", and that it was an "integral part of the storyline about a family's visceral reaction to a life-threatening emergency". The show's sound editors achieved the effect by downloading EAS tones from YouTube and modifying the volume of the tone.
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A 3T22A is three phase, while a 3T22B is single phase. The siren was mainly used for air raid warnings during the Cold War era and weather warnings after the war. In the early 1990s, the siren's production was stopped when it was replaced with the newer 2001-SRN, which can reach 126db (also measured 100 feet away), hence the name.