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Beginning in the late 1960s, the electronic siren began to replace the mechanical siren. It provided several tones (wail and yelp) and a PA option. The electronic siren did not clog with snow in the winter (NYPD cops would beat the roof mounted siren with their nightsticks to break off the ice.)
The remaining sirens are a mix of older motor driven models (usually from World War II), such as the Carter siren manufactured by Carter's of Nelson or the "syren" manufactured by Gent's of Leicester, and Cold War like Castle Castings and Secomak (now Klaxon Signal Co.) and newer electronic sirens like Hormann ECN, Whelen, Federal Signal ...
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.
Sound siren producing one long note but interrupted in short succession. Can also be given by church bells or word of mouth from the police and civil defence wardens Fell out of use by the late 1960s All clear: High-pitched pip signal followed by a spoken message: "Attack message WHITE!" A steady control tone will activate the powered sirens.
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Electronic none none 1991–1994 Rotating 126 dB at 100 feet This was the replacement for the AL-6000R. It only has 4 horns rather than 8. These came with 16 100 watt drivers, 4 on each horn. Quadren Electronic none none 1992–1994 Omni/uni Directional dB rating depends on model. One of the last electronic sirens made by ACA before their ...
Hörmann GmbH began selling their ECN/ECI sirens through ASC's market. Over the decade, the prominent advancements the company made in its sirens' designs included battery operation, high powered Voice/Sirens, and indoor alerting systems. Similarly, designed sirens were still manufactured, but under new names, such as the Tempest series.
The NEAR warning device. The National Emergency Alarm Repeater (NEAR) was a civilian emergency warning device in the United States. It was a 2–3" (5–7.5 cm) square box designed to plug into a standard power outlet to receive a special signal sent over the electric power transmission lines.