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Name Type Motor HP Port Ratios Years of Production Sound Output Type Notes Allertor 125 Electro-Mechanical 10, 15 8/12, 9/12, 10/12 (Gen 1) 9/12 (Gen 2 and 3)
Rumbler siren. A Rumbler siren is a type of emergency vehicle siren used primarily in the United States.Developed in 2007 by Federal Signal Corporation, and sounding at a low-frequency level, it is designed to be heard by motorists who may otherwise be unable to hear high-frequency sirens due to ambient noise, such as urban traffic.
The Whelen Company is divided into four divisions and has a subsidiary called Whelen Motorsports.. The four divisions of the company are as follows: The Automotive Division — provides lightbars, dashlights, strobe kits, siren boxes, and other public warning systems to be mounted on or within vehicles, [3] rotating sirens, and student alert systems with voice broadcast capability.
The 2005 NASCAR Whelen Modified Tour was the 21st season of the Whelen Modified Tour (WMT), and the first with Whelen Engineering as the title sponsor. It began with the Icebreaker 150 at Thompson Speedway Motorsports Park on April 10. It ended with the World Series of Auto Racing Pres. by Whelen at Thompson again on October 30.
The Modulator has a similar setup to the Whelen WPS 2700, 2800, 2900, and OmniAlert omnidirectional speaker arrays. The Whelen arrays have single driver cells, [3] while Modulators have multi-driver cells. The American Signal I-Force siren, which uses stacked, elliptical speaker cells that provide omnidirectional sound output, is also similar ...
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Some central office switches in the United States, notably older GTD-5 EAX systems, utilize a single frequency tone, 480 Hz, known as High Tone for this purpose. In either case, the tone is substantially louder than any other signal transmitted over a copper POTS circuit; loud enough to be heard across a room from an unused off-hook telephone.
Modified stock car racing, also known as modified racing and modified, is a type of auto racing that involves purpose-built cars simultaneously racing against each other on oval tracks.