Both were effectively replaced by the Eclipse-8 in Federal Signal's lineup, as it had battery backup capabilities and improved performance while operating at a similar pitch. The STL-10 saw most of its success in urban areas such as New York, where its piercing low sound was distinctly heard over the noise of traffic at great distances.ĭue to waning sales as the use of fire sirens diminished, and likely to save costs, the STL-10 was discontinued in 1995, while the STH-10 continued to be sold until 2005. The STL-10 was nowhere as popular as the STH-10, and as a result, they are harder to find than STH-10s. While they were also used for civil defense purposes, their main purpose was to alert volunteer firefighters to report to the fire station to go fight a fire. The STL-10, along with its smaller brother the STH-10, were mainly sold as fire sirens. The siren was especially suitable in urban areas, where higher pitched sirens may lose range from traffic noise and the many obstructions such as buildings. The low pitch made it more effective in areas where range was more important than pitch, or where a higher-pitch sound may be lost in other background noise. A few remain today, but they are very hard to find. Early STL-10s used square horns, but these were quickly switched to round horns as they proved easier to manufacture and were more durable.
Mesh screens are included to protect the rotor from debris. there are 7 large round horns attached to each stator port, which assist in projecting the sound from the rotor, and a cylindrical intake is located below the siren in between the siren's three included mounting legs. The bare motor is atop the siren with an eyebolt attached for mounting and has no shielding from the elements. The STL-10 is a very basic siren in design, using a motor-over-rotor configuration. However, Federal ultimately chose to use the STH-10's rotor and stator instead.Ī rare square-horned STL-10, located in North Amityville, NY. The rotor and stator of the STL-10 were also used in the prototypical phase of the RSH-10, as the RSL-10. The STL-10 was available with either a single or three-phase electric motor, with the siren being designated as the STL-10B or STL-10A, respectively. Its low tone is very distinctive and can be heard for miles due to its pitch, and the siren boasts a decibel rating of 114 dB at 100ft.
The STL-10 sports a 24-inch 7-port rotor and stator, a 10HP AC induction motor on top, and 7 rounded metal horns attached to each stator port to project the sound directly from the chopper. It was produced between 1953 to the 1990s as an alternative to Federal's popular STH-10, SD-10, and XT22 sirens and found popularity as both a fire siren and a civil defense siren. The STL-10 (Single Tone Low, 10 Horsepower) is an omnidirectional vertical siren that was produced by Federal Signal during the mid to late 20th century. Federal Signal STH-10B Remastered Description Discussions 0 Comments 1 Change Notes Award Favorite Share Add to Collection Era: 1900s Type: Prop File Size Posted 0.
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