Model 7

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C3 1/2
Advertisements for the C3 1/2, circa. late 1970s
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Company Federal Signal Corporation
Produced 1938-1987
Type Electromechanical
Sound output 113 or 108[1]
Preceded by Model 5 (1976)
Succeeded by STH-10
Documentation Manual


The C3 1/2, or commonly known as Model 7 was a 5, 7.5, and sometimes 10 horsepower, mechanical, omnidirectional siren produced by Federal Signal Corporation part of the Fedelcode lineup. The rotor in the C3 1/2 is 18" and shares it with the 500 Series and SD-10. Prior to the end of production, Federal decided to rename the Model 7 to the Model 5, as the Model 5 was already discontinued. There is no explanation known as of why Federal Signal decided to do this.

Model 7 was available in 3 different chopper configurations: 8 port single tone, 12 port single tone, and 9/12 port dual tone. The siren was housed in a very simple enclosure that resembles an air vent found on building roofs. The housing came in either painted steel or stainless steel.

  1. (PDF) Service Manual for Models 2, 7, SD10, STH10, STL10. Federal Signal Corporation. Retrieved October 22, 2017.