Federal Signal Modulators are sirens used to alert the public about
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Federal Signal — Corporation Rechtsform Corporation ISIN US3138551086 Gründung 1901 Sitz Oak Brook, Vereinigte Staaten Leitung … Deutsch Wikipedia
Federal Signal Corporation — Infobox Company company name = Federal Signal Corporation company company type = Public (NYSE: [http://www.nyse.com/about/listed/lcddata.html?ticker=FSS FSS] ) foundation = 1901 location = flagicon|Illinois Oak Brook, Illinois, USA key people =… … Wikipedia
Bandwidth (signal processing) — Bandwidth is the difference between the upper and lower cutoff frequencies of, for example, a filter, a communication channel, or a signal spectrum, and is typically measured in hertz. In case of a baseband channel or signal, the bandwidth is… … Wikipedia
Electro-optic modulator — (EOM) is an optical device in which a signal controlled element displaying electro optic effect is used to modulate a beam of light. The modulation may be imposed on the phase, frequency, amplitude, or direction of the modulated beam. Modulation… … Wikipedia
Civil defense siren — Federal Signal Thunderbolt 1003 Civil Defense siren. A civil defense siren (also referred to as an air raid siren, tornado siren, tsunami siren, fire siren/whistle, flood siren, weather siren, time/curfew siren, or other outdoor warning siren) is … Wikipedia
Whelen 2900 series — The Whelen 2900 Series is a group of Omnidirectional Civil defense sirens similar to the Federal signal modulator. Each model begins with 2900 and the model numbers change due to the different amounts of disks on the siren. These sirens are used… … Wikipedia
Thunderbolt siren — The Thunderbolt siren is a discontinued electro mechanical warning siren that was once manufactured in the United States by Federal Signal Corporation. The Thunderbolt siren consists of three motors. The blower motor is housed inside a large… … Wikipedia
Digital rights management — (DRM) is a term for access control technologies that are used by hardware manufacturers, publishers, copyright holders and individuals to limit the use of digital content and devices. The term is used to describe any technology that inhibits uses … Wikipedia
Transmitter — For biologic transmitters, see transmitter substance. Commercial FM broadcasting transmitter at radio station WDET FM, Wayne State University, Detroit, USA. It broadcasts at 101.9 MHz with a radiated power of 48 kW. In electronics and… … Wikipedia
Single-sideband modulation — (SSB) is a refinement of amplitude modulation that more efficiently uses electrical power and bandwidth. It is closely related to vestigial sideband modulation (VSB) (see below).Amplitude modulation produces a modulated output signal that has… … Wikipedia
