A Federal Signal Modulator siren in Bay Head, New Jersey.
Federal Signal Modulators (also known as Modulator Speaker Arrays) are electronic warning devices produced by Federal Signal Corporation that are used to alert the public about tornadoes, severe weather, earthquakes, fires, lahars, tsunamis, or any other disaster. They are identified mostly by their distinctive stacked "flying saucer" design. The Modulator II is sold based on the more compact chassis of the siren compared to the original Modulators.
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a FederalSignalModulator at the Bruce Nuclear Visitor's Centre. The Public Siren network as it is called, consists of mostly Whelens, Modulators, and...
An RF modulator (radio frequency modulator) is an electronic device used to convert signals from devices such as media players, VCRs and game consoles...
are manufactured by the FederalSignal Corporation. Most of them are FederalSignalModulators. They are operated via radio signal from a control system...
may drive the signal too strongly or weakly, thus requiring constant adjustment. Pilot frequencies can be generated by an agile modulator, taking the space...
to a volcanic disaster from the Mount Rainier Volcano. Over 40 FederalSignalModulator sirens are strategically placed through the valley. When imminent...
emission in the absence of any modulatingsignal. In music production, carrier signals can be controlled by a modulatingsignal to change the sound property...
m(t)={A\cos(\omega t)}} , the modulatedsignal (derivative of the input signal) which is transmitted by the modulator is | m ˙ ( t ) | m a x = ω A {\displaystyle...
produced by FederalSignal Corporation which began production in the early 1980s. These sirens were designed to broadcast high-intensity warning signals over...
American Signal Corporation. List of civil defense sirens "Old Alerting Communicators of America Brochure". www.airraidsirens.net. 1968. American Signal website...
frequency signals. Each type of radio emission is classified according to its bandwidth, method of modulation, nature of the modulatingsignal, and type...
selective estrogen receptor modulators (SERMs). Despite its widespread use, the term "selective androgen receptor modulator" has been criticized by some...
encoded by eight 8-bit words corresponding to one pulse-code modulated cycle of the signal, sampled 8000 times per second. It is typically stored in read-only...
requirements of communications system components for a carrier signal that is frequency modulated by a continuous or broad spectrum of frequencies rather than...
signal-to-noise ratio of the high-frequency portion of the baseband, i.e., modulatingsignal, which improvement results from passing the modulating signal...
was evacuated after tornado warnings in downtown Chicago. The FederalSignalModulator behind left field sounded for the surrounding Wrigleyville area...
signal must pass through an electronic circuit containing the following components: Noise filter Analog-to-digital converter Encoder ModulatorSignal...
some characteristic of the modulatingsignal. The envelope of the modulated optical signal is an analog of the modulatingsignal in the sense that the instantaneous...
transmitted by the radio signal. The sidebands comprise all the spectral components of the modulatedsignal except the carrier. The signal components above the...
oscillator and modulator together are often referred to as the exciter. A radio frequency (RF) amplifier to increase the power of the signal, to increase...
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