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  2. Frequency response - Wikipedia

    en.wikipedia.org/wiki/Frequency_response

    Frequency response. In signal processing and electronics, the frequency response of a system is the quantitative measure of the magnitude and phase of the output as a function of input frequency. [1] The frequency response is widely used in the design and analysis of systems, such as audio and control systems, where they simplify mathematical ...

  3. Outlawed anti-drone radio jammers are being marketed on ... - AOL

    www.aol.com/news/anti-drone-companies-market...

    Maverick Drone Systems, a Minnesota-based company, has been offering a portable anti-drone “RF jamming unit” for $2,999 on its website, with China-based company Tatusky listed as the supplier ...

  4. Radar beacon - Wikipedia

    en.wikipedia.org/wiki/Radar_beacon

    To avoid the response masking important radar targets behind the beacon, racons only operate for part of the time. In the United Kingdom , a duty cycle of about 30% is used — usually 20 seconds in which the racon will respond to radar signals is followed by 40 seconds when it will not, or sometimes 9 seconds on and 21 seconds off (as in the ...

  5. Through-the-earth mine communications - Wikipedia

    en.wikipedia.org/wiki/Through-the-earth_mine...

    Through-the-earth mine communications. Through-the-Earth (TTE) signalling is a type of radio signalling used in mines and caves that uses low-frequency waves to penetrate dirt and rock, which are opaque to higher-frequency conventional radio signals. In mining, these lower-frequency signals can be relayed underground through various antennas ...

  6. Image response - Wikipedia

    en.wikipedia.org/wiki/Image_response

    Image response (or more correctly, image response rejection ratio, or IMRR) is a measure of performance of a radio receiver that operates on the superheterodyne principle. [1] In such a radio receiver, a local oscillator (LO) is used to heterodyne or "beat" against the incoming radio frequency (RF), generating sum and difference frequencies ...

  7. Satellite emergency notification device - Wikipedia

    en.wikipedia.org/wiki/Satellite_emergency...

    Satellite emergency notification device. A Satellite Emergency Notification Device or SEND is a portable emergency notification and locating device which uses commercial satellite systems rather than the COSPAS-SARSAT satellite system. An example of this device is SPOT . The devices use an internal GPS chip to gather location information.

  8. Radio Frequency Systems - Wikipedia

    en.wikipedia.org/wiki/Radio_Frequency_Systems

    Radio Frequency Systems ( RFS) is a designer and manufacturer of coaxial cable, antenna and tower systems, as well as active and passive RF filters. In 1999, Cablewave, Celwave, and RFS merged worldwide operations and formed Radio Frequency Systems. The company has over 1,800 employees worldwide, operates seven factories (in the United States ...

  9. Sweep frequency response analysis - Wikipedia

    en.wikipedia.org/wiki/Sweep_frequency_response...

    Sweep frequency response analysis. Sweep frequency response analysis ( SFRA) is a method to evaluate the mechanical integrity of core, windings and clamping structures within power transformers by measuring their electrical transfer functions over a wide frequency range.

  10. Clansman (military radio) - Wikipedia

    en.wikipedia.org/wiki/Clansman_(military_radio)

    1980s. Clansman is the name of a combat net radio system (CNR) used by the British Army from 1976 to 2010. Clansman was developed by the Signals Research and Development Establishment (SRDE) in the 1960s, to satisfy a General Staff Requirement (GSR) laid down in 1965. Clansman represented a considerable advance over existing Larkspur radio ...

  11. Category:Retail point of sale systems - Wikipedia

    en.wikipedia.org/wiki/Category:Retail_point_of...

    A. Association for Retail Technology Standards. Automated sales suppression device.

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