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  2. Detector (radio) - Wikipedia

    en.wikipedia.org/wiki/Detector_(radio)

    The mixer is called the first detector, while the demodulator that extracts the audio signal from the intermediate frequency is called the second detector. In microwave and millimeter wave technology the terms detector and crystal detector refer to waveguide or coaxial transmission line components, used for power or SWR measurement, that ...

  3. RF probe - Wikipedia

    en.wikipedia.org/wiki/RF_probe

    In this situation, a simple probe type sometimes called an RF detector can be used to convert the RF signal to DC. Such device will work as a RF rectifier and give a pulsed DC voltage. [2] The second kind of difficulty arises when RF energy has to be measured in a circuit which is sensitive to small changes in its electrical environment.

  4. Reflex receiver - Wikipedia

    en.wikipedia.org/wiki/Reflex_receiver

    The single triode vacuum tube amplifies the radio signal, then also amplifies the audio modulation signal extracted from it by the detector. A reflex radio receiver, occasionally called a reflectional receiver, is a radio receiver design in which the same amplifier is used to amplify the high-frequency radio signal (RF) and low-frequency audio ...

  5. RF chain - Wikipedia

    en.wikipedia.org/wiki/RF_Chain

    An RF chain is a cascade of electronic components and sub-units which may include amplifiers, filters, mixers, attenuators and detectors. [1] It can take many forms, for example, as a wide-band receiver-detector for electronic warfare (EW) applications, as a tunable narrow-band receiver for communications purposes, as a repeater in signal distribution systems, or as an amplifier and up ...

  6. Radiofrequency MASINT - Wikipedia

    en.wikipedia.org/wiki/Radiofrequency_MASINT

    The RED signal, at a low power level, may be intercepted directly, or there may be intermodulation between the RED and BLACK signals. HIJACK is a more advanced threat, where the RED signal modulates a RF signal generated within the secure area, such as a cellular telephone. [10]

  7. Radio frequency - Wikipedia

    en.wikipedia.org/wiki/Radio_frequency

    Radio frequency (RF) is the oscillation rate of an alternating electric current or voltage or of a magnetic, electric or electromagnetic field or mechanical system in the frequency [1] range from around 20 kHz to around 300 GHz.

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