Equipment that converts electromagnetic energy into an electrical signal that can be further processed.

Automatic Frequency Control

A circuit that keeps a receiver in tune with the wanted transmission.


The reception of so much power that component damage occurs.


The stage or circuit of a receiver where the audio or video signal is separated from the carrier signal. Normally a rectifier, the output of which drives a lower frequency device.


Noises produced within a receiver, consisting of four types:

  1. thermal agitation,
  2. shot effect
  3. microphonics
  4. hum from the a-c power source

Off Frequency Rejection

The amount of attenuation to a signal at a frequency other than the tuned frequency as a result of the selectivity characteristic of the receiver and the power-versus-frequency characteristic of the signal.

Receiver Noise Figure

A measure of signal-to-noise ratio degradation as the signal passes through the receiver.

See also: Angle of Arrival, Frequency Hopping, Logarithmic Receiver, Receiver Antenna, Receiver Noise Figure, Receiver Sensitivity, Selectivity, Spectrum Signature, Spurious Response, Squelch, Superheterodyne Receiver, Torque Differential Receiver, Transmitter, Transponder.

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Subjects: Electronics