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Flutter

Flutter: Rapid variation of signal parameters, such as amplitude, phase, and frequency.

Note: Examples of flutter are;

  • rapid variations in received signal levels, such as variations that may be caused by atmospheric disturbances, antenna movements in a high wind, or interaction with other signals,
  • in radio propagation, a phenomenon in which nearly all radio signals that are usually reflected by ionospheric layers in or above the E-region experience partial or complete absorption,
  • in radio transmission, rapidly changing signal levels, together with variable multipath time delays, caused by reflection and possible partial absorption of the signal by aircraft flying through the radio beam[?] or common scatter volume,
  • the variation in the transmission characteristics of a loaded telephone circuit caused by the action of telegraph direct currents on the loading coils,
  • in recording and reproducing equipment, the deviation of frequency caused by irregular mechanical motion, e.g., that of capstan angular velocity in a tape transport mechanism, during operation.

Source: from Federal Standard 1037C and from MIL-STD-188



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