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...typically operate these radios using [[frequency modulation]] in the [[ITU frequency bands|high HF to low VHF frequencies]], typically 30-75 MHz.

...sent [[MILSTAR]] system, or their replacement, the Advanced Extremely High Frequency (AEHF) satellites. AEHF will provide substantially more bandwidt. ...eosynchronous orbit (GEO)]], and have six [[ITU frequency bands|Super High Frequency (SHF)]] communications relay channel [[transponder]]s, plus a seventh chann

A radio frequency exitation and receiving probe whose electronics are cooled to 15-25 degrees

Directional frequency analysis and recording (DIFAR) passive [[sonobuoy]] family built for the [[

==Fundamental frequency== ...l vibration frequencies are typically integer multiples of the fundamental frequency. In more complex systems, such as the circular membranes used for drum head

Perceived frequency of a sound or [[Tone (music)|musical tone]].

Frequency measurement - things that [[oscillate]] more than one million times a secon

'''RF (radio frequency) electronics''' have two subsystems: the transmitter and the receiver. ...MR experiments require simultaneous application of RF pulses of different frequency. Earlier MR systems used waveform generators with subsequent phase modulati

Auto-populated based on [[Special:WhatLinksHere/ITU frequency bands]]. Needs checking by a human. {{r|EU-NATO-US frequency bands}}

Soviet [[EU-NATO-US frequency bands|E-band]] early warning radar, used with [[SA-5 GAMMON]] [[surface-to-

States that [[gene frequency]] remains constant across generations (no [[genetic drift]]) unless a force

The international ([[SI]]) unit of [[frequency]], with units of inverse [[second]]s, commonly called cycles per seocond.

==Operating frequency tradeoffs== Satellites operating in the [[ITU Frequency Bands|Ultra-High Frequency (UHF)]] offer the advantage of simple receivers and antennas, with plausibl

...t frequency'' from the local oscillator, and the known unmodulated carrier frequency. ...ubsequent stages of the receiver are pretuned, such as 455 kHz in a medium-frequency AM broadcast radio.

...r wave of the basic waveform. While the term is most often used with radio frequency carrier waves, it can apply to sound waves as well, such as when a basic st ...dulation:Changing the frequency (i.e., the time between peaks of the basic frequency)

Electromagnetic noise proportional to f^-n, where f = frequency and n={0,1,2).

In a sound, the overall deviation of the frequency ratios from those of an [[overtone]] series.

The asymptotic frequency of a subset of the natural numbers.

...frequency bands|high frequency (HF)]] or [[ITU frequency bands| very high frequency (VHF)]].

a symmetrical bell-shaped probability distribution representing the frequency of random variations of a quantity from its mean.