Low frequency (2025 bytes)
1: '''Low Frequency''' or '''LF''' (sometimes called [[longwave]]) r...
3: ...0 kHz band must be attenuated by at least 20 dB below the level of the unmodulated carrier. Amateur Ra...
5: ... radiated power). A 1-watt transmission of very slow Morse Code between G3AQC (in the UK) and W1TAG (i...
7: ...int Pierre et Miquelon. Canada and the UK also allow licensed Radio Amateurs to use this allocation wi...

Very low frequency (7703 bytes)
1: ...marine]]s near the [[surface]]. ([[extremely low frequency|ELF]] is used for fully submerged vessels.)
3: ...netrate some dozen of meters in sea water in this frequency band. They are also used for radio navigation (al...
4: ...ch work in the frequency range under 10 kHz. This frequency range is subject to no control on the part of the...
6: ...n August 1963. It used Frequency Shift Keying ([[Frequency-shift keying|FSK]]) to send data, shifting betwee...
11: ...h your soundcard a reception of all frequencies below 24 kilohertz simultaneously in form of [[spectrog...

Low frequency oscillation (3070 bytes)
1: ... actual introduction of another sound source. Low Frequency Oscillation as a concept was first introduced in ...
3: ...0[[Hertz|Hz]]–20kHz) i.e., the frequency is low enough so that it isn't heard as a tone.
5: ...include a variety of different [[waveform]]s, a [[frequency|rate]] control, routing options (as described abo...
7: ...e, a very low rate can be used to modulate filter frequency, thereby providing the characteristic gradual sen...
9: ... take their name directly from the concept of low frequency oscillation, its properties doubtlessly influenti...

Super low frequency (1212 bytes)
1: ...which is often called incorrectly [[Extremely Low Frequency]] (ELF).
3: ...de particularly radio receivers laid out for this frequency range increasingly the PC with integrated sound m...

Extremely low frequency (3345 bytes)
1: '''Extremely low frequency (ELF)''' is the [[band (radio)|band]] of [[radio ...
3: ...ge, however, can penetrate much more deeply. The low transmission rate of most ELF communications limi...
5: ...e difficulties posed when broadcasting in the ELF frequency range is [[antenna (electronics)|antenna]] size. ...
9: ...)|pitch]], so that it is brought into the [[audio frequency]] range.
23: ...lines/index.htm Scientific Facts on Extremely Low Frequency Electromagnetic Fields] - A summary by GreenFacts...

Ultra low frequency (244 bytes)
1: ... Hertz. There are no manmade transmitters in this frequency range.

List of Low Saxon-Low Franconian languages (606 bytes)
1: The '''Low Saxon-Low Franconian languages''' include some 16 ([[SIL]] ...
3: *[[List of Low Saxon languages|Low Saxon languages]]
4: *[[List of Low Franconian languages|Low Franconian languages]]
7: ...thnologue.com/show_family.asp?subid=767 Low Saxon-Low Franconian language tree]

Frequency (3973 bytes)
1: ...|360px|[[Sine]] waves of various frequencies; the lower waves have higher frequencies than those above....
2: ... event occurs per unit [[time]]. To calculate the frequency, one fixes a time interval, counts the number of ...
4: ...ond]]. Other units that have been used to measure frequency include: cycles per second, [[rpm|revolutions per...
6: ...f the event (the [[period]]) and then compute the frequency as the reciprocal of this time:
11: ==Frequency of waves==

Frequency deviation (747 bytes)
1: ...]], the term '''frequency deviation''' has the following meanings:
3: ...or|oscillator]] frequency drifts from its nominal frequency.
5: ...frequency of the modulated wave and the [[carrier frequency]].
7: ...s frequency of the modulated wave and the carrier frequency.

High frequency (1006 bytes)
1: '''High frequency (HF)''' [[radio frequency|radio frequencies]] are between 3 and 30 [[MHz]]....
11: *[[Maximum usable frequency]]
12: *[[Lowest usable frequency]]
13: *Frequency of operation within the HF range
18: *[[Very high frequency|VHF]], [[AM radio]], [[Radio propagation]]

Frequency sharing (507 bytes)
1: ...that are separated geographically or that use the frequency at different times.
3: Frequency sharing reduces the potential for mutual [[interf...
5: ...ng does not pertain to stations that use the same frequency.

Frequency shift (700 bytes)
1: ...tion]], the term '''frequency shift''' has the following meanings:
3: * Any change in [[frequency]]
4: ...illator|oscillator]]. (Note: In the radio regime, frequency shift is also called rf shift.)
5: * [[Frequency-shift telegraphy]]
6: ...ne frequency represents picture black and another frequency represents [[picture white]]. Frequencies between...

Frequency standard (845 bytes)
1: ...e [[electronic oscillator|oscillator]] used for [[frequency]] [[calibration]] or reference.
3: ...cy and precision]]. Harmonics of this fundamental frequency are used to provide reference points.
5: ...e words in the discipline of [[precise time]] and frequency.

Image frequency (408 bytes)
1: ...ermediate frequency]] (IF) that the desired input frequency produces.
3: ... the beating-[[electronic oscillator|oscillator]] frequency.

Frequency extender (1625 bytes)
1: ...xtender''' is an [[electronic]] [[device]] that allows [[high-fidelity]] [[analog]]ue [[audio]] to be s...
3: ... [[bandpass]] limit in telephony. Thus, an audio frequency of 5kHz is sent at 2kHz. A [[receiver]] on the o...

Frequency frogging (1301 bytes)
1: ...n]], the term '''frequency frogging''' has the following meanings:
3: ...o reduce [[crosstalk]], and to correct for a high frequency-response [[slope]] in the [[transmission line]]. ...
5: ...peater]] is at a different [[frequency]] than the low-level [[input]] to other repeaters.

Relative frequency (754 bytes)
1: ...s of observations, or ''trials'', the '''relative frequency''' of occurrence of an event is calculated as:
2: :<math>\mbox{relative frequency of event } E = {\mbox{number of times the event }...
4: ...ceptual foundation of the [[frequency probability|frequency interpretation]] of [[probability]]. In this fram...
8: * [[Frequency]]

Critical frequency (810 bytes)
1: ...n]], the term '''critical frequency''' has the following meanings:
3: ...osphere]], the [[limiting]] [[frequency]] at or below which a wave [[component]] is reflected by, and a...
5: ...ertical incidence, the limiting frequency at or below which incidence, the wave component is reflected ...
7: The existence of the critical frequency is the result of electron limitation, <i>i.e.,</i...
9: ...uency'' it is also another name for the [[Nyquist frequency]].

Cutoff frequency (1364 bytes)
1: ...'cutoff frequency''' ''f''_c has the following meanings:
3: ...calculation of the [[center frequency]] of such a frequency band is not the [[arithmetic mean]] but the [[geo...
7: <b>2.</b> The frequency below which a [[radio wave]] fails to penetrate a [[lay...
9: ...dpass]] has two cutoff frequencies and a [[center frequency]].<br>
10: See also: [[low-pass filter]] and [[high-pass filter]].

Frequency assignment (801 bytes)
1: ...], the term '''frequency assignment''' has the following meanings:
3: ...o station]] to use a [[radio frequency]] or radio frequency [[channel]] under specified conditions. <p>
4: ...cycle]], or [[modulation]]. ''Synonym'' '''radio frequency channel assignment.''' ''See'' '''[[administratio...

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