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Topic: Super low frequency

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	Super low frequency - Wikipedia, the free encyclopedia
		Super Low Frequency (SLF) is the frequency range between 30 hertz and 300 hertz.
		This frequency range includes the frequencies of AC power grids (50 hertz and 60 hertz).
		PCs with integrated sound cards are increasingly being used instead of radio receivers for this frequency range, because of their much smaller size and lower cost.
	en.wikipedia.org /wiki/Super_low_frequency (190 words)

	NationMaster - Encyclopedia: High frequency (Site not responding. Last check: 2007-10-03)
		The high frequency band is very popular with amateur radio operators, who can take advantage of direct, long-distance (often inter-continental) communications and the "thrill factor" resulting from making contacts in variable conditions.
		International shortwave broadcasting utilizes this set of frequencies, as well as a seemingly declining number of "utility" users (marine, aviation, military, and diplomatic interests), who have, in recent years, been swayed over to less volatile means of communication (for example, via satellites), but may maintain HF stations after switch-over for back-up purposes.
		The lowest usable high frequency (LUF), in radio transmission, is that frequency in the HF band at which the received field intensity is sufficient to provide the required signal-to-noise ratio for a specified time period, e.
	www.nationmaster.com /encyclopedia/High-frequency (1411 words)

	NationMaster - Encyclopedia: Very low frequency (Site not responding. Last check: 2007-10-03)
		This frequency range is used presently for the transmission of instructions to submerged submarines (for example with the transmitter DHO38), since radio waves can penetrate some dozen of meters in sea water in this frequency band.
		This frequency range is subject to no control on the part of the international communications organization (International Telecommunication Union) and may be used in some states license-free.
		Therefore, the high frequency of the VLF transmitters means that in more conductive environments, the exploration depth is quite shallow; for example, the depth of exploration might be 10 to 12 m in 25-Ωm material.
	www.nationmaster.com /encyclopedia/Very-low-frequency (2128 words)

	Radio frequency - Wikipedia, the free encyclopedia
		Radio frequency, or RF, refers to that portion of the electromagnetic spectrum in which electromagnetic waves can be generated by alternating current fed to an antenna.
		Above 300 GHz, the absorption of electromagnetic radiation by Earth's atmosphere is so great that the atmosphere is effectively opaque to higher frequencies of electromagnetic radiation, until the atmosphere becomes transparent again in the so-called infrared and optical window frequency ranges.
		The ELF, SLF, ULF, and VLF bands overlap the AF (audio frequency) spectrum, which is approximately 20–20,000 Hz.
	en.wikipedia.org /wiki/Radio_frequency (363 words)

	Ear Health, by Jody Nagel
		High frequencies coupled with low frequencies tend to mitigate, to some extent, the negative effect of low frequencies.
		In the region of 3,000 to 20,000 Hz, sound mainly serves the function of producing cortical arousal, whereas low frequencies tend to exhaust the system; they can actually be dangerous, as they demand of the body a greater discharge of energy than the cortex receives in stimulation.
		Super low frequency, high amplitude waves are now being studied by the military as forms of weaponry and crowd control, because the right combination of sonic factors apparently causes people to lose control of their intestines.
	www.jomarpress.com /nagel/essays/EarHealth.html (1782 words)

	Super low frequency: Facts and details from Encyclopedia Topic (Site not responding. Last check: 2007-10-03)
		Frequency is the measurement of the number of times that a repeated event occurs per unit time....
		The hertz (symbol hz) is the si unit of frequency....
		Low frequency or lf (sometimes called longwave) refers to radio frequencies (rf) in the range of 30-300 khz....
	www.absoluteastronomy.com /encyclopedia/s/su/super_low_frequency.htm (514 words)

	YH Audio (Site not responding. Last check: 2007-10-03)
		Low frequency of 18 inch is not so strong, but the distance by the transfer of sound is long.
		Low frequency of 15 inch is a little bit strong, but the distance bye the transfer of sound is short.
		because the frequency of the vocal is lowly, but 18 low frequency speaker is deeply and transfer long.
	www.yhaudio.cn /eghtml/support.htm (662 words)

	Radio frequency Information - police radio frequency
		Radio frequency, or RF, refers to that portion of the electromagnetic am, fm radio frequency spectrum in which electromagnetic police radio frequency in uk waves can radio frequency chart be generated by alternating current fed to an antenna.
		However, sounds are transmitted family radio service frequency radio 4 frequency what is vhf radio frequency range by atmospheric compression and expansion, and not by electromagnetic energy.
		The range of allowed radio scanner frequency in the uk frequencies radio frequency guides vary police radio frequency identification amateur radio frequency beacons system definition for radio frequency radio frequency between countries.
	www.inanot.com /Ina-Electronics_Topics_Pi_-_Ra-/Radio_frequency.html (347 words)

	Radio \| TutorGig.co.uk Encyclopedia (Site not responding. Last check: 2007-10-03)
		Since the energy of an individual photon of radio frequency is too low to remove an electron from an atom, radio waves are classified as non-ionizing radiation.
		Electromagnetic radiation travels (propagates) by means of oscillating electromagnetic fields that pass through the air and the vacuum of space equally well, and does not require a medium of transport (such as the aether).
		The next advance was continuous wave telegraphy, or CW, in which a pure radio frequency, produced by a vacuum tube electronic oscillator was switched on and off by a key.
	www.tutorgig.co.uk /encyclopedia/getdefn.jsp?keywords=Radio (4021 words)

	YMEC software - ANALYSIS OF THE LOW FREQUENCY COMPONENTS OF JET PLANE ( Aircraft noise analysis 10)
		The effect and the mechanism of the low frequency noise are not fully understood.
		To analyze a low frequency sound, the running ACF is measured for 0.5 s.
		When the low frequency is contained, the WIACC becomes a large value.
	www.ymec.com /hp/signal2/air10.htm (442 words)

	Articles - Radio wave (Site not responding. Last check: 2007-10-03)
		The frequency of a wave is its rate of oscillation and is measured in hertz, the SI unit of frequency, equal to one oscillation per second.
		The frequency of the radiation determines the magnitude of the energy of the particles.
		When considered as particles, they are known as photons, and each has an energy related to the frequency of the wave given by Planck´s relation E = hÎ½, where E is the energy of the photon, h = 6.626 Ã— 10 JÂ·s is Planck´s constant, and Î½ is the frequency of the wave.
	www.newmirror.com /articles/Radio_wave (1983 words)

	PamDixon.com
		An important aspect of bird song is the frequencies that are in it, says Eugene Morton, a researcher at the National Zoo and the Smithsonian Institute.
		Frequency is so important to birds, in fact, that scientists can identify species of birds in a region simply by the frequencies of their calls.
		Frogs have developed the ability to filter the distinct frequencies and rhythms of their own species' calls through a thick curtain of background sounds in a jungle.
	www.pamdixon.com /takingnote.htm (2018 words)

	[No title]
		ELF Extremely Low Frequency (3-300 Hz) This is mostly power systems, though the US military Project ELF uses it to communicate with submarines, at a data rate measured in minutes per word.
		Frequency Modulation FM More recent modulation scheme, invented between the world wars by Major Armstrong for RCA, that varies the frequency of the carrier wave to encode speech or data.
		Frequency crystals are used in all modern radios to generate waves used in tuning or transmitting with computerlike "synthesizers." Older radios used specially cut crystals, sometimes in warm metal boxes called "ovens," to determine the frequency when accuracy was desired over agility.
	www.ominous-valve.com /jargon.txt (7484 words)

	Transmission line speaker system
		The biggest advantage of this method may be the extension of low range and damping, but it should also be mentioned that the sound from the back side of a bass driver does not leak to the front side through the thin cone paper.
		Q becomes lower by an acoustic stuff, and the group delay characteristic at super low frequency is also similar to the acoustic air suspension.
		A resonance frequency is the frequency on which the denominator polynomial of the wave equation approaches zero.
	www.gem.hi-ho.ne.jp /katsu-san/audio/Speaker/TLS_eng.html (3454 words)

	Basics
		To produce low frequencies a driver needs to have a large diaphragm and enough mass to resonate at a low frequency.
		It uses a tweeter for the high frequencies and a woofer for the low frequencies.
		Ideally, a crossover frequency is chosen which protects the tweeter, allowing it to produce only those frequencies that it can reproduce the best, and allows both the response and coverage pattern of the woofer to blend well with the tweeter.
	www.ht-audio.com /basics.htm (5326 words)

	eEngineer -- Radio Frequency Band Designations
		The letter band designations are not a substitute for the specific frequency limits of the frequency bands.
		The specific frequency limits should be used when appropriate, unless a letter designation of the radar frequency band is required.
		The UHF (upper), SHF and EHF regions of the electromagnetic frequency spectrum are generally classified as microwave frequencies.
	www.radioing.com /eengineer/bands.html (251 words)

	massager super low frequency massager
		When you're after the best information on super low frequency massager, it'll be complex separating superior advice from unprofessional super low frequency massager proposals and directions so it is sensible to know ways of judging the information you are offered.
		A terrifc piece of advice you can follow when offered information or advice on a super low frequency massager web page is to verify the ownership of the website.
		This could reveal the people behind the website super low frequency massager qualifications The fastest way to determine who owns the super low frequency massager web site is to look on the 'about' page or the sites 'contact' page.
	www.a1seek.com /massagers/super-low-frequency-massager.htm (340 words)

	Frequency Spectrum (Police Traffic Radar Handbook)
		The Federal Communications Commission (FCC) regulates frequency use by setting specifications for transmit frequency, power, bandwidth, modulation, and location, to name a few, and requires a license for many uses.
		Frequency tolerance for Ka band radars typically ±100 MHz.
		In the early days of radio it was easier to measure wavelength than frequency.
	copradar.com /preview/xappA/xappA.html (241 words)

	idx
		TaiTien is proud to announce the development of a wide frequency range SMD type XO (Crystal Oscillator).
		By utilizing the AT-cut quartz crystal blank, the frequencies versus temperature characteristics are vastly improved over a wide temperature range as compared to a Tuning Fork quartz crystal blank.
		Frequency stabilities(*) of ¡À25 or ¡À50 ppm (-40¡æ ~ +85¡æ) or ¡À20 or ¡À25 ppm (-20¡æ ~ +70¡æ) including 10-year aging are available.
	www.taitien.com.tw /english/news/news5.htm (163 words)

	MIXING: The Art of Sonic Translation
		Near Field monitors have a low-frequency limit and while super low frequencies may be omnidirectional, I wanted full range from a stereo pair.
		The response curves for the Sennheiser e-609 dynamic cardioid microphone are typical of a directional microphone's low frequency proximity effect.
		Untreated, all rooms exhibit low frequency build-up in the corners that is reflected back to the listening area causing destructive cancellation.
	www.tangible-technology.com /articles/loudness/bassmanage.htm (1571 words)

	Radio frequency - Gurupedia
		Radio frequency, or RF, refers to that portion of the
		electromagnetic radiation, until the atmosphere becomes transparent again in the so-called infrared and optical window frequency ranges.
		Electrical connectors designed to work at radio frequencies are known as RF connectors.
	www.gurupedia.com /r/ra/radio_frequency.htm (154 words)

	The Straight Dope Mailbag: We know about UHF and VHF; do they have Regular Frequency?
		There were 9 band numbers allocated by the commission, each band with a frequency 10 times as high as the previous one.
		Above that, the frequencies are unassigned, and they include infrared, visible light, UV rays, X-rays, and gamma rays as you go up the scale.
		Below the assigned frequencies, you have Extremely Low Frequency from 30-300 hertz, used mainly for submarine communication, and the frequency from 300-3000 Hz, which was thankfully declared unsuitable for long-distance broadcast, except when you shout really loud.
	www.straightdope.com /mailbag/muhf.html (601 words)

	OpTex Products Canon XL-1S (Site not responding. Last check: 2007-10-03)
		When used with an optional EF mount adapter, this system allows the camcorder to utilize a range of Canon's extensive line-up EF lenses for EOS 35mm cameras - and the possibilities with the XL1S are greater than ever before.
		By optimizing the central portion of the camera head, which handles small level signals in CCD peripheral circuit, top-class horizontal resolution for worldwide DV standards is realized.
		SuperRange goes one step further than other optical image stabilizers, by examining the image after it is received by the CCD and detecting any low-frequency vibrations missed by the gyro.
	www.optexint.com /sales/cameras/xl1s.html (482 words)

	Search Results Page
		Super quality constant directivity horn tweeter with 90° dispersion angle and heavy duty magnet structure.
		The APT high-power super tweeter possesses extraordinary sensitivity thanks to a phenolic diaphragm, which has unique properties of stiffness and damping.
		By fluid cooling the voice coil, increased power handling, and controlled low frequency behavior.
	www.partsexpress.com /webpage.cfm?webpage_id=3&SO=2&&DID=7&CATID=49&ObjectGroup_ID=455 (285 words)

	Super low frequency (Site not responding. Last check: 2007-10-03)
		It uses material from the Wiktionary page "Super".
		Jim Caviezel, his father James and brother Tim look ready to leap into the room and start playing hoops at any moment.
		News on Frequency continually updated from thousands of sources around the net.
	www.serebella.com /encyclopedia/article-Super_low_frequency.html (379 words)

	idx
		This is a medium to high frequency low noise TCXO.
		It is a low cost low power options for applications where a typical TCXO does not meet the requirements and an OCXO is more than needed.
		Based on advanced OCXO technology, the GDOX 2000 can provide precise time and frequency output that can be used as a synchronization source for all offices level in a telecommunication network.
	www.taitien.com.tw /english/news/news-main.htm (1162 words)

	Definition of Communication with submarines
		Apparently, both the American and the Russian Navy have placed communication-by-sound equipment in the seabed of areas frequently travelled by their submarines and connected it by submarine communications cables to their land stations.
		Second, on such low frequency, information can be transmitted only very slowly, on the order of a few characters per minute (see Shannon's coding theorem).
		Although the actual codes used are of course secret (well, their meaning only—the actual transmissions can be received all over the world and even some radio amateurs do listen) it is reasonable to assume that no specific orders are given but rather only commands like "surface and await orders by satellite radio."
	www.wordiq.com /definition/Communication_with_submarines (947 words)

	Streem Speakers \| SW-10 Low Frequency Powered Subwoofer
		The SW-10 low frequency powered subwoofer is capable of reproducing sound as low as 30 Hz.
		Positioned properly within a home theater setup, preferably in the corner of a room, a "sub" will emanate throughout the room evenly so you will feel the action surround you.
		Although a subwoofer is not always necessary in every home theater setup we firmly believe that it is always a welcome addition and can only enhance your experience.
	www.streemspeakers.com /sw-10.asp (163 words)

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