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Topic: Medium frequency

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	Frequency and Period of a Wave
		The quantity frequency is often confused with the quantity period.
		Mathematically, the period is the reciprocal of the frequency and vice versa.
		As the frequency of a wave increases, the period of the wave ___________.
	www.glenbrook.k12.il.us /gbssci/phys/Class/waves/u10l2b.html (1138 words)

	The Physics Classroom
		The frequency of a wave is measured as the number of complete back-and-forth vibrations of a particle of the medium per unit of time.
		And of course the frequency at which each particle vibrates is the same as the frequency of the original source of the sound wave.
		When two sounds with a frequency difference of greater than 7 Hz are played simultaneously, most people are capable of detecting the presence of a complex wave pattern resulting from the interference and superposition of the two sound waves.
	www.physicsclassroom.com /Class/sound/U11L2a.html (1275 words)

	KN4LF 160 Meter Radio Propagation Theory Notes
		a.) Medium frequencies encompass 300 to 3000 kc.
		Unfortunately medium frequencies fall within or very near the electron gyro-frequency which is in the approximate range of 630 to 1630 kHz and of course the AM broadcast band and 160 meter band is very close to these electron gyro frequencies.
		Medium frequency communication depends on the refraction of signals from the higher E and F2 layers and these signals must travel through the D layer at least twice.
	www.kn4lf.com /kn4lf8.htm (9345 words)

	Pitch and Frequency
		The frequency of a wave is measured as the number of complete back-and-forth vibrations of a particle of the medium per unit of time.
		And of course the frequency at which each particle vibrates is the same as the frequency of the original source of the sound wave.
		When two sounds with a frequency difference of greater than 7 Hz are played simultaneously, most people are capable of detecting the presence of a complex wave pattern resulting from the interference and superposition of the two sound waves.
	www.glenbrook.k12.il.us /gbssci/phys/Class/sound/u11l2a.html (1283 words)

	A Discussion of the Madison Protocols for Medium Frequency Stimulation - Introduction \| Joseph Ventura Jr., DC
		Medium frequency stimulation range is between 1kHz (1,000) and 100 kHz (100,000).
		For the purpose of the Moreno-Aranda and Seireg study, a medium frequency sine generator capable of generating a sinusoidal carrier wave between 500-10,000 Hz and modulated between 10-500 Hz was used.
		The original work of Nemec in superimposing two medium frequency currents of equal amplitude but different frequencies was to determine the viability of creating a beat frequency deep in the tissues.
	www.chiroweb.com /archives/12/19/18.html (1336 words)

	Continuous wave medium frequency signal transmission survey procedure for imaging structure in coal seams - Patent ...
		Because of the high frequency of the radar, it is exceedingly useful in investigating the geological structure in near proximity to the borehole.
		Thus for the 520 kHz transmission frequency of the preferred embodiment, the wavelength in coal is 97.7 meters.
		Attenuation rates are determined by propagating the medium frequency signals from the transmitter 20 to the receiver 10, and a backplane and/or reconstruction algorithm may be used to analyze the resulting data.
	www.freepatentsonline.com /4577153.html (8285 words)

	Technologies - Medium-frequency transformer
		The medium frequency transformer is inherently multi-system operable.
		The medium frequency transformer could be produced in series some time between 2005 and 2010.
		The small dimensions of medium frequency transformers are ideally fitted for EMUs because of limited build-in space.
	www.railway-energy.org /static/Medium_frequency_transformer_25.php (889 words)

	With Radio Ads - Which Is More Important...Reach or Frequency? (Site not responding. Last check: )
		On the face of it, reminding is a perfect job for Radio, but not when used as a frequency medium.
		Frequency - contacting one consumer three times with a message, is not as good as reach - contacting three consumers once, because that one consumer is far less likely to need the product than any of the three would be.
		Radio is largely ignored because it is thought of as a frequency medium.
	www.audiowharf.com /ad_frequency.html (1297 words)

	The Physics Classroom
		That doesn't mean he spends 24 hours on the stool, it merely means that it takes 24 hours before he must return to the stools to repeat the daily cycle (of course, this assumes that a trip to the stools is a periodic event for that teacher).
		A wave can vibrate back and forth very frequently, yet have a small speed; and a wave can vibrate back and forth with a low frequency, yet have a high speed.
		The frequency of rotation of a second hand on a clock is _______.
	www.physicsclassroom.com /Class/waves/U10L2b.html (1143 words)

	[No title]
		In order to prevent extreme modulations and resulting overflows beyond the frequency limits, amplitude and frequency deviations limiters should be connected on each voice channel in such a way that they cannot be disabled and should be used constantly.
		On the voice frequency channels, lowpass filters that achieve an attenuation level of at least 30 dB for amplitude in accordance with amplitude of 15 kHz, for frequencies between 19-100 kHz should be used.
		For this measuring, an experimental signal consisting of synch pulses and a variable frequency with 0,65 V p-p amplitude, from peak to peak, shall be applied.
	www.kktcyyk.org /Statutes.doc (3251 words)

	radio navigation overview
		As the frequency increases, the wavelength of the vibration shortens, and the number of collisions between the free electrons and gas molecules decreases.
		As the frequency increases, it is found that the amount of refraction decreases until a frequency is reached where the signals pass through the layer and on to the next.
		As the frequency is increased further the signal is refracted less and less by the E layer and eventually it passes right through.
	www.pilotfriend.com /training/flight_training/nav/rad_nav_overview.htm (4520 words)

	KN4LF Medium Frequency Radio Propagation Theory Notes
		As a medium frequency RF signal traverses Earth's magnetic lines of force in a perpendicular manner on high and mid latitude paths say between W3 land and SM, higher angle horizontally polarized signals are more readily absorbed then lower angle vertically polarized signals.
		Unfortunately medium frequencies fall within or very near the electron gyro-frequency which is in the approximate range of 630 to 1630 kHz and of course the AM broadcast band and 160 meter band is very close to these electron gyro-frequencies.
		The closer a transmitted a medium frequency carrier or sideband wave frequency is to the electron gyro-frequency, the more energy that is absorbed by the gyro electrons from that carrier wave frequency.
	www.k1ttt.net /technote/kn4lf/kn4lf8.html (7778 words)

	Topic Summaries: Waves & Optics
		Frequency (ƒ) is the number of cycles of a repeating sequence of events in a unit interval of time.
		Wavelength is inversely proportional to frequency (λ ∝ 1 / ƒ).
		White light is a mixture of visible frequencies of electromagnetic radiation whose appearance approximates that of a flbody radiator with its peak wavelength in the middle of the visible spectrum.
	hypertextbook.com /physics/waves/summary.shtml (4400 words)

	System for detecting the passage of a mobile including a passive responder (US5451941)
		Both circuits have radiating circuits which are tuned and the low frequency signal generated in the low frequency circuit is used to short-circuit the medium frequency tuned circuit of the responder, at the rate of low frequency rate.
		a low frequency transmitter and a medium frequency transmitter both designed to operate continuously, said transmitters having respective antennas arranged to transmit towards a zone having a predetermined location relative to the respective antennas which is selected for the responder to pass through it during displacement of the mobile, and
		said interrogation assembly is arranged to be responsive to disturbances of the medium frequency transmitter caused by the short-circuiting of the medium frequency tuned radiating circuit of the responder.
	www.delphion.com /details?pn10=US05451941 (373 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.
		Frequencies from 216 to 450 MHz were sometimes called P-band: Previous, since early British Radar used this band but later switched to higher frequencies.
	en.wikipedia.org /wiki/Radio_frequency (467 words)

	Theoretical Principles of Plasma Physics and Atomic Physics
		Collision Frequency: The concept of a collision frequency is probably the most important one in plasma physics (and the physics of gases in general) when it comes to assessing the significance of the individual physical processes.
		Larmor Frequency: The period of revolution of a charge q with mass m on its Larmor circle in the magnetic field B is characterized by the Larmor frequency
		Radiative Transfer: Unless the optical depth of the medium is much smaller than 1, radiative transfer effects due to scattering and absorption of the radiation are crucially important for the correct interpretation of observed intensities and spectral shapes.
	www.plasmaphysics.org.uk (8070 words)

	Medium Wave Circle - Antenna advice
		Antenna impedance rises as frequency falls, and taking as example a figure of 2000 ohms at IMHz, this would be grossly shunted and noise modulated by direct connection to any low impedance cable feeding into a domestic environment.
		This is a radio frequency phase shifting and amplitude adjusting arrangement that controls one feeder signal with respect to the other by plus to minus ninety degrees, and each individually from maximum level to zero.
		Medium wave reception changes hourly, daily, monthly, annually and every eleven years, so arm yourself with a log book, UTC clock, calendar, copy of- the World Radio and TV Handbook, monthly sunrise/sunset charts., plus a permanently connected cassette recorder with electro-mechanical time switch.
	www.mwcircle.org /res-antenna.htm (6818 words)

	Crystal and frequency control glossary - M
		In radio transmission using reflection from the regular ionized layers of the ionosphere, the upper frequency limit that can be used for transmission between two points at a specified time.
		A frequency specified as "10.0 MHz" would be understood as being a frequency of 10,000,000 Hertz (cycles per second).
		This is a one-way, domestic public radio service broadcast on microwave frequencies from a fixed station that transmits (usually in an onmidirectional pattern) to multiple receiving facilities located at fixed points.
	www.icmfg.com /crystalglossarym.html (773 words)

	HF and Lower Frequency Radiation - Introduction
		The environmental factors affecting these frequencies primarily deal with what is going in the upper reaches of the atmosphere, a region called the ionosphere.
		The reason for this confusing nomenclature is because when the EM spectrum bands were first named in the early part of the 20th century, most of the radio communications were centered around the MF (Medium Frequency) band and in relation to this, HF radiation was relatively high frequency.
		The actual frequency used within the HF band for skywaves depends on the properties of the ionosphere, which are highly variable.
	www.weather.nps.navy.mil /~psguest/EMEO_online/module3/module_3_1.html (1661 words)

	Bandwidth Signal Mediums
		The higher the RF frequency, the less it will be affected by the environment and the more information it can carry.
		With the frequency of a 1330nm wavelength laser being 225THz, an enormous bandwidth is available.
		The best medium is for the laser to be transmitted through thin glass fibers from destination to destination.
	mysite.verizon.net /vzeq4ql8/bandwidthsignalmediums.html (395 words)

	Medium-Frequency Communications
		This small band of frequencies has been used for communications since the advent of radio.
		distress frequencies (500 kilohertz and approximately 484 kilohertz).
		Frequencies in the lower portion of the mf band (300
	www.tpub.com /content/neets/14189/css/14189_26.htm (458 words)

	Medium frequency - Wikipedia, the free encyclopedia
		Medium frequency (or MF) refers to radio frequencies (RF) in the range of 300 kHz and 3000 kHz.
		Mediumwave radio transmissions serves as the most common band for the regular AM broadcast band (which is found in this range).
		Tomislav Stimac, "Definition of frequency bands (VLF, ELF...
	en.wikipedia.org /wiki/Medium_frequency (123 words)

	Method and apparatus for detecting an abnormality within a host medium utilizing frequency-swept modulation diffusion ...
		The host medium is initially illuminated at a plurality of different positions with light of at least two different wavelengths.
		Following the propagation of the signals through the host medium, the amplitude and phase of the signals are detected and, based upon the detected signals, a shadow image can be created in which the abnormality is depicted as a suspicious region.
		Based upon at least these criteria which reflect physiological parameters of the host medium and embedded abnormalities as well as the possible comparison of the shadow images to an x-ray image of the host medium, the abnormality can be characterized.
	www.delphion.com /details?pn10=US07006676 (1280 words)

	Medium-frequency rotating joint for antenna - Patent 4908630
		The invention concerns rotating joints used to transmit medium frequency or intermediate frequency signals between a rotating antenna and its support which is fixed, and especially rotating joints used in radar antennas.
		These different frequency amplification and transposing operations are performed on the antenna itself in a part of the radar called the "R.F. head".
		For the signals to be transmitted from the "R.F. head", which is on a rotating support, to the signal processing device itself, which is placed on a fixed support at a certain distance from the antenna, it is necessary to provide for a rotating joint which does this transmission.
	www.freepatentsonline.com /4908630.html (2811 words)

	reach trumps frequency: how radio can build business in a ppm world. By Erwin Ephron
		Frequency— contacting one consumer three times with a message, is not as good as reach — contacting three consumers once, because that one consumer is far less likely to need the product than any of the three would be.
		Radio is largely ignored because it is thought of as a frequency medium.
		Strange as this may seem, Radio’s reputation as a frequency medium probably grows more out of how well it targets, than from any reach limitations.
	www.ephrononmedia.com /article_archive/articleViewerPublic.asp?articleID=141 (1489 words)

	medium frequency definition - Dictionary - MSN Encarta
		medium frequency definition - Dictionary - MSN Encarta
		Search for "medium frequency" in all of MSN Encarta
		radio frequency: a radio frequency lying between 300 and 3,000 kilohertz
	encarta.msn.com /encnet/features/dictionary/DictionaryResults.aspx?refid=1861693493 (51 words)

	Furnaces manufacturer and suppliers india
		Medium frequency units can give a strong stirring action resulting in a homogeneous melt.
		Medium frequency Furnaces operate at frequencies ranging from 150 To 10,000 HZ, such furnaces provide the concentration of high power in small volumes with a definitely higher melt rate.
		Converts the line/mains frequency in to medium frequency required for efficient operation.
	www.magnalenz.com /product.html (547 words)

	CB Radio Operation
		Some radio frequencies easily penetrate the thickness of a forest, yet other radio frequencies can be blocked by a single leaf.
		Sky-waves on medium frequencies and high frequencies take a remarkable skip off of the ionosphere that circles our planet at altitudes of 50 to 250 miles.
		If the hop back to earth is strong enough and lands in the very conductive ocean, that medium frequency or high frequency wave takes a double hop - sometimes a triple hop - and literally skips around the world.
	home.att.net /~wizardoz/cbmw/rwpropag.html (1267 words)

	MF TRF Receiver
		The design goals were to build a Tuned Radio Frequency broadcast band receiver with one RF amplifier, a high performance detector and a simple, headphone-level audio stage.
		I built a separate voltage divider with roughly the same V bias consisting of a 68K and a 15K resistor and swapped it for the 470K and 100K pair.
		Interestingly, the 470 K and 100K pair had better low frequency response and slightly higher sensitivity than the 68K and 15K voltage divider.
	www.qrp.pops.net /tf2.asp (2797 words)

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