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Topic: Armstrong oscillator

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	Oscillation - Wikipedia, the free encyclopedia
		Oscillation is the periodic variation, typically in time, of some measure as seen, for example, in a swinging pendulum.
		The simplest oscillating system is a mass, subject to the force of gravity, attached to a linear spring.
		In the spring-mass system, oscillations occur because, when at the static equilibrium displacement, the mass has kinetic energy which is converted into energy stored in the spring at the extremes of its path.
	en.wikipedia.org /wiki/Oscillator (698 words)

	Lindsay's Technical Archive: Armstrong Super Regeneration
		The oscillator is tuned in both circuits to a super-audible frequency and to attain this has a 1250 turn duo-lateral coil shunted by a mica condenser of.0025 mfds in its grid circuit, and a DL-1500 in its plate circuit.
		The amount of energy developed by the oscillator at the variation frequency, however, is sufficient to completely paralyze an audio amplifier if impressed on its grid, and a low-pass filter is necessary between the detector-oscillator and the amplifier to keep out the 12,000-cycle component and yet pass the signal frequency.
		Armstrong, when "gotten onto," make the operation of a super-regenerative set as easy as the ordinary regenerative circuit with which we are all familiar.
	www.lindsaybks.com /arch/sreg (1642 words)

	Edwin Howard Armstrong (Site not responding. Last check: 2007-10-21)
		Armstrong is the most important figure on this list, and one of great engineers of the 20th century.
		Armstrong discovered that the gain of a triode amplifier could be enormously increased by feeding some of the amplifier output back into the input, i.e.
		Armstrong's insight was that an FM signal didn't have to have a narrow range of frequencies.
	world.std.com /~jlr/doom/armstrng.htm (2524 words)

	LC Oscillators
		This oscillator consists of a capacitor and a coil connected in parallel.
		This oscillator is very similar to the Armstrong oscillator and is commonly used.
		The difference between the Armstrong oscillator and the Hartley oscillator is that the tickler coil is part of the LC circuit.
	www.electronixandmore.com /articles/oscillators.html (1219 words)

	Armstrong (tickler) oscillator - Wikipedia, the free encyclopedia
		The Armstrong oscillator is an oscillator used to produce a sine-wave output of constant amplitude and of fairly constant frequency within the rf range.
		It is generally used as a local oscillator in receivers, as a source in signal generators, and as a radio-frequency oscillator in the medium- and high-frequency range.
		The oscillator was name after its inventor Edwin Armstrong.
	en.wikipedia.org /wiki/Armstrong_%28tickler%29_oscillator (94 words)

	OSCILLATORS
		Oscillators are classified according to the waveshapes they produce and the requirements needed for them to produce oscillations.
		In an oscillator, a portion of the output is fed back to sustain the input, as shown in figure 2-1.Enough power must be fed back to the input circuit for the oscillator to drive itself as does a signal generator.
		For an RC phase-shift oscillator, the amplifier is biased for class A operation to minimize distortion of the wave or signal.
	www.tpub.com /neets/book9/35.htm (1571 words)

	Oscillation Article, Oscillation Information (Site not responding. Last check: 2007-10-21)
		Oscillations occur not only in physical systems but also in biological systems and in human society.Oscillations are the origin of the sensation of musical tone.
		The harmonic oscillator offers a model of many morecomplicated types of oscillation and can be extended by the use of Fourier analysis.
		The apparent motions of the individual oscillations typically appears very complicatedbut a more economic, computationally simpler and conceptually deeper description is given by resolving the motion into normal modes.
	www.anoca.org /systems/system/oscillation.html (695 words)

	chet_paynter_introduct_6\|Oscillators\|Chapter Summary
		The Colpitts oscillator is a discrete LC oscillator that uses a pair of tapped capacitors and an inductor to produce regenerative feedback.
		The Hartley oscillator is similar to the Colpitts except that it uses a pair of tapped coils instead of two tapped capacitors.
		The key to the operation of a crystal-controlled oscillator is the piezoelectric effect, which means that the crystal vibrates at a constant rate when it is exposed to an electric field.
	wps.prenhall.com /chet_paynter_introduct_6/0,5779,426330-,00.html (2466 words)

	Phase-Locked Loop Tutorial, PLL
		Edwin Howard Armstrong is widely regarded as one of the foremost contributors to the field of radio-electronics.
		When the input signal and the local oscillator were mixed at the same phase and frequency, the output was an exact audio representation of the modulated carrier.
		To counteract this frequency drift, the frequency of the local oscillator was compared with the input by a phase detector so that a correction voltage would be generated and fed back to the local oscillator, thus keeping it on frequency.
	www.uoguelph.ca /~antoon/gadgets/pll/pll.html (3380 words)

	Tuned-base Armstrong oscillator
		The operation of the Armstrong oscillator is basically this: Power applied to the transistor allows energy to be applied to the tank circuit causing it to oscillate.
		The Armstrong oscillator is an example of how a class C amplifier can produce a sine-wave output that is not distorted.
		The two versions of this oscillator are the series-fed and the shunt-fed. The main difference between the Armstrong and the Hartley oscillators lies in the design of the feedback (tickler) coil.
	www.tpub.com /neets/book9/35d.htm (1909 words)

	Communications Engineering & Design - 2/2004: CICIORA'S CORNER (Site not responding. Last check: 2007-10-21)
		Prior to Armstrong’s oscillator, radio transmitters were devices with a spark gap for wireless telegraphy or specialized, mechanical rotating machinery, a high-speed generator for transmitting audio signals using amplitude modulation.
		Armstrong’s oscillator not only made the transmitter more controllable and less costly, it allowed operation at much higher frequencies.
		Armstrong began work on frequency modulation in 1924 and demonstrated it after a decade of long hours and hard work in 1933 to Sarnoff.
	www.cedmagazine.com /ced/2004/0204/02cic.htm (972 words)

	Who Invented the Superheterodyne? (Site not responding. Last check: 2007-10-21)
		Later a local oscillator was substituted for one of the transmitter-receiver combinations and the heterodyne as we know it was born.
		Armstrong's problem was immediate— the German army was rumored to be using very short waves for front-line communication, waves too short to be picked up on the French receivers.
		Armstrong himself termed his new circuit "the Rolls Royce method of reception" and, as with the automobile, the superheterodyne attracted many patrons precisely because of its expense and complexity.
	antiqueradios.com /superhet (7468 words)

	Phase-locked loop - Unipedia
		Since the local oscillator would rapidly drift in frequency, an automatic correction signal was applied to the oscillator, maintaining it in the same phase and frequency as the desired signal.
		These oscillators also have larger tuning ranges than the other kinds, which improves yield and is sometimes a feature of the end product (for instance, the dot clock on a graphics card which drives a wide range of monitors).
		the input to the PLL is $x_c(t), the output of the voltage-controlled$ oscillator (VCO) is $x_r(t), the output of the phase detector is x_m(t) .$
	www.unipedia.info /PLL.html (2762 words)

	Electronics 16
		The simplest crystal oscillator is the Pierce oscillator, shown in the figure on the left.
		The amplitude of oscillation at the drain was 24 V with R = 1k, the RF voltage across the choke reversing in direction during the cycle.
		Other oscillators are discussed on other pages, for example The VTVM and GDO, where the grid-dip oscillator is studied, and Vacuum Tubes, where local oscillators for superheterodynes are presented.
	www.du.edu /~etuttle/electron/elect16.htm (2560 words)

	Tracking Advances In VCO Technology - Maxim/Dallas
		Armstrong's discovery was soon improved upon by Rober V.L. Hartley, with the invention of his oscillator circuit topology (Figure 1).
		The frequency of oscillation was established by the coil inductance and the circuit capacitance.
		With a variable-frequency oscillator is was possible to tune the frequency translation circuit to a wide range of input RF signals and therefore enable multichannel communications, such as amplitude-modulated (AM) radio.
	www.maxim-ic.com /appnotes.cfm?an_pk=1768 (2999 words)

	Oscillator Circuits & Projects (Site not responding. Last check: 2007-10-21)
		Oscillator circuits usually are not taught at technology and engineering schools and universities.
		Oscillator Circuits & Projects was written as a textbook and project book for individuals who need to know more about oscillator circuits.
		Complete information about oscillator circuits is presented in an easy-to-follow manner with many illustrations to help guide you through the theory stage to the hands-on stage.
	web.idirect.com /a1parts/public/oscillator_circuits.html (318 words)

	Voltage controlled oscillators (Site not responding. Last check: 2007-10-21)
		An oscillator is an inherently unstable system that switches from oneunstable state to another (and back to the original state) at a given rate.
		A voltage-controlled oscillator (VCO) uses a voltage to vary the rate of oscillation.
		An example of a VCO is a 2nd-order LC (Inductor - Capacitor) tuned tank (filter) circuit, which oscillates at the resonant frequency of the tank.
	www.therfcc.org /voltage-controlled-oscillators-240418.html (161 words)

	[No title] (Site not responding. Last check: 2007-10-21)
		armstrong oscillator An oscillator that uses an isolation transformer to achieve positive feedback from output to input.
		crystal-controlled oscillator Oscillator that uses a quartz crystal in its feedback path to maintain a stable output frequency.
		This oscillator uses a quartz crystal in place of the inductor found in the colpitts oscillator feedback network.
	lacyg.box.sk /glos/elektro (14312 words)

	BAMTRAT - Technical walk-through
		The volume oscillator is set up such that it is normally at or near resonance, resulting in a large negative voltage, and reducing the gain to minimum.
		It's a pretty standard Armstrong oscillator topology, using the original antenna coil as the tank, and the original oscillator section of the tuning capacitor in parallel with an experimentally selected padding cap C
		Except for the coil/capacitor swap, the fixed pitch oscillator is virtually identical to the original local oscillator circuit in the AM radio.
	www.dogstar.dantimax.dk /theremin/bamttech.htm (1291 words)

	WirelessMike homepage (Site not responding. Last check: 2007-10-21)
		Edwin Howard Armstrong was a man of creativity, perseverance and honor, an inspiration for the generations of engineers who would follow.
		He was the inventor of many of the basic building blocks of radio that are now taken for granted: including the oscillator, amplifier, continuous-wave transmitter, superregenerative receiver, superheterodyne receiver, and FM.
		Armstrong took radio from primitive, unreliable morse code to high-fidelity FM broadcasting.
	www.wirelessmike.com /armstrong.html (288 words)

	Armstrong oscillator -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-21)
		Armstrong oscillator -- Facts, Info, and Encyclopedia article
		The Armstrong Oscillator is named for (additional info and facts about Edwin Armstrong) Edwin Armstrong, its inventor.
		This circuit is the basis of the (additional info and facts about Regenerative Receiver) Regenerative Receiver.
	www.absoluteastronomy.com /encyclopedia/a/ar/armstrong_oscillator.htm (103 words)

	[No title]
		In the spring-mass sytem, oscillations occur because, when at the static equilibrium displacement, the mass has kinetic energy which is converted into
		The harmonic oscillator offers a model of many more complicated types of oscillation and can be extended by the use of
		The apparent motions of the individual oscillations typically appears very complicated but a more economic, computationally simpler and conceptually deeper description is given by resolving the motion into
	en-cyclopedia.com /wiki/Vibration (780 words)

	[No title] (Site not responding. Last check: 2007-10-21)
		I had expressed some concern about obtaining the specified coil forms but upon further inspection, there seems to be no reason why air would coils wouldn't work just as long as the three stages are properly shielded from each other.
		The second coil is used in the oscillator portion of the converter tube.
		Being an Armstrong style oscillator design, this coil too should be easy to duplicate and tune but, I would imagine that it would not be possible to achieve an oscillator stable enough to copy cw on 20 meters.
	www.mines.uidaho.edu /ftp/pub/Glowbugs/GBdigests/glo-por.047 (383 words)

	Re: VTTC - audio modulation
		I would expect any rf oscillator to be capable of being modulated linearly, regardless of its class of bias.
		Modulating an oscillator in the normal course of events is considered bad practice, but only because when this is done the frequency usually shifts a bit.
		As you correctly surmise when modulating an oscillator, it all depends on how seriously the oscillations are disturbed.
	www.pupman.com /listarchives/2001/May/msg00864.html (882 words)

	Armstrong oscillator (Site not responding. Last check: 2007-10-21)
		The frequency of oscillation is determined by the tank circuit (L and C in the illustration).
		Too many cyclists form beginners to pros are constantly looking for that magic workout of secret training plan that will make them the next superstar.
		Lance Armstrong is a true American hero- his fifth time win of the Tour de France was not well celebrated- other World Events took first page.
	www.freeglossary.com /Armstrong_oscillator (476 words)

	Armstrong Oscillator (Site not responding. Last check: 2007-10-21)
		See Oscillstor (disambiguation) for particular types of oscillation and Oscullator s.
		The term vibration is sometimes used more narrowly to mean a mechanical oscillation but sometimesis used to be synonymous with oscillation.
		Commonly appearing connections are : Armstrong Piccolo, Armstrong Piccolos, Armstrong Pickups, Armstrong Redwoods, Armstrong Ringsted, Armstrong S, Armstrong Saddlery, Armstrong School, Armstrong School District, Armstrong Separation, Armstrong Shank, Armstrong Solarian, Armstrong Solarium, Armstrong Sperry, Armstrong State, Armstrong Steam, Armstrong Steam Traps, Armstrong Strainer, Armstrong Strainers, Armstrong Sundial
	www.bodawg.com /point/16392-armstrong-oscillator.html (344 words)

	ARMSTRONG OSCILLATOR
		increase in the oscillating frequency, and an increase in emitter voltage causes a decrease in the
		The ARMSTRONG OSCILLATOR is used to produce a sine-wave output of constant amplitude and
		The identifying characteristics of the Armstrong oscillator are that (1) it uses an LC tuned circuit to
	www.tpub.com /content/neets/14181/css/14181_77.htm (347 words)

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