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Topic: Superheterodyne

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	Superheterodyne Receivers
		Thus, the 850 kHz is superheterodyned to 452 kHz.
		The superheterodyne receiver mixes both signals with 398 kHz to produce the desired signal at 452 kHz and the interference at 465 kHz.
		Superheterodyne receivers reduce the signal frequency be mixing in a signal from a local oscillator to produce the intermediate frequency (IF).
	www.fas.org /man/dod-101/navy/docs/es310/superhet.htm (1244 words)

	What is superheterodyne? - a definition from Whatis.com - see also: superhet
		The term superheterodyne refers to a method of designing and buildingwireless communications or broadcast equipment, particularly radio receivers.
		Numerous books are devoted to this topic; some engineersmake their entire living designing oscillators, mixers, and amplifiers that use thistechnology.
		For more information about superheterodyne engineering practice, aprofessional-level textbook or a formal course is recommended.
	whatis.techtarget.com /definition/0,,sid9_gci334163,00.html (395 words)

	Superhet or Superheterodyne Radio Receiver :: Radio-Electronics.Com
		The superhet radio or to give it its full name the superheterodyne receiver is one of the most popular forms of receiver in use today.
		In the superhet or superheterodyne radio, the received signal enters one input of the mixed.
		However the basic superheterodyne concept remains the same, using the idea of mixing the incoming signal with a locally generated oscillation to convert the signals to a new frequency.
	www.radio-electronics.com /info/receivers/superhet/superhet.php (1330 words)

	Superheterodyne receiver in TutorGig Encyclopedia
		The superheterodyne principle was originally conceived by Edwin Armstrong during World War 1 as a means of overcoming the deficiencies of early vacuum triodes used as high-frequency amplifiers in radio direction finding (RDF) equipment.
		In a Triode RF amplifier, if both the plate and grid are connected to resonant circuits tuned to the same frequency, stray capacitive coupling between the grid and the plate will cause the amplifier to go into oscillation if the stage gain is much more than unity.
		This was rapidly followed by the introduction of low-cost multi-element tubes specifically designed for superheterodyne operation and by the mid-30s the TRF technique was rendered obsolete.
	www.tutorgig.com /ed/Superheterodyne_receiver (1337 words)

	RCA
		Instead of relying on selecting and amplifying the signal at the incoming broadcast frequency, by means of circuits which must be adjusted to that frequency, the superheterodyne changes the broadcast frequency to a lower, fixed frequency where it can be amplified and unwanted frequencies eliminated much more efficiently.
		Thus in the 1930 superheterodyne there are two tuned circuits ahead of the first tube.
		The Radiola superheterodyne is indicative of the truth of this statement.
	www.antiqueradios.org /gazette/rca.htm (1885 words)

	Superheterodyne Receivers - Microwave Encyclopedia - Microwaves101.com (Site not responding. Last check: )
		A superheterodyne receiver contains a combination of amplification with frequency mixing, and is by far the most popular architecture for a microwave receiver.
		The word "superheterodyne" is often hyphenated to "super-heterodyne".
		The superheterodyne receiver is still the most popular microwave receiver, and it was invented more than eighty-five years ago (patented in 1918).
	www.microwaves101.com /encyclopedia/receivers_superhet.cfm (1527 words)

	Introduction to the Superheterodyne Receiver
		The principle of operation in the superheterodyne is illustrated by the diagram in Figure 4.
		One problem, which has to be contended with in the superheterodyne receiver, is its ability to pick up a second or imago frequency removed from the signal frequency by a value equal to twice the intermediate frequency.
		To summarise the material, we have looked at the basic superheterodyne receiver and various factors which must be considered in its design such as, the choice of intermediate frequency, the function of the RF amplifier, oscillator tracking and tuning stability.
	users.tpg.com.au /ldbutler/Superhet.htm (6341 words)

	Superheterodyne receiver Information - ic superheterodyne receiver
		Super Heterodyne receivers "beat" or heterodyne a frequency from a local oscillator (within the receiver) with introduction to superheterodyne receiver the incoming signal.
		In practice not every superheterodyne receiver design will have all these elements, nor does this convey the complexity of other designs, but the essential elements of a local oscillator and a mixer followed by a filter and IF amplifier are common how does superheterodyne receiver works to all superhet circuits.
		Only the front end (the part block diagram of superheterodyne receiver before the frequency converter stage) needs to be sensitive to a wide frequency range.
	www.inanot.com /Ina-Electronics_Topics_Sk_-_Sy-/Superheterodyne_receiver.html (674 words)

	Chapter 4 - Superheterodyne Radio Receivers
		The superheterodyne receiver is, however, also more complex than the TRF, and setting of its stages during its production requires some special instruments, that the average radio amateur does not possess.
		The main problem in making a superheterodyne device is not the circuitry complexity but its setup, which requires lot of practical experience and some special instruments, that our readers probably don't possess.
		The electronic diagram of the simplest superheterodyne AM receiver in the world, with reproduction over the loudspeaker, is shown on Pic.4.2-c.
	www.mikroe.com /en/books/rrbook/chapter4/chapter4a.htm (3053 words)

	Phase-Locked Loop Tutorial, PLL
		Among his principal contributions were regenerative feedback circuits, the superheterodyne radio receiver, and a frequency-modulation radio broadcasting system.
		However, because of the number of tuned stages in a superheterodyne, a simpler method was desired.
		Although the synchronous, or homodyne, receiver was superior to the superheterodyne method, the cost of a phase-locked loop circuit outweighed its advantages.
	www.uoguelph.ca /~antoon/gadgets/pll/pll.html (3369 words)

	Integrated CMOS Transceivers for Wireless Communications
		The superheterodyne architecture is the most widely used architecture for wireless receivers.
		First problem with integrated implementation of conventional superheterodyne receiver is the need for high-Q, low noise, low distortion bandpass IF filters (70-100 MHZ for 900 MHz receivers, for example), which is, unfortunately, well beyond the capabilities of current low-power integrated filter technologies.
		This approach is similar to a superheterodyne receiver architecture in that the frequency translation is accomplished in multiple steps.
	www.stanford.edu /~sols/course_projects/EE359proj.shtml (6080 words)

	RCA Radiola page1 (Site not responding. Last check: )
		The invention of the Superheterodyne Radio Receiver is attributed to Edwin H. Armstrong in 1918, whilst he was posted in France in WW1.
		The superheterodyne works on the basis of converting a high incoming radio frequency carrier to a lower intermediate radio frequency.
		The superheterodyne principle is now universal and used by almost all radio devices manufactured since the 1930's.
	www.geocities.com /tysye/radiola1.html (271 words)

	Department of Electrical Engineering
		The cost for parts to produce superheterodyne AM receiver is estimated at $66.60, while the cost per unit for construction of one thousand units is estimated at $45.77.
		The societal impact of the superheterodyne AM receiver is large, because it allows clear reception of high-frequency channels.
		Another reason for using a superheterodyne receiver is that the RF stage and local oscillator can be adjusted to be synchronously tunable, while the IF, demodulator, and audio amplifier stages can be fixed.
	www.eng.usf.edu /~baylis/EEL4936FinalReport1.htm (5383 words)

	User carried radar detector - Patent 4725840
		A superheterodyne radar detector includes a compact watertight and durable housing to which a variety of clips and fastening means may be attached.
		Radar detecting superheterodyne units are known for use in a vehicle to detect the presence of radar signals in the X-band and in the K-band which are generated by law enforcement radar units for speed detection.
		1, a superheterodyne radar detector housing is shown at 1, within which is included radar signal sensing circuitry (not shown).
	www.freepatentsonline.com /4725840.html (3278 words)

	Radio Receivers
		Draw the block diagram of a superheterodyne receiver and explain the function of each stage briefly.
		Because the detector and amplifiers of a superheterodyne receiver can be designed to amplify only intermediate frequency (IF), this type of receiver is more selective and offer high fidelity (exact reproduction quality of the transmitted signal).
		The main objective of the superheterodyne receiver is to produce an intermediate frequency (IF) by the process of heterodyning or beating.This can be accomplished when two frequencies are mixed to produce the beat frequency.
	www.qsl.net /vu2msy/receiver.htm (2227 words)

	superheterodyne receiver
		The superheterodyne receiver (or to give it its full name, the supersonic heterodyne receiver often abbreviated superhet) was invented by Edwin Armstrong in 1918.
		How to build a high quality Superheterodyne receiver from basic...
		The Superheterodyne Receiver In radio broadcasting, a transmitting antenna sends out electromagnetic waves that carry the radio program.
	www.rocky-derfilm.de /80-superheterodyne-receiver-62.htm (231 words)

	IEEEVM: The Superheterodyne Receiver (Site not responding. Last check: )
		The essential idea was to convert the high-frequency signal to one of intermediate frequency by heterodyning it with an oscillation generated in the receiver.
		Not long after RCA began licensing other manufacturers to make the superheterodyne, it became the standard type of radio receiver.
		In 1922, he introduced the super-regenerative circuit, which was widely used in special-purpose receivers, such as police radios, ship-to-shore radios, and radar systems.
	www.ieee-virtual-museum.org /collection/tech.php?taid=&id=2345790&lid=1 (426 words)

	TVTechnology - Digital TV
		In fact, all radios, television receivers, terrestrial and satellite, and all radar sets employ this superheterodyne principle, invented in 1916 by Edwin Howard Armstrong when he was serving in the U.S. Army in France.
		This is the fundamental concept of all superheterodyne receivers.
		One of these is called the zero IF superheterodyne, also known as a direct-conversion receiver.
	www.tvtechnology.com /features/digital_tv/f_charles_Rhodes.shtml (2390 words)

	Superheterodyne Receiver
		In order to receive one FM channel, its RF signal must first be separated (via filtering) from the other channels, amplified to an usable level and then demodulated.
		An effective method to achieve this, is the single conversion superheterodyne receiver [
		A block diagram of such a receiver is shown in fig.
	n.ethz.ch /student/rodonil/da/bericht/node4.html (264 words)

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