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Topic: Superheterodyne receiver

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Radio receiver

Frequency synthesiser

Tuned radio frequency receiver

Heterodyne

Amplitude modulation

Q factor

Radiotelephone

Electronic selectivity

Regenerative circuit

Automatic gain control

Tuner

Edwin Armstrong

TRF

Electronic oscillator

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	NationMaster.com - Encyclopedia: Superheterodyne (Site not responding. Last check: 2007-11-07)
		Superheterodyne receivers reduce the signal frequency be mixing in a signal from a local oscillator to produce the intermediate frequency (IF).
		A double superheterodyne receiver having a single local oscillator which supplies a signal of a predetermined frequency to a second frequency converter or mixer, where a second intermediate frequency signal is produced for final detection.
		For multichannel reception by this type of receivers, therefore, the output signal (the second intermediate frequency signal) from the second frequency converter is required to have a constant frequency of, for example, 455 kHz regardless of the frequency of the incoming modulated radio frequency signal.
	www.nationmaster.com /encyclopedia/Superheterodyne (808 words)

	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 have better performance because the components can be optimized to work a single intermediate frequency, and can take advantage of arithmetic selectivity.
	www.fas.org /man/dod-101/navy/docs/es310/superhet.htm (1244 words)

	Superheterodyne receiver - Wikipedia, the free encyclopedia
		The superheterodyne receiver (or to give it its full name, the supersonic heterodyne receiver – usually these days shortened to superhet) was invented by Edwin Armstrong in 1918.
		Tuned radio frequency (TRF) receivers suffered from poor frequency stability, and poor selectivity, as even filters with a high Q factor have a wide bandwidth at radio frequencies.
		Heterodyne receivers "beat" or heterodyne a frequency from a local oscillator (within the receiver) with all the incoming signals.
	en.wikipedia.org /wiki/Superheterodyne_receiver (689 words)

	Superheterodyne receiver (Site not responding. Last check: 2007-11-07)
		Tuned Radio Frequency (TRF) receivers suffered from poor frequency stability, and poor selectivity, as even filter s with a high Q factor have a wide bandwidth at radio frequencies.
		Super Heterodyne receivers "beat" or heterodyne a frequency from a local oscillator (within the receiver) with the incoming signal.
		The superheterodyne receiver (or to give it its full name, the supersonic heterodyne receiver – usually these days shortened to superhet) was invented by...
	www.serebella.com /encyclopedia/article-Superheterodyne_receiver.html (1114 words)

	[No title] (Site not responding. Last check: 2007-11-07)
		Other applications of resonant transformers are as coupling between stages of a superheterodyne receiver, where the selectivity of the receiver is provided by the tuned transformers of the intermediate-frequency amplifiers.
		A superheterodyne receiver converts any selected incoming frequency by heterodyne action to a preselected common intermediate frequency, for example, 455 kilohertz or 10.7 megahertz, and provides amplification and selectivity, or filtering.
		Because the detectors are built around a superheterodyne receiver, and its local oscillator radiates a little, it is possible to build a radar detector detector detecting such emissions (usually the frequency of the radar they are detecting, plus about 10 MHz) - some police radar guns are equipped with it.
	www.worldhistory.com /wiki/S/Superheterodyne-receiver.htm (675 words)

	Radio receiver design - Wikipedia, the free encyclopedia
		The directly amplifying receiver contains the input radio frequency filter, the radio frequency amplifier (amplifying radio signal of the tuned station), the detector and the sound frequency amplifier.
		In the Direct conversion receiver the signals from the aerial pass through a band pass filter, and an amplifier before reaching a non-linear mixer where they are mixed with a signal from a local oscillator which is tuned to the carrier wave frequency of an AM or SSB transmitter.
		To make a good FM receiver a large number of RF amps which are driven into limiting are required to create a receiver which can take advantage of the capture effect, one of the biggest advantages of FM.
	en.wikipedia.org /wiki/Radio_receiver_design (575 words)

	superheterodyne receiver - Hutchinson encyclopedia article about superheterodyne receiver (Site not responding. Last check: 2007-11-07)
		The most widely used type of radio receiver, in which the incoming signal is mixed with a signal of fixed frequency generated within the receiver circuits.
		The superheterodyne system is also used in basic television receivers.
		This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.
	encyclopedia.farlex.com /superheterodyne+receiver (133 words)

	Intermodulation antiinterference device for superheterodyne receiver - Patent 4126828
		A circuit as in claim 10 where said superheterodyne receiver is a frequency modulation receiver and includes means for generating the outputs from said first and second intermediate frequency amplifying circuits prior to amplitude limitation thereof.
		This invention was devised in view of the above-mentioned facts, and its purpose is to provide an intermodulation antiinterference device for a superheterodyne receiver that detects intermodulation interference and reduces the intermodulation interference by regulating the attenuation of the attenuating circuit between the high frequency amplifying circuit and the antenna.
		When the receiver is receiving only the desired signal, the output level of first intermediate frequency amplifying circuit 6 inputted to comparison circuit 11 is greater than the output level of second intermediate frequency amplifying circuit 10, and comparison circuit 11 does not generate an output signal.
	www.freepatentsonline.com /4126828.html (3419 words)

	MM 0705, Lesson 7 (Site not responding. Last check: 2007-11-07)
		The TRF receiver is the forerunner of the superhet and suffers from several disadvantages inherent in its operation.
		The fundamental operation of the superheterodyne receiver for the reception of AM signals is as follows (figure 7-4).
		For superheterodyne reception, only the sum or difference frequency is of interest, and all other frequencies in the output of the mixer must be filtered out.
	www.oldradioz.com /electronic_course/ch7.htm (6556 words)

	Analog Devices: Analog Dialogue: High Performance Narrowband Receiver Design Simplified by IF Digitizing Subsystem ... (Site not responding. Last check: 2007-11-07)
		Receivers for these radios must be capable of accurately digitizing a low-level, high-frequency signal in the presence of large interfering signals.
		The "half-IF" problem is a specific case afflicting receivers with poor second-order linearity, in which an interferer falling halfway between the LO and the target signal generates a second-order component, which mixes with the LO's 2nd harmonic to generate a spur falling on the target signal.
		The instantaneous dynamic range of any narrow-band receiver signal chain containing a VGA is dependent on the specific gain setting of the VGA, since the ratio of noise that is contributed by each stage in the signal path to the "overall" input-referred noise decreases as the gain of the preceding stage increases.
	www.analog.com /library/analogDialogue/archives/35-03/AD9870 (2222 words)

	Superheterodyne receiver: Facts and details from Encyclopedia Topic (Site not responding. Last check: 2007-11-07)
		Amplitude modulation (am) is a form of modulation in which the amplitude of a carrier wave is varied in direct proportion to that of a modulating...
		In telecommunications, to heterodyne is to generate new frequencies by mixing two or more signals in a nonlinear device such as a vacuum tube, transistor,...
		Image response (or more correctly, image response rejection ratio, or imrr) is a measure of performance of a radio receiver, particularly one that operates on the...
	www.absoluteastronomy.com /encyclopedia/s/su/superheterodyne_receiver.htm (1483 words)

	Microwave Receivers - Microwave Encyclopedia - Microwaves101.com
		When a receiver uses a mixer (as in a superheterodyne receiver), we refer to the input frequency as the RF frequency.
		Noise figure of a receiver is a measure of how much the receiver degrades the ratio of signal to noise of the incoming signal.
		Another property of good receiver VSWR is that it may help in designing a "stealthy" system, by creating a good termination to the antenna, it is less likely to re-radiate impinging radar signals.
	www.microwaves101.com /encyclopedia/receivers.cfm (1134 words)

	Introduction to the Superheterodyne Receiver
		This receiver belongs to an era before the introduction of the screen grid valve and it is interesting to observe the grid-plate capacity neutralisation applied to the triode RF amplifiers to maintain amplifier stability.
		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 /users/ldbutler/Superhet.htm (6341 words)

	Superheterodyne receiver (Site not responding. Last check: 2007-11-07)
		Tuned Radio (TRF) receivers suffered from poor frequency stability poor selectivity as even filters with a high Q factor have a wide bandwidth at radio frequencies.
		Super Heterodyne receivers "beat" or heterodyne a frequency from a local oscillator (within the receiver) with the incoming The user tunes the radio by adjusting the set's oscillator frequency the tuning of the incoming signals.
		The next evolution of Super Heterodyne receiver is the software defined radio architecture where the IF processing after initial IF filter is implemented in software.
	www.freeglossary.com /Superheterodyne_receiver (815 words)

	Method and apparatus for synchronously tuning the multi-channel superheterodyne receiver of a DF system - Patent 4214316
		It is another object of the present invention to provide a method and apparatus for synchronously tuning the multi-channel superheterodyne receiver of a DF system wherein a comb generator provides contiguous oscillator frequency coverage in response to the variations of the frequency determining signal.
		In this case, four remote receiving portions, each of which is independent of the others, is utilized, portions 10 and 12 being located one at each wingtip and portions 14 and 16 being located one in each tail section.
		The present invention, therefore, is a method and apparatus to synchronize the local oscillation frequencies of a multiple channel DF superheterodyne receiver by means of a centrally generated sweeping pilot signal which is transmitted to a step recovery diode or other type of frequency comb generator located at each remote receiving station.
	www.freepatentsonline.com /4214316.html (5817 words)

	liquidator - Hutchinson encyclopedia article about liquidator
		In law, a person appointed by a court to collect and manage the assets of an individual, company, or partnership in serious financial difficulties.
		In the case of bankruptcy, the assets may be sold and distributed by a receiver to creditors.
		In France, a receiver is known as a syndic, and in Germany as an administrator.
	encyclopedia.farlex.com /liquidator (108 words)

	Superheterodyne (Site not responding. Last check: 2007-11-07)
		What is means is that a superheterodyne receiver is more selective (has a smaller band of frequencies that it will accept, process and amplify) for the same bandwidth percentage (bw %) than a conventional receiver.
		If the receiver bw % remains the same, the range of frequencies is always less for the IF because you are multiplying bw % times a smaller number (the IF).
		The fact that a superheterodyne receiver passes a smaller range of frequencies for a fixed bandwidth percentage is called arithmetic selectivity and is one of its major advantages over conventional receivers.
	www.fas.org /man/dod-101/navy/docs/fun/superhet.htm (308 words)

	Superheterodyne Receiver
		If you disect a discarded transistor...one receiver to take out this can, be very careful because the base is plastic and if you apply too much heat with your soldering iron to the pins, not only will you take out the box, but also the pins out of its' plastic base.
		The position of the components is not critical at the frequencies that the receiver works...from 550 KHz to 1600 KHz...which is the medium wave broadcast band.
		And once the receiver comes to life, you can mount it in a more permanent way and even introduce it in a cabinet and test its' performance in the open field.
	www.braincambre500.freeservers.com /Superheterodyne%20Receiver.htm (1245 words)

	Communications Trainers (Site not responding. Last check: 2007-11-07)
		The RF front end of the FM receiver uses a unique concept that exposes all of the working circuitry of the FM unit to the student.
		Thus all of the shielding that normally hides the working coils of an FM receiver front end is eliminated.
		All incidental circuit components of the FM receiver are mounted on the underside of the board.
	home.att.net /~cat1/cat36.htm (595 words)

	R1155 receiver (Site not responding. Last check: 2007-11-07)
		The receiver has 10 valves of which 3 are for the D/F and one is a Tuning Indicator (magic eye).
		I have used this receiver for SSB and found that frequency adjustment is not necessary.
		I have had this receiver for over 20 years, as it was bought by a friend from Chris Cowan VK2PZ, and then passed on to me. When I finally started to restore it 3 years ago, I had to remove the years of dust and dirt and take stock of what was missing.
	www.shlrc.mq.edu.au /~robinson/museum/R1155.html (3287 words)

	A HILBERT TRANSFORM BASED RECEIVER POST PROCESSOR
		A significant problem in the design of superheterodyne receiver and vector network analyzers is developing the coherently related LO offset frequency.
		The primary function of the receiver post processor is the precise and quantitative identification of the circularity errors and the associated suppression of these errors.
		A simulated receiver input consisting of a swept frequency measurement from 4 to 12 GHz through a 10 foot path length differential including a pair of antennas is used for the following example.
	www.nearfield.com /amta/amta91ds.htm (2046 words)

	Industry Canada Advanced Qualification Question Bank - Part c) (Site not responding. Last check: 2007-11-07)
		The mixer stage of a superheterodyne receiver is used to: (1) remove image signals from the receiver (2) allow a number of IF frequencies to be used (3) change the frequency of the incoming signal to that of the IF (4) produce an audio frequency for the speaker
		A superheterodyne receiver designed for SSB reception must have a beat-frequency oscillator (BFO) because: (1) the suppressed carrier must be replaced for detection (2) it phases out the unwanted sideband signal (3) it reduces the pass-band of the IF stages (4) it beats with the receiver carrier to produce the missing sideband
		The greatest significant change in the superheterodyne receiver in the past few years has been the introduction of semiconductors to replace the vacuums tubes.
	www.ve2dm.net /ricqb/advanced/advqbc.html (1728 words)

	Department of Electrical Engineering
		The signal enters the receiver at the antenna, and is fed into a radio-frequency (RF) amplifier, which has a gain of about 85 volts per volt (V/V) and a bandwidth of 43.4 kHz.
		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.
		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)

	RCA Radiola page1 (Site not responding. Last check: 2007-11-07)
		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.
		Prior to 1930, all RCA receivers were manufactured by either General Electric or Westinghouse and except for the do-it-yourself kit market, RCA refused to licence the superheterodyne to other manufacturers until after 1930.
	www.geocities.com /tysye/radiola1.html (271 words)

	[No title] (Site not responding. Last check: 2007-11-07)
		A superheterodyne radio works by mixing the incoming RF signal with a local-oscillator (LO) signal to produce an IF.
		The workhorse of the receiver is IC, a Plessey ZN414, originally designed as a simple, one-chip AM radio.
		Tune to the center of the receiver's range and carefully listen for a station.
	www.web-ee.com /Schematics/Superhet/superhet.htm (554 words)

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