Detector (radio) - Factbites

Detector (radio) - Factbites
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Topic: Detector (radio)

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	Find Useful Whistler Radar Detecters Information
		Whistler DE1770 Laser/Radar Detector with NOAA Weather Radio.
		test, radar detector uk, radar detector, radar detectors whistler, radar detectors, radar laser detector, radio...
		Whistler warrants this radar detector for A lifetimes from the...
	www.undetected.co.uk /Directory/U-W/whistler-radar-detecters.html (410 words)

	Home Security - Radio Shack Home Security System
		... a radio at all. Her mechanic did recommend radio shack for a voltage booster. This way, I could run a ... ... you want to use newer accessories (radio, CD player, radar detector, mobile phone) in your older or ...
		phantom radar detector/jammer, radar detector - radio shack radar detectors Now to the Bel 980. What an awesome product. In the two weeks that I have owned this detector, it has already saved me ...
		... radio shack radar detector 22 · radio shack radar detector · radar detector · motorcycle radar detectors · laser detectors · beltronics pro rx65 radar detector · gps laser detectors · radar ...
	www.ahomesecurity.com /radioshackhomesecuritysystem (3196 words)

	Bat Detector Tranquility
		This type of bat detector is similar in operation to and old fashioned radio with a tuning control knob, where you turn the knob to your required radio station, you can only listen to one station at a time.
		The bat detector operates in a similar fashion but instead of tuning over a range of radio frequencies, it tunes over a range of ultrasonic frequencies.
		A bat detector is a device which picks up the ultrasonic echolocation and social calls of bats and converts them into the human audible range.
	www.users.globalnet.co.uk /~courtpan/timeexpan.htm (3196 words)

	DETECTOR - Definition
		crystal detector, device, electric eye, electronic equipment, electronic scanner, magic eye, metal detector, mine detector, photocell, photoconductive cell, photoelectric cell, radio, radio receiver, radio set, receiving set, rectifier, scanner, tuner, wireless
		{Bank-note detector}, a publication containing a description of genuine and counterfeit bank notes, designed to enable persons to discriminate between them.
		calorimeter, chemical detector, clinical thermometer, cryometer, electric thermometer, electronic counter, electronic detector, error corrector, error detector, galvanothermometer, gas thermometer, liquid-level sensor, meat thermometer, metal detector, photoelectric sorter, pyrometer, pyrometric cone, resistance pyrometer, sensor, telethermometer, temperature sensor, thermocouple, thermoelectrometer, thermometrograph, thermostat, ultrasonic detector
	www.hyperdictionary.com /dictionary/detector (3196 words)

	Crystal Radio Resources
		My introduction to crystal radios was in the early '50s when I received a Cub Scout crystal set with a slide tuning coil and a galena detector.
		First, I resurrected my almost extinct ham ticket and then started building crystal radios-my first attempt was the Oatbox Radio from plans the Xtal Set Society posts-had so much fun with it that I got my physics students to build them, and am still at it.
		I've incorporated it into a crystal set my students build and it is selectable between crystal detector mode and "triode" detector/amplifier mode.
	www.thebest.net /wuggy (954 words)

	Crystal radio receiver - Wikipedia, the free encyclopedia
		The crystal radio receiver (also known as a crystal set) is a passive radio receiver consisting of a variable LC circuit tuned circuit, a diode detector, and audio transducer.
		The detector extracts the amplitude modulation from the radio signal by rectifying it, and provides an audio output in proportion to the strength of the signal coming from the antenna.
		The crystal radio did not require batteries, but it did require the user to purchase a commercially made set of headphones (or telephone receivers as they were called in those days), since that accessory was not suitable for home construction.
	en.wikipedia.org /wiki/Crystal_radio_receiver (1215 words)

	R1155 receiver
		Radio Goes to War and a Legend is Borne, Chas E. Miller, Radio Bygones Number 1, August/September 1989, P3-5, 27.
		The receiver has an RF stage, a mixer/oscillator, two IF stages, an AVC and BFO stage, a detector, an audio amplifier, and a magic eye tuning indicator.
		The receiver has a VR100 RF stage, a VR99 mixer/oscillator, two VR100 IF stages, a VR101 AVC and BFO stage, a VR101 detector, and audio amplifier.
	www.shlrc.mq.edu.au /~robinson/museum/R1155.html (3287 words)

	Trevor Bayliss - The Clockwork Radio - A project that started with a few commnets heard on a news report and ended up helping millions in many countries of the World - Design And Technology On The Web's guide to Inventors and Inventions
		The clockwork radio was the result of much hard work and experimentation but would not have resulted in the product we now know had reports about his ideas not reached those capable of giving financial support to the project.
		Inspiration for the 'Clockwork Radio' came from hearing a report on the subject of AIDS in Africa and the problems resulting from the lack of information about the problem.
		Trevor Bayliss - The Clockwork Radio - A project that started with a few commnets heard on a news report and ended up helping millions in many countries of the World - Design And Technology On The Web's guide to Inventors and Inventions
	www.design-technology.info /inventors/page8.htm (303 words)

	uboat.net - Fighting the U-boats - The Battle against the U-boat in the American Theater
		Among the devices that the group helped develop or test were the absolute altimeter, the magnetic anomaly detector (MAD), the radio sonic buoy, improved airborne depth charges, longrange navigation, and airborne microwave radar.
		The magnetic anomaly detector (MAD) operated by sensing a change in the magnetic field of the earth, an anomaly that could be produced by the steel hull of a submarine.
		Combined with the use of a radio sonic buoy to listen for the sounds of a submarine, the MAD permitted an intensive search with a high probability of success.
	uboat.net /allies/documents/usaaf_asw3.htm (2457 words)

	BWCM - Crystal - Project Overview
		Our goal, then, for the first project is to design and build such a receiver, while learning the basics of radio engineering, such as impedance matching and antennas, along the way.
		To accomplish this task, the receiver consists of four parts: an antenna system, a tuner, a detector, and an earphone.
		The antenna converts EM waves into electrical current, the tuner filters the current to select out only the desired station, the detector extracts the audio modulating waveform from the RF, and the earphone converts the audio electrical signal to sound waves for your ear.
	www.rocket-roar.com /BWCM/crystal/over.html (266 words)

	Crystal Radio Page
		A crystal radio uses only tuned circuits to select the stations, and a crystal detector to rectify the radio station's signal to enable it to be heard with a set of headphones.
		This crystal radio uses a European Jackson Brothers detector tuning capacitor and a Xtal Set Society dual gang antenna tuning capacitor.
		Every part and parcel of a crystal radio must be perfectly designed if you expect it to work well, since all your operating power comes directly from the broadcast station you are receiving.
	www.hobbytech.com /crystalradio/crystalradio.htm (3986 words)

	Detector - Wikipedia, the free encyclopedia
		In an AM radio receiver, a "detector" is a circuit or device that recovers the signal of interest from the modulated wave.
		Cryogenic detectors are sufficiently sensitive to measure the energy of single x-ray, visible and near infra-red photons (Enss 2005).
		There are optical detectors that are effectively thermometers, responding purely to the heating effect of the incoming radiation, such as pyroelectric detectors, Golay cells, thermocouples and thermistors, but the latter two are much less sensitive.
	en.wikipedia.org /wiki/Detector (437 words)

	Radar Detectors:Cobra,Whistler,Rocky Mountain
		The radar detector works by scanning the air for any radio frequencies or laser beams and alerts you if and when it detects one.
		The radar detector industry has changed significantly in the past few years in direct response to the advances in the equipment being employed by police agencies nationwide.
		The newest technology in radar detectors is designed to pick up those "rogue" signals and alert you to the presence of the device.
	www.radardetector1.com (379 words)

	Metal Detector build your own
		BFO (beat frequency oscillator) metal detectors use two oscillators, each of which produces a radio frequency.
		On the working detector shown in these pictures we wound 10 turns on to the searchcoil which then oscillated at 104 khz Then we wound on to a piece of 12mm dia x 50mm long wooden dowel (taken from a bird cage) 120 turns of wire.
		This type of detector is most sensitive when the beat note is close to zero, about 5hz (motor boating) any slight change being noticeable.
	home.clara.net /saxons/bfo.htm (1491 words)

	detector
		a device, as a crystal detector or a vacuum tube, that rectifies the alternating current in a radio receiver.
	www.infoplease.com /dictionary/detector (73 words)

	Truth Detector, Voice Stress Analyzer - TM25
		The Truth Detector accurately measures changing stress levels in the voice, but as each individual's voice reacts differently, the Truth Detector can not be infallible.
		While no device can absolutely tell truth from false, this interactive machine is fascinating to watch as you engage in conversations with friends and associates, or you can even use it to monitor the voices of actors or politicians: Testing can be done from conversations on the radio, television, and even tape recordings.
		The Truth Detector is powered by a 9-volt battery, sold separately.
	www.smarthome.com /3350.html (312 words)

	History of radio - Wikipedia, the free encyclopedia
		Inventions of the triode amplifier, generator, and detector enables audio radio.
		Radio was used to transmit pictures visible as television as early as the 1920s.
		FM radio was invented by Edwin H. Armstrong and patented in 1933.
	en.wikipedia.org /wiki/History_of_radio (2602 words)

	Crystal radio receiver - Wikipedia, the free encyclopedia
		A crystal set is the simplest radio receiver, consisting of a long-wire antenna, a tuner to select the desired radio signal by frequency, and a detector consisting of a diode demodulator usually consisting of a sharp wire or pin pressing against a sensitive point on a galena mineral crystal in a holder.
		GIs during World War II constructed similar radios from rusty razor blades and pencil lead, the iron oxide crystals of the rust replacing the galena crystal and the graphite of the pencil lead substituting for the safety-pin wire.
		When radio broadcasting became popular in the 1920s, many amateur experimenters bought or constructed crystal sets, often with the tuner inductor coil wound on a tubular oatmeal box or a drinking glass.
	en.wikipedia.org /wiki/Crystal_radio_receiver (800 words)

	Chapter 4: Radio
		A detector is something that picks the audio frequencies out of a radio wave, so they can be heard in the earphone.
		The capacitance of the antenna is reacting with the inductance of the coil to resonate at the frequency of the radio station.
		If the radio waves are moving back and forth at the right frequency, then the electrons in the wire will just be crowding towards one end of the wire when the radio waves start moving them back to the other side.
	www.scitoys.com /scitoys/scitoys/radio/homemade_radio.html (800 words)

	Radar Detector Tips - Read our Radar Detector Articles
		The Radar Detectors only identifies a radar signal, while a RD transmits a specially modulated field of light in front of the vehicle to muddle radar and laser gun readings.
		With the Radar Detector speeding is a normal part of daily life.
		These types of Radar Jammers are legal because they transmit light instead of radio frequencies to make your vehicle electronically invisible to police radar and laser guns.
	www.radar-detector-tips.com (397 words)

	POPTRONICS Continuity Tester
		We have called this design a "metal detector" as it lets you know when anything of a ferrous or non-ferrous nature is placed in the field of the coil.
		detector as this name has been left for the more complex detectors that actually discriminate been gold and other metals.
		It is important to note that the AMPLITUDE of the waveform is also reduced when a piece of metal is introduced but the radio is not set up to detect this.
	www.talkingelectronics.com /html/MetalDetector.html (2607 words)

	Development of radio interferometry
		Each antenna will be a different distance from the radio source, and as with the short baseline radio interferometer (Figure 5) the delays incurred by the extra distance to one antenna must be added artificially to the signals received at each of the other antennas.
		The radio signal received at an antenna cannot be sent further than a few tens of kilometers by electrical cable due to the signal loss incurred.
		Later interferometers included a variable delay between one of the antennas and the detector as shown in Figure 5.
	www.geocities.com /CapeCanaveral/2309/page3.html (2607 words)

	Cisco - Cable Radio Frequency (RF) FAQ
		Connect the spectrum analyzer to the radio frequency (RF) output of the upconverter.
		When the time between two initial maintenance reregistrations by the cable modem is less than 180 seconds, you get "flaps" along with "insertions." Therefore, the flap detector counts it.
		Connect the spectrum analyzer to the upstream signal from your cable network at the combiner where all the cable modems connect.
	www.cisco.com /warp/public/109/cable_faq_rf.html (2607 words)

	Radio -- Fessenden and the Early History of Radio Science
		This detector, when used with a telephone receiver in a local shunt circuit, gave such accurate reproductions that radio operators could identify several wireless telegraphy stations in the passband of the receiver by the different characteristics of the spark transmissions, just as a friend's voice is recognized by its peculiarities of tonal quality.
		In fact, early radio regulations were introduced encouraging "single-wave" or "sharp" emissions, by limiting the amplitude of the second wave to say one-tenth the amplitude of the stronger, desired wave.
		Most early radio experimenters followed or improved upon the Marconi method of signalling because in their view a spark was essential to wireless.
	ewh.ieee.org /reg/7/millennium/radio/radio_radioscientist.html (10032 words)

	Reflex Radio Receiver
		A Reflex radio is similar to the Regenerative receiver design, in that both use a controlled amount of positive feedback of the amplified signal, to reinforce it and obtain extreme sensitivity.
		Like the crystal radio, it seems to come alive at night, but may not pick up much of anything during the day (again-- AGC normally takes care of the gain adjustments between day and night reception).
		As the amount of regeneration is increased, a point is reached where the detector breaks into self-oscillation at the signal frequency (actually, just slightly off from it, which allows a beat note to be formed for CW reception).
	www.tricountyi.net /~randerse/reflex.htm (625 words)

	Patent 4195295: Pulse doppler-radio proximity fuze
		The present invention provides a pulsing system in which a thyratron relaxation oscillator is utilized to provide impulses which control the operation of an oscillator circuit to which is coupled a gated detector system.
		As soon as the positive pulse 34 is applied to the oscillator 10, said oscillator output begins to build up, and after a short build up period the radio frequency pulse, indicated at 35, will be of sufficient strength to be radiated.
		The pulse 34 attenuates rather rapidly but would produce an oscillation pulse 35 of considerable length, and it is generally desirable to utilize the clipper 12 to produce a sharp cut off 38 on pulse 34 and preferably the cut off 38 establishes the maximum radius of sensitivity.
	www.freepatentsonline.com /4195295.html (625 words)

	Patent 6195036: Pulse radio-localization system
		During a pause between pulses, a tracking of magnetron frequency is fulfilled by laying a signal, frequency 4 MHz, on the tuning voltage of said low power source and measuring a phase of resulted signal coming from a tracking detector after its reflection by the magnetron.
		The invention relates to a pulse radio technique and, more concretely, to radar system designs and the one can be used in radar system of aviation, sea and river transport, other transport means, as well as for mapping earth surface, meteorological, ecological and other researchs of atmosphere, and other aims.
		It is known pulse radar systems created on the basis of frequency-agile magnetrons and using a tracking of a resonant frequency of magnetron oscillating system ("cold frequency" of magnetron) during a pause between pulses.
	www.freepatentsonline.com /6195036.html (625 words)

	history.txt
		The biggest technical change in detectors was the development of the induction-balance system, where two coils are set up in an electrical equilibrium to produce a ‘null’ or zero balance.
		Many detectors in the 70’s had a switch which enabled the user to switch between the discriminate mode and the non-discriminate mode.
		Another leader in detector technology was Charles Garrett, who pioneered the BFO (Beat Frequency Oscillator) machine, and whose company is still one of the world leaders in design.
	www.ross-soderberg.com /history.txt (625 words)

	Radar Detectors:Cobra,Whistler,Rocky Mountain
		The radar detector works by scanning the air for any radio frequencies or laser beams and alerts you if and when it detects one.
		The radar detector industry has changed significantly in the past few years in direct response to the advances in the equipment being employed by police agencies nationwide.
		The newest technology in radar detectors is designed to pick up those "rogue" signals and alert you to the presence of the device.
	www.radardetector1.com (379 words)

	Crystal radio receiver - Wikipedia, the free encyclopedia
		The crystal radio receiver (also known as a crystal set) is a passive radio receiver consisting of a variable LC circuit tuned circuit, a diode detector, and audio transducer.
		The crystal radio did not require batteries, but it did require the user to purchase a commercially made set of headphones (or telephone receivers as they were called in those days), since that accessory was not suitable for home construction.
		The most notable is the Pixie2 CW transceiver, an inexpensive kit radio which combines a small crystal-powered transmitter with a crystal receiver attached to a small audio amplifier.
	en.wikipedia.org /wiki/Crystal_radio_receiver (1255 words)

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Topic: Detector (radio)

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In the News (Sat 2 Jun 12)