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Topic: Crystal radio receiver

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	Meccano Crystal Radio Receiver
		The subject of radio transmission and reception is in itself a vast and complex science, but the installation of a receiving apparatus of sufficient power to receive messages from broadcasting stations at reasonable distances, is something which any bright intelligent boy can accomplish for himself with little difficulty.
		With the aid of a receiving set, constructed entirely of Meccano parts, and the addition of telephone ear-pieces, crystal, and one or two inexpensive fittings, they have listened to concerts, speeches, reports, etc., broadcasted from points five to twenty miles distant, with the greatest enjoyment.
		At the time the construction of radio receivers was not something that anyone was permitted to do without first obtaining a constructors licence.
	www.dalefield.com /nzfmm/magazine/Crystal_radio.html (2659 words)

	Crystal radio receiver
		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.
		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 pressing against a sensitive point on a galena mineral crystal in a holder.
		A semiconductive mineral crystal, usually lead sulfide (galena) or cadmium sulfide was fixed inside a brass cup and the radio operator found the loudest signal by touching the wire, called a cat's whisker, to various points on the surface of the crystal.
	www.xasa.com /wiki/en/wikipedia/c/cr/crystal_radio_receiver.html (834 words)

	Spartanburg SC \| GoUpstate.com \| Spartanburg Herald-Journal (Site not responding. Last check: 2007-09-24)
		Crystal radio was invented by a long, vague chain of discoveries in the late 1800s that culminated into the first practical kind of radio receiver in the early 1900s; and constitutes the origin of the field of electronics.
		Crystal sets represented an inexpensive and technologically simple method of receiving these signals at a time when the embryonic radio broadcasting industry was beginning to grow.
		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.
	www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=Crystal_radio_receiver (1711 words)

	[No title] (Site not responding. Last check: 2007-09-24)
		The Crystal radio receiver was first built c1900 by Greenleaf Whittier Pickard, who used crystalline minerals to detect radio signals.
		Even though vacuum tube radios were common following World War I, crystal radios remained popular, especially among beginning amateur radio enthusiasts, Boy Scouts and school children, who built crystal radios to learn basic electronics and communication.
		It's been suggested that crystal radios may still be in use by spys.
	www.wikiwhat.com /encyclopedia/c/cr/crystal_radio_receiver.html (347 words)

	Crystal Radios: The Beginnings of Wireless (Site not responding. Last check: 2007-09-24)
		In the typical early radio-wave crystal detector, the crystal rock was fixed into a brass cup and the radio operator found the loudest signal by touching the wire, called a cat’s whisker, to various points on the surface of the crystal.
		During the Great Depression, a perfectly workable crystal radio detector could be constructed from a five-cent piece of galena crystal and the wire from a safety pin, and building and using homemade crystal sets brought endless hours of enjoyment to children of the Great Depression.
		Over the years, fascination with crystal radio building has never died, perhaps because the technical achievements of the communication media cannot dim the enchanting simplicity of the crystal radio in its demonstration of the wonder that radio really is.
	people.clarityconnect.com /webpages2/arcsandsparks/aboutcrystalradios.html (380 words)

	Bizarre: Crystal radio
		A very simple crystal radio is not very selective, and if there are more than one nearby stations broadcasting near the same frequency, there will more than likely be some overlap, and you will hear two or more broadcasts at once.
		A crystal detector includes a crystal, a cat's whisker, which is a special thin wire that contacts the crystal, and the stand that holds the components in place.
		Crystal radios can be refined and precise pieces of equipment with careful design and construction.
	bizarrelabs.com /crystal.htm (2952 words)

	Cyrstal Radio (Site not responding. Last check: 2007-09-24)
		My first ever radio: a crystal radio kit for my 6'th birthday.
		This arrived in a plastic packet containing a three-way terminal block, 3mm headphone socket, Crystal earpiece, variable capacitor, glass germanium diode, a small capacitor, 3-inch ferrite rod and a certain amount of enamelled wire.
		It is very important to use a high impedance crystal earpiece (or headphones), not the modern low impendance moving coil types.
	www.hanssummers.com /radio/crystal/index.htm (156 words)

	Crystal radio receiver
		the simplest radio receiver, consisting of a long-wire antenna electronics 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 pressing against a sensitive point on a galena mineral crystal in a holder.
		A semiconductive mineral crystal, usually lead sulfide galena or cadmium sulfide was fixed inside a brass cup and the radio operator found the loudest signal by touching the wire, called a "cat s whisker", to various points on the surface of the crystal.
		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.
	www.uk.kunsimuna.net /Crystal_radio_receiver_UK_751577_px (462 words)

	Crystal-radio.eu
		Kristalontvangers zijn radio's welke zonder netspanning of batterijen werken, de benodigde energie wordt opgepikt met een antenne en is afkomstig van de zender waar je naar luistert.
		Crystal receivers are radio receivers which work without mains voltage or batteries, the energy it uses is picked up with a antenna and comes from the station you are tuned to.
		kristal radio - crystal radio - cristal radio - kristallradio - radio de cristal - detectorradio - detector empfaenger - detectorempfaenger - kristall empfaenger - kristaldetector - kristalldetector - crystaldetector- crystal detector - kristaldetector - kristal detector - cristal detector - cristaldetector - receptor de cristal
	www.crystal-radio.eu (277 words)

	FM Crystal Radio
		When connected as a receiver to a good sound system the sound fidelity is as good or better than more expensive AM radios.
		My definition of a crystal radio is one that is not powered, except by the radio transmission itself and employs a crystal detector.
		An FM crystal radio must be able to detect and receive FM signals well enough to be heard in earphones without any such extra power.
	solomonsmusic.net /FM_CrystalRadio.html (936 words)

	Build a Crystal Shortwave Radio
		A crystal receiver is powered solely by the radio waves that it pulls from the air.
		We dubbed this inexpensive radio the "EconOceanic" in honor of the legendary Zenith TransOceanic family of shortwave radios.
		In this radio, a diode serves as the detector, separating the fluctuating direct current (containing the voices and music of the broadcast) from the amplitude-modulated, radio-frequency, alternating-current carrier wave that was transmitted from the radio station antenna.
	antiqueradio.org /econoceanic.htm (3835 words)

	Radio history in Philadelphia - the receiver side
		There are two other names that are well known and several more that tried their hand at radio receiver manufacturing.
		The first radio receivers to carry the RCA brand name were the Radiola models.
		This table-top radio operated on batteries, had three tubes, a two-dial front panel, a top door and was housed in a low, wooden, rectangular case.
	radiomagonline.com /features/radio_radio_history_philadelphia (772 words)

	Consruct the Mystery Crystal Set
		The Mystery crystal receiver is so called because I do not know just why it should be so good, and after trying it out for about a fortnight I am more amazed at the results than before.
		The Mystery crystal set is really a definite solution to the inexpensive crystal receiver selectivity problem and all readers who build up the set have an excellent receiver possessing excellent punch and selectivity.
		This receiver will be excellent to try out as an experiment over the Easter holidays, for all those crystal set enthusiasts who have built up Mystery crystal sets in their original forms will have very little difficulty in making the change over.
	www.clarion.org.au /crystalset/mystery.html (2165 words)

	PV Scientific’s Euro-dyne Crystal Radio or Crystal Radio Kit (Site not responding. Last check: 2007-09-24)
		The Euro-dyne Crystal Radio Receiver's advanced selectivity, sensitivity, and circuitry are exactly the same as those of our Ether-o-dyne but, to reduce package size and thus trans-oceanic shipping costs, the Euro-dyne contains two units that can be shipped separately.
		Like our Ether-o-dyne, the Euro-dyne Crystal Radio Receiver is built on a finished pattern-grade mahogany base and includes matched antique variable capacitors;; matched antique dials; and matched antique switch points, sliders, and binding posts.
		This crystal radio receiver's coils are wound with the best quality dyed, double cotton-covered wire on genuine phenolic forms for a truly classic appearance.
	ww1.arcsandsparks.com /webpages2/arcsandsparks/multiwaveradio.html (280 words)

	Crystal Radio (Site not responding. Last check: 2007-09-24)
		This is a generic circuit, the first true radio receiver in history.
		Crystal radio requires no power supply to operate because it uses energy from the signals it receives.
		Since no power is required for operation, having such a receiver could prove handy in an emergency situation or just to hear the news when you're out in the woods backpacking...
	www.geocities.com /tomzi.geo/crystal/crystal.htm (316 words)

	Chapter 4: Radio
		A crystal radio is the distilled essence of a radio.
		The reason a crystal radio does not need any batteries is the amazing capabilities of the human ear.
		However, because they are usually far away, and we have at most a few hundred feet of wire for an antenna, the amount of energy we receive with the crystal radio is measured in billionths of a watt.
	www.scitoys.com /scitoys/scitoys/radio/radio.html (1504 words)

	Make Your Own Low-Power AM Radio Transmitter
		AM radio signals are carried by medium frequency (MF) radio waves (530 to 1710 kHz in North America, 530 to 1610 elsewhere), and FM radio signals are carried by very high frequency (VHF) radio waves (88 to 108 MHz).
		On the Radio Shack audio transformer, the blue and green wires are the 1000 ohm side, and the red and white wires are the 8 ohm side.
		Rotate the radio receiver antenna relative to your transmitter's antenna (or vice versa).
	www.sciencebuddies.org /mentoring/project_ideas/Elec_p024.shtml (2168 words)

	Crystal Radio Sets on the Net! - How Your Crystal Earphone Works
		Crystal radios are, at best, a compromise when it comes to tuning (selectivity) and volume (sensitivity) and there are a number of reasons for this.
		Crystal Radio designs prefer a high impedance (hi Z) earphone, so that an adequate signal voltage from the tuner and detector stages can be developed across it.
		The Crystal Earphone is essentially a capacitove device -it has no direct connection (such as a coil in the older style dynamic headphones) and can therefore exhibit a fairly high impedance to the signal fed into it, which is upwards of 10,000R.
	www.angelfire.com /biz2/radiosets/earphone.htm (334 words)

	Chapter 4: Radio
		A crystal radio is the distilled essence of a radio.
		The reason a crystal radio does not need any batteries is the amazing capabilities of the human ear.
		However, because they are usually far away, and we have at most a few hundred feet of wire for an antenna, the amount of energy we receive with the crystal radio is measured in billionths of a watt.
	sci-toys.com /scitoys/scitoys/radio/radio.html (1504 words)

	Crystal Radio
		Crystal radio is the common type of radio.
		Radio radiation is unseen rays of magnetism and electricity.
		Radio wave electricity is the current that radio rays produce in the antenna wire.
	www.radioandyou.com /types/Crystal-Radio.htm (374 words)

	Robot MarketPlace - R/C Crystals
		Crystal sets come with (1) Transmitter and (1) Receiver crystal, or you may order just the receiver or just the transmitter crystal by itself.
		Not all JR crystals are in stock, some are special order, and may take a week or more to arrive.
		The receiver crystals are the mini-style UM-1 to be used in all of our GWS "pico" receivers.
	www.robotcombat.com /store_rc_crystals.html (418 words)

	Vintage Radio and Electronics. Crystal (Xtal) Radio
		The pictures above show the Repanco Crystal Receiver Coil in circuit the components are as follows: a single pole switch to change the waveband, Diode 1N34, 500pf Dilecon Variable Capacitor and of course the coil.
		The pictures above show the Teletron Crystal Receiver Coil in circuit the components are as follows: Diode 1N34, 500pf Dilecon Variable Capacitor and of course the coil.
		During daylight Virgin Radio was the dominant station, after dark European stations were evident but not as many as the Repanco.
	vintageradio.me.uk /crystal/crys.htm (209 words)

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