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	History of radio - Wikipedia, the free encyclopedia
		In 1897 Marconi established the a radio station on the Isle of Wight, England.
		FM radio was invented by Edwin H. Armstrong and patented in 1933.
		Radio was used to transmit pictures visible as television as early as the 1920s.
	en.wikipedia.org /wiki/History_of_radio (2602 words)

	Radio
		It was Heinrich Rudolf Hertz who, between 1886 and 1888, first validated Maxwell's theory through experiment, demonstrating that radio radiation had all the properties of waves (now called Hertzian waves), and discovering that the electromagnetic equations could be reformulated into a partial differential equation called the wave equation.
		Another effect is that the shorter radio waves act more like light, travelling in straight lines that are not reflected back towards the Earth by the ionosphere, resulting in a shorter effective reception range.
		FM receivers are subject to the capture effect, which causes the radio to only receive the strongest signal when multiple signals appear on the same frequency.
	www.teachtime.com /en/wikipedia/r/ra/radio.html (2709 words)

	THE OUTLINE OF RADIO, Chapter 1: A Brief Historical Review
		Radio as we know it to-day is no single invention or discovery; modern instruments utilize the novelties devised by a host of engineers and physicists whose work extends over the past seventy years or more.
		In the growth of radio it appears that voice transmission was not proposed until Professor Fessenden in l9O2 suggested that his continuous-wave method of transmission was suitable for radio-telephony.
		Wartime applications of radio on aircraft, in long-distance service, for location of ships' positions, etc., were rapidly adapted to peaceful public uses in 1919 and 1920; the trans-Atlantic fliers in the “NC-4” succeeded (1919) in sending messages 1,800 miles from the plane while in the air.
	www.eht.com /oldradio/history/outline/Hogaxx.htm (4163 words)

	Kids Work!
		He used radio waves to transmit Morse code and the instrument he used became known as the radio.
		Radio works by changing sounds or signals into radio waves, which travel through air, space, and solid objects, and the radio receiver changes them back into the sounds, words, and music we hear.
		A radio broadcast is a one-way transmission, originating from a radio station.
	www.knowitall.org /kidswork/etv/history/radio (239 words)

	[No title]
		Telegraphy proficiency remains one of the examination elements that, by international treaty, an examinee must pass to obtain an amateur service operator license that authorizes operating privileges in the portion of the radio spectrum below 30 MHz.
		Proficiency in telegraphy using the Morse code was mandated to ensure that operators of amateur radio stations would not cause interference to Government and commercial stations and that amateur radio stations would be able to stay clear of maritime distress messages.
		In this connection, we note that this is the minimum telegraphy speed that has been required for the Novice Class operator license since 1951, and is the minimum telegraphy proficiency that must be demonstrated by a Technician Class licensee to be authorized HF privileges.
	www.fcc.gov /Bureaus/Wireless/Orders/1999/fcc99412.txt (11964 words)

	22. Word Origins
		Radio, currently a synonym for "electromagnetic radiation", actually first came into use before Heinrich Hertz's proof of the existence of radio waves.
		Originally "radio" was a general prefix meaning "radiant" or "radiation" -- hence the term "radio-activity" for the alpha, beta, and gamma rays emitted by decaying atoms.
		Amateur radio operators are often referred to as "hams" -- a term with an complicated history.
	earlyradiohistory.us /sec022.htm (616 words)

	Radio Telegraphy
		(1844-1940) is revered in France as the inventor of wireless telegraphy.
		In 1890, Branly, a professor of Physics at the Catholic University of Paris, discovered that when exposed to even a distant spark transmission field, loose zinc and silver filings would cohere and provide a path of increased conductivity that could be used to detect the presence of the transmission.
		It may be fairly said that Marconi single-handedly advanced the development of radio telegraphy by decades.
	www.ee.umd.edu /~taylor/Electrons2.htm (521 words)

	Telecommunication > Radio
		By contrast, other types of emissions which fall outside the RF range are gamma rays, X-rays, infrared and ultraviolet light, and light visible to humans.
		It was Heinrich Rudolf Hertz who, between 1886 and 1888, first validated Maxwell's theory through experiment, demonstrating that radio radiation had all the properties of waves (then called Hertzian waves), and discovering that the electromagnetic equations could be reformulated into a partial differential equation called the wave equation.
		Radio teletypes usually operate on short-wave (HF) and are much loved by the military because they create written information without a skilled operator.
	www.telecommunication.teleactivities.net /radio (2526 words)

	Radio -- Fessenden and the Early History of Radio Science
		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.
		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.
	ewh.ieee.org /reg/7/millennium/radio/radio_radioscientist.html (10032 words)

	The Infography about the Invention of the Radio
		The following sources are recommended by a professor whose research specialty is the invention of the radio.
		Blake, G.G. History of Radio Telegraphy and Telephony.
		Radio's 100 Men of Science: Biographical Narratives of Pathfinders in Electronics and Television.
	www.infography.com /content/354611361098.html (258 words)

	The Fascination of Radio Telegraphy (1920)
		Grammar, High School, and College boys are represented, while men from every profession and trade find Radio Telegraphy a highly instructive, intensely interesting and useful pastime or hobby, as well as one of the most potent features in the development of our modern civilization.
		Radio work as practiced by the Amateur is exactly the same as Radio work practiced by the professional.
		For the average boy or young man to learn the Continental Radio Code (that used in all Radio communication) is simpler and easier than it is for a six-year old youngster to learn the alphabet.
	earlyradiohistory.us /1920how.htm (1205 words)

	Maritime radio telegraphy world wide news,
		From what you hear you may guess what kind of ability was necessary for a radio operator and what a sensitive ear was needed to select the right information.
		This may induce sadness, mainly when the Maritime radio telegraphy was part of your professional life.
		The double CD with registrations from the 70ies and 80ies from all over the world are not only of interest for former radio operators but for all those that feel somehow attached to CW.
	www.seefunker.de /sfk/CD-E.htm (389 words)

	The FCC History Project - RADIO: Selected Bibliography
		Radio’s Conquest of Space: The Experimental Rise in Radio Communication.
		Radio and Television Regulation: Broadcast Technology in the United States, 1920-1960 (Baltimore: The Johns Hopkins University Press, 2000).
		Noble, Daniel E. “The History of Land-Mobile Radio Communications,” Proceedings of the Institute of Radio Engineers, 50:1405-1414 (May 1962).
	www.fcc.gov /omd/history/radio/bibliography.html (1069 words)

	The Art & Skill of Radio-Telegraphy - Ch 6: Fast & Effective Morse
		Back in the days of landline telegraphy sixteen wpm was considered the minimum to qualify a new operator, while 25 - 30 was considered a "standard" range of speed.
		But as radio amateurs, CW is one element of our hobby, something we do because we like to do it.
		Their sounders were continuously on the line and they could and did hear, almost unconsciously listening to everything that was said to anyone on the line: they knew everything going on.
	www.zerobeat.net /tasrt/c06.htm (2262 words)

	The Telegraph Office -- for Telegraph Key Collectors and Historians
		The Era of Morse Telegraphy: An account of the glory days by one who lived it.
		Radio Officer's radiogram 'abstract' from S.S. Cities Service Denver, KDNN, 1940: A required log of messages sent and received including charges and message class.
		Edwin H. Armstrong: Armstrong (father of regenerative receivers and FM radio) home page; many fine photos of early gear and documents from the Harry Houck collection.
	www.telegraph-office.com /tel_off-page.html (2958 words)

	The Art & Skill of Radio-Telegraphy - Ch 19 Part II: History of Morse telegraphy
		Chapter 19 - A Brief History of Morse Telegraphy - Part II Morse telegraphy was introduced into Germany in 1847 by a Mr.
		Telegraphy grew up with the railroads, making train dispatching, etc., easier and safer.
		The static and the signals tended to sound too much alike, and at the low radio frequencies then in use, static was heavy during at least half the year.
	www.zerobeat.net /tasrt/c19b.htm (1729 words)

	The Art & Skill of Radio-Telegraphy - Title Page (Site not responding. Last check: 2007-10-29)
		"For those who are interested in telegraphy, for those who would like to learn it, for those who love it, and for those who want to improve their skills in it."
		The art and skill of telegraphy is unique.
		The psychologists who have seriously studied those who have developed this skill have been fascinated and challenged to try to understand it.
	www.geocities.com /gm0rse/n0hff (173 words)

	Selected Bibliography -- Wireless Telecommunications
		Radio and Television Regulation: Broadcast Technology in the United States, 1920-1960 (Baltimore: The Johns Hopkins
		Radio Frequency Principles and Applications : The Generation, Propagation, and Reception of Signals and Noise (IEEE Press/Chapman and Hall Publishers se Albert A. Smith, Albert, Jr.
		ELF/VLF Radio Wave Propagation, Proceedings of the NATO Advanced Study Institute, Spåtind, Norway, April 17-27, 1974, edited by Jan A. Holtet, University of Oslo, Dept. of Physics, Norway
	www.tfcbooks.com /special/lf/prop_bib.htm (1754 words)

	Rare books about static electricity, lightning, wireless, and radio. (Site not responding. Last check: 2007-10-29)
		An excellent presentation of the science of wireless telegraphy and telephony.
		Accompanied by a first-rate explaination of the principles of wireless telegraphy from a scientific and historical perspective.
		This unique text analyzes many circuits and hookups contemporary with its publication and is very useful for learning about radio.
	people.clarityconnect.com /webpages2/arcsandsparks/reprintpage.html (1343 words)

	Search results for Telegraph by dxzone.com
		K9YA Telegraph - FREE ham radio newsletter The K9YA Telegraph is in full-color and delivered to your computer each month as a PDF.
		Maltese Band Plan - National radio frequency allocation plan by the Wireless Telegraphy Department of malta.
		The Art & Skill of Radio Telegraphy - For those who are interested in telegraphy, for those who would like to learn it, for those who love it, and for those who want to improve their skills in it
	www.dxzone.com /cgi-bin/search/search.cgi?query=Telegraph&mh=10&bool=or (491 words)

	CW Book (Site not responding. Last check: 2007-10-29)
		In keeping with the Morse code theme used by the Radio Amateur Educational Society (RAES) the cover has a picture of the Titanic with the first and last message sent by MGY these are in the background of the Book Title text.
		The story of the Titanic as recorded by Lloyd's of London is in the back of the book.
		The Radio Amateur Educational Society (RAES) is a Non-Profit Society registered in the province of Alberta, Canada.
	www.raes.ab.ca /book (204 words)

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