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	AM broadcasting - ArticleWorld
		The radio waves used in broadcasting have to be modulated before being transmitted, a process in which audio-frequency waves are super-imposed over carrier waves.
		AM was the most dominant method of radio broadcasting initially and continues to be popular today.
		AM radio broadcasting, as explained above, involves the modification of the amplitude of audio frequency signal received from the microphone.
	www.articleworld.org /index.php/AM_broadcasting (247 words)

	AM broadcasting - Wikipedia, the free encyclopedia
		AM broadcasting is radio broadcasting using Amplitude Modulation.
		Some microbroadcasters and pirate radio broadcasters, especially those in the United States under the FCC's Part 15 rules, broadcast on AM to achieve greater range than is possible on the FM band.
		Hobbyists also use low-power AM transmitters to provide local programming for antique radio equipment in areas where AM programming is not widely available or is of questionable quality; in such cases the transmitter, which is designed to cover only the immediate property and perhaps nearby areas, is hooked up to a computer or music player.
	en.wikipedia.org /wiki/AM_broadcasting (1465 words)

	Nurohman's Site
		Am broadcasting is the first voice broadcasting system in use and it is still with us.
		AM reception is relatively stable even on moving car, this is why some people prefer it on car and on voice programs.
		AM Broadcasting: The New Cellular Design Factor - As cellular systems have sprouted towers across the landscape, a seemingly unlikely conflict has arisen between cellular operators and old-fashioned AM broadcast stations.
	www.nurohman.pk.cx /rf_broadcast.htm (1820 words)

	AM Stereo History
		Many AM stations still offered attractive programming and had high ratings, but listeners were no longer turning to AM as their primary source for musical entertainment on the radio.
		There were five different AM Stereo systems being proposed to the FCC, and the FCC struggled with the decision of which one to choose as the single standard for AM Stereo broadcasting.
		AM Stereo is an established standard, it works very well, and it is affordable to both stations and listeners.
	ourworld.compuserve.com /homepages/kevtronics/history.htm (1077 words)

	Radio AM to FM - September 11, 1998 (Site not responding. Last check: 2007-10-19)
		So, while FM and television stereo broadcasts were readily accepted due to the quick availability of stereo broadcasts and stereo receivers, AM stereo languished.
		Sure, most AM stations in Los Angeles either broadcast in stereo or at the minimum send out a stereo "beacon" that switches on the higher-fidelity mode of some recent AM tuners.
		In other words, while I don't think AM stereo will catch on at this late time (it's been available since the early 1980s and digital broadcasts may be just around the corner), I still hope it does.
	members.cox.net /rwagoner/columns/1998/sep11.html (598 words)

	AM Stereo
		Not only did AM circuitry in these radios stop advancing, but in most instances, manufacturers actually downgraded the AM sections of their radios for the sake of cost savings, due to apathy and lack of public demand.
		Because these exciters are retrofitted onto transmitters which were never designed for AM stereo operation, they also must contain corrective equalizers and adjustable delay networks, to insure that all of the phase relationships are correct at the modulated stage of the transmitter.
		Each AM station is allowed to transmit one stereo digital channel, and cannot stream multiple channels, as in the case of FM HD Radio.
	meduci.com (2534 words)

	Method and apparatus for AM compatible digital broadcasting - Patent 6452977
		The use of digital audio broadcasting in the AM band (530 kHz to 1700 kHz) would provide AM broadcasting stations with a means to compete with high quality portable audio sources such as cassette tapes and compact disc players.
		When this technique is applied to AM radio broadcasts, the broadcasting can be done in the same frequency band and at the same carrier frequencies that are currently allocated for AM broadcasting.
		This broadcasting is accomplished by transmitting a digital waveform by way of a plurality of orthogonal frequency division modulated (OFDM) carriers, some of which are modulated in-quadrature with the analog AM signal and are positioned within the spectral region where the standard AM broadcasting signal has significant energy.
	www.freepatentsonline.com /6452977.html (5631 words)

	US Spectrum Requirements: Projections and Trends - Chapter 3
		AM broadcast stations are licensed by the FCC for operation on a channel in the 535-1705 kHz AM broadcast band.
		Depending on the broadcast station class, maximum operating power ranges from.25 kilowatts to 50 kilowatts.[EN324] Propagation in the AM broadcast band involves both the ground wave and skywave modes.
		The potential exists for an enhancement to the U.S. AM broadcast operations with the introduction of digital audio broadcasting technology, where the audio fidelity is expected at or near CD-quality.
	www.ntia.doc.gov /openness/sp_rqmnts/broadca3.html (1969 words)

	Radio AM to FM (Site not responding. Last check: 2007-10-19)
		Once the dominant broadcast medium in the world, AM radio's popularity has shrunk to its lowest level in history.
		Broadcast Technician Scott Todd wants to change things, and has submitted a petition to the FCC to get the lawmakers to help AM before its too late.
		Todd says in Radio World that digital AM is too far off and has not been proven; other observers feel that digital AM is just a few years away.
	members.cox.net /rwagoner/columns/2000/aug1100.html (531 words)

	[No title] (Site not responding. Last check: 2007-10-19)
		Radio Broadcasting ranks with electricity, the telephone, the automobile and indoor plumbing for its impact on American life.
		AM broadcasting has prospered for seven decades since its beginning in the 1920's and continues to prosper in spite of competition from television.
		The introduction of the directional antenna in the late 1930's further permitted more broadcasting stations to coexist on the same channel with a tolerable level of interference.
	ieee.cincinnati.fuse.net /reiman/11_1993.html (442 words)

	AM Stereo in the USA (FCC) USA
		AM Stereo was first proposed to the Commission in 1958 and 1959 separately by Philco Corporation, Radio Corporation of America, and Kahn Research Laboratories, Inc. On September 27, 1961 [21 RR 1616c], the Commission denied these requests for a rulemaking proceeding on the subject, stating
		Contrary to the circumstances which motivated the rule amendments authorizing and standardizing stereophonic transmissions by FM broadcasting stations, there is little evidence of public need or industry desire for similar rule changes with respect to stereophonic transmissions by standard broadcast stations.
		As neither broadcasters nor receiver manufacturers wanted to invest in what could be a losing system, effective implementation of AM stereo in the USA was delayed.
	www.fcc.gov /mb/audio/bickel/amstereo.html (756 words)

	FM/AM Stereo receiver - Patent 4388496
		The sum signal (L+R) thus obtained from the AM demodulator 15 and the difference signal (L-R) from the integrator 14 are supplied to a matrix circuit 16, which performs an addition and a subtraction of the sum signal (L+R) and the difference signal (L-R) to produce a right signal (R) and a left signal (L).
		The limiter 11 and the FM demodulator 12 are employed in both cases of reproducing the stereo signal of the FM stereo broadcasting by the FM stereo receiving system and the stereo signal of the AM stereo broadcasting by the AM stereo receiving system.
		1, reproducing the stereo signals (R) and (L) of the AM stereo broadcasting as is the case with the embodiment of FIG.
	www.freepatentsonline.com /4388496.html (5734 words)

	Fanfare "AMAX" AM/FM tuners, monitors, demodulator receivers
		When AM went through its own renaissance a decade ago, it was hoped that its new stereo capability would revitalize a market that had suffered badly with the onslaught of high quality FM-stereo broadcasting.
		For the non-stereo AM station, one reason might be the capital required to finance the installation of AM-stereo transmission equipment.
		As for AM, there is no evidence at all that DAB on the AM band is even workable, let alone economically feasible.
	www.fanfare.com /amax-nws.html (864 words)

	AM
		Tony Eastley presents AM Monday to Friday from 8:00am on ABC Local Radio and 7:10am on Radio National.
		AM is Australia's most informative morning current affairs.
		Duncan Chessell says that reaching the top of the mountain was the culmination of three weeks of arduous hiking across Antarctic terrain, much of which had never been explored by human beings.
	www.abc.net.au /am (747 words)

	100 milliwatts & more: Part 15 low power AM FAQ
		A: This depends on where you are located and how you define “broadcasting.” In the United States, Canada and some other countries, the law permits you to radiate very weak signals in the broadcast bands as long as you do not interfere with licensed stations.
		A: In the FM broadcast band (88 to 108 MHz), you are limited to a field strength no greater than 250 microvolts per meter at a distance of 3 meters from the transmitting antenna.
		There is much more energy in an AM signal when the modulation level is at 90% than when it is at 50%, so a compressor/limiter helps to boost your range by keeping your modulation level as high as possible for as much of the time as possible.
	www.geocities.com /raiu_harrison/mwa/part15faq.html (2613 words)

	Say No To IBOC (Site not responding. Last check: 2007-10-19)
		The first thing wrong with it, and certainly not the most troublesome, is the fact that AM stations will no longer be able to broadcast analog AM stereo as the IBOC exciter uses phase modulation, just like Kahn and Cquam do.
		This is the method of using 2 receive antennas to pull in the broadcast.
		AM broadcasting has been around even before KDKA in Pittsburg signed on the air in 1919.
	www.wbdhradio.com /html/say_no_to_iboc.html (546 words)

	dcrtv.com - Washington DC/Baltimore Area AM Radio (Site not responding. Last check: 2007-10-19)
		Started broadcasting in 1955 but WDMV was off the air for a few years in the mid-1990s.
		Currently, the station broadcasts a Central American/Mexican flavored format dubbed "Radio Capital." 730 had featured the WBZS calls, but they were were dropped in October 2000 in favor of WKDL (which had been on Mega's 1050 AM in Silver Spring).
		United Broadcasting Corporation bought the station in the 1950s and moved the station from Washington to Rockville, locating the station in a house at the corner of Rockville Pike and Viers Mill Road.
	www.dcrtv.com /mediawa.html (6223 words)

	AM Stereo (Site not responding. Last check: 2007-10-19)
		With Kahn the full AM carrier is always transmitted and the upper and lower sidebands are both present much of the time, they just contain different audio.
		Using the 2 AM radio technique to detect Kahn uses what is known as slope detection where the AM receiver is deliberately de tuned to detect the phase modulation swinging about the carrier.
		Nighttime skywave co channel interference is worst at the top of the AM band, but for antenna height, wavelength and ground resistance hurdles, and available frequencies, we had to choose 1570.
	www.wbdhradio.com /html/am_stereo.html (1777 words)

	FM Transmitters from DJROCK DOT FM
		The FCC and Industry Canada do permit broadcasting on the commercial AM and FM bands without a license provided power levels are kept low.
		This is typically referred to as 'micro-broadcasting' since the coverage range of a 'clean and easily detected' signal stays within a 1/4 mile of the transmitting antenna.
		Licensed AM radio stations use towers that are electrically insulated at the bottom from the earth so the entire tower in effect becomes the broadcast antenna.
	alphazee.webstrikesolutions.com /djrockdotfm/faq.htm (588 words)

	WGVU Broadcasting
		IBOC is a way of efficiently broadcasting a digital signal with the existing analog signal at the same time.
		The AM digital signals would be able to achieve the equivalent of analog FM stereo quality.
		This competitive grant program is available to public broadcasting stations and non-profit organizations that construct facilities to bring educational and cultural programs to the American Public using broadcasting and non-broadcasting telecommunications technologies.
	www.wgvu.org /home/digitalconversion.html (5611 words)

	AM broadcasting Summary
		AM radio is radio broadcasting using A mplitude M odulation.
		History AM was the dominant method of broadcasting during the first two thirds of the 20th century and remains widely used into the 21st.
		Get the complete AM broadcasting Summary Pack, which includes everything on this page.
	www.bookrags.com /AM_broadcasting (119 words)

	AM Radio - AOL Music
		AM radio began with the first, experimental broadcast in 1906 by Reginald...
		The AM Query allows users to search for information about AM radio broadccast stations.
		Download, listen and watch AM Radio music, mp3's, song lyrics, music videos, Internet radio, live performances, concerts, and more on AOL Music.
	music.aol.com /artist/am-radio/555877/main (130 words)

	History of American Broadcasting (Site not responding. Last check: 2007-10-19)
		Broadcasting magazine special issues of 1962 and 1970
		A Broadcasting article from 1947: "142 FM Stations Operating in 33 States"
		I also maintain these sites: History of Broadcasting in West Virginia, Some History of Tampa-St. Petersburg Radio, and a page about WDBS, the old campus radio station at Duke University.
	members.aol.com /jeff560/jeff.html (261 words)

	AM88 LP AM Transmitter
		The AM88 is a low power AM broadcast transmitter designed for low power hobby and experimental use in the standard AM broadcast bands used in most areas of the world.
		It is also possible to use up to 100 mW and a 10 foot maximum antenna at certain frequencies in the AM broadcast band without violating FCC part 15 rules.
		In addition, QRP CW or AM operation is possible on the 160 meter amateur band (1800-2000 kHz).
	www.northcountryradio.com /Kitpages/am88.htm (410 words)

	The AM STEREO Page
		There's no doubt about it, Chris and Scott had a great time and the staff at KCJJ were most cordial to their guests.
		In an effort to keep an accurate list of all AM stations broadcasting in stereo, I am asking for individuals from areas such as the central and western Canadian provinces, deep southern US, the desert south western US, and any US territories to help add stations to my ever-growing list.
		This AM DXers Webring site is owned by Alex K.
	users.hfx.eastlink.ca /~amstereo (1284 words)

	LPAM.info - Low Power AM Broadcasting (Site not responding. Last check: 2007-10-19)
		You have reached the brand new resource for Low Power AM (LPAM) Broadcasting technical howto and information.
		The site is brand new so there is some information missing, but eventually this will be a complete technical resource for LPAM broadcasters.
		We just finished work on The Low Power AM Broadcasters Handbook, a first ever book for LPAM broadcasters.
	www.lpam.info (80 words)

	Radio Prague launches digital test broadcasting on AM - 29-10-2003 - Radio Prague
		It's good for domestic broadcasting, for FM stations rather than for AM stations.
		Radio Prague is a short-wave broadcaster and therefore we are looking forward to see what results DRM has at the moment because it's interesting for us.
		It is being developed for a few years by an international consortium where there's a number of producers such as Sony and as well as broadcasters.
	www.radio.cz /en/article/46813 (755 words)

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