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Topic: AM stereo


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In the News (Tue 23 Jul 19)

  
  NationMaster - Encyclopedia: AM stereo
AM stereo is any of a number of mutually incompatible techniques for broadcasting two-channel audio in the mediumwave band in a manner that is compatible with receivers designed for standard amplitude modulation.
AM stereo is popular in Japan because of the limited number of FM stations in that country, and in Australia possibly because AM stations are more suited to covering large sparsely populated regions than FM stations, and the fact that unlike the American FCC, Australia was quick to pick a single standard (C-QAM).
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.
www.nationmaster.com /encyclopedia/AM-stereo   (1915 words)

  
 AM Stereo-Equipped Stereo Systems and Tuners
TU-D99AMX - Tuner with Multi-System AM Stereo reception.
TU-S77AMX - Tuner with Multi-System AM Stereo reception.
TU-S772MX, TU-S777AMS - Tuners with Multi-System AM Stereo reception.
ourworld.compuserve.com /homepages/kevtronics/home2.htm   (553 words)

  
  C-QUAM - Wikipedia, the free encyclopedia
C-QUAM is the method of AM stereo broadcasting used in Canada, the United States and most other countries.
As with the subcarrier used for FM stereo, the audio in the C-QUAM signal is the stereo difference — the left channel "minus" the right channel (L − R).
Also, since some stereo information is contained in the sidebands, adjacent channel interference can cause problems.
en.wikipedia.org /wiki/C-QUAM   (385 words)

  
 AM STEREO BOOK REVIEW
The AM stereo decision can be read as a success or failure depending on your take of regulatory agencies, but you would have a difficult time convincing Braun this proceeding was successful.
AM Stereo and The FCC is a complete case study, eminently usable as a textbook study on management, decision making in science and technology, regulatory practise, political economy, or mass communications law.
In fact, tests of AM stereo are documented as early as 1958, though during this time period the Commission was really only concerned with FM stereo and perhaps for good reason.
www.oswego.edu /~messere/AMstereo.html   (1277 words)

  
 The AM Stereo Tech Zone
This page is for the promotion of AM Stereo for enthusiasts with technical info on tweaking your AM Stereo receiver plus articles and graphs with the pros and cons of various systems.
Studying AM stereo has been both a technical and electornic education and information presented here is the product of that and if I seem partial to ISB and linear synchronous detection it's because that I am.
It is much simplier than an AM Stereo decoder to build and could be assembled and installed in a short period of time.
www.hal-pc.org /~jsgil/AM-Stereo   (1647 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 through the modulated stage of the transmitter, and ATU/antenna system.
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   (1520 words)

  
 High Definition AM Stereo World Tuner
Rest assured that this analog AM stereo tuner is like none sold on the market today, and will add an exciting new dimension to your personal high fidelity system.
AM stereo tuners are so extremely rare today, that many that are offered for sale at premium prices via auction sources are approximately 20 years old.
For many years, very high quality AM studios and transmitters have been operating, but due to the mediocre performance of many available AM receivers, people perceived analog AM fidelity to be of inherently poor quality.
meduci.com /amx2000.html   (4260 words)

  
 AM-FM stereo - Uncyclopedia
The conspiracy came close to being unveiled in the late 1980s as many AM stations attempted to broadcast drivel in low-quality stereo instead of the even lower-quality monaural drivel they normally transmit.
they just took all the outdated AM-mono equipment already on their warehouse shelves, advertised it as "AM-FM stereo" (on the pretext that, while the AM was rubbish, the FM was stereo) and the public lapped it up, too brain-dead to notice the difference.
Realising that they had been outsmarted once again, AM radio broadcasters turned off the stereo signal and went back to crappy monaural audio, then to talk radio.
uncyclopedia.org /wiki/AM-FM_stereo   (233 words)

  
 Radio AM to FM   (Site not responding. Last check: 2007-09-26)
Numerous posts on the Yahoo Groups AM Stereo Forum have been quick to point out flaws in the AM version of Ibiquity's HD Radio, formerly known as IBOC for In-Band, On-Channel digital, a broadcasting system that places a digital signal inside the analog signal.
AM broadcasting only sounds bad because of the quality of receivers manufactured since the early 1970s...
Yet until broadcasters voluntarily restricted their bandwidth to an upper frequency of 10 KHz to help reduce interference in the band, AM was actually capable of higher fidelity than FM: While the FM standard calls for a high frequency cutoff of 15 KHz, the old AM standard allowed for 20 KHz.
members.cox.net /rwagoner/columns/2002/sep2002.html   (518 words)

  
 Ramsey Electronics Forum: AM transmitter ----AM STEREO anyone?
C-Quam is the worldwide standard for AM Stereo broadcasting and would offer compatibility with all AM Stereo radios, however because of its different phasing, the Kahn system allows the Stereo audio to be received by using two regular mono AM radios.
It's the old "two-radio" trick that Kahn AM Stereo stations advertised when that system was allowed to be used in the 1980s; you would take two similar AM radios with analog tuning, place them side by side like Stereo speakers, and tune one slightly to the left of the station's frequency (i.e.
The simplest AM Stereo system to build a transmitter for is the defunct Magnavox system, which used simple phase modulation for the L-R (Stereo Difference) component.
www.ramseyelectronics.com /cgi-bin/ultimate/ultimatebb.cgi?ubb=get_topic&f=1&t=000030   (2048 words)

  
 Broadcasting History - Various Articles
The number of AM stereo stations will multiply rapidly in the weeks ahead if the Harris system, another of the four processes vying to become the de facto standard in the U. by winning the acceptance of broadcasters and receiver manufacturers, wins type acceptance soon.
The dawning of AM stereo was not as dramatic as it might have been simply because there are no AM stereo radio sets available to consumers.
Everybody wanted the promotional advantage of laying claim to be the first AM stereo broadcaster in his market and most also wanted to give a boost to AM stereo, which is seen by many as the savior of AM broadcasting.
members.aol.com /jeff1070/am10.html   (8647 words)

  
 NASA - STEREO - The Sun in 3D
STEREO will become a key addition to the fleet of space weather detection satellites by providing more accurate alerts for the arrival time of Earth-directed solar ejections with its unique side-viewing perspective.
STEREO is in position and ready to get to work after its lunar flyby.
Comet McNaught caught by the Heliospheric Imager on one of the STEREO spacecraft.
www.nasa.gov /mission_pages/stereo/main   (565 words)

  
 Welcome To The AM STEREO Page!
For manufacturers of AM STEREO receivers, a similar requirement has been established in that their receiver must meet certain technical criteria with respect to performance in order for the receiver to be permitted to bear the AMAX logo.
STEREO AM" (An excellent slogan, I must say!) Prior to this, the majority of capital city AM stations in Australia had been broadcasting in stereo under a testing program sanctioned by Department of Communications with a proviso that no mention of this fact was to be made to listeners until after the official launch day.
To a stereo listener, the single channel is actually 6 dB louder than it should be, but this is considered an acceptable trade-off when the alternative is losing 6 dB of the monaural modulation to which almost all the audience is listening.
users.hfx.eastlink.ca /~amstereo/amstereo.htm   (9444 words)

  
 STEREO Web Site
The twin STEREO spacecraft recently completed their lunar swingby manuevers and will be in position to collect the first-ever 3-D images of the sun by April 2007.
The Delta II launch vehicle carrying the STEREO spacecraft hurtles through the smoke and steam after liftoff from Launch Pad 17-B at Cape Canaveral Air Force Station.
STEREO (Solar TErrestrial RElations Observatory) is a two-year mission using two nearly identical observatories, one ahead of Earth in its orbit and the other trailing behind.
www.stereo.jhuapl.edu   (233 words)

  
 The Ultimate AM Antenna   (Site not responding. Last check: 2007-09-26)
In order to receive clear AM Stereo signals -- on the TX-11b or any other AM radio, however, you have to have a good antenna.
The ground (shield) lead connects to the ground terminal of the radio, the center wire connects to the "external AM antenna" terminal of the radio.
Other ideas you may try are simple long wire antennas (good for distance or eliminating long-distance atmospheric noises) or if you are in an office that doesn't like the look of the "ultimate antenna," just placing a portable radio near a window.
members.cox.net /rwagoner/columns/am_antenna.html   (347 words)

  
 AM Stereo in the USA      (FCC) USA   (Site not responding. Last check: 2007-09-26)
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.
The Commission originally sought to choose a single AM stereo system as the standard for the AM broadcast band.
www.fcc.gov /mb/audio/bickel/amstereo.html   (756 words)

  
 RCA's AM Stereo System, Circa 1959   (Site not responding. Last check: 2007-09-26)
To the left is a photo of the equipment rack holding the RCA AM Stereo equipment installed at the WNBC transmitter, to convert it for AM Stereo operation.
The L+R stereo sum signal is feed to the normal AM modulation input of the transmitter, through the customary limiting amplifier.
This prototype AM Stereo Receiver is based on the chassis of an RCA Model XF-2 radio receiver.
users.rcn.com /jbyrns/RCA-AM-Stereo.html   (463 words)

  
 Patents in Class 381/16
Apparatus and method for processing stereo signals for application to an AM stereo broadcasting unit
Compatible AM stereo system employing a modified quadrature modulation scheme
Stereo presence signal for an AM stereo system
www.freepatentsonline.com /CCL381-16.html   (178 words)

  
 [RT] AM Stereo on the Expanded Band   (Site not responding. Last check: 2007-09-26)
Common sense would indicate that Expanded Band stations which had specified a Stereo Preference are required to broadcast in AM Stereo, but if such a rule exists, FCC enforcement of it has been nil.
Some Expanded Band stations transmit in full AM Stereo (my nearest example being 1680 WTTM in Princeton, NJ); some transmit mono audio over a stereo signal ("the light's on but nobody's home" scenario); and some transmit a pure mono signal.
However, the FCC's preliminary IBOC ruling says that Expanded Band stations which begin IBOC transmissions are released from their requirement to transmit analog AM Stereo (due to the non-compatible nature of these two systems), so the FCC apparently does recognize that such a requirement does exist -- at least in theory.
www.broadcast.net /pipermail/radio-tech/2005-May/072325.html   (320 words)

  
 NEW Fanfare AM-stereo (AM/FM)tuner/monitor   (Site not responding. Last check: 2007-09-26)
While other designs might extract economies by using sections of circuitry in common mode for both AM and FM, the FTA-100's AM and FM sections are fully discrete.
The FTA-100's AM section incorporates the latest AMAX* reception circuitry which, in its simplest form, combines the excellence of Fanfare's ultra low noise, standard AM reception with the strongest most viable platform for high quality AM-stereo.
Continuing the high resolution of its FM counter-part, no matter whether it is "talk" or "musical entertainment", the the FTA-100's new AM section promises you a whole new world of pleas-ureable listening.
www.fanfare.com /fta-100-sht.html   (1007 words)

  
 AM Stereo
Contrary to popular belief, AM stereo is alive and well across America and in other continents.
There are currently more than 200 AM stations offering stereo programming at some point during their broadcast day.
Commercials and jingles are often aired in stereo, as well as recorded and live music offerings.
spaces.msn.com /members/amstereo   (173 words)

  
 Patents in Class 381/15
Method for removing AM neighboring interference and a circuit for the same
Circuit for controlling operator indicators in an AM stereo receiver
Apparatus for processing stereo signals and universal AM stereo receivers incorporating such apparatus
www.freepatentsonline.com /CCL381-15.html   (197 words)

  
 Fisher Model 800-B AM/FM Stereo Receiver (1962)
One of the first receivers to support true multiplex FM stereo (the system in use today), it also supports the obsolete "FM-AM stereo" system that was used briefly during the late 1950s and early 1960s.
It has separate FM and AM sections, one on each side, with a magic eye for each tuner and the famous Fisher bird logo in the center.
It is also an outstanding stereo FM receiver, so it is practical and desirable radio to own, as well as historically interesting.
antiqueradio.org /fish02.htm   (2606 words)

  
 Hand-Made AM STEREO Radios & AM STEREO Decoders
It is none other than a custom-designed see-through AM STEREO radio featuring your station's logo.
This is one of the latest AM STEREO conversion projects of Chris Cuff.
These particular decoders were given to those AM stations that agreed to sign on with the C-QUAM system so that station engineers could convert their monitors accordingly.
www.geocities.com /amstereo2001   (1757 words)

  
 WLS AM Stereo 89 - The Rock of Chicago!   (Site not responding. Last check: 2007-09-26)
Things on AM 89 sailed along smoothly until Steve Dahl and Garry Meier were hired for afternoon duty on FM 95.
What wasn't planned was that AM Stereo never really caught on, despite the obvious difference in sound quality with the new receivers.
As time passed, a de-facto standard was agreed upon, but it was already too late for AM stereo to take hold, although a great deal of stations still broadcast in stereo today, including WLS.
www.wlshistory.com /WLS80   (1874 words)

  
 RWD - How to convert a stock 8-track player to receive AM stereo (with pictures! Lots of them. Dial up users beware.)
Unfortunately, I needed to be able to have the AM radio powered while the screws were disconnected, so I added this green wire as an additional ground.
In order to force the AM stereo decoder into mono, it required me to ground a particular pin (Pin 10) on the decoder board through a 1K ohm resister.
This works out well because it will turn off the decoder when the AM radio is not in use (when the FM radio is being used.) This prevents any interference from the Decoder causing problems with the FM radio.
www.brickboard.com /RWD?id=864201   (1182 words)

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