Archive for the ‘Antique Radios’ Category

The satellite radio industry is dominated by two major players – Sirius Satellite Radio and XM Satellite Radio. Both companies charge a monthly fee for their services, but service payment plans often change to attract more customers. For example, starting in 2005 Sirius offers a $500 fee that is valid for the lifetime of the equipment. Sirius offers 65 music channels, without any commercials and traffic and weather reports for most of the major US cities. On the other hand, some of XM Radio’s channels did contain some commercials, but in much smaller quantities than those found on terrestrial radio channels. Today, XM has 67 commercial-free music channels, 21 channels with detailed traffic and weather information, 39 channels of news, entertainment and sports and an amazing number of 23 play-by-play sports channels. XM Satellite Radio Inc. owns the most impressive digital radio equipment and facilities, boasting over 82 end to end broadcasting studios. Sirius Satellite Radio is located in the heart of New York City with a huge recording studio. Sirius Satellite Radio has an impressive library of over 2 million music tracks.

Sirius Satellite Radio

Sirius Satellite Radio is one of the two main providers of digital radio broadcasting in the United States and it shares this important market with XM Radio. While you would think that XM and Sirius are 100% rivals, you will be surprised to find out that both companies are working together on a joint program in order to develop a receiver for both of their broadcast frequencies. Sirius uses three geosynchronous satellites that pass over the United States territory at regular time intervals and transmit the data alternatively. The Sirius satellite network is also located in a position that offers better line of sight – this means that transmission interruptions caused by trees, mountains or any other landscape form are less likely to happen. Sirius announced that the number of subscribers to their services goes beyond the 4 million count

XM Satellite Radio Inc

XM Satellite Radio Inc. began broadcasting in 2001 and has seen a continuous development ever since. The digital radio used by XM Satellite Radio Inc. is encoded using the CT-aacPlus technology which is broadcast in a 128kb/sec format that is high in fidelity and is similar to CD quality. XM Satellite Radio Inc uses two Boeing HS-702 satellites which are constantly orbiting the Earth at a height of 22 300 miles. IN order to minimize transmission ad reception loss, XM Satellite Radio installed terrestrial transmitters in most major cities in places where loss of signal is more likely to take place (tunnels, high building areas). XM radio claims to have an impressive number of over 6 million subscribers.

Working with the automobile industry

Both satellite radio providers saw a huge market in the car industry, so they began negotiating with al major car manufacturers to convince them to offer their services and equipment as standard or optional on the vehicles they produce. Some of the auto manufacturers that have either XM or Sirius satellite radio installed from the factory are: BMW, MINI, Rolls-Royce, Chrysler, Dodge, Mercedes-Benz, Jeep, Ford, Lincoln, Mercury, Volvo, Land Rover, Jaguar, Mazda ,GM, Cadillac, Buick, GMC, Vauxhall, Saab, Honda, Hyundai, Kia, Nissan, Infiniti, Porsche, Lexus, Scion and Audi – to name just a few. Sirius has managed to get exclusivity from major car manufacturers such as Audi or VW2007 through 2012. IT was a major success for Sirius as Audi and VW previously also offered XM radio services and equipment on their vehicles. After conquering the vehicle industry both manufacturers tried to move the success of satellite radio into the homes of consumers by creating some trendy portable satellite radio receivers. XM satellite radio created the XM2go™ line of “walkman-like” receivers and Sirius developed a variety of portable devices, such as the Kenwood Portable Satellite Radio Tuner, Here2Anywhere and the Sirius S50. More attempts are being made for introducing satellite radio in the homes of conservative media consumers.

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Dec

The Development Of Digital Multimedia Broadcasting

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Satellite radio systems are actually part of a larger group of broadcasting mediums, which specialists refer to as Digital Multimedia Broadcasting or DMB. This digital transmission system is used in order to send data to different receivers such as radios, television sets or mobile phones and PDAs. There are two different ways of using digital multimedia broadcasting – S-DMB which is broadcasting via a satellite or T-DMB which uses terrestrial emitters. The complexity of the entire digital multimedia broadcasting field is huge. Out of all the features and characteristics digital broadcasting offers, satellite radio is probably the most spectacular as it generated immense interest and triggered an intense competition between the two main satellite radio broadcasters, Sirius and XM Radio. The development of satellite radio and other forms of digital broadcasting is spectacular because it offers two main qualities that terrestrial emitters are deficient in: quality and coverage. In the case of satellite radio, for example, the sound quality from a satellite broadcast is much higher than AM or FM broadcasts, as the hissing noises and transmission disturbances are eliminated.

Technical features of digital multimedia broadcasting – overview

Whether it refers to television, satellite radio or cell phone transmissions, digital multimedia broadcasting is based on the Eureka 147 DAB standard. Digital television uses the T-DMB which is made for transmissions on frequency bands III (VHF) and L (SHF). T-DMB is an ETSI standard (TS 102 427 and TS 102 428).

T-DMB uses MPEG-4 Part 10 (H264) for the video and MPEG-4 Part 3 BSAC or HE-AAC V2 for the audio. When it comes to satellite radio, there were a few issues to be resolved by the main satellite radio broadcasters. The satellite radio receiver needs to be in the line of sight of the satellite to receive the transmission – and there is the problem of having different landscaping objects block the direct transmission. Land based devices were installed in order to eliminate the lack of direct satellite transmission. Since the wider spectrum of broadcasts has to be covered, digital multimedia broadcasting uses OFDM-4DPSK modulation and a chip of T-DMB receiver is also provided by MPEG-2 Transport Stream De-multiplexer. This helps reduce the negative effects of shadowing and fading, present in many digital transmissions.

The future of digital multimedia broadcasting

The transfer from the analog world to the digital one is obvious in all fields of work. Since digital multimedia broadcasting is developing so quickly, there is a silent battle going on between the new age digital technology and the classic analog one. OF course, many compare the transition from the analog to the completely digital era with the way audio cassettes were replaced by CDs and later on even DVDs. However, the development of digital multimedia broadcasting is slower since it happens on so many levels at the same time. Digital television is taking us into new spaces that are basically hybrids of the features of regular TV and characteristics of the Internet. Satellite radio is also taking huge leaps forward, with more and more programs having satellite radio exclusivity. There are even discussion of moving events like the MLB exclusively on satellite radio, which would provide one of the first deadly strikes against terrestrial radio broadcasting.

Digital data transmission is fast and accurate, and so far reality proves that the satellites used in order to facilitate broadcasting and reliable. Most digital multimedia broadcasting companies that own satellites also have backup ones ready to go in orbit and replace a defective one. Some other benefits of digital multimedia broadcasting recommend it as a next step in the development of broadcasting. From the consumer’s point of view, the quality and interactivity options of digital TV or satellite radio broadcasts are important features. Although most digital multimedia broadcasting channels and technologies are still complex and sometimes expensive, the evolution of digital broadcasting seems to be here to stay.

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Dec

XM Radio Categories

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Here are the main music categories that you can find on XM satellite radio broadcasts:
The Decades – songs from the 40s, 50s, 60s, 70s, 80s, and 90s

Country – classic country hits are at home here, but you will also get a good share of new pop country and blue grass country.
Hits – this is for all hit lovers out there. Packed with Top 20 on Channel 20, the hits XM Radio channels also include some FM channels: KISS FM in LA or Houston’s Pop FM station, KMIX. You also get MTV and VH1 stations and if you’re in the mood for some popular love songs you can tune into The Heart and Lite channel. Another interesting channel is Cinemagic, where you will be able to listen to all your favorite movie soundtracks without being bothered by commercials. There are also two Christian rock channels and a classic alternative channel.

Rock – XM Radio features 10 commercial free channels dedicated to rock:
* Deep Tracks: classic and contemporary hits
* Bone Yard and XM Liquid Metal: the first channel goes with classic hard rock while the XM Liquid Metal plays hardcore metal.

* Fred: there is a lot of classic alternative music, some 80s alternative rock and punk music
* Top Tracks: classic rock tracks
* Unsigned: unsigned bands
* XMU, XM Café, the Loft, XM Music Lab: soft rock, eclectic rock and any other rock type that doesn’t fit anywhere else
Urban – rap and hip hop, both modern and from the 80s.

Jazz & Blues – 6 channels altogether out of which four are commercial free
Dance – techno and trance music rules here, but you also get some disco music
Latin – 5 commercial free channels of Latin, Spanish and Mexican hits.

International Music – 5 channels of music from around the world. You might find these five channels a welcomed break from all the music you are used to. Fresh music from around the world is presented daily.

Classical – classical music from both famous and less renown classical musicians. You get the XM Pops, XM Classics, Vox and Fine Tuning. As you would expect, all 4 channels are commercial free.
Kids – Radio Disney and XM for Kids. Excellent programs that will keep your kid busy and happy for a long time.

News – you will get Fox News, CNN Headline News plus other TV related news channels. They feature XM commercials.

Sports – you will get channels like ESPN Radio, ESPN News, Fox Sports Radio, Sporting News, NASCAR Radio. These channels cover most of the important sporting events in the United States but you can also get international sports news here.
Comedy – both family oriented comedy stiles and uncensored comedy bits. These channels are commercial free, which is really enjoyable.
Talk & Variety – there are different talk channels and shows that are really engaging, such as E! Entertainment Radio, ABC News and Talk, Buzz XM, Ask channel, The Power and Family Talk. However, these channels have plenty of commercial time which is a bit of a disappointment from a paid subscription service.

Variation and content

These are the things both XM Radio and Sirius are after. With over 100 channels, each provider is able to identify and target all the important age and social groups in the United States. When it comes to music, there are extremely specialized channels on XM Radio, so the consumer knows exactly what kind of music they will run into on that particular channel. The kids channels are pretty good and the sports channels are also ok. If you like to get your news TV style, XM Radio’s choice of channels is also interesting. The fact that commercials are present is not that bothering, as they are only allowed to play 6 minutes of commercials per hour. However, some of the music channels are kept 100% commercial free, which is good news for music fans who do not want their audition to be interrupted by intrusive commercials.

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Dec

How Does Satellite Radio Work?

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Satellite radio is one of the biggest improvements in broadcasting since the introduction of FM. Satellite radio signal can be broadcasted for more than 35,000 kilometers (22,000 miles) with complete clarity and high quality sound. You will never get static interferences while listening to over 100 radio channels. The idea behind satellite radio has appeared in 1992, when the United States Federal Communications Commission granted a spectrum of the S band (the 2.3 GHz frequency) for Digital Audio Radio Service. The license to broadcast in that band was allocated to Sirius Satellite Radio and XM Satellite Radio in 1997. Now there are three companies that provide satellite radio in the world: Sirius and XM in Northern America and WorldSpace in Asia, Europe and Africa.

Each of these companies offer different broadcasting systems, since the radio signal of each is proprietary. This means that you will have to buy different hardware depending on your subscription to one of these companies. However, there are three components common to all satellite radio services: the satellites, the ground repeaters and the radio receivers. Different satellite radio companies broadcast the radio signal in different ways. For instance, XM satellite radio uses geostationary satellites which have orbits that are synchronized with the movement of Earth. These satellites are located above the equator. In order to allow subscribers to receive crystal-clear signal despite obstacles such as buildings, hills or bridges, XM satellite radio service has installed a network of repeaters antennas that receive the radio signal from the satellites and retransmit it to the subscriber’s receiver Sirius, on the other hand, uses satellites that have unique elliptical orbits around Earth. These kinds of orbits allow satellites to get higher in the sky than geostationary satellites and this prevents loss of signal. This is the reason why Sirius has fewer terrestrial repeaters than XM.

Satellite radio services have digital broadcast centers where a huge amount of music in digital format as well as CD format is stored. Radio programmers have the task of selecting which song has to be played at which time. There are also a lot of studios managed by digital radio companies where artists perform live. All songs and material are transmitted to the satellites in digital format so that the signal contains very high quality sound. The signal is encoded by the satellite and then retransmitted to the repeaters antennas, which then transmit it to the radio receiver which decodes it and plays the sound. The entire process is very quick and reliable. Satellite radio would not be possible without digital compression. Digital compression is a technique that uses sophisticated algorithms to compress as much material as possible on the available bandwidth. Once you make a subscription to a satellite radio provider you will need the appropriate radio equipment. Traditional radios cannot decode the signal received from satellites so you will need special equipment.

The popularity of satellite radio has exploded due to many technological advancements that enabled manufacturers to offer the receivers at very attractive prices. The fact that satellite radio is commercial free for many of its channels is also a major selling point.

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The recent development of satellite radio received a lot of newspaper and web page space, as well as plenty of attention from traditional media channels. There are a few things that are changing rapidly in satellite radio, changes that may or may not affect the future of the XM and Sirius Satellite Radio companies, as well as the consumers. A few major steps towards the dynamic development of satellite radio have given consumers and financial analysts different perspectives from which to analyze this phenomenon. With the MLB moving away from terrestrial radio and heading for digital radio transmissions, with a Playboy Satellite Radio channel that has over a million subscribers and several other impressive developments, we can say that satellite radio is on an ascending path. An abrupt one, filled with shock news and unexpected developments, but ascending nevertheless. An interesting idea is the one that XM and Sirius are working on a single receiver unit that can receive broadcasts from both major satellite radio broadcasters. Another event that rocked the satellite radio world was Howard Stern’s online streaming on Sirius. His appearance on the Sirius Satellite Radio gave a new light on the Sirius company, as one that offers more than radios and broadcasting means – as one that offers genuine content.

Terrestrial versus satellite

One of the problems XM and Sirius have had is with making the satellite receiver something desirable, cheap and effective. In the beginning the satellite receivers were large and expensive, and performed poorly on moving vehicles. Of course, the modern satellite receivers are much better, very small and compact and offer excellent reception in any area. The digital quality of the satellite radio has some amazing benefits on its own since there are no noise disturbances that were traditional to FM and AM broadcasts. Both XM Radio and Sirius Radio can be picked up on all the US territory and they are also available in some parts of Canada and Mexico. Since the direct line of sight from the satellite to the receiver may often become obstructed by landscape or buildings, land based devices were installed in order to eliminate the lack of direct satellite transmission The broad range of broadcast and the superior sound quality have taken satellite radio high in the preferences of the consumers. On the other hand, terrestrial radio has some strong points of its own. To begin with, it’s free and readily accessible to anyone. Also, terrestrial radio is so common, widespread and easy to use that anyone can enjoy it and most people don’t find it hard to actually create their radio stations. Many people are reluctant to move on to satellite radio, which is more complex and complicated.

The end consumer – the real winner

In this battle of the radios, the end consumer is the one that gets the most benefits. And since the competition got even more fierce when satellite radio started taking away subscribers of regular radio, things have gone one step further. Also, the competition between XM Radio and Sirius is in the benefit of the subscribers. An interesting aspect of the competition between the two satellite industry giants was realized by Interoperable Technologies – a joint effort funded by both Sirius and XM Radio, with the intention of bringing dual-subscription satellite radios to the general market. Analysts expect to see even more development in this direction, with XM Radio and Sirius entangled in a strange relationship, where they are working together on one project and battling it out on the satellite radio broadcasters market. In order to understand the way online streaming develops and the changes in the way satellite radios work we have to keep an eye open to the industry giants but also to the companies looking to obtain a license from the FCC. One thing is certain, however – no matter if satellite radio or terrestrial radio come up with new ways of attracting customers, the end users are the ones who will always come on top.

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1
Dec

What Is Satellite Radio

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Satellite radio is often considered one of the biggest improvements in broadcasting since the introduction of the FM band. Satellite radio is also called subscription radio or pay-radio because it is only available trough subscription to one of the satellite radio providing companies. Satellite radio follows a concept similar to cable television by providing a very wide range of programs which are not available in the traditional FM or AM format for a fee.

Satellite radio uses satellites to deliver radio programs to subscribers. The radio signal is broadcasted from Earth based stations to communicational satellites, which then redirect the signal to satellite radio receivers. The radio signal is broadcasted by communication satellites to a much larger area than traditional terrestrial radio antennas. For example, satellite radio is available al across the continental area of the United States. Satellite radio is available now in most parts of the world trough services provided by companies like WorldSpace (in Europe, Asia and Africa), Sirius and XM Radio (in North America). The radio signal you receive using satellite radio is digital, which means that it is always clear and static-free, which is one of the great advantages of satellite radio. Another great thing about satellite radio is that it is almost completely commercial-free.

To begin listening to satellite radio you will need the actual satellite radio (also known as tuner or receiver), a satellite radio antenna (which is often incorporated in the satellite radio) and a subscription to the service you choose. There are several types of satellite radio from which you can choose. One of them is the dedicated car or home radio, which play trough your car or home stereo. A second option is the plug-and-play radio, which can be used in your car, as well as in your home by paying a single subscription. Your third option is the portable radio, which has rechargeable battery, a built-in antenna and you can listen to it wherever you go using headphones. The radio signals offered by different satellite radio companies are proprietary, which means that you will need different hardware for receiving, decoding and playback, depending on your subscription. Each satellite radio receiver has its own serial number called Radio ID. When you get your subscription, you will also get an activation code for your receiver. Besides the actual radio programs, satellite radio transmits metadata that contains the name of the artist, the title of the song or program, as well as the name of the channel. This makes it easier for you to decide which channel to listen to and which program to choose.

Satellite radio services provide the subscriber with more than 100 programs that vary in content from rock and jazz to rap and classical music. But satellite radio’s utility reaches far beyond listening to your favorite music without the interruption of those annoying commercials. Satellite radio also offers exclusive sports programs, cultural and educational shows, news and talk-shows. Some of the celebrities that have moved their shows from free radio to satellite radio include Howard Stern, Opie and Anthony, Bob Edwards and Martha Stewart. Unlike terrestrial radio, satellite radio is not affected by bad weather or even calamities.

At first, many people wondered why they should pay for radio if they can get it free. However, satellite radio attracts more and more people every year due to its great advantages: no commercials, extensive reach, theme programs and exceptional quality of sound.

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Dec

XM Radio Information

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XM Satellite Radio Inc. is one of the major players in the satellite radio industry, with over 2 million subscribers and spreading all over the American territory. XM Satellite Radio Inc. deliver over 120 channels of radio to an ever expanding customer number. Here are some of the characteristics of XM Radio:
Corporate headquarters: Washington, D.C.
Date of launch: November 12, 2001
Satellites in service: 3
Available satellite radio channels:150
Monthly subscription cost:$12.95

XM Satellite Radio Inc. is the owner of one of the 2 FCC approved licenses for delivering digital radio in the United States. Since it only shares the field of Satellite Digital Audio Radio Services (SDARS) with Sirius Radio, XM Satellite Radio Inc. has plenty of room to develop and expand. 2001 was the year when XM Satellite Radio Inc. began broadcasting – progress was slow at first, but soon after satellite radio began skyrocketing as a social and economical phenomenon. Since it was the first national digital satellite radio service provider, XM Satellite Radio Inc. captured an important share of the market and started offering music programs and other types of shows and channels like talk shows, sports, comedy, science and news. XM Satellite Radio Inc. owns the most impressive digital radio equipment and facilities, boasting over 82 end to end broadcasting studios. The digital radio used by XM Satellite Radio Inc. is encoded using the complex CT-aacPlus technology which is broadcast in 128kb/sec format – very close to CD quality. The signal produced by using this technology makes the transmission much clearer and more accurate than any analog radio provider could ever offer. There are no noise disturbances that were often present with FM and AM broadcasts and the transmission is crystal clear. The fact that the signal is received in digital form solves many noise disturbance problems and the output is close in fidelity to the original track.

The XM Satellite Radio Rock and Roll satellites

XM Satellite Radio uses two of the most potent commercial satellites, which are constantly orbiting the Earth at a height of 22 300 miles. The two Boeing HS-702 satellites have some inspired names – “Rock” and “Roll”. The first of the two satellites, Rock, was launched in orbit on March 18, 2001 and is currently positioned at 85 degrees West Longitude. It services the western half of the United States and complements the range and area of coverage of its younger “brother” – Roll. Roll was launched on May 8, 2001 and it currently positioned at 115 degrees West Longitude, and it services the eastern part of the United States. The combined coverage of the two satellites spreads beyond US borders and reaches areas like Canada or Mexico. This is an interesting feature of satellite radio, as it further points out the benefit of not having to switch radio stations during long trips or while moving over the border. For emergency purposes, the company has third redundant HS-702 satellite on the ground, ready to replace Rock or Roll if any of them fails. Both satellites use different transmission frequencies which prevents interference.

Using the XM radio transmission

The powerful broadcast signal used in satellite radio means that you only need a small receiver in order to be able to listen to digital radio. These small omni-directional antennas are similar to GPS devices and do not require mechanical pointing in order to receive the signal. Some of the new features of satellite radio refer to the extended broadcast information abilities. XM offers information about the broadcast type, and includes the song title, artist, and genre of music. As a recent improvement, XM radio also started broadcasting weather related news and traffic statuses on their programs. In order to use the XM Radio programming you need a XM Radio receiver, an antenna and a subscription to the XM services. Different music equipment producers have teamed up with XM Radio in order to allow adding XM broadcasting to their already existing devices. Some vehicle manufacturers are also offering XM Radio as a factory installed option.

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Dec

The Technology Behind Satellite Radio

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Any song you hear on satellite radio stars as a recording in a specific format on different recording mediums. IN most cases, the recording quality has to be maintained fairly high, usually around 384kb/s, while also being reasonably small enough to be transported on CDs and DVDs. The music tracks used in satellite radio are cataloged using a similar system to the MP3 cataloging criteria, the ID3 tags. The choice for the music tracks that will be played is made by each channel individually. The DJ selecting the tracks usually chooses about 20-30 minutes worth of music. The DJ has to listen to the tracks to make sure they are in proper condition and then simply lets the computer decode the original file. The same thing is repeated once the initial 20-30 minutes are exhausted and the music playing cycle repeats itself.

Sound encoding in satellite radio

Encoding is one of the key elements of digital radio. Each channel is handled by a different encoder. The encoder basically takes the analog file and turns it into a digital one. The digitalization process is made in real time and the music files are transformed into 1′s and 0′s. This process is carried out by powerful computers that analyze sound waves and frequency and break them into binary code. The encoding process is carried out at 128kb/s, 44.1Kh which is actually CD quality. After the song is encoded, it is transmitted to a multiplexer where other channels are also present – the multiplexer basically takes all the channels of the satellite radio provider and combines them into a single broadcast transmission. The data is then sent to a satellite modem device which modulates the data and sends it to the broadcaster’s satellites, using unique transmission frequencies.
What happens above the Earth
Here is where the satellites are located. They receive the transmission and transmit it to the receivers we have in our homes and cars. The satellites are located at 23,000 miles above us – both Sirius and XM Radio use satellites located at this distance from the Earth. The satellites are located in geo-sync, which means that hey orbit above the location they are designated to service at all times. When the satellite receives the transmission encoded at 128kb/s, 44.1 khz it rebroadcasts it to the geographical area it covers. Both Sirius and XM Radio use satellites that cover certain areas of the United states – mostly the East and West coasts. For example, one of XM Radio’s satellites covers the western part of USA, probably an area located roughly from Seattle to San Diego on the West and Minneapolis to Houston on the east. The increased sound quality is possible because the broadcasted data (music tracks, news, sports transmission) don’t get sliced up too many times in the decoding process.

The antenna

The antenna connected to your satellite radio receiver picks up the transmission on L-Band. The recent technological advances have allowed digital radio broadcasters to create receivers small enough to fit mobile locations. In the early days of satellite radio, a large parabolic dish would have to be mounted on the car in order to receive signal. Also, before the more compact receivers were created, the early satellite radio receivers needed electronic movements that directed the dish towards the satellite line of sight. Modern flat panel receivers have eliminated all the problems of their predecessors and can be fitted almost anywhere without taking up too much space.
The receiver and the output
The receiver is the device that decodes the data, basically doing the exact opposite of what the encoding process was like. After receiving the signal from the antenna it amplifies it and converts it to usable sound. The car or home audio system is then able to play the selected satellite radio channel. The rest of the process is exactly like analog broadcasts would work, with an amplifier and speakers outputting the sound.

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30
Nov

Sirius Satellite Radio Overview

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Together with XM Radio, Sirius Satellite Radio is one of the two main providers of digital radio broadcasting in the United States. Sirius Satellite Radio currently broadcasts on over 120 channels with a variety of broadcasts including music, talk shows, news broadcasts and different other forms of audio entertainment. Sirius Satellite Radio covers the entire US territory. The high quality of the broadcasting signal produced by using the most advanced digital encoding technology makes the transmission clear and accurate. The fidelity of the sound transmitted digitally is much better than any analog radio provider can offer.

The noise disturbances often associated to FM and AM broadcasts are now eliminated and the transmission is clear and almost identical in quality with the original track. Sirius Satellite Radio holds one of the two FCC approved licenses for delivering digital radio in the United States. The digital radio broadcaster only shares the field of Satellite Digital Audio Radio Services (SDARS) with Sirius XM Satellite Radio Inc. Here is some more information on the Sirius company:

Corporate headquarters: New York City, New York
Date of launch: July 1, 2002
Satellites in service: 3
Available satellite radio channels:120
Monthly subscription cost:$12.95
Sirius Satellite Radio is truly an impressive corporation. Located in the heart of New York City with a huge recording studio situated in the Rockefeller Center, Sirius Satellite Radio has a huge library of over 2 million music tracks. The quality of the transmission is very high as it is in the 128kb/sec format – which is similar to CD audio quality. The company uses digitized signals through the PAC encoding technology, providing high fidelity broadcasts all over the United States.

The Sirius satellite

The three Loral SS/L-1300 commercial satellites used by Sirius deliver constant digital radio broadcasting to Sirius’ subscribers. As with most commercial satellites, the Loral SS/L-1300s orbit above the Earth at 22 300 miles. Very similar to XMs satellites, the Loral SS/L-1300 commercial satellites have a more inclined orbit which allows them to cover an even more extended area. The elevation angle of 60 degrees is more generous than the regular 45 degrees used by geostationary satellites. Since one of the most problematic aspects of satellite radio broadcasting is the line of sight – which can be easily interrupted by landscape or buildings – the Loral SS/L-1300 commercial satellites have a slight advantage over their competitors, since they have a clearer line of sight. The three satellites used for broadcasting slowly orbit around the Earth and only two of them are functional at any time.

This is because Sirius only has two transmission frequencies and by alternating satellite transmission they can eliminate interferences while also having a spare satellite to put to use in case something goes wrong with one of the others. The 3 satelites take turns broadcasting – when one of them leaves the footprint of the continental U.S. another picks up the broadcasting transmission. Since the more inclined orbit provides better coverage, Canada and Mexico are also well covered by the digital broadcasting. This is an interesting feature of the Sirius satellite radio, as it enhances the benefit of not having to switch radio stations during long trips or while traveling outside US borders. Sirius has also announced a collaboration with the Canadian Broadcasting Corporation and Standard Radio Inc. This would allow anyone in Canada to benefit from Sirius’ services while using any of the Canadian English and French channels.

Sirius broadcasting

Because the broadcast signal used in satellite radio transmission is so strong, you only need a small receiver in order to be able to listen to it. By using small omni-directional antennas you can take your digital radio programs wherever you are – either on the road or at home. The technology used is similar to GPS devices and the receivers don’t require pointing. Some of the new features of satellite radio refer to the extended broadcast information abilities, and the transmission can supply information on artist, music title or genre. One of the developments Sirius is working on is streaming video broadcasting – something that will probably become available to the general public soon after the technology and broadcasting methods become secure enough.

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3
Aug

Antique Radios – Intro

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