Tuesday 21 December 2010

Night Vision WiFi Cameras - Extremely Useful And Versatile

The Grand WiFi Camera Pro Model II Night Vision camera is an extremely versatile system with the ability to serve as a webcam, security cam or to record multimedia content.

The camera is totally wireless and can be used to monitor or watch a baby from anywhere in the world. It can do the same for a door, or barn or swimming pool, to help deal with children sneaking in to use private pools and prevent drownings or other injuries. The camera sells with everything needed for installation to a network and the manual is downloadable from the internet.

The camera is compatible with wireless LAN 802.11g (54Mbps), and also supports 802.11b (11Mbps). The camera can support 640 x 480, 320 x 240, and 176 x 144 formats. The camera will also easily switch from USB to IP cam modes with provided cables for IP mode and a button on the camera itself.

The bundled software allows MPEG 4 capture, automatic replacement of the oldest saved video files when space is no longer available and a motion detector which can sound an alarm when motion is detected.

The camera does have requirements. These are a router (with DDNS or PPPoE function), 10Base-T Ethernet or 100Base TX Fast Ethernet, Intel Pentium3 800 MHz, AMD 800 MHz or Faster processor, 64M RAM or above, VGA card with 8MB memory or above, Microsoft DirectX 9 and Internet Explorer 5.0 or above. The system does not come with a self contained power source, and thus requires a power connection.

There are six infrared LED's to allow the use of the night vision mode.

The camera currently sells for $136 and ships around the world. The camera operates in Operating Systems in several languages, English, Spanish, Dutch, German, Italian, Russian, French, Japanese and Traditional Chinese while the manual is available in English, German, Dutch and French.

The obvious uses of the camera include serving as a movable security camera, as part of a web conference system to allow the camera to be moved easily about a physical conference room to facilitate the view of people at other sites or even as a means of keeping an eye on something from far away, from the baby mentioned above to a display at a zoo or even a soft drink machine. These cameras can be used to watch outdoors pets at night, or farmers can use this system and a signal repeater to keep watch on barns or fields. For webconference use, this camera appears desirable due to the ease of moving around a conference room, allowing the users to switch from one location to another for the convenience of the off-site participants.

In theory, a user can even use this camera to create a home security system, not up to professional standards, but certainly capable of seeing what is stealing the dogfood or knocking over the trash cans at night. It might even be used to see how squirrels are breaking into the squirrel-proof bird feeders.

Thursday 16 December 2010

Cell Phone Signal Boosters: All of the Pieces Explained

Cell phone signal boosters, also called amplifiers or repeaters, work by capturing a weak cell signal outside the home, office, car, boat, warehouse, etc, bring it inside, amplify it, and redistribute it. The most popular products on the market contain four main components: the outside antenna, the amplifier (booster / repeater), the inside antenna, and the cabling to connect everything.

The Outside Antenna

The outside antenna can be omni-directional (can capture signal from all directions) or directional (works best when pointed directly at a cell tower). The benefit to omni-directional antennas is that they are easy to install and pick up/radiate signals in a 360 degree horizontal plane. They are great for picking up and transmitting to multiple towers for multiple carriers. You want to mount them as high as possible where the signal is strongest. A couple disadvantages of omni-directional antennas: 1) their gain is typically lower than directional antennas. 2) They are more prone to other RF interference. TheCellphone-Mate CM100-Sis a good example of a popular omni-directional outdoor antenna.

The benefit to directional antennas (Yagi antennas) is that they typically provide more signal gain (power) than omni-directional antennas. They are also less prone to other RF interference. Because they provide more gain, the tower can typically be much further away than is acceptable for an omni-directional antenna. The Wilson 304411 Wide Band Yagi is a good example of a popular directional outdoor antenna.

The Amplifier

Just about every amplifier (or booster) will have two values that basically define it. The first is "band". Most amplifiers are classified as single band or dual band. With the exception of iDEN (Nextel), single band refers to either 850 MHz or 1900 MHz, meaning that the amplifier only boosts one of those two frequency ranges. Dual band on the other hand will boost both frequency ranges. While there are certainly reasons for purchasing a signal band booster, dual band boosters are more common and compatible with just about every carrier.

The second value is gain and just about every signal amplifier will have this specification published. Without getting too technical, gain is defined as the ratio of output to input. When specifying electrical power, gain is measured in decibels or dB. dB numbers are derived from a fairly simple logarithmic function; however all you need to know is that every increase in 3 dB doubles the power.


10 dB = gain of 10
13 dB = gain of 20
16 dB = gain of 40
19 dB = gain of 80
20 dB = gain of 100
30 dB = gain of 1,000
40 dB = gain of 10,000
50 dB = gain of 100,000
60 dB = gain of 1,000,000

If you have been shopping around for a cell phone signal booster then you have probably come across these numbers and were not sure exactly what they meant. Now, hopefully you have a better understanding.

When searching for an amplifier for your particular application, please reference the following:


20 dB - Automobile, Boat - 4ft. antenna separation or direct connect
30 dB - Automobile, Boat - 5ft. antenna separation or direct connect
40-45 dB - Large Auto, RV, Large Boat - 6ft. to 20ft. antenna separation
50 dB - Small Home, Townhouse, Office - 40ft. to 60ft. antenna separation
55 dB - Medium Home, Office - 50ft. to 70ft. antenna separation
60+ dB - Large Home, Office, Warehouse - 70+ft. antenna separation

Please keep in mind that this table represents general rules of thumb and the recommended applications and distances may vary by manufacturer. Antenna separation is very important and should not be overlooked when choosing or designing your system. Antenna separation is the straight line distance (in 3 dimensions) from the outside antenna to the inside antenna. In practice, these distances can be somewhat shorter than the rule-of-thumb distances listed above due to ceilings, walls, fireplaces, metal roofs, brick fireplaces, etc. blocking or inhibiting a straight-line signal path. The rule of thumb antenna separation distances are to keep your amplifier from going to oscillation. In the audio world, this is analogous to getting a microphone too close to a speaker and producing feedback.

The Inside Antenna

Inside antennas, just like outside antennas, come in different shapes and sizes, serve different purposed and can be omni-directional or directional. A lot of the products from Wireless Extenders (Wi-Ex) have a small omni-directional antenna attached to the amplifier itself. While this makes installation fairly simple, the unit must become part of your home décor as it must be installed in a central location and will be visible. Most in-building products from manufacturers such as Cellphone-Mate, Digital Antenna, and Wilson Electronics will have a separately mounted internal antenna. This may sometimes make them more difficult to install, but having a separate indoor antenna allows for the most flexibility when choosing a central coverage point. The most popular antenna for providing omni-directional internal coverage is the ceiling-mounted dome antenna, such as the Cellphone-Mate, Inc. CM222. They even make low-profile dome antennas and even dome antennas which resemble light fixtures, which are less obtrusive and mesh well with any home décor.

Inside antennas can be directional as well. Wall-mounted panel antennas provide directional coverage in typically a 90-120 degree radiation pattern. While coverage is only provided pretty much in front of a directional antenna they usually offer more gain than a dome antenna. With that being said, panel antennas are great for large but somewhat narrow rooms or hallways. They are also useful if you are not able to fully adhere to the antenna separation requirements. If the indoor directional antenna is pointed away from the outdoor antenna you will most likely be able to get away with a less than recommended antenna separation distance.

The Cabling

The cabling and connectors used to connect the outside antenna to the amplifier, as well as the inside antenna to the amplifier, play a crucial role in how your system will perform. Depending on the product, different types of cabling and connectors can be used. Some of the Wi-Ex and Wilson Electronics products use standard RG6 or RG59 75 Ohm coax. This is the same coax used for your cable TV or satellite system. While this type of cabling is less expensive, there are some drawbacks. For cellular and PCS frequencies, on average, RG6 will lose 6-10 dB of signal per 100ft. Depending on the actual length of cable you use, this can sometimes provide more signal loss than the outside antenna provides in gain. Remember, you want your amplifier to receive the highest level of signal possible. For this reason, it is recommended that runs using RG6 should be no longer than 50 or 60 ft. For most other in-building cell phone signal boosters LMR-400 50 Ohm Coax is the standard. In comparison, while LMR-400 is more expensive and thicker, it only loses about 3-6 dB per 100 ft for cellular and PCS frequencies respectively.

Based on this, LMR-400 can be run further than RG6 before there is a decrease in system performance. For all three-piece systems (outside antenna, amplifier, inside antenna) it is recommended the amplifier be installed as close to the external antenna as possible, using the shortest cable possible. Ex. If the external antenna is installed on a roof, it is recommended the amplifier be installed in the attic as opposed to the basement. The shorter the cable length between the external antenna and the amplifier, the better. Remember that there is no separation requirement between the antennas and the amplifier, only between the antennas.

Thinking about purchasing a cell phone signal booster? Please check out the author resource box for more information.

Wednesday 15 December 2010

Pagers - An Overview

A pager is a device used for telecommunication that receives and transmits both alert and warning messages. Pagers run on small batteries for long periods. This kind of gadget is appropriate for people, who wish to take phone a phone call but are not in vicinity of a telephone to return or make a call immediately.

Until recently, pagers were regarded as only receiver devices. There are two reasons, firstly, cell phones with two-way communication are easily available than pagers. Secondly, the manufacturing difficulties arising while designing a pager that has enough signal range.

A pager that can both receive as well as send data is known as a two-way pager. More often, a cellular phone can replace a two-way pager. This innovative and unique system uses huge quantity of repeaters, letting wireless transmitters function at less power and having short antennas for reaching the repeater at any point within the coverage area. Usually a two-way pager is no big than pocket calculator and has a small inbuilt keyboard with an LCD (liquid crystal display), which displays simple graphics and several text lines depending on pager model.

Next, paging across nation refers to paging services that function just not in one area or city, but in an entire country. Nationwide pagers normally work only if it is switched on or is in the coverage area. If your pager is outside coverage area, the system of pager will save the messages for ninety hours only.

The installation of paging systems can be carried out in various types of environments, mostly those environments that demand to combine reliable communication with flexibility.

In fact, pagers are also a lot more easy to carry wherever you go, as they are very lightweight, extremely portable and work for greater duration after charging properly.

Monday 13 December 2010

DECT telephones and Avaya Wireless Solutions

Telecommunications is considered by most economists, socialists and political experts to be one of the most important components of any successful organization. This has been the case for some time now. However, the introduction of internet and the advancement of technologies have made the telecommunications industry much more specific. In terms of ground realities for a small or medium scaled company, this translates into the need for a wireless or Digital Enhanced Cordless Telecommunications system. One company that has been in the forefront of new telecommunication technologies is Avaya. As a result, it is no surprise that the company has already garnered a huge chunk of the global market with its offerings of wireless and DECT phones. The following are the details of what the company offers to clients in need of wireless or DECT Avaya phones and solutions.


The 3700 Avaya phones series:
The one concern that most entrepreneurs and Organizations in the field of communication or wireless DECT is the risk of vulnerability. Avaya solves this problem without batting an eye, incorporating the latest technology to prevent unauthorized access or illegal. In addition, greater mobility and guidelines DECT conformation allows the user to have a stable network and highly productive communication have. This series includes four models.
The Avaya 4000 series phones:
Modelsfalling in this series are available in two groups on the basis of technological differences. The first type is the traditional DECT model that will be connected to the communications network through TDM, while the second type is the SIP DECT model that hooks up with LAN to become a part of the communications systems. This series also contains four models.
The 7400 Avaya phones series:
Like all the above mentioned series, this one also epitomizes everything about having wireless communication connections. Providing any of the phones under this series to employees will allow an organization to improve employee productivity, enhance customer service and save up on a lot of communications related expenses. This series is especially advanced and consists of four models of phone, a repeater, a base-station, a controller and an external antenna.
The wireless Avaya phones series:
There is a significant technical difference between the technologies of wireless communications and DECT. The company also offers wireless Avaya phones to clients who would not or cannot use DECT technology. The benefits, needless to say, are the same as using DECT phones. These include more productivity, a variety of features to choose from and customize and increased availability of employees. The wireless series consists of two IP wireless phones and two WLAN phones.

Wireless and DECT technology is slowly going to be central to all communication systems throughout the world. The use of DECT phones and wireless communication systems from Avaya is particularly useful for organizations whose employees travel to the campus around the home much. However, this does not mean that organizations with no immediate needs should the technology side, because only by virtue of this technology is used, a significant improvement in any organization, and sometimes even lead to efficiency gains andturnovers.

Friday 10 December 2010

Monitoring Your Security Alarm System

Central station monitoring is the most valuable part of your alarm system for both you and the Alarm Company that has the pleasure of providing you with this service. For the alarm user the peace of mind that comes with knowing that help is on the way when needed is always welcome and often insisted upon. For the alarm dealer, the recurring revenue that comes from this side of the business is what sustains them.

Monitoring firms come in all sizes. The largest are UL (Underwriters Laboratory) listed facilities with Fort Knox like security. These facilities have large backup generators as well as the ability to instantly switch your signals to the closest available station in the case of a natural or man made disaster. There is great stability in doing business with these firms due to the fact that your account will rarely be sold to another company, who would constantly raise your monitoring rates. Small alarm dealers use monitoring agreements as a way of infusing cash into their business as often as needed, To them your account is like stock.

The largest National and International companies are at an advantage because they have a great number of facilities, and are able to provide local monitoring for their clients. Local monitoring is preferred because you are less likely to loose a signal if it is coming over a local phone line. An example of this is as follows. Lets say you live in the central US and your alarm is being monitored on the east coast over an 800 number telephone line. If a storm knocks out the phone lines between you and the monitoring station, how would they receive your signal for help?

The smallest firms could be a couple of people taking turns watching a digital receiver in a home office. These are undesirable because you may not be able to depend on them when needed. Your personal information is also at risk, due to a potential lack of security in this type of facility. All of the advantages of the large well- funded central stations are reversed when your alarm dealer saves money by doing business with these smallest of companies.

Monitoring stations large and small all have the same function. When your alarm is violated it sends a digital signal to the monitoring stations receiver. The receiver takes only a few seconds to decipher where the signal is coming from and what type of response is required. This information is than translated by computers and a dispatch screen is shown to the first available dispatcher. The dispatcher connects to the proper authority and relays your systems request for a response.

On most non- panic situations the monitoring station should call the house before they dispatch to the proper authority. If you answer the phone and give the correct password they should disregard your signal as a user error. If you give the wrong password, the better monitoring stations will say "Thank You" hang up and dispatch for a holdup/ hostage situation. This is yet another great people protector that is built into your monitoring service.

If you are not home to answer the call a dispatch will be made and the monitoring station will begin at the top of your call list in hopes of contacting you or your agent with a warning of dispatch. This is not so you will go check; it is so you will not walk into a dangerous situation. Looks like another one of those people protection features when used properly doesn't it? This process of dispatching and then calling you or the people on your call list has come under the microscope of late, and many municipalities are adjusting this process. More about ECV (Enhanced Call Verification ) is posted on the "Experts Know" web-site at the provided link.

Your local authority, based on how the signal is reported to them, prioritizes dispatch responses. Your monitoring company should also have dispatch protocol based on the signal type.

A request for a response to a hold up or distress will usually take precedence over a burglary signal.

A request for an ambulance should be dispatched immediately and a phone call to the house made afterwards.

A request for a fire dept. response should be dispatched immediately and a phone call to the house made afterwards.

A distress call made by the use of an ambush code or panic buttons should trigger an immediate dispatch with no phone call to the premise.

An alarm signal dispatch that is trailing a burglar through a protected area such as:

Violation-

Zone 1 entry, front door.

Zone 5 main floor motion detector.

Zone 3 Upstairs hallway motion detector.

should excite your local authorities into a quicker response, as they are sure it is most likely not a false alarm. This type of reporting format is called "Extended Reporting" and while some cities require it to help prioritize dispatch, most do not. It is always available to you if your control is capable of reporting that way and you request it. Now that you know about it you should ask for it by name.

The alternative dispatch that would just say "Burglary signal coming from the Jones residence 123 any street" and would most likely become a lower priority response.

A monitoring facility that monitors alarms for other local dealers as well as their own installed systems needs a way to control the quality of the systems it monitors, if it is going to have its dispatch requests trusted by the authorities. Some large facilities will monitor only the systems that are capable of sending the most sophisticated signals. When a company such as this limits the amount of false alarms it reports, it will earn a better response record.

If there are many signals coming into a monitoring station at the same time, the signals can only be handled as fast as an operator can get to them. The number of trained employees it has on duty will limit the small to medium size companies. The largest firms have the ability of employing many dispatchers at the same time. One such company that I have worked with has over 700 on duty every day, every shift.

(TID-BIT!)

The National average for an alarm dispatch is 13 minutes. The largest firms can boast a 60- second or less average.

Monitoring your alarm is not only its greatest feature, but is also one of the few services of which I can say with confidence " You will most likely get what you pay for." The smallest dealers will monitor your alarm for sometimes half the monthly fee of the largest dealers. Now that you know a few of the differences of this end of the business, I would hope you make the proper decision based on your understanding how important this service is to the protection of you, your loved ones, and your other irreplaceable belongings as well.

I implore you not to cut corners on your choice of monitoring services!

(HOT TIP!)

Many municipalities require an alarm permit to be purchased by the alarm user. If a dispatch is made without a permit on file you could receive a hefty fine or worse yet a failure to respond. Some permit holders are charged a one- time fee and others have to renew annually. Check with your alarm company if there is a permit requirement in your town. This way you can avoid being surprised by an unexpected expense.

Phone Hookup- Most alarm's report over your existing phone line. You don't need another phone line for the alarm. People that have DSL (Digital Subscriber Lines) can still use their line for alarm reporting but a filter will need to be installed on your DSL line. If you do not have a phone line you will have to have one installed for alarm monitoring service, or consider one of the alternative methods of transmitting your signals made available to you by your alarm dealer.

Line Fault Monitor- Many of the high- end alarm systems have a line fault monitor built in to them. The mid-range systems have the ability to have one added and the low-end systems are often too simple to even consider this device. The line fault monitor is always on the lookout for an available phone line. If your line goes down while your alarm is armed it will cause an alarm. This way if a burglar cuts your phone line outside of the house or business they will hopefully run, due to all the noise drawing attention to their intentions. If your alarm is not armed, there will be no sirens but the keypad will beep rapidly and let you know that your communication link is down.

Many people think that if the phone line is cut and the line fault monitor goes into alarm there will be a dispatch. This is false because if there is no phone line to carry the signal it has no way of getting to the monitoring station, unless you have an alternative communication system as a backup. Instead this type of alarm will protect you if you are at home by:

Letting the burglar know that they violated a system hopefully causing them to flee.

Giving you an opportunity to call 911 from your cell if one is available.

Allowing you to prepare to defend yourself and your loved ones.

Giving you time to see if all that dog food you have purchased over the years is going to pay off.

Line Seizure- Any quality alarm installer will take the time to make sure that your phone line is set up for line seizure. There is no additional equipment needed to accomplish this feature of phone line protection. The phone line is run from your interface jack outside of your house to one of the closest phone jacks inside. It is then run from that jack to the next and this process is continued until your electrician during construction or the Phone Company has wired all of your phone jacks.

The alarm installer that is in a hurry or doesn't know any better will tap your alarm into the closest phone jack. The problem with this is that if a burglar picks up any of the phones that are between the outside interface jack and the jack your control is tapped into it will stop the transmission of your alarm signal.

The knowledgeable and concerned installer will run your control phone line directly to the outside phone interface assuring that it is first on line. They will then run from the control to your first phone jack making it second on line. When an alarm is violated it will seize the phone line completely for its own use and return service to the house after the signals have been sent to the receiver in the monitoring station.

Long Range Radio- This is a radio transmitter that is used by many large monitoring firms to monitor your alarm instead of over a phone line. The Transmitter sends a radio signal to a repeater much like your cell phone does, and the repeater sends your signal to the monitoring stations receivers in a local station. Many customers that need an increased level of security use the radio transmitted signal and the phone line transmission simultaneously.

This level of protection obviously costs more than the average homeowner would care to pay. Even as a stand alone system the radio signal is less likely to be interrupted than a phone line that is exposed outside your home or business.

Cellular Communicators- This is a communicator that is wired to your alarm control and processes the signals over the cellular communication towers. Most applications I have seen for this device have utilized it as a backup to a phone connection. However I have seen it used as a sole means of communication for the alarm system in a few cases where long range radio and a phone lines were not available. You would have to purchase the usually expensive cellular communicator separately, because it is not built into your alarm control.

Alarm owners that use Long- range radio and cellular communicators as a backup reporting device usually have to pay an additional monitoring fee. As an added measure of security, the alarm companies will often send these backup signals to a separate monitoring central station. This assures two complete dispatch processes from different operators at different locations, thus increasing the level of security.

Opening and Closing Reports- Most of the average to high-end systems have the ability to report enough data to create opening and closing reports if desired. Opening and closing reports are named as such, because they are mostly used in commercial applications to log the times and users that are opening and closing the business.

There are different levels of opening and closing reports. Some of the most common are listed below as examples:

(Supervised) This type of report lets assigned code users open and close at will, if within the specified window of normal activity. It will log the event into a report that can be forwarded to a report manager at a pre- determined frequency or upon request. If a code user opens or closes outside of a pre-assigned schedule of normalcy it will trigger a supervisory phone call to a manager.

(unsupervised) This type of report lets assigned code users enter and exit at will. It will log these events and can be checked by a supervisor upon request.

I have seen supervised opening and closing reports used in a residential situation on a few occasions. You can for example contact an elderly relative's refrigerator door and have a phone call made to you if it does not open within a predetermined amount of time. Or you can set it to have you notified if the kids come home early from school. You can imagine how many creative ideas you can come up with if you want to.

(INSIDE SCOOP!)

The Alpha Keypads and controls of many high-end systems allow you to scroll through and read the last 100+ events. By having one of these systems you can create your own opening and closing controls and reports without having to bear the monthly expense of this service. The small amount of dollars spent on this upgrade will pay for itself in a hurry.

Paging- Many of the alarm systems have an onboard paging device so you can receive the time and code user of each event such as arming and disarming when opening and closing reports are programmed to the on position in your alarm control. You will also receive a code for alarm violations and the zone or zone numbers that are violated during an alarm breach. You would have to have a digital pager for this to work and once again your teenagers are going to hate how much you now know about alarms!

Other articles you should read when considering who will monitor your Alarm System are:

Alarm Systems and VoIP

Alarm System ECV Will Effect All Alarm Users in 2006

These articles are posted on The Experts Know! Alarms web-site

Tuesday 7 December 2010

Ham Radio Operators

CLUBS

Club meeting Day always fell on the first Friday of each month, which makes it the most interesting day of the month. Each gathering would begin with registration or sign-in, the reading of the preceding months meeting, announcement of new memberships, and payments of membership dues and so on.

New Amateur Radio operators are likely to perceive these meetings as great learning opportunities such as choice of station equipment, and operating practices. If you're an old-timer, it's an opportunity to get together once a month with acquaintances and share ideas and experiences. The Amateur Radio Clubs Members ranged in age from 10 to over 90 years old. Members were requested to bring hand-held two way radios to swap-meets, field day events and communication drills. Members also had access to the clubs line phone patch and other functions of the repeater for testing and PL control. Members were active in a number of specialized areas including Field Day, Contesting, Digital Modes, EMCOMM and ATV. Members had a wide and varying interest in the hobby.

In general, amateur radio operators are different in that they are licensed and allowed to build and alter their radio communication equipment with the purpose of the advancement of technical knowledge and skills. While the members for that of Citizens Band radio clubs are allowed to promote communication practice and public service, but no hands-on or experimentation or altering of internal adjustments of licensed equipment allowed. Technical Update Members of many Amateur Radio Clubs are actively at work to enhance the facilities and the functionality of club stations and its member's stations.

Over the years amateurs have banded together in cooperation with the junior high school, Senior high school and college faculty giving amateur radio classes and helping form the Amateur Radio Clubs, these are strong and active clubs in the schools today. Most of these clubs are equipped with two way radio repeaters having wide area coverage.

Amateur Radio Clubs are committed to serving the general public by making available communication in emergencies when cell phones repeaters and civil communications radios are disabled or less than reliable. Some Amateur Radio Clubs construct Web Sites and make them available to better serve their members - informing them of the clubs Points of Interest and Upcoming Events. The clubs offer License testing at scheduled times. The license classes are: Technician, general and extra. Study for your examination. Go web site http://www.arrl.org. Have fun.

Monday 6 December 2010

High-Speed Satellite Internet Brings You the Best in Radio

A significant bonus when you install a satellite Internet system is access to the wonderful array of satellite radio broadcasts available through the airwaves. These radio stations offer an excellent alternative to the sometimes fuzzy and cracking radio stations broadcasting from terrestrial radio towers.

Two or three satellites can blanket an entire continent with signals, unlike line-of-sight broadcasts for terrestrial networks. The only thing standing in the way of this form of high-speed Internet or excellent radio is a clear view of the southern sky. Once you've achieved that, you're on your way.

Various satellite radio services offer you a variety of news, weather, sports, and music channels, all through your satellite radio receiver. Most are commercial-free: an added bonus when you're paying a subscription price!

This form of radio works on the same principles as satellite Internet or television. The satellite system is installed, pointed at the satellite orbiting the equator of the earth, and the receiver is turned on. Anything the owner subscribes to, like radio, Internet access, or television programming, becomes available through the local service provider.

Satellite radio providers beam signals 22,000 miles out into space. The satellites send those signals back to earth to be picked up by antennas sometimes as small as golf balls. With signal boosters, the power of the radio signal isn't lost over distances. Dozens of channels are squeezed into a relatively small bandwidth, making the system very efficient.

Some satellite radio providers used fixed antennas, but it's possible to listen to satellite radio in your car, too. In cities, where there are many obstacles to a clear view of the southern sky, signal booster antennas called "repeaters" are located on buildings and at other sites to boost the satellite radio signal. The satellite radio providers use their own company satellites to send the signals, so there's no overlap with Internet or television bandwidth.

To keep the signals from degrading, the stream is encoded once, sent up to the satellite, and then sent to your satellite radio receiver, where it's decoded for the last time. There's no degradation of signal from re-broadcast, re-store, and re-encoding the signal multiple times.

It's fascinating how the hundreds of stations have access to so much digital music. DJs are known as "programmers" in the satellite radio business, and they point and click on the material they want to play. Massive digital libraries store up to 250,000 CDs, and those libraries are constantly being updated.

The digital radio signal stays consistent and is unaffected by the roof of your house or car. In cities, where buildings or trees can block satellite signals, repeater antennas keep the signal strong. Unlike a stationary or standard satellite dish, the direction of the antenna (latitude, longitude, and elevation) isn't important.

When you subscribe to satellite Internet service, it's relatively easy to have access to online radio stations and satellite programming. Once you've installed your high-speed satellite Internet dish, look into adding a subscription to satellite radio to your package. The variety of programming is truly amazing, and you'll find plenty to enjoy.