What Are Telescopes and Its Benefit?

A telescope "telescope" is an instrument designed for the observation of remote objects. The term usually refers to optical telescopes, but there are telescopes for most of the spectrum of electromagnetic radiation and for other signal types. An optical telescope is an optical tool that gathers and focuses electromagnetic radiation. Telescopes increase the apparent angular size of distant objects, as well as their apparent brightness. Telescopes work by employing one or more curved optical elements - lenses or mirrors - to gather light or other electromagnetic radiation and bring that light or radiation to a focus, where the image can be observed, photographed or studied. Optical telescopes are used for astronomy and in many non-astronomical instruments.

The main purpose of a telescope is to gather light, i.e. to collect and focus photons. We can think of a telescope then as a "light bucket" - the bigger the bucket, the more photons a telescope can collect.

Types of telescopes:
There are three basic types of telescopes -- Refractors, Newtonian reflectors, and Catadioptrics.

Newtonian Reflector Telescopes:
Newtonians usually use a concave parabolic primary mirror to collect and focus incoming light onto a flat secondary mirror that in turn reflects the image out of an opening at the side of the main tube and into the eyepiece.

Refractor Telescopes:
Refracting telescopes have an objective lens at the front of the tube. The light exits out through the back of the tube to the eyepiece. Since many observations are made high in the sky, a right-angle diagonal is used to avoid neck strain. This also provides an upright image making them suitable for terrestrial observations. A refractor has several advantages over other designs. The tubes are enclosed so that dust and moisture do not enter the tube, they have fixed optics that do not normally require collimation, and they do not have a central obstruction which reduces the light entering the tube. A refractor typically will give higher quality images of planets than other telescopes of similar aperture.

Catadioptric Telescopes:
Telescopes using a combination of both mirrors and lenses are called catadioptrics. There are many different designs. Examples of these are the Schmidt-Cass grain and the Maksutov-Cassegrain. Usually a full aperture lens is used to correct aberrations in a compound reflecting telescope. The corrector lens also increases the performance of the instrument as air currents are eliminated. The main advantage of the design is that, because the light path is folded back on itself, it provides a very portable, short physical length telescope with a long focal length.

Benefit:
1. The aperture of a telescope is several times larger than the aperture of human eye so that the objects that can not be normally seen by unaided eye can be seen. Light- gathering power of a telescope is proportional to the area of its aperture and hence depends on the square of the radius of the mirror. Therefore a 20 cm diameter telescope collects four times more photons than a 10 cm diameter telescope.

2. A telescope can be equipped to record light over a long period of time, by using photographic film or electronic detectors such as photometers or CCD detectors while the eye has no capability to store light. A long-exposure photograph taken through a telescope reveals objects too faint to be seen with the eye, even by looking through the same telescope.

3. A third major advantage of large telescopes is that they have superior resolution, the ability to discern fine detail. Small resolution is good. The resolution is directly proportional to the wavelength being observed and inversely proportional to the diameter of the telescope.


For more information on Telescopes visit our http://www.halfvalue.com and http://www.halfvalue.co.uk websites. (Bio)

How To Connect A Hidden Camera To Your Computer

Most hidden cameras today's are designed to be hooked up to a TV set for viewing only or to an old VCR for recording video surveillance and reviewing the camera video at a later time. Very few people know how to hook up a hidden camera to their computer so that they can record and view it using their computer. This article explains in detail what you need to purchase and how to install the components so that you can not only view and record hidden camera video surveillance on your computer but also view the video remotely through the Internet for free.

While most hidden cameras will most likely work with this setup we can only verify these hidden cameras will work for sure. The Hidden Camera VISEC Software-Hardware System is just the thing for making your hidden camera work with your laptop or desktop computer.

For a wired or wireless hidden camera you will need the GrabBee II to connect your camera(s) to your computer. The GrabBee II is the bridge between the wireless or hidden camera and your computer. The GrabBee II converts analog video signal to digital through your USB port. Plug & Play installation allows you to connect the number of cameras equal to the number of USB ports on your computer. Comes with software and all the connecting cables you will need to hook it up. GrabBee II

Installation Instructions:

If you do not follow these steps in their order you can cause damage to your computers Operating System. These steps are ONLY for Microsoft Windows XP and above. For all other Operating Systems (Windows 95/98/ME/200) please follow the instructions given in the manual, which came with the unit.

Before you begin:

* Make sure you have downloaded all of the windows updates, which are located at update.windows.com.

* Unplug all other USB Devices if possible.

* Close all other programs running besides the needed programs to run Windows XP.

1) First Connect the Grab Bee II to any USB Port on the computer.

2) Wait for the Found New Hardware Wizard to pop up. (Do not click anything at this point, please read the instructions all the way through first)

3) Insert the Multimedia Installation Kit CD (Red and Purple CD). When inserting the CD you may notice a box that pops up, it will say Video Home- 32BG. Click the Cancel button, and proceed to step 4.

4) On the Found New Hardware Wizard dialog box, click No, Not at this time, and then click next.

5) Click Install from a list or specific location (advanced), and then click next.

6) Now Click the BROWSE button, Then the + sign next to MY COMPUTER, locate the CD-ROM Drive you put the CD into, should say Video Home- 32GB next to it.

7) Click the + sign next to it, then locate the folder called Grab Bee 2, Click the + sign next to it and then proceed to click on the folder called driver.

8) Once you have clicked onto that folder, click the word OK, and then click NEXT.

9) The computer will now search that location you specified for a DRIVER for the Grab Bee 2 device which as been installed.

10) Once the computer finds the driver, a window will pop up that says: Hardware Installation, Click the Continue Anyway button and proceed to the next step.

11) Click Finish, and now your device is installed and ready for the software installation. The Visec program can now be installed from the disk you have purchased. Once the software is installed your system is ready to operate.

Now connect your hidden camera to the Grab Bee II. If you are using a wireless hidden camera, connect the 2.4Ghz receiver to the Grab Bee II.

VISEC Software:

The software that gets installed on the computer was developed as a next generation computer program by NASA Level Programmers.

This software has the following features.

* Watch your pets, nanny, babysitter even your kids!

* View from any location in the world via the Internet.

* Use your computer's IP address to log on and immediately view live or past video.

* Record all video activity, or just when motion is detected.

* In motion detection mode you can be alerted by email, cell phone or PDA when motion is detected.

* Can also be used as a stealth surveillance system allowing the program to operate secretly on your computer. Suspect an abusive nanny or cheating spouse? Simply set VISEC on 'secret' mode and record everything for possible evidence.

* VISEC is extremely easy to use. Installation and configuration will only take 5 minutes.

In the past, it was quite costly to connect a hidden camera to work with your computer. But with VISEC you can turn your computer into a powerful surveillance system at a fraction of a regular security system cost. VISEC has no monthly fees and, for a one-time fee, you can receive a lifetime of free updates.

Please Note:

When remote viewing via the Internet, you will get a snap shot every 6 sec. You are not actually viewing real time video.

Glenn Frieboth, owner of GLC Enterprises, Inc., authors the latest in Surveillance news and is based in Illinois. Find out more about a... (Bio)

The Invention of the Mobile Phone

Nowadays, the mobile phone is so important to us that it’s hard to think of life without it. However, they're a relatively new invention. This article explores the history of the mobile phone & questions what the future holds for it.

On 3 April 1973, Dr Martin Cooper, who was a Motorola employee, placed a call to rival Joel Engel, who was head of research at AT&T. Doctor Martin made the call while he was walking the streets of New York & did so through the first Motorola DynaTAC prototype in front of journalists.

The earliest mobile telephones were dubbed first generation telephones, often referred to as 1-G. These devices were the very first real mobile telephones, although they were then known as cellular mobile radiophones, & were based on analogue signalling. The analogue signal was the main difference between these first generation mobile telephones & their second generation cousins, which came out a few years later.

Second generation (2G) mobile phones were first released in the nineties. Unlike 1-G phones that were analogue, 2G phones use digital signalling to provide voice services & for text messaging & WAP internet access.

Some of the benefits of 2G phones are that they use lower radio signals, which require less battery power. This means that phones lasts a lot longer between charges, so batteries - & therefore the phones themselves - can be made littler. As well as this, 2G phones offer more privacy. Indeed, digital cellular calls are much harder to eavesdrop on than 1G phone calls.

The name 2.5G is used to refer to the phone technology that is post 2G, but not quite 3G. However, while the terms 2G & 3G are officially defined, the term 2.5G is not. In fact, this term was invented for marketing purposes only.

The earliest pre commercial 3G mobile phone network was launched in Japan in May 2001. Later, 3-G was released commercially in Japan on October 1 2001.

3G is the third generation of mobile phone standards and technology, which succeeded 2G mobile phone technology. The birth of 3-G technologies enabled network operators such as orange to offer their users a bigger range of advanced services. This includes broadband internet, as well as high tech video calls.

Despite the success of 3G, there's also been some complaints about it. These include criticism over the cost of 3G phones, as well as concerns over the lack of network coverage these phones get because it's still a pretty new service.

Ever since the launch of 3G mobile phone technology, people have been talking about 4-G. 4-G technology will signify the future of mobile telephones, creating the most sophisticated handsets & best services to date.

Maria Literral has worked in telecoms for over 20 years having spent time developing mobile communications and wireless telecommuncation... (Bio)

Find out The Types of Generators

Generators are used for the generation of electricity and they ensure that most of the essential appliances can be run whenever there is a power outage. Generators of different wattage capacities can be used according to the needs of the individual. The choice of buying the right type of generator depends upon a number of factors like the wattage capacity, voltage ratings, fuel type, fuel efficiency, noise level, portability and price – a prudent choice can only be made if you knew what to look for.

Stand By – Standby generators provide backup power in homes and offices and are permanently installed outside the house or office building. They are plugged into the electric circuits or home wiring. – The unit turns itself on and off automatically. They can automatically detect disruption in the usual electric supply and begin supplying power within a few seconds. – Propane and natural gas offer a safe, long-term fuel supply and are more environment friendly than gasoline or diesel fuels. – Like any motor, a generator motor creates quite a bit of heat and needs a cooling system to prevent overheating. Standby generators can be either air-cooled or liquid-cooled. The major difference is that air-cooled systems are louder and not quite as effective. Liquid cooled systems are quieter and more dependable – and also more expensive to purchase and to maintain.

Portable – Portable generators are usually used in places where there is no power supply such as construction sites, camps, etc. These generators are sufficient to run appliances like televisions, refrigerators, sump pumps and furnaces. – Portable systems are wheeled units that require to roll the generator outside, start it up, and hook it up to a power inlet box Portable generators supply electricity to selected appliances through extension cords. – They are fueled by gasoline, which can be difficult to store and transport during a blackout. Carbon monoxide is always a concern in the safe use of portable generators. – They are designed to be used for short periods of time only a few hours at a stretch. As a result, they tend to be much smaller and less expensive.

A related aspect of generator motors is the speed at which they run, as measured in RPMs. Generators made for the US market operate at one of two speeds: 1800 RPM or 3600 RPM. 1800 RPM motors will last longer and run quieter; 3600 RPM motors are smaller and lighter

Jason Uvios writes about "Types of Generators" to visit:electric power generators, rv generators and home generator. (Bio)

Do You Know What is the Difference Between Analog and Digital?

Difference Between Analog and Digital?

Analog and Digital
As a technology, analog is the process of taking an audio or video signal (the human voice) and translating it into electronic pulses. Digital on the other hand is breaking the signal into a binary format where the audio or video data is represented by a series of "1"s and "0"s. Simple enough when it's the deviceanalog or digital phone, fax, modem, or likewisethat does all the converting for you.

Digital versus analog can refer to method of input, data storage and transfer, the internal working of an instrument, and the kind of display. The word comes from the same source as the word digit and digitus.

The digital technology breaks your voice (or television) signal into binary code a series of 1s and 0s transfers it to the other end where another device (phone, modem or TV) takes all the numbers and reassembles them into the original signal. The beauty of digital is that it knows what it should be when it reaches the end of the transmission. That way, it can correct any errors that may have occurred in the data transfer. What does all that mean to you? Clarity. In most cases, you'll get distortion-free conversations and clearer TV pictures. The nature of digital technology allows it to cram lots of those 1s and 0s together into the same space an analog signal uses. Like your button-rich phone at work or your 200-plus digital cable service, that means more features can be crammed into the digital signal. Digital offers better clarity, but analog gives you richer quality. Digital like the VCR or the CD is coming down in cost and coming out in everything from cell phones to satellite dishes.

Phone lines

Digital lines are found in large, corporate phone systems. Though digital lines carry lower voltages than analog lines, they still pose a threat to your analog equipment.

Analog lines also referred to as POTS (Plain Old Telephone Service), support standard phones, fax machines, and modems. These are the lines typically found in your home or small office

There are digital-to-analog adapters that not only let you use analog equipment in a digital environment, but also safeguard against frying the internal circuitry of your phone, fax, modem, or laptop.

Cordless phone

The very nature of digital technologybreaking a signal into binary code and recreating it on the receiving endgives you clear, distortion-free cordless calls.

Cordless phones with digital technology are also able to encrypt all those 1s and 0s during transmission so your conversation is safe from eavesdroppers. Plus, more power can be applied to digital signals and thus, you'll enjoy longer range on your cordless phone conversations.

The advantage to analog cordless products? Well, they're a bit cheaper. And the sound quality is richer. So unless you need digital security, why not save a few bucks and go with an analog phone? After all, in home or small office environments where you may be the only cordless user, you won't have any interference issues.

Keep in mind, when talking about digital and analog cordless phones, you're talking about the signals being transferred between the handset and its base. The phones themselves are still analog devices that can only be used on analog lines. Also, the range of your cordless phoneanalog or digitalwill always depend on the environment.

Cellular Phones

Perhaps the most effective use of the digital versus analog technology is in the booming cellular market. With new phone activations increasing exponentially, the limits of analog are quickly being realized.

Digital cellular lets significantly more people use their phones within a single coverage area. More data can be sent and received simultaneously by each phone user. Plus, transmissions are more resistant to static and signal fading. And with the all-in-one phones out nowphone, pager, voice mail, internet accessdigital phones offer more features than their analog predecessors.

Analog's sound quality is still superioras some users with dual-transmission phones will manually switch to analog for better sound when they're not concerned with a crowded coverage areabut digital is quickly becoming the norm in the cellular market.

Better Sound Quality
Digital offers a better quality of sound. Proponents of digital claimed too that because digital scrambled up the signals into bursts, it was more secure than analog and can help thwart "cloning," an act of grabbing phone account information over the air in order to copy then resell that information for piracy purposes. By some industry estimates, close to $650 million in wireless services has been coveted by these big-eared crooks, which only adds onto the operator's bottom line a cost that is eventually passed on to the customer. Digital has stronger battery life than analog, and for the most part, better, more modern features on the phones.

For more information on Analog and Digital visit at http://www.halfvalue.com and http://www.halfvalue.co.uk websites. (Bio)

What Microsoft is trying to achieve with Windows 10?

When it comes to mobile operating system, Apple's iOS and Google's Android are ruling the mobile devices quite comprehensively and they are not going to let any other penetrate the mobile operating system market.

No matter how much money and willpower, third party mobile operating system put in, they just can't break the duopoly of these two leading mobile operating systems.

Despite its shrinking market share, which further slipped to 3.0% from last year's 3.6%, according to Strategy Analytics' statistics, Microsoft Corporation is still planning to hit back this year with its upcoming Windows 10 for mobile devices.

Chris Weber, Microsoft's head of mobile device sales, revealed at Mobile World Congress, that Washington based technology giant Redmond has agreed to launch its premium flagship smartphone brand this year, which will be powered by upcoming Windows 10.

With the launch of Windows 10, Microsoft aims to lure application developer companies and indie mobile app developers to build apps for its platform. However, just like its shrinking mobile operating system market share, there are not many application development firms and indie developers willing to dedicate time and resources for phones that make up just a small fraction of the overall smartphone market.

However, Chris Weber is hopeful that more developers will come in as Windows 10 apps will have a technology that other mobile operating system does not offer. A universal app technology, which will enable application development firms and indie developers to build apps that work equally well on pocket-sized screens as well as widescreen monitors without any extra programming.

This will drastically increase app development firm's reach, because they will be able to instantly reach to about a billion Windows PC users, in addition to users of Windows Phone powered smartphones.

"It is only possible to meet these million or billion of users with Windows 10 universal app technology, which is not offered by any other ecosystems," said Chris Weber.

If we compare Microsoft's mobile operating system strategy to lure application development firms and indie developers, it is not that different from other operating systems like Mozilla's Firefox OS and Samsung's Tizen operating system. Samsung especially tried to sell lots and lots of low and mid-range smartphones in developing markets in hopes of constructing a healthy market share and luring mobile apps developer companies and indie developers with a lot of users.

To follow that lead, Microsoft unveiled two low-end smartphones, each of them is wrapped with one year free subscription to its products like Office 365, OneDrive and Skype.

According to Chris Weber, these services will differentiate Microsoft from low-end Chinese and Indian smartphones, which sacrifices usability to cut the cost.

Having said that, Chris Weber also acknowledged that Microsoft has still a long way to go and it still faces long odds. "Developing these ecosystems is not an easy game by any means," he said. "It requires gigantic investment and scale around apps and service, it's very difficult to build these ecosystems, whether it's Mozilla or Tizen, and it will be interesting to watch."

John Read is the Author - (Bio) of this post

What Is The Best Xbox 360 Repair Guide?

Fix Your Xbox 360 In One Day With Best Repair Guide

Being worried with regards to xbox repair shop fees can frustrate you but one alternative you might have overlooked is that you can really make the needed repairs yourself. And if you really don't like to wait to get back to gaming you may have to spend more money to just purchase a new xbox system. I think that is a genuinely drastic move particularly in case you are strapped for cash because with an affordable and excellent xbox 360 repair guide you can fix your xbox in under 3 hours.

At the moment that you come to the conclusion that your xbox does have the red light error you may be in search of an "at home" solution, and you have made the correct decision by checking out this article. The purpose of this article is to reveal to you the correct xbox repair guide out there that will give you the complete necessary information that will help you repair your system and that will continue to pay off for a very long time.

During my early days of owning the xbox 360 my very first games console got the 3 red lights and for me the only option was to send it back to the repair shop because i didn't know of any other way. Let me tell you, it was an ordeal that i would not like to repeat reason being that after spending all that money for repairs my xbox got broken again in the mail before i could receive it. I didn't like the fact that even after spending all that money things can still go wrong, and immediately ii began to look for different options to help me repair my xbox 360 by myself.

Before you start to tackle the problem of the red ring of death i would like to make you aware that opening your xbox gaming system on your own voids the warranty. Usually people would be more comfortable to attempt the repairs on their own if their warranty has already expired. I would like to allay your fears that you dont have to be a tech professional, you do not have to be completely good with tech stuff reason being that the correct xbox fix guides are basically straight forward and self explanatory.

The great thing about the Best Xbox 360 Repair Guides is that they are built to be understood by the average person and the content is written in a non technical way so its instructions are really straight-forward.

You can even see the proof on your own at my xbox repair blog where i tested 3 of the leading repair guides obtainable at present on the... (Bio)

Learn To Record Hidden Spy Camera Video Surveillance On Your PC

Normally when you buy a hidden camera there is a small board camera is built into an everyday item like a Air Freshener or CO2 Detector, Alarm Clock.

The spy camera can be wired which means it is connected to the DVR or VCR using a cable. The camera can also be wireless, in this case the camera transmits a signal to a receiver that is connected to the DVR or VCR. There are many hidden cameras that come in all kinds of devices.

But many people want to use their PC to view or record hidden camera video surveillance from their hidden cameras. There are two devices that you can use to view and record all hidden surveillance viewed by your spy camera. This article will describe these two devices.

1) The USB Video Adapter for PC also known as the DVD-Maker, allows you to watch and record live video and audio from any of your hidden surveillance spy cameras on your computer. In addition to this you can grab images plus have video conferencing capabilities all from the comfort of your favorite PC without having to even opening your PC!

DVD-Maker is an external device which connects your VCR, camcorder or video camera to your PC or Laptop. Plug the DVD-Maker into the USB port and you are ready to watch hidden camera video surveillance in a resizable window, right on your PC screen!

DVD-Maker digitizes video using high quality 4:2:2 video sampling. And you can work on applications while simultaneously watching video in a resizable window.

Watch, capture or record live video from your VCR, camcorder or video camera! DVD-Maker connects to any S-Video or composite video source and plugs into your PC or laptop USB port. DVD-Maker video digitizer turns your analog video into digital video, and then sends 30 digital images per second over the USB (1.1 or 2.0) bus.

Spice up your multimedia presentations! Create digital movies in the Microsoft AVI file format with the included video Capture application. The included software allows you to edit and author DVDs, VideoCDs and S-VCDs.

Add video clips to your Web Page: Creative Webmasters can incorporate still frame video highlights or motion video clips on their web sites!

Videoconference* over the Internet: DVD-Maker is a video digitizer and can be used with Internet videoconferencing applications such as Microsofts NetMeeting, CU-SeeMe and more! Videoconference* with your friends an family around the world right from your desktop!

Desktop Publishing: With our exclusive WinTV SnapShot application, you can quickly save video images! Capture 24-bit still video still images in TIFF, JPEG, BMP in color or black/white. Also great for web design.

With the Win USB Video Adapter Installation is a snap! The easiest way to get TV into your PC or laptop! WinTV-USB is an external device with a 125 channel cable-ready TV tuner.

2) Install the WinTV-USB in your PC or laptops USB port and you are ready to watch TV of hidden camera surveillance video in a resizable window, right on your PC screen!

WinTV-USB offers features usually only seen on high-end television sets, like previewing 16 channels at once. And it goes further! Record your TV shows to your PC or laptops disk using MPEG encoding with our SoftPVR. Record video movies from your camcorder or off the air. And with WinTV-SnapShot, snap and print video images from whatever you are watching in high resolution up to 1600 times 1200 pixels!

Make MPEG digital hidden camera surveillance video recordings with our new SoftPVR. SoftPVR uses your PCs processor to digitally record videos to disk, from live TV or from an external video source. Schedule your TV recordings with WinTV Scheduler. Then use your PCs CD burner to create VideoCDs, with up to one hour of video.

Bring live hidden camera surveillance video into your PC or laptop from camcorder, VCR or video camera. With Hauppauges WinTV-Capture, you can record video movies in Microsofts AVI file format for use in web pages or to create your own high-impact multimedia presentations.

Videoconference* over the Internet: Your WinTV-USB is a high performance video digitizer, and can be used with Internet videoconferencing applications like Microsofts NetMeeting, Windows Messenger, CU-SeeMe and more! Videoconference with your friends and family right on your PC!

Spice up your multimedia presentations! With SoftPVR or our WinTV-Capture application, create digital movies in the Microsoft AVI file format or as MPEG movies.

Snap video still pictures: with Hauppauges SnapShot feature, you can capture still hidden camera surveillance video images in adjustable high resolution modes. WinTV-USB digitizes video using high quality 4:2:2 video sampling. And you can work on applications while simultaneously watching TV in a resizable window.

Now you know 2 of the best well known methods and devices to take advantage of recording spy videos on your PC. In a future article I will describe in detail a service that is easy to hook up for a low cost that will allow you to use any of your spy hidden cameras to watch covert surveillance video remotely, anywhere you have an Internet connection.

Glenn Freiboth is an author for Surveillance news and lives in Illinois. Surveillance Equipment products can be found at http://www... (Bio)

What is The Origin Of The Cell Phone?

Fifteen years ago seeing a cellular phone was quite rare, and in today's technologically advanced world, just about everyone has a cellular phone. Adults, teenagers, and even children carry around portable models of the telephone.

Through the interesting history of the cellular phone, one can get the picture of how the portable wonder became what it is today.

In 1843, a skilled, analytical chemist named Michael Farady began exhaustive research to find a space that could conduct electricity. He told of his findings, and these advances of 19th century science and technology have had an incalculable effect on the development of today's cellular phone.

By the year of 1865 a dentist by the name of Dr. Mahlon Loomis became what is thought to be the first person who was able to communicate wirelessly through the atmosphere. Between 1866 and 1873 transmitted telegraphic messages 18 miles between the tops of the Cohocton and Beorse Deer Mountains in Virginia.

Dr. Mahlon Loomis developed a way of transmitting and receiving messages by using Earth's atmosphere as a conductor. He also launched kites enclosed with copper screens that were linked to the ground with copper wires. He was awarded a $50,000 research grant from Congress to continue his studies.

Then, in the year of 1973, a former general manager from the systems division of Motorola, Dr. Martin Cooper, became who is thought to be the inventor of the first portable handset. Dr. Cooper was also the first person to make a call using a portable cell phone.

In New York, he set up a base station with the first working prototype of a cell phone, the Motorola Dyna-Tac. He and Motorola took this technology to New York to show the public.

Later on, in 1977, the cell phone went public and public testing began. Chicago was the home for the first trials with 2,000 people. After Chicago, there were later trials in Washington, D.C. and Baltimore, and then it spread to Japan in 1979.

Usual technologies changed in 1988 when the CTIA - Cellular Technology Industry Association - was formed to lay out realistic goals for cell phone providers. Research for new applications of development was included.

In 1991 the Telecommunications Industry Association set a new standard with the creation of the TDMA Interim Standard 54.

Cell phones have had quite a long journey. Although there was a great demand for cell phones, it took 37 years for them to become commercially available in the United States.

Wireless service was actually invented almost 50 years ago, so it's hard to believe that cell phones have only become popular over the past couple of decades. Currently, there are more than 60 million people who own cell phones.

Read more from Joe Goertz at: technology-mag.com (Bio)

Do You Know, What Does 3G Mean?

Nowadays, everybody has a mobile phone. Whether they're on a contract or a pay as you go tariff, the mobile phone has become an essential item for many people. this article will be taking a look at the the mobile phone's history - as well as its future - in order to find out more about the now essential telecommunications device.

Mobile phones started life as the two way radio, which was also called mobile rigs. these were installed in vehicles such as minicabs, police cars and ambulances, but were not strictly mobile phones as they were not normally connected to the telephone network. while the very first mobile phones were installed permanently in vehicles, later versions such as the transportables, also called bag phones, could also be carried, and can be used as either portable or as mobile two-way radios.

The first generation of mobile phones are often called 1G. These mobile phones are the analog devices that were introduced in the eighties & continued until being replaced by 2G mobile phones, which ran on digital networks. in fact, even though 1G & 2G systems use digital signals to connect the radio towers to the rest of the telephone network, the voice itself during a phone call encoded to digital signals in 2g while voices on 1G phones aren't.

Second generation, also called 2-g, mobile telephones were introduced in the nineties. 2-g phone systems were characterised by their use of digital transmission and the introduction of advanced and fast phone to network signalling.

The birth of 2-g systems saw telephones move from friendly 1g telephones to little handheld items, which were much more portable. this change was possible through technological developments including more advanced batteries and energy saving electronics.

The second generation mobile telephones had severaladvantages over 1g items. These included text messaging, which became possible on gsm networks initially and eventually on all digital networks. the earliest machine-sent message was sent in 1991 in the uk. the earliest person to person sms text message was sent in 1993 in finland. sms text messaging soon became the preferred method of communication and the public now prefer sending text messages to placing voice calls.

3-g is the term applied to the third generation of mobile phone standards & technology. 3g follows 2g mobile phone technology.

The birth of 3-g technologies allow network operators for instance Vodafone give their users a larger range of more advanced services. These include video calls& wireless internet.

Even though 3-g was successfully introduced throughout the world, issues have been raised by both 3-g providers & users, comprising of costly phones. in addition to this, there's numerous differences in the licensing terms.

Ever since the launch of 3-g mobile phone technology. people have been talking about 4g. 4g technology will signify the future of mobile telephones, creating the most sophisticated handsets and best services yet. in actual fact, one of the next services to be developed is thought to be live streaming of radio and tv shows to 3-g handsets is and shops including real and disney recently announcing that they'll be offering services like these.

In conclusion, even though the history of mobile phones they have come a long way in the past few years, it also indicates that they'll go even further still.


Maria Literral has worked in telecoms for over 20 years having spent time developing mobile communications and wireless telecommuncation... (Author - Bio)

How Search Tools Works?

How Search Tools Works?

Explanation is here bellow ....!!

The Web can be incredible resource, providing information on nearly any topic imaginable. Are you planning a trip? Writing an economics paper? Looking for a movie review? Trying to locate a long-lost friend? Information sources related to these questions, and much, much more, are available on the web. With over 20 Billions pages and more being added daily, the web is a massive collection of interrelated pages. With so much available information, locating the precise information you need can be difficult. Fortunately, a number of organizations called search services operate Web sites that can help you locate information you need. They maintain huge databases relating to information provided on the web and the Internet.

The information stored at these databases includes addresses, content descriptions or classifications, and keywords appearing on Web pages and other Internet Informational resources. Special Programs called Spiders continually look for new information and update the search services’ databases. Additionally, search services provide special programs called search engines that you can use to locate specific information on the web.

Do You Know The Concept of Instant Messaging (IM)?

Do You Know The Concept of Instant Messaging (IM)? If You Want to know so see the following Information......!!

Instant messaging (IM) allows two or more people to contact each other via direct, live communication. To use instant messaging, you register with an instant messaging server and then specify a list of Friends. Whenever you connect to the Internet, special software informs your messaging server that you are online. In response, the server will notify you if any of your friends are online. At the same time, it notifies your friends that your friends are online. You can then send messages directly back and forth to one another. Most instant messaging programs also include video conferencing features, file sharing, and remote assistance. Many businesses routinely use these instant messaging features.


The Most widely used instant messaging services are Rediff BOL Instant Messenger, Microsoft’s MSN Messenger, one limitation, however, is that many instant messaging services do not support communication with other services. For example, at the time of this writing,  a user registered with yahoo cannot use yahoo’s instant messenger to communicate with a user registered with Rediff BOL. Recently, however, some software companies have started providing universal instant messenger programs that overcome this limitation. For example, Gain Odigo, and Trillian provide instant messaging services that do
support communication with other services.

Similarity Of The Internet and the Telephone System

The Internet and the telephone system are similar-you can connect a computer to the Internet much like you connect a phone to the telephone system. Once you are on the internet, your computer becomes an extension of what seems like a giant computer-a computer that branch all over the world. When provided with a connection to the Internet, you can use a browser program to search Web.

PROVIDERS

The most common way to access the Internet is through an Internet service provider (ISP). The providers are already connected to the Internet and provide a path or connection for individuals to access the Internet. Your college or university most likely provides you with free access to the Internet either through its local area networks or through a dial-up or telephone connection. There are also some companies that offer free Internet access.

  The most widely used commercial Internet service providers are national and
wireless providers.

•    National service providers like BSNL (Bharat Sanchar Nigam Limited), VSNL (Videsh Sanchar Nigam Limited) are the widely used. They provide access through standard telephone or cable connections. Users can access the Internet from almost anywhere within the country for a standard fee without incurring long-distance telephone charges.

•    Wireless service providers offer Internet connections for computers with wireless modems and a wide array of wireless devices. As we will discuss In Chapter 9, users connect to ISPs using one of a variety of connection technologies including DSL, cable, and wireless modems.