History of Cordless Phones

!±8± History of Cordless Phones

Phones have been the center point of means of communication for many years. Phone was invented by Alexander Graham Bell after a lot of trial and error in 1870. Invention of the phone, as it is called today, began with transmitting speech electrically. Telegraph and telephone are both wire based electronic systems. Telephone was a result of efforts by Mr. Bell to perfect the telegraph. This was in great demand as vocal communication was possible between two individuals. It was an unheard phenomenon and people criticized it as much as they accepted it.

Phones were a large and stationary piece of equipment and were able to communicate only between specified groups of individuals. Since then, phones have been improvised upon and made to look attractive, sleek and are a handy device. Engineers made use of lighter and durable materials in an endeavor to make phones portable and efficient. By 1950s, phones had become quite efficient and were not so cumbersome any more.

A lady named Teri Pall invented the cordless phone in 1965. She was a jazz singer by profession and came up with an idea to eliminate the wiring and make the handset wire free. Such a cordless phone functioned at a low frequency of 47-49 MHz and worked well only in small areas. Advanced versions of higher frequency cordless phones are capable of functioning flawlessly in large spaces. Efficiency of high frequency phones is superior to that of low frequency phones with better security as it became difficult to interfere into calls.

Federal Communications Commission or the FCC granted permission to companies to manufacture 900 MHZ frequency phones only by 1994. This move by the government triggered an upsurge in the demand for cordless phones. Frequency of 900 Mhz was ideal to scrap out static caused by walls, appliances and interference in signals by other objects. They provided high quality sound output but were still prone to eavesdropping. In order to tighten security, FCC allowed manufacturers to make phones with frequencies of 2.4 GHZ and 5.8 GHZ.

These are secured cordless phones and cannot be interrupted by any radio scanner. High end cordless phones evolved primarily keeping in mind the confidentiality of conversations.

History of Cordless Phones

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Sony BabyCall Monitor Vs Philips Avent Basic Baby Monitor - A Review

!±8± Sony BabyCall Monitor Vs Philips Avent Basic Baby Monitor - A Review

Sony BabyCall Monitor

The Sony BabyCall Monitor is perfect for the mommy or daddy that lives in a large house. The monitor has an extended range, which means you can take the receiver farther from the baby and still use it.

You'll also appreciate having 27 channels because they minimize interference from other wireless items. This feature comes in handy if you have wireless items in your home, such as a router. On top of that, the channel selector helps you find the clearest channel of the 27 available.

The monitor also features an out of range indicator. You'll never have to worry that you're too far away from the baby for the monitor to work. The unit simply plugs into a standard outlet in your home or you can use the rechargeable batteries supplies with the item.

Philips Avent Basic Baby Monitor

You're not chained to the nursery when you use the Philips Avent Basic Baby Monitor. The monitor has a generous operating range, which makes it easy to use in multiple rooms of the house. Some monitors force you to stay close to the receiver, but this one monitor gives you a certain amount of freedom.

You'll also appreciate the talk back feature, which allows you to communicate with your precious baby even if you're in a different room. Other benefits include zero interference with other wireless devices, and data encryption that keeps your connection private and secure.

The adjustable volume allows you to hear everything happening in your baby's room. Turn the sound up to hear your baby over the lawn mower, vacuum or washing machine. Turn the sound down during times of quiet. The monitor is a cordless unit that's light enough to clip on your shirt or pants. You can easily take it into any room, and remain contact with your little one.

You simply have to decide which monitor is the best for your situation. No matter which monitor you choose, make sure to practice safety. Keep the power cords away from your baby.

Sony BabyCall Monitor Vs Philips Avent Basic Baby Monitor - A Review

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Astak 2.4 GHz Pan & Tilt Baby Camera with 2.5" LCD Color Handheld Monitor with Night Vision

!±8±Astak 2.4 GHz Pan & Tilt Baby Camera with 2.5" LCD Color Handheld Monitor with Night Vision

Brand : Team Research Inc.
Rate :
Price : $139.00
Post Date : Dec 02, 2011 22:48:36
Usually ships in 24 hours

Do you want a baby video camera system that installs in a few minutes and transmits up to 300' away? The ASTAK CM-860Q 2.4GHz Wireless Pan and Tilt night vision color security camera with 2.5" LCD handheld monitor set does this and a lot more. Included in the package are one pan and tilt night vision remote control camera and one multi-channel receiver with 2.5" LCD monitor. You can watch the live video on handheld monitor or on any TV set. You can also record the video directly to your VCR or DVR. The camera delivers 380 TV lines high-resolution video images. Best part: no drilling through walls or wiring anywhere? be a Pro in minutes.

Features:

•Built-in microphone and channel switch
•Pan and Tilt night vision wireless color security camera with 2.5" LCD handheld monitor set; night vision (with 9 IR LEDs, night vision range: 25')
•Remote controlled by handheld monitor
•Wireless receiver supports up to 3 cameras
•Just connect to your TV or VCR

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