Analog Telephone
Jun 03
2010
2010
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Analog Telephone
What Are Cordless Telephone Frequencies and How They Work?
Today, almost everyone has a mobile phone or cell phone. Mobile communication is everywhere around these days and it is almost impossible to spend a day without talking to someone on the phone. If you are a busy professional or traveling to various places in a single day, you will be spending a lot of time speaking on the phone. It becomes so essential for you that you cannot do without it. You might have wondered how cordless telephones work. They operate through various frequencies which have been specifically allotted to them.
How do cordless telephones work? When you use your cordless telephone, you are able to communicate with others because of the allotted frequencies. The earliest frequency used was the 1.7 MHz and this was allotted to the very first analog telephones. These analog phones, however, are no longer in production and now not used by anyone. Furthermore, they are susceptible to eavesdropping and interference.
Frequencies between 46MHz and 47MHz (essentially a set of 25 frequencies) were used by analog cordless phones, low-powered walkie talkies and baby monitors. This band however, soon became crowded and the initial set of 10 frequencies were expanded to another 15, making a whole set of twenty five frequencies. The models that used these frequencies are no longer in production as their frequencies could be heard on a radio scanner.
Those frequencies that lie between 902 MHz and 928 MHz are used by new cordless telephone models and this band is not as crowded as the 46MHz to 47MHz. The cordless phones that make use of the 900 MHz frequencies come with short antennas and they are not so susceptible to interference. These phones are available in analog, digital and analog-digital spectrum varieties. The 2.7GHz model is used by the latest cordless telephones. Latest cordless telephone models make use of the 5.8 GHz frequency.
About the Author
Dennis enjoys writing on wide range of topics such as cordless telephone frequencies and cordless telephone. You may visit for more details.
Using Frequency division Multiplexing, how many analog ?
Using Frequency division Multiplexing, how many analog telephone channels will fit in the portion of the radio spectrum between 90 MHz and 100 MHz? Explain calculations
That depends on what bandwidth your country allows for telephone.
If you allow 3 kHz, no guardband, then 100 M - 90 M = 10 M.
10 M / 3 k = 10 000 / 3 = 3 333 channels.
Anycool V868 Quad Band Analogue TV Phone with Rotatable Cover and 1.3 MP Camera
