Cordless Phone

Cordless Phones

Cordless telephones are one of those minor miracles of modern life -- with a cordless phone, you can talk on the phone while moving freely about your house or in your yard. Long before cell phones became so cheap that anyone could afford one, cordless phones gave everyone the freedom to walk and talk within the privacy of their own homes.

A cordless telephone is basically a combination telephone and radio transmitter/receiver (see How Telephones Work and How Radio Works for details on these two technologies). A cordless phone has two major parts: base and handset.

·         The base is attached to the phone jack through a standard phone wire connection, and as far as the phone system is concerned it looks just like a normal phone. The base receives the incoming call (as an electrical signal) through the phone line, converts it to an FM radio signal and then broadcasts that signal.

·         The handset receives the radio signal from the base, converts it to an electrical signal and sends that signal to the speaker, where it is converted into the sound you hear. When you talk, the handset broadcasts your voice through a second FM radio signal back to the base. The base receives your voice signal, converts it to an electrical signal and sends that signal through the phone line to the other party.

The base and handset operate on a frequency pair that allows you to talk and listen at the same time, called duplex frequency.

Components:-

·         speaker - converts electrical signals into the sound that you hear

·         microphone - picks up your voice and changes it to electrical signals

·         keypad - input for dialing

·         buzzer or ringer - lets you know that you have an incoming call
·       radio components  - amplify electrical signals to and from microphone and speakers and send and receive FM radio frequencies

·         LCD or LED displays - indicator lights

·         re-chargeable battery - supplies electrical power to handset

    Problems:-

• Battery           
• Range
• sound quality                             
• Security

How to install cordless phones:-