When you dial a number in your conventional telephone, each dial produces a corresponding electrical impulse which gets transmitted to your receiver set through the piece of cable (wire) connecting the handset and the receiver set. The receiver set then transmits the signal to the desired destination through the telephone cables, being processed on its way by your telephone exchange and the exchange at the receivers end.
                             In a cordless telephone the only difference is that there is no cable connection between you handset and the receiver set. Here the handset produces electromagnetic waves of particular frequencies as per your dial and the receiver picks up these waves, converts them electrical signals and then, following the same means as that of the conventional telephones, transmits them to the desired destination. The process is reversed in the case of receiving a call except that the handset, after receiving the electromagnetic signals from the receiver, converts them into corresponding sound or voice.
                              With a cordless telephone you need not go to your receiver set to make or to receive a call. You just keep the handset with you wherever you are and thus save your labour and time. However, in the absence of an elaborate arrangement the electromagnetic waves produced or received are not very strong and so, there is a limitation on the distance you can be away from your receiver set. The range varies depending on your particular cordless set, the normal range being around fifty metres.

A Cordless Phone


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