NT1310
July 24, 2013 A cell phone is a two-way radio that sends and receives radio signals to and from cell site base stations. When a person talks on a cellular phone, the voice message gets converted into radio waves. The radio waves travel through air until they reach a base station close by. The base station sends the call across the communication network after which the call reaches the intended receive
Landline telephones use voice transmission where the transmitter and receiver are located in the handset. Powered by the line, the microphone produces an electrical current which varies its frequency and amplitude in response to the sound waves arriving at its diaphragm. The resulting current