Wireless+Communication+RW

1. Who invented wireless communication? When?

It was Jagdish Chandra Bose, who developed the early wireless detection device and branded the spectrum for the knowledge of the wireless communication and the electromagnetic waves. Later on practical uses were found by inventors such as Nikola Tesla for making the wireless radio communication and radio remote control technology.

. 2. What is different about walkie talkies and cell phones?

A walkie-talkie send a signal directly to its twin. While a cell phone send signals to the nearest cell phone tower, which is then sent to the cell phone's service provider. If the intended recipient has the same service provider, or if it's intend for a recipient that has a different wireless service provider or a normal phone it's sent to the public telephone network.

3. Why are they called "cell" phones?

A cell phone recieved its name due to a cell phone's service provider dividing service areas into groups that are called cells.

4. How do the phones use the "cells" to send and receive messages?

A cell phone sends out a transmission that the tower is also operating at and these signals get transfered to the other cell phone or land line by the carrier.

A cell phone is a duplex device, so it uses one frequency for talking and a second, separate frequency for listening. A CB radio has 40 channels. A cell phone can communicate on 1,664 channels. Cell phones also operate within cells and they can switch cells as they move around. Cells give cell phones incredible range, a walkie-talkie can transmit perhaps a mile. A CB radio, because it has much higher power, can transmit perhaps 5 miles. Someone using a cell phone, on the other hand, can drive clear across a city and maintain a conversation the entire time. Cells are what give a cell phone its incredible range.