| Radio remote controls use radio waves to send | | | | works on different bands of frequency. |
| commands to different devices. These are | | | | For example, alarm and security systems work at 40 |
| electromagnetic waves of varying frequencies, | | | | megahertz, mobile phones between 824 to 849 |
| emitted through antennas and picked up by radio | | | | megahertz and an air traffic radar at anywhere |
| receivers. | | | | between 960 to 1,215 megahertz. Now the question |
| Therefore, when you press a button on your radio | | | | arises that, if there are so many frequencies traveling |
| remote, it sends radio waves to your music system, | | | | in the air at the same time, how do gadgets know |
| which decodes the signal and obeys your command. | | | | which ones to receive and which to ignore? When |
| An amazing aspect of radio remotes is that they can | | | | advanced radio remotes send radio waves, their |
| send signals from greater distances, since radio | | | | unique digital address is also sent embedded in the |
| waves travel as long as 100 feet to reach the | | | | waves, which the target receiver recognizes and |
| receiver. They can even penetrate walls, and | | | | accepts. This smart technology is already being used |
| therefore an increasing number of modern appliances | | | | in cellular phones, Wireless Fidelity (WiFi) environments |
| are now being designed with radio remotes. | | | | and cordless phones. |
| Bluetooth technology also uses the principle of radio | | | | In the future, as our need to remotely control |
| frequencies. For example, Bluetooth technology can | | | | multiple appliances increases, radio remotes will be |
| interconnect your home theater system, mobile | | | | seen playing greater roles. Tasks in risky |
| phone, music system, computer and television by | | | | environments, such as space and military scenarios, |
| using radio frequencies to send signals between them. | | | | can be performed through remote control. Devices |
| It creates a wireless community of your gadgets | | | | and remotes will become more intelligent as radio |
| that literally speak to each other. Every appliance | | | | remote control technology develops. |