Radio is a tried-and-true method of sending data far and wide. Whether it is used for critical emergencies, business activity or lighthearted entertainment, radio has become an essential aspect of modern living.
A device can use both a transmitter and a receiver for audio. Phones, airbands and many radio sets like the uniden bearcat, have this function, which is called two-way radio. One-way radio is a unidirectional transmission, which comes from devices such as wireless microphones and baby monitors. In a computer network, devices can exchange data such as phone calls, video, text messages, audio and web content. This communication is usually fast and broad.
Sometimes information is sent to multiple receivers with the intention of reaching a public audience. Broadcasting stations are set up to disseminate signals within a localized distance, and satellites are often used for wider regions. Governments and businesses can pay for traditional television and radio systems to get messages across. Many satellite systems are subscription-based, where the customer pays by the month or year.
Tracking and mapping are essential for many professions. Missiles, aircraft, ships and weather patterns are located and monitored by radar sets. Radio waves are sent around a designated area through a beam. Once the target is hit, the receiver is notified. RF splitters and couplers can be used to measure the time delay between transmission and reception, which determines how close the target is. Radars are often used in endeavors such as space exploration and military operations.
Radio Remote Control
Radio waves can control devices by transmitting signals. The devices can sometimes send real-time data back to the station so the controller is aware of their location and condition. An example of radio remote control is when a satellite ground station sends commands to unmanned aircraft and spacecraft. Most handheld devices that control video players and televisions do not use radio remote control, as these devices usually rely on infrared light instead of radio waves.
Governments sometimes use radio signals to throw off other signals. This process, called radio jamming, is commonly used for military war tactics. Some countries also use jamming so that their citizens don’t have access to foreign signals. A strong transmitter is usually used to produce frequencies that are equal to those of the target.
As technology continues to evolve, radio has become the basis of many fields. Technicians are finding more and more ways to generate and manipulate radio waves for new achievements.