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Without radio technology there are a number of household gadgets that simply would not be with us today, including microwave ovens, cordless telephones, remote controls, wireless Internet, and baby monitors. Initially radio waves were only used to transmit conversations, however it seems that nowadays they can be used to send a variety of data including pictures and videos. Radio frequencies cover all waves below visible light and are defined as the transmission of signals through a space by modulation of electromagnetic waves. Because electromagnetic waves are essentially sound they travel in oscillating fields - the phase width, the frequency and the amplitude are all altered to transmit information which is then received by a conductor that transforms the signal into sound or other forms of information using an alternating current. Such technology as this is found in many household appliances including cordless telephones, where radio waves are used to transmit data between the hand set and the base. This useful development of the traditional house phone was invented by a jazz singer by the name of Teri Pall in 1965, and is now found in houses all around the world. Initially the cordless phone could only operate on low frequencies and in a small area, this meant that they were subject to interference and lacked security. Nowadays cordless telephones can operate on higher frequencies and across larger areas so these issues are not so relevant. With the introduction of smart phones it has become quite common for establishments such as cafes and bars to have Wi-Fi connections. These use radio waves to allow the user to log onto the Internet without any need for a wire. Many households make use of Wi-Fi as well, and most modern routers have wireless capabilities allowing desktops, laptops, MP3 players, and smart phones to all get online wirelessly. The Internet itself has brought new potential to communications technology, allowing users to make free video calls around the world. VoIP phone lines, meanwhile, remove the hassle of having to log into your computer every time. One of the initial uses for radio waves was for walkie-talkies; radios were and still are used by emergency services and other similar organisations. This technology is used in similar ways around the home; probably the best example is baby monitors, though similar this does actually uses slightly different technology with added security. Walkie-talkies operate on a half duplex channel meaning they can pick up numerous signals, in case someone is trying to reach them. Baby monitors however use high frequencies and scrambling technology to reduce interference. For deals on BT baby monitors or corded telephones why try looking online.
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