Radio
Radio is the radiation (wireless transmission) of electromagnetic energy through space. The biggest use of radio waves is to carry information, such as sound, by systematically changing (modulating) some property of the radiated waves, such as their amplitude, frequency, phase or pulse width.
hen radio waves strike an electrical conductor, the oscillating fields induce an alternating current in the conductor. The information in the waves can then be extracted and transformed back into its original form.
Cardboard radio
This is a Science Museum battery powered FM radio and MP3 speaker with recycled cardboard exterior.
FM broadcasting is a VHF broadcasting technology, pioneered by Edwin Howard Armstrong (American electrical engineer and inventor), which uses frequency modulation (FM) to provide high-fidelity sound over broadcast radio.
In the United Kingdom, the BBC began FM broadcasting in 1955, with three national networks hosted by popular DJs (disk jockeys), including the Light Programme, Third Programme and Home Service.
We’re upgrading our systems, and this includes changes to our customer and member account log in, MyIET. It’s part of our big picture plan to deliver a great experience for you and our wider engineering community.
Whilst most of our websites remain available for browsing, it will not be possible to log in to purchase products or access services from Thursday, 17 April to Wednesday, 30 April 2025. Our Member Relations team is here to help and for many of our services, including processing payments or orders, we’ll be able to support you over the phone on +44 (0)1438 765678 or email via membership@theiet.org.
We apologise for any inconvenience this may cause and thank you for your understanding.
For further information related to specific products and services, please visit our FAQs webpage.