Radio Broadcast Technology

- radio broadcast technology and radio broadcasting including analogue radio digital radio, analogue television and the many forms of digital television for terrestrial television, satellite television and mobile or handheld television.

Radio broadcasting is an established use of radio technology. The first organised broadcasts taking place in the 1920s. Now there are many radio stations broadcasting all over the world using a variety of differernt types of transmission. Today, radio broadcast equipment from transmitters and receivers to antennas, studios and relay links are widely available, although with the new standards for transmission including DAB Digital Radio and DRM, new equipment is required. Nevertheless AM as well as FM with its RDS capability are still the most widely used.

AM broadcasting
C-QUAM system for broadcasting AM stereo

VHF FM broadcasting
VHF FM is the most widely used form of broadcasting in areas of the world where the population is relatively high. Its bandwidth enables it to carry high quality transmissions, stereo, and other services such as RDS.
Broadcast VHF FM
RDS - Radio Data Service

Digital Audio Broadcasting (DAB)
DAB digital radio is now widely deployed in many countries around the globe, and now that the cost of radios has fallen, listener figures are rising. Although not available in many countries, it is certainly making a significant impact where it has been deployed, adding more flexibility and the possibility of near CD quality.
DAB digital radio
DAB digital radio Band III channel numbers and frequencies
HD Radio - the new digital radio system for the USA

Digital Radio Mondiale
While DAB digital radio is focussed at bands at VHF and above there have been developments for the lower frequencies. Digital Radio Mondiale (DRM) is now being deployed and is a replacement for the amplitude modulation (AM) transmissions that have been on the airwaves for over 100 years. The new technology has now been extended for use up to 100 MHz and with many developments under way radios should soon be available.
Digital Radio Mondiale (DRM) - the new standard to replace AM broadcasting

Television
There are many way in which television can be distributed these days. From the old analogue television radio broadcasts, through the new digital methods of radio delivery to IP based delivery over wired networks such as the Internet.
What is DVB - Digital Video Broadcasting - an overview or tutorial about the basics of DVB
IPTV - Internet Protocol Television