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Digital Audio Broadcasting
Videos
Digital Audio Broadcasting is a digital radio standard for broadcasting digital audio radio services in many countries around the world, defined, supported, marketed and promoted by the WorldDAB organ
A Pure DAB receiver
A Pure DAB receiver
Prototype DAB receiver (1993)
Prototype DAB receiver (1993)
A Pioneer car DAB tuner from 1998. This box connects to its head unit on the car dashboard as well as an external aerial.
A Pioneer car DAB tuner from 1998. This box connects to its head unit on the car dashboard as well as an external aerial.
A modern large tabletop DAB receiver with colour screen
A modern large tabletop DAB receiver with colour screen
FM broadcasting
Videos
FM broadcasting is a radio broadcasting method that uses frequency modulation transmissions. In November 1919, Hans Idzerda began broadcasts, using narrow-band FM, over station PCGG, located at The Ha
Digital Audio Broadcasting
…publicly released in 1995, with consumer-grade DAB receivers appearing around the late 1990s. Initially it was expected in many countries that existing FM services would switch over to DAB, although the take-up of DAB has been much slower than expected. In 2017, Norway became the first country to have…
A commercial 35 kW FM radio transmitter built in the late 1980s. It belongs to FM radio station KWNR, in Henderson, Nevada, and broadcasts on 95.5 MHz
A commercial 35 kW FM radio transmitter built in the late 1980s. It belongs to FM radio station KWNR, in Henderson, Nevada, and broadcasts on 95.5 MHz.
FM has better rejection of static (RFI) than AM. This was shown in a dramatic demonstration by General Electric at its New York lab in 1940. The radio
FM has better rejection of static (RFI) than AM. This was shown in a dramatic demonstration by General Electric at its New York lab in 1940. The radio had both AM and FM receivers. With a million-volt arc as a source of interference, the AM receiver produced a roar of static, while the FM receiver clearly reproduced a music program from Armstrong's experimental FM transmitter in New Jersey.
Crossed-dipole antenna array of station KENZ's 94.9 MHz, 48 kW transmitter on Lake Mountain, Utah. It radiates circularly polarized radio waves.
Crossed-dipole antenna array of station KENZ's 94.9 MHz, 48 kW transmitter on Lake Mountain, Utah. It radiates circularly polarized radio waves.
Armstrong's first prototype FM broadcast transmitter, located in the Empire State Building, New York City, which he used for secret tests of his syste
Armstrong's first prototype FM broadcast transmitter, located in the Empire State Building, New York City, which he used for secret tests of his system between 1934 and 1935. Licensed as experimental station W2XDG, it transmitted on 41 MHz at a power of 2 kW.