LW - longwave refers to parts of the radio spectrum with relatively long waveslengh, it was used during the 1940's.
MW - Medium wave is the part of the medium frequency radio band used mainly for AM radio broadcasting.
AM - The electrical image of the sound (taken from a micopone or other program source) is used to modulate the amplitude of the carrier wave transmitted from the broadcast antenna of the radio station, this happens when information is broadcasted from an AM radio station. This is different to FM radio where the signal is used to modulate the frequency of the carrier.
FM - Whereas AM radio provides low - fidelity, FM radio provides high - fidelity. When information is broadcast from an FM radio station, the electrical image of the sound (taken from a microphone or other program source) is used to modulate the frequency of the carrier wave transmitted from the broadcast antenna of the radio station.
DAB - This stands or Digital Audio Broadcasting, it is used in quite a few countries but mostly in Europe. this is a way of broadcasting radio digitally via a network of transmitters. It provides listeners with more choice, better sound quality and more information. With DAB radio, it is also possilble to pause and remind live radio.