The shortwave (SW) frequency range is between 3 MHz and 30 MHz, and its wavelengths between 10 m and 100 m are subdivided into various shortwave bands. These shortwave bands are designated as meter bands and are assigned to the corresponding frequency bands.
Shortwave is also a broadcasting technical term for broadcasting in the frequency range between 2.3 MHz and 26.1 MHz. For reasons of frequency economy, shortwave broadcasting uses extremely narrowband voice transmission with single-sideband modulation. The typical modulation code is H3F.ionosphere and can even be earth-orbiting.
Since the transmission quality of shortwave is extremely poor, a digital alternative has been developed in the form of DRM radio, with which transmission rates of up to 24 kbit/s can be realised in the available channel widths and which is characterised by high transmission quality.