What is SW in radio

It’s called shortwave because, quite literally, the waves emitted are short as opposed to long wave and medium wave, used by AM radio , and wideband VHF (very high frequency) used by FM radio. These short waves can travel thousands of miles across the globe, so shortwave radio is, by nature, international.

Shortwave radio is radio transmission using shortwave (SW) radio frequencies. There is no official definition of the band, but the range always includes all of the high frequency band (HF), which extends from 3 to 30 MHz (100 to 10 metres); above the medium frequency band (MF), to the bottom of the VHF band.

And most shortwave (SW) broadcasting is still AM . AM radio is talk radio, that is, news, weather, traffic, sports and opinion. There are still some AM music stations around but mostly the music moved to FM.