VHF in Porthcawl

 

When I was a child, I was familiar with the letters VHF. Very High Frequency was what the better signal that Radio 1 shared with Radio 2 was called. It is now called FM. VHF and FM refer to different properties. FM is how the wave is changed to carry the coding for the sound. With Frequency Modulation (FM) it is the frequency that is varied slightly to encode the programme. This is a more accurate description of that radio than VHF, which just refers to a band of EM waves from 30 to 300MHz. Now channel 16 is the international distress channel (see this). It turns out that marine radio is FM. There is Amplitude Modulation (AM) VHF but that is for aviation.