DMR is just one of the digital modes in use around the world.It’s a rival to Icom’s D-STAR and Yaesu’s System Fusion – and is actually a commercial system adopted by us Hams.The allocation of sub-bands enables the indicated category of users to employ any frequency within that sub-band provided that no appreciable energy falls outside that sub-band.
The ‘Usage’ column indicates the main usage of a sub-band or segment.
It contains meeting/calling frequencies agreed upon for the convenience of the VHF.
The 144MHz UK band plan is based on the International Amateur Radio Union (IARU) Region-1 band plan.
The plan shows the frequency limits of individual ‘sub-bands’ or segments.
Icom were keen to see D-STAR take off so practically threw repeater systems at groups willing to host one.