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If anybody really needs mobile broadband, it´s the emergency services. But upgrading the tried-and-trusted TETRA radio system raises guestions about spectrum allocation. TETRA, or Terrestrial Trunked Radio, has for many years offered a resilient and secure digital radio for voice communications and short messaging. Europe´s emergency services have found it well suited to their work: if you cut the wiring to a TETRA basestation, local handsets can still communicate with each other directly; if you blow up a TETRA exchange, there will be another one on standby to take its place.