oming into use. Millimetre transmission must be stopped immediately. wave assignments are quite suitable for some kinds of radio system, Put briefly, governments do not bind themselves to implement the such as short distance wide band fixed links, and they are acceptable table, but they undertake to respect the right of other governments for many other purposes, but they are unsuitable for, for example, to do SO. most land mobile applications. Where a band is allocated internationally for several sharing The emergence, in the 1980s, of technical means for providing services, it will often be desirable for an administration to limit the convenient mobile radiotelephone facilities, car borne and hand use of the band, or part of it, within its jurisdiction to some or only portable, at an acceptable price has led to a massive demand for land one of those services. For example, much of the spectrum between mobile systems, cellular and trunked, and consequent pressure for 47MHz and 960MHz is allocated internationally to both the broad- spectrum below 1GHz. To clear spectrum for these mobile systems, casting and the mobile services; in practice, within a given wide it has been necessary to replace many assignments for fixed links area, a given block of spectrum can be used for only one of these below 1GHz by new assignments at higher frequencies and a critical examination has been made of the need for some of the VHF and services. Likewise it is unsatisfactory for the same radio channel to be used by both aircraft and surface vehicles. Each country must UHF allocations for broadcasting. The next major stage in the decide for itself how to divide these bands between the various expansion of mobile radio is involving the use of frequencies around 2GHz. potential users, although these national decisions will often be harmonised with those of neighbouring countries. If provision cannot be made for a new allocation in a national table An administration constructs a national frequency allocation from amongst the options provi