 of the amateur services differs from that of other kind of mobile station, but other allocations have been made speci- services in that the licence is awarded, not to the station, but to the 26/12 Radio spectrum management TERRESTRIAL STATION SATELLITE TERRESTRIAL STATION ANGLE OF ELEVATION OF INTERFERENCE Figure 26.7 Geometry of interference from satellite transmitter to terrestrial service receiving station, showing angle of elevation 8 of interference on arrival operator, subject to proof of competence to operate a station. Formal areas. There are extensive broadcasting allocations world wide assignments are made to amateur satellites and notified to the IFRB. between 4MHz and 26MHz. Almost all of these allocations are Specific frequency assignments are not made to other amateur exclusive to broadcasting and there are internationally agreed fre- stations. quency assignment plans for the bands below 1700kHz. There are broadcasting allocations around 60, 100, 200 and 500 to 26.4.5 The inter-satellite service 900MHz, used for television and FM sound radio. The broadcasting service has primary status throughout but there is extensive sharing Some research services have frequency allocations for satellite to with the fixed and the mobile services. However, access to spectrum satellite links but the other satellite using services, which may find for these sharing services differs considerably from place to place. need for inter satellite links in the future, have no suitable spectrum In Region 1 international frequency assignment plans have been allocated for them. Instead, frequency bands have been allocated for agreed for broadcasting in all these bands and broadcasting use is the inter satellite service and frequencies in these bands may be intensive; substantial use is made of the mobile service allocations assigned for any inter satellite links, regardless of the service to for land mobile systems, but only where this has been harmonised which the satellites belong. with the superior claim of the planned broad