ITU member countries will approve a recommendation and change two...
ITU member countries will approve a recommendation and change two others dealing with mobile, radiodetermination, amateur and related satellite services, unless objections arise by June 6. The new recommendation would set standards, discusses the effects of interference and develops…
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interference protection criteria, said a letter circulated Friday by the Radiocommunication Bureau. A revision added four new orbital locations for protection from the emissions of fixed service systems operating in the 2.025-2.110 GHz and 2.2-2.29 GHz bands, according to the letter. The new orbital locations are: 89 degrees E, 133 degrees E, 12 degrees W, and 79 degrees W. And descriptions of multicarrier systems to provide a wideband service were added to characteristics of VHF radio systems and equipment for the exchange of data and e-mail in the maritime mobile service in certain channels. Ten recommendations on frequency sharing and coordination between fixed-satellite and fixed service systems will be withdrawn, according to the letter: (1) Frequency sharing between systems in the fixed-satellite service and radio-relay systems in the same frequency bands. (2) Maximum allowed values of power flux-density at the surface of the Earth produced by satellites in the fixed- satellite service using the same frequency bands above 1 GHz as line-of-sight radio-relay systems. (3) Maximum equivalent isotropically radiated power of radio-relay system transmitters operating in the frequency bands shared with the fixed-satellite service. (4) Maximum allowed values of interference from terrestrial radio links to systems in the fixed-satellite service employing 8-bit PCM encoded telephony and sharing the same frequency bands. (5) Calculation of the maximum power density (averaged over 4 kHz) of an angle- modulated carrier. (6) Maximum equivalent isotropically radiated power transmitted towards the horizon by earth stations of the fixed-satellite service sharing frequency bands with the fixed service. (7) Sharing between the fixed service and the fixed-satellite service with bidirectional usage in bands above 10 GHz currently unidirectionally allocated. (8) Possible use by space stations in the fixed- satellite service of orbits slightly inclined with respect to the geostationary-satellite orbit in bands shared with the fixed service. (9) Carrier-to-interference calculations between earth stations in the fixed-satellite service and radio-relay systems. (10) Maximum allowed values of power flux-density at the surface of the Earth produced by non- geostationary satellites in the fixed-satellite service used in feeder links for the mobile-satellite service and sharing the same frequency bands with radio-relay systems.