ITU-R REPORT BO.809-3 [ Active ]

Introduction

As a result of different regional allocations to the fixed satellite service and the broadcasting satellite service in the 12 G Hz band, several interregional sharing situations arise between these space services.

The World Administrative Radio Conference for planning the broadcasting-satellite service in the 12 GHz frequency band, Geneva, 1977 took the following action:

— it adopted a detailed orbital position and frequency assignment Plan for the broadcasting-satellite service in Region 1 (11.7 to 12.5 GHz) and Region 3 (11.7 to 12.2 GHz);

— it adopted a set of provisions governing the broadcasting-satellite service in Region 2 pending the establishment of a detailed plan. These provisions included division of the available orbital arc into separate segments for the broadcasting-satellite service and the fixed-satellite service, and a Regional Administrative Conference to be held not later than 1982 for the purpose of carrying out detailed planning for the broadcasting-satellite and fixed-satellite services in Region 2 (see Recommendation No. Sat-8 of the WARC-BS-77 (see also Resolution No. 701 of the WARC-79).

Subsequently, the W ARC -79 allocated separate frequency bands for the two space services in Region 2, thus obviating the need for orbital arc segmentation (see Resolution No. 504 of the WARC-79). The band allocated to the broadcasting-satellite service has a lower limit of 12.2 GHz as determined at the Regional Administrative Radio Conference, RARC SAT-83 - and an upper limit of 12.7 GHz. The various space service sharing situations are summarized in Table I which makes reference to the applicable footnotes in the Radio Regulations. Table 1 does not include the terrestrial services allocated in the band 11.7 to 12.75 GHz.

Characteristics of typical fixed-satellite systems are contained in Report 207. However, in Region 1, the band 12.5 to 12.75 GHz (see note) is allocated exclusively to the fixed-satellite service which may make its parameters different from fixed-satellite systems in which sharing is required.

Note. - Radio Regulation footnotes 848, 849 and 850 allocate this band on a shared basis to other services in some countries of Region 1.