ITU-R REPORT BO.632-4 PDF

Introduction

There are a large number of possible methods of modulation for the broadcasting satellite service, the choice depending on several factors. This Report discusses different technically suitable methods for the broadcasting-satellite service in all the frequency bands allocated to this service.

As regards the broadcasting-satellite service in the 12 GHz band, it should be borne in mind that the planning at the WARC-BS-77 was carried out on the assumption that a television programme would have only one sound channel, transmitted using a frequency-modulation sub-carrier positioned at the inter-carrier spacing of the television system used in the service area under consideration. Nevertheless, the WARC-BS-77 did not exclude the use of modulation signals having different characteristics, provided that the use of those different characteristics did not result in greater interference than that caused by the system considered in the Plan.