標準號：IS 13986 Pt.2-1994
發布日期：1994/4/1 12:00:00
實施日期：1999/12/31 12:00:00
適用范圍：This part of IEC 1079 applies to the tuner unit of a receiver for the direct reception of satellite broadcast transmissions in the 12 GHz band. The channels, are those defined by WARC BS-77 and RARC SAT-83 [1]* and the systems are those of CCIR Recommendation 650 [1].The object of this part of IEC 1079 is to define the conditions and methods of measure-ment to be applied. This part does not specify performance requirements.The tuner unit comprises the channel selector and FM demodulator. The input to this unit is a group of intermediate frequency signals, usually in the range 1 GHz to 2 GHz, which is provided from an associated outdoor unit. The outdoor unit includes at least a micro-wave antenna and the frequency converter to the first intermediate frequency.Methods of measurement on outdoor units are described in Part 1 of International Standard IEC 1079.A decoder for baseband and data signals may be included in the tuner unit. Methods of measurement of the decoder, however, are described in Parts 4 and 5 of International Standard IEC 1079 (under consideration).