This part of IEC 1079 applies to the conditions and methods of measurement of overall performance of receiver systems comprising an outdoor unit and a DBS tuner unit for direct reception of satellite broadcast transmissions in the 12 GHz band. The channels are those defined by WARC BS-77 and RARC SAT-83 and the systems those of CCIR Recommendation 650 [1]•. The specifications of the limit values of the various parameters of the receiver systems are outside the scope of this standard. Although individual pe rformance of an outdoor unit and a DBS tuner unit can be measured by the methods defined by parts 1 and 2 of IEC 1079, measurements of overall performance of a receiver system consisting of an indoor unit and a DBS tuner unit are also necessary for individual receiver installations. A decoder for baseband and data signals may be included in the receiver. Methods of measurement of the decoder, however, are described in parts 4 and 5 of IEC 1079. NOTE - Measurement items for overall performance are confined to those which cannot be obtained by the measurements of each individual unit or may be affected by the combination of the units in the receiver.