Methods of measurements on receivers for satellite broadcast transmission in the 12 ghz band . part 3 : electrical measurements of overall performance of receiver systems comprising an outdoor unit and a dbs tuner unit 12 ghz波段卫星广播发射用接收机的测量方法.第3部分:包括一台室外装置和一台直播系统调谐装置的接收系统总性能的电测量