1、 G Y /T 140 1999 5 1000MHz Specifications and methods of measurement on system outlets 5 1000MHz used for CATV systems 1999-11-17 2000-02-01 1998 40 1998 GB/T11318 121996 12 GY/T 140-1999 1 1 5 1000MHz 5 1000 MHz 2 GY/T 1061999 GB/T 65101996 GBT/T11318.11996 1 GB/T11318.121996 12 3 TV TV FM 4 4.1 4.
2、1.1 GB5465.2 4.1.2 4.2 1 5 1000MHz G Y /T 140 1999 Specifications and methods of measurementon system outlets 5 1000MHz used for CATV systems 1999-11-17 2000-02-01 GY/T XXXX-XXXX 2 1 1 dB 5 300MHz 0.5 300 1000 MHz 1.0 TV 2.5 FM 10 2 TV dB 1.5 0.5 3 dB 14 5 65 MHz 16 87 550 MHz 14 550 MHz 14 87 108 M
3、Hz 4 TVFM dB 26 5 dB 90 5 5.1 5.1.1 5.1.1.1 1 1 5.1.1.2 a b c RF RF Out In GY/T XXXX-XXXX 3 5.1.2 5.1.2.1 2 2 5.1.2.2 a A1 A2 D b A2 C A2 5.2 5.2.1 5.2.1.1 3 3 5.2.1.2 RF RF Out In A1 dB dB A2 GY/T XXXX-XXXX 4 a b c d 5.2.2 5.2.2.1 4 4 5.2.2.2 a b c 20dB d e 5.3 5.3.1 5.3.1.1 1 5.3.1.2 a b c 5.3.2 5
4、.3.2.1 2 5.3.2.2 a 5.1.2.2.a A2 A2 b GY/T XXXX-XXXX 5 b A2 A2 c 2 b c 5.4 5.4.1 5 5 5.4.2 5.4.2.1 120dB V A 5.4.2.2 5 5.4.2.3 B 5.4.2.4 S = A M G B S dB A dB V M dB G dB B dB V 6 GB/T11318.11996 5 1000MHz 1998 40 1998 5 1000MHz GY/T 1061999 GB/T 65101996 GB/T 11318.11996 1 GB/T11318.121996 12 GB/T11318.121996 12 5 1750MHz 5 550MHz 1000MHz IEC100D/3/CDV 8.3.4 GB/T11318.11996 1 HFC 7
