GY GY/T1962003 Technical specifications for coverage networks of FM sound broadcasting 行业标准信息服务平台 2003-10-29 2003-12-01 GY/T196—2003 1991 ITU-R P.370-7 ITU-R BS.412-9 行业标准信息服务平台 GY/T 196—2003 1 VHF 2 GB/T 4311-2000 GB6364-1986 GB/T 7400.1 GB/T 7400.2 GB/T14433-1993 GJB2081-1994 87MHz 108MHz 108MHz 137MHZ GJBZ 20093-1992VHF/UHF ITU-R BS.412-9 VHF ITU-R BS.704 ITU-R IS.1009 87MHZ 108MHz 108MHZ 137MHz ITU-R P.370-7 30MHZ 行业标准信息服务平台 1000MHz VHF/UHF 3 3.1 service field strength 50 50 50% 3.2 normalized service field strength Ei 50 50 1kw 3.3 interfering field strength 50 T T GY/T 196—2003 T 50% T 10% 3.4 normalized interfering field strength Ei 1kw 1 50% T 10% 3.5 minimum usable field strength Emin 3.6 usable field strength Eu 3.7 nominal usable field strength Enon 3.8 nuisance field dB 3.9 field strength for rebroadcasting 3.10 effective height of the transmitting antenna hi 3km n15km ha hr 息服务平 3.10.1 height of transmitting antenna ha 3.10.2 relative height of transmitting antenna field hr 3km²15km 3.11 degree of terrain irregularity 4 h 2