GB/T 12752-1991

GB/T 13858.1-1992 Specification for colour TV modulation and demodulation equipment(1TV+4 sound program)used in middle distance terrestrial analog radio-relay systems GB/Z 41297-2022 General technical requirements for tourism informatization service based on M2M technology GB/T 4312.2-1984 Technical parameters and measuring methods for FM stereophonic broadcasting transmitters with supplementary channel GB/T 4312.1-1984 Technical parameters and measuring methods for FM broadcasting transmitters--Monophonic and stereophonic GB/T 6281-1986 Co-channel interference standards required in the land mobile services (16k0F3E) GB/T 6282-1986 Interface parameters of the 25 to 1000MHz land mobile telecommunication network connecting to public telecommunication network through subscriber lines GB/T 6277-1986 Methods of measurement for television transmitters GB/T 6662-1986 Methods of measurement for equipment used in terrestrial radio-relay systems--Part 1:Measurements common to sub-systems and simulated systems--Section three--Measurements in the intermediate-frequency range