Detail of GB/T 6163-1985

Introduction of GB/T 6163-1985

Section 1 General 1 Application scope This standard is applicable to the standard measuring method of electroacoustic performance measurement of monophonic and stereophonic radio receivers for FM broadcast transmissions (including tuner, car radio, FM receiving part in combinational machine, as well as dedicated radio receivers for FM broadcast transmissions——all the above are referred to as receivers) . 2 Terms and requirements 2.1 values for voltage and current root mean square (r.m.s.) quantities, unless otherwise stated 2.2 presentation of level Levels of power, voltage and field strength are expressed in decibels, as shown in Table 1. ... ... ... ... 2.3 carrier frequency the mean value of the instantaneous frequency or the frequency generated in the absence of modulation, and for a perfect modulation system in which no d.c. component and no non-linear distortion are involved, the two values are the same 2.4 instantaneous frequency deviation the difference between the instantaneous frequency of the modulated carrier frequency signal and the carrier frequency 2.5 peak frequency deviation the peak value of the instantaneous frequency deviation 2.6 maximum system deviation the maximum peak frequency deviation specified for the system under consideration, which is ±75 kHz in China 2.7 standard modulation frequency see Table 2 for optimized modulation frequency

Contents of GB/T 6163-1985

Section 1 General 1 Application scope 2 Terms and requirements 3 Main test circuit 4 Measuring instrument 5 Measuring conditions Section 2 Sensitivity 6 Signal-to-noise ratio 7 Sensitivity 8 Input-output characteristics Section 3 Rejection of interfering signals 9 Two signal selectivity 10 Intermediate frequency rejection 11 Image frequency rejection 12 Spurious response rejection 13 Capture ratio 14 Rejection of amplitude modulation 15 Tuning characteristics 16 Radio-frequency intermodulation Section 4 Fidelity 17 Total voltage harmonic distortion 18 Total acoustic pressure harmonic distortion 19 Maximum active power 20 Total voltage frequency characteristics 21 Total acoustic pressure frequency characteristic Section 5 Other performances 22 Hum 23 Single-signal whistles 24 Self-oscillation 25 Audio frequency mechanical vibration 26 High-frequency mechanical vibration 27 Frequency range 28 Intermediate frequency 29 Tuning indication accuracy 30 Scale error 31 Change in tuning frequency 32 Automatic frequency control characteristics 33 Local oscillator radiation Section 6 Stereo 34 Stereo signal-to-noise ratio 35 Stereo sensitivity 36 Separation 37 Non-linear crosstalk 38 Balance degree 39 Stereophonic identicality 40 Stereo intermodulation 41 Rejection to pilot frequency, subcarrier frequency and their harmonics 42 SCA rejection