This standard specifies the minimum performance requirements for high-fidelity FM radio tuners. This standard applies to FM radio tuners designed for receiving FM radio and primarily used in home high-quality playback systems. GB/T 15294-1994 Minimum performance requirements for high-fidelity FM radio tuners GB/T15294-1994 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
GB/T15294—1994
High fidelity FM radio tuners
Minimum performance requirements
Minimum performance requirements on high fidelity FM radio tuners
Promulgated on December 6, 1994
State Bureau of Technical Supervision
Implementation on July 1, 1995
National Standard of the People's Republic of China
High fidelity FM radio tuners
Minimum performance requirements
Minimum performance requirements on high fidelity FM radio tuners
GB/T15294—1994
This standard equivalently adopts the international standard IEC581-2(1986) "Minimum performance requirements for high fidelity audio equipment and systems" Part 2: FM radio tuners.
1 Subject matter and scope of application
This standard specifies the minimum performance requirements for high-fidelity FM broadcast tuners. This standard applies to FM broadcast tuners designed for reception of FM broadcasts and primarily for use in high-quality home playback systems. 2 Reference standards
GB6163 Measurement methods for FM broadcast receivers GB/T14197 Preferred matching values ​​for interconnection of sound system equipment 7 Application of connectors for interconnection of sound system equipment GB/T14947
SJ/Z9140.1
IEC268-1
Sound system equipment Part 1: Overview
EC315-41 Measurement methods for radio receivers of various emission types Part 4: Radio frequency measurements for FM sound broadcast receivers 3 Test conditions
Ambient temperature: 15~35℃,
Relative humidity: 45%~75%,
Atmospheric pressure: 86~106kPa;
Power supply voltage: AC voltage rated value ±1%, DC voltage rated value ±5%,
Power supply frequency: 50±0.5Hz.
Input signal: Unless otherwise specified, all measurements shall be made at the rated minimum signal level required for high fidelity performance as specified in 4.1.
Instructions for use:
1IEC315-4 has been translated in the Third Research Institute of the Ministry of Electrical and Mechanical Services. Approved by the State Bureau of Technical Supervision on December 6, 1994 and implemented on July 1, 1995, GB/T15294—1994 Minimum performance requirements and measurement methods for basic parameters Rated minimum input signal level required for high-fidelity performance 50dB signal-to-noise ratio sensitivity Effective frequency range Balance Total harmonic distortion Measurement method Change the input signal level, repeat the measurement according to Articles 4.3, 4.5, 4.7, 4.8, 4.9 and 4.11, and record the input level that just meets the minimum requirements. The maximum value among these levels is the minimum input signal level required for high-fidelity performance. This rated value is specified by the product standard
According to Article 35.4 of GB6163: 50dB signal
≤70dBf
equivalent electromotive force is
≤3.5mV/300Q or
≤1.75mV/75Q
<50dBf
noise ratio sensitivity. During measurement, the tuner works in stereo mode with an equivalent electromotive force of:
body sound mode, using a 22.415000Hz bandpass filter and a true RMS table, and the output signal satisfies the following formula:
In the formula: Ux
reference output voltage
noise output voltage
according to Chapter 20 of GB6163: voltage-frequency characteristics of the whole machine (with the output level at 1000Hz as a reference)
according to Chapter 38 of GB6163: balance, including changes with the position of the volume controller. If there is an audio gain controller, it should be placed at the maximum gain position according to Chapter 17 of GB6163: voltage harmonic distortion of the whole machine. Unless otherwise specified, the reference output voltage Ux for measurements is the output voltage generated by a modulation frequency of 1kHz and a frequency deviation of ±67.5kHz (stereo). 40~12500Hz. The tolerance is ±1.5dB. If a wider effective frequency range is required, the tolerance of ±1.5dB still applies. ≤2dB (250~6300Hz). The power supply voltage is within the range of ±10% of the rated value and the frequency is 1000Hz with a frequency deviation of ±75kHz (any value within the range; single sound) or ±67.5kHz (stereo).
For each stereo RF tuner unit, each channel should be measured separately. At this time, the other channel is not modulated.
The RF input signal level is 90dBf
For the measurement of low frequency deviation values, the following input level requirements should be met when the signal-to-noise ratio is 50dB:
a. If there is a tuning indicator, perform it according to the manufacturer's instructions when AFC is not working;
b. Perform it with AFC
any value between
d. When the modulation frequency is 5kHz, the RF input level is 70dBf and the frequency deviation is 6.75kHz,
at the modulation frequency of 40 Hz, RF input level of 70dBf and frequency deviation of 67.5kHz, operating frequency separation over time, unweighted (bandwidth-limited) signal-to-noise ratio, weighted signal-to-noise ratio, capture ratio, AM suppression, selectivity, 4.13 Suppression of unwanted signals entering from the antenna, 4.13.1 Single-signal IF suppression, 4.13.2 Single-signal image suppression |tt||4.13.3 Suppression of single signal false response
False response caused by RF nonlinearity
4.15 Suppression of fundamental and harmonic waves of pilot and subcarrier
GB/T15294—1994
According to Chapter 31 of GB6163: Change of tuning frequency with
time
According to Chapter 36 of GB6163: Separation
According to Article 6.3 of GB6163: Broadband method and
Chapter 34: Stereo signal-to-noise ratio.
Minimum requirement
<30kHz (AFC working) Turn on the power
Start from 60s until the temperature reaches a stable state
(250~6300Hz)
≥20dB
(630012500Hz)
Frequency deviation: ±75kHz (mono) or
Measured with a 22.4~15000Hz bandpass filter ±67.5kHz (stereo) and a true RMS meter
According to IEC315-4 Chapter 23: Signal-to-noise ratio, Article 66.1: Sequential method. At 200~15000Hz frequency deviation: ±75kHz (mono) or after the bandpass filter, use the A weighting network and true RMS table specified in SJ/Z9140.1 to replace the PS noise weighting network and quasi-peak table
according to Chapter 13: Capture ratio of GB6163. If possible, the tuner works in mono mode with a frequency deviation of 75kHz
according to Chapter 14: AM suppression
of GB6163 (simultaneous modulation method). If possible, the tuner works in mono mode
according to GB6163 Chapter 9: Dual signal selection
according to GB6163 Chapter 10: Intermediate frequency suppression
according to GB6163 Chapter 11: Image suppression
according to GB6163 Chapter 12: False response suppression
according to GB6163 Article 16.1: Sinusoidal modulation method of RF intermodulation. The input signal level when tuning the frequency should be less than the limiting sensitivity, and the frequency interval is ±800kHz. If possible, the tuner works in mono modewwW.bzxz.Net
according to GB6163 Chapter 41: Suppression of pilot, subcarrier and its harmonics
Tu67.5kHz (stereo)
≤<3dB
≥—7dB(±200kHz)
≥7dB(±300kHz)
≥20dB(±400kHz)
≥65dB
≥60dB
≥40dB
≥46 dB
38kHz and its harmonics
Suppression of subcarrier modulation other than stereo signals
4.16.1 Suppression of signals in the range of 16 to 22kHz and
54 to 75kHz
4.16.2 Suppression of signals in the range of 62 to 73kHz (SCA
suppression)
a. Mechanical
b. Electrical
Characteristics to be specified
GB/T15294—1994
According to Chapter 30 of IEC315-4: Suppression of subcarrier modulation other than stereo
signals
In mono mode, only for signals in the range of 16 to 22kHz
According to Chapter 42 of GB6163: SCA suppression
Under consideration
When the tuner is used in areas with SCA broadcastingAccording to GB/T14947
According to GB/T14197
The characteristics listed in this standard must be followed in the manufacturer's manual, instructions and technical specifications
Note: In this standard, the noise test uses a true effective value table, or an average value response table calibrated according to the effective value of the sinusoidal signal. Additional remarks:
This standard is proposed by the Ministry of Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the Electronic Standardization Institute of the Ministry of Electronics Industry. This standard was drafted by the Guangdong Electronic Products Supervision and Inspection Institute and Foshan Radio Factory No. 1. The main drafters of this standard are Liang Hongfei, Huang Changmin, and Liu Yusong.
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