This standard specifies the technical parameter requirements for satellite TV/FM carrier channels. This standard applies to domestic satellite TV/FM carrier channels in the 4/6GHz frequency band of fixed services, and also applies to TV/FM carrier channels of leased international communication satellite transponders. GB/T 11443.4-1989 General Technical Requirements for Domestic Satellite Communication Earth Stations Part 4: TV/FM Carrier Channels GB/T11443.4-1989 Standard Download Decompression Password: www.bzxz.net

National Standard of the People's Republic of China
Domestic satellite communication earthstations-General technical requirements Part 4: Television/frequency modulation carrier channel
Subject content and scope of application
This standard specifies the technical parameter requirements for satellite television/frequency modulation carrier channels. GB 11443. 4 -89
This standard applies to domestic satellite television/frequency modulation carrier channels in the 4/6GHz frequency band, and also applies to television/frequency modulation carrier channels rented from international communication satellite transponders.
2 Reference standards
GB1583 Color television image transmission standard
GB11443.1 General technical requirements for domestic satellite communication earth stations Part -: General requirements 3 Hypothetical reference circuit
The hypothetical reference circuit is shown in Figure 1:
Hypothetical reference circuit
TV center
Earth station
-07,- 04 Approved
State Bureau of Technical Supervision 1989
Satellite TV: FM hypothetical reference circuit
Earth station
Implementation on 1990-03-01
4 Technical requirements for satellite TV channel characteristics
4.1 Polarization mode
Domestic satellite: linear polarization;
Leased satellite: dual circular polarization.
4.2 Frequency range
GB 11443. 4 -89
Transmission: 5925~6425MHz (or extended to: 5850～6650MHz) Reception: 3700～4200MHz (or extended to: 3400～4200MHz). 4.3 RF carrier frequency tolerance
Not worse than ±250kHz
This indicator includes the initial deviation and long-term drift value of the carrier frequency. 4.4 Equivalent isotropic radiated power (EIRP) of earth station The EIRP transmitted by the earth station required by the TV carrier is related to the satellite parameters used, the beam coverage type, and the geographical location of the earth station. The actual EIRP transmitted by the earth station should be determined according to the transmission plan and adjusted with the assistance of the central station during the commissioning test. 4.5 Transmitting carrier power stability
Not worse than -1.5→+ 1dB /d
This indicator, in addition to adverse weather conditions, includes unstable factors such as high power amplifier output power instability, antenna transmission gain instability, antenna pointing error and tracking error.
4.6 Out-of-beam radiation (EIRP) density
Out-of-beam radiation (EIRP) density in the direction of adjacent satellites is allowed as follows: D = 32- 251g6 (2.5 ≤7°)
D = 35-251ge (9.2°<048°)
Formula: D
(48°<180°)
EIRP energy density in 4kHz bandwidth, dBW/4kHz, an angle away from the main axis, in degrees. 4.7 Spurious radiation component
Not worse than 4dBW/4kHz
This indicator refers to the spurious radiation (EIRP) emitted by the earth station outside the allocated frequency band, that is, falling within the frequency bands of 5925~6425MHz and 140)0~14500MHz, including single-frequency signals, band noise and other useless signals, but excluding intermodulation signals. 4.8 Intermediate frequency bandwidth of the transmission link
Full transponder: 30MHz
Note, it can be expanded to 36MHz without interfering with the operation of adjacent transponders 14.9 Characteristics of the intermediate frequency to radio frequency unit of the transmitting equipment or the radio frequency to intermediate frequency unit of the receiving equipment Group delay/frequency characteristics and amplitude/frequency characteristics are shown in Appendix A (supplement). 5 Requirements for satellite TV image and sound quality
The following indicators should meet the requirements for 99% of the time in the worst month. 5.1 Image Signal-to-Noise Ratio
Class I and II stations: unweighted value not worse than 38.8dB; unified weighted value not worse than 50.0dB
Class III stations: unweighted value not worse than 33.0dB (30.3dB for leased satellite)211
GB 11443.4—89
unified weighted value not worse than 44.2dB
Note: For the unified weighted network characteristics, see Appendix B (Supplement). 5.2 Luminance/Chroma gain inequality
Not worse than ±10%
5.3 Luminance/Chroma delay inequality
Not worse than ±50ns
5.4 Differential gain distortion
Not worse than ±8%
Differential phase distortion
Not worse than ±5°
5.6 Video amplitude/frequency characteristics
0.5~+0.5dB
(0.5~5.0MHz)
(5.0~5.5MHz)
- 1.0 ～ + 1.0dB
≥- 3.0dB (at 6.0MHz)
≤.- 40dB (at 6.6MHz)
5.7 Line time waveform distortion
Not worse than ± 2%
5.8 Field time waveform distortion
Not worse than ±3%
5.9 Idle sound channel noise level
Not worse than 42dBqops
Note: For weighting network, see Appendix C (Supplement). 5.10 Sound harmonic distortion
Not worse than 1.0% (0.04～0.125kHz) 0.5% (0.125~7.5kHz)
Note: The sound output level is 6dBr.
5.11 Amplitude/frequency characteristics of accompanying sound
- 2.0- +0.5dB (0.04~0.125k Hz)3 (0.125 ～10kHz)
- 0.5- +0.5dB
3 (10～14kHz)
- 2.0 - + 0.5dB
3.0- + 0.5dB
3 (14~15kHz).
6 Technical requirements for satellite TV modulation parameters
Modulation mode
Image uses positive polarity FM;
Audio uses subcarrier FM.
6.2 Peak-to-peak frequency deviation of main carrier caused by image signal [domestic: 18.1～ 23.0MHz;
rental: 16.8MHz.
6.3 Peak-to-peak frequency deviation of main carrier caused by companion signal [domestic: 2.5~～3.1MHz
rental: 2.3MHz.
GB 11443. 4 --89
This index refers to the deviation of the companion audio signal generated by the amplification network of the image signal after the amplification processing. 6.4 Energy diffusion signal
Waveform: symmetrical one-angle wave,
Frequency: 25±2Hz;
Frequency deviation (peak-to-peak)
When there is image signal: domestic 2MHz, rented 1MHz. When there is no image signal: domestic 4MHz, rented 2MHz. 7 Technical requirements for satellite TV baseband characteristics
7.1 TV standard
PAL/D system (625/50)
7.2 Image baseband
10Hz ~ 6 MHz
7.3 Audio baseband
0.04~15kHz
Single-channel audio subcarrier frequency
7.5 Audio deviation
±100kHz
Note: 0dB m input at the transmitting end, the test tone is 1.42kHz. 7.6 Video signal pre-emphasis characteristics
See Appendix D (supplement).
7.7 Audio signal pre-emphasis characteristics
See Appendix E (supplement).
Satellite TV earth station interface.
8.1 Video interface
Input and output levels: 1V. -r
Input and output impedance: 7592
Return loss is no less than 30dB
8.2 Blind interface
Input level: 0 dBr
Output level: 0±6dBr, can be adjusted down by 12dB Input and output impedance: 6002 (one balanced, one unbalanced) 213
GB11443.4--89
Appendix A
Group delay/frequency characteristics and amplitude/frequency characteristics (supplement)
The group delay/frequency characteristics and amplitude/frequency characteristics from the intermediate frequency to the radio frequency unit shall meet the data requirements of Figure A1 and Table A1. Group delay/frequency characteristics
Amplitude/frequency characteristics
Group delay/frequency characteristics and amplitude/frequency characteristics Table A1
Appendix B
Characteristics of unified weighted networks
(supplement)
The unified weighted network used to measure the continuous random noise of television images refers to CCIR Recommendation 567-1. The weighted network structure and characteristics are shown in Figures B1 and B2. B1 Unified weighted network
Let the year be installed
GB 11443. 4 --89
Unified weighted network structure
Figure: L =zat, Cr/z.- Rt=az, R2=Z. /agz. =752 t= 245msa=4.5
B2 Insertion loss A
A = 101g
1 +［(1
At high frequency Ao0-→20lg（1 +a）=14.8（dB）B3
Uniform weighted network characteristicsbZxz.net
The network characteristics are shown in Figure B2.
Frequency, MHz
Uniform weighted network characteristics
GB11443.4--89
Appendix C
Sound weighted network characteristics
(Supplement)
This appendix is ​​used for the measurement of the weighted value of television sound noise, referring to the CC1R recommendation 486-3 weighted network structure
C2 weighted network Network curve
Weighted network structure
GB11443.4-89
Frequency, Hz
Weighted network characteristics
Frequency, Hz
Frequency single-weighted network frequency response maximum tolerance Appendix D
Satellite TV image pre-emphasis, de-emphasis network (supplement)
This appendix refers to the adoption of CCIR Recommendation 405-1. D1 Pre-emphasis network
Consultation year band category
De-emphasis network
GB 11443.4—89
Manual supply
Image pre-emphasis network
Image de-emphasis network
Download
Television image pre-emphasis characteristics
625 lines
GB 11443. 4 - 89
Low frequency. MHz
Image signal pre-emphasis characteristics
Appendix E
Audio pre-emphasis characteristics
(Supplement)
This appendix refers to CCITT Recommendation 17.
The audio pre-emphasis characteristic curve should be determined by formula E1. The pre-emphasis characteristic curve calculated according to formula B1 passes through the points in Table E1. The de-emphasis network characteristics of the receiving equipment should be complementary to the pre-emphasis network characteristics. 75+(@/3000)2
L = 10lg
1 + (@/3000)
Wu Zhong: ·
Angular frequency relative to frequency f, rad/s;
Data shell fee download
Insertion loss, dB
Frequency, kHz
GB11443.4-89
Insertion loss, dB
Note: When the test frequency is 800Hz, the error between the tested pre-emphasis characteristic curve and the theoretical curve should be less than 0.25dBAdditional instructions:
This standard is proposed by the Ministry of Posts and Telecommunications of the People's Republic of China. This standard is under the jurisdiction of the Post and Telecommunications Industry Standardization Research Institute of the Ministry of Posts and Telecommunications. This standard was drafted by the 54th Institute of the Ministry of Machinery and Electronics Industry. The main drafter of this standard is Zhang Yinxiang.
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