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GB/T 26683-2017: General specification for digital terrestrial set-top box
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Basic data | Standard ID | GB/T 26683-2017 (GB/T26683-2017) | | Description (Translated English) | General specification for digital terrestrial set-top box | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | M74 | | Classification of International Standard | 33.160.25 | | Word Count Estimation | 54,579 | | Date of Issue | 2017-09-07 | | Date of Implementation | 2018-04-01 | | Older Standard (superseded by this standard) | GB/T 26683-2011 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | GB/T 26683-2017: General specification for digital terrestrial set-top box---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
General specification for digital terrestrial set-top box
ICS 33.160.25
M74
National Standards of People's Republic of China
Replace GB/T 26683-2011
Terrestrial digital television receiver general specification
Published on.2017-09-07
2018-04-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Administration issued
Content
Foreword III
1 Scope 1
2 Normative references 1
3 Terms and definitions, symbols, abbreviations 2
3.1 Terms and Definitions 2
3.2 Symbol 2
3.3 Abbreviations 2
4 General requirements 3
4.1 Normal use conditions 3
4.2 Graphic symbols for equipment 3
4.3 Appearance and structural requirements 3
4.4 Interface Requirements 3
5 Technical requirements 3
5.1 Overview 3
5.2 RF Demodulation and Channel Decoding Requirements 4
5.3 Transport Stream Decoding Requirements 9
5.4 baseband video output performance requirements 10
5.5 Baseband Audio Output Performance Requirements 13
5.6 Digital Audio Output Performance Requirements 14
5.7 Functional Requirements 14
5.8 Remote Control Performance and Remote Transmitter Performance Requirements 15
5.9 Power Adaptability Requirements 15
5.10 Electromagnetic Compatibility Characteristics Limit 16
5.11 Security Requirements 16
5.12 Reliability Requirements 16
5.13 Environmental Test Requirements 16
5.14 Unpacking Inspection Requirements 16
5.15 Process Assembly Inspection Requirements 16
6 Measurement methods 16
6.1 Graphical symbols, appearance and structure of equipment, interface inspection method 16
6.2 Radio Frequency Demodulation and Channel Decoding Measurement Method 16
6.3 Transport stream decoding characteristics measurement method 17
6.4 Baseband video output characteristics measurement method 17
6.5 Baseband audio output characteristics measurement method 19
6.6 Digital audio output characteristics measurement method 20
6.7 Function Measurement Method 20
6.8 Remote control performance and remote transmitter measurement method 20
6.9 Power Adaptability Measurement Method 21
6.10 Electromagnetic compatibility characteristic limit measurement method 21
6.11 Safety Test Method 21
6.12 Reliability Test Method 21
6.13 Environmental test methods 21
6.14 Unpacking inspection method 21
6.15 Process Assembly Inspection Method 21
7 Inspection rules 21
7.1 Stereotype test 21
7.2 Settlement inspection 23
7.3 Routine inspection 25
8 Marking, packaging, transportation, storage 26
8.1 Mark 26
8.2 Packaging 26
8.3 Transportation 27
8.4 Storage 27
Appendix A (Normative) Acceptable Errors 28
Appendix B (informative) Radio Frequency VHF and UHF Band Frequency Allocation Table 29
Appendix C (Normative Appendix) Multipath Channel Model 31
Appendix D (informative) Other multipath channel models 38
Appendix E (informative) Remote transmitter function 41
Appendix F (normative appendix) Unpacking inspection content and non-conformity criteria 42
Appendix G (normative appendix) Process assembly inspection content and non-conformity criteria 45
Appendix H (Normative Appendix) Contents of normal temperature performance test and failure criteria 46
Appendix I (Normative Appendix) Environmental Test Contents and Disqualification Criteria 48
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 26683-2011 "General Specification for Terrestrial Digital TV Receiver", this standard is in line with GB/T 26683-2011
In addition to the editorial changes, the main technical changes are as follows.
--- Terms, definitions, symbols and abbreviations add "symbols" (see 3.2);
--- RF demodulation and channel decoding requirements to increase "operating mode 8", "working mode 9" and "working mode 10" (see 5.2.3);
--- RF demodulation and channel decoding requirements to increase the "suppression of two-path long-echo ability" (see 5.2.16), "suppress three-path long-echo ability" (see
5.2.17), “Suppress channel disturbance capability 1 under fixed reception conditions” (see 5.2.18), “Suppress channel disturbance under fixed reception conditions”
Capability 2” (see 5.2.19), “Suppression of single-frequency interference capability” (see 5.2.20) and “Other multipath models” (see 5.2.21);
--- Video decoding features removed "The receiver should meet the requirements of GB/T 17975.2-2000 or GB/T 20090.2-2006
The frame rate is 25 Hz, 4.3 and 16.9 aspect ratio code stream decoding requirements (see.2011 version 5.3.2.1); added
"The receiver shall comply with the code stream conforming to the frame rate of 25 Hz, 4.3 and 16.9 in accordance with GB/T 20090.16.
Decode and meet the requirements of SJ/T 11594.1-2016" and "Receivers can be specified for other mainstream video coding standards
The code stream is normally decoded" (see 5.3.2.1);
--- Audio decoding features removed "The receiver should have decoding conforming to MPEG-1 Layer II in GB/T 17975.3-2002 or
The function of the digital audio stream specified in GB/T 22726-2008 can be decoded to meet the requirements of ETSITS102366.
Requirements for digital audio streams or other digital audio streams" (see.2011 version 5.3.2.2); added "receiver response
The digital audio stream conforming to the provisions of GB/T 22726 is decoded and meets the requirements of SJ/T 11594.2-2016" and "connected"
The receiver can normally decode the audio stream specified by other mainstream audio coding standards. " (see 5.3.2.2);
--- Removed "Conditional Reception" (see 5.3.6 of the.2011 edition);
--- Removed the "Digital Content Protection Requirements" (see 5.4 of the.2011 edition);
--- Removed the conditional access interface of Appendix G (informative) (see Appendix G of the.2011 edition);
--- Added Appendix B (informative) radio frequency TV VHF and UHF frequency allocation table (see Appendix B), Appendix C (Specification
Addendum) Multipath channel model (see Appendix C), Appendix D (informative) other multipath channel models (see Appendix D).
Please note that some of the contents of this document may involve patents. The issuing organization of this document is not responsible for identifying these patents.
This standard was proposed by the Ministry of Industry and Information Technology of the People's Republic of China.
This standard is under the jurisdiction of the National Technical Committee for Standardization of Audio, Video and Multimedia Systems and Equipment (SAC/TC242).
This standard is mainly drafted by. China Electronics Technology Standardization Research Institute, National Digital Audio Video and Multimedia Product Quality Supervision and Inspection
Xin, Shenzhen Digital TV National Engineering Laboratory Co., Ltd., Sichuan Changhong Electric Co., Ltd., Qingdao Hisense Electric Co., Ltd.
Company, Qingdao Haier Electronics Co., Ltd., TCL Group Co., Ltd., Shenzhen Skyworth-RGB Electronics Co., Ltd., BOE Technology
Group Co., Ltd., Nanjing Panda Electronics Co., Ltd., Tsinghua University, Gaotuo Xunda (Beijing) Technology Co., Ltd., Shanghai HD Digital
Technology Industry Co., Ltd., Beijing Haier IC Design Co., Ltd., Beijing Zhongtian Lianke Technology Co., Ltd., Hangzhou Guoxin Technology Co., Ltd.
Co., Ltd., Shenzhen Lihe Microelectronics Co., Ltd., Guangzhou Guangsheng Digital Technology Co., Ltd., Shenzhen Core Technology Co., Ltd., Enzhi
Pu Semiconductor (Shanghai) Co., Ltd., Ruidi Kechuang Microelectronics (Beijing) Co., Ltd., Mai Ling (Shanghai) Microelectronics Co., Ltd., Guangzhou Vision Source
Sub-Technology Co., Ltd., Jiangsu Yinhe Electronics Co., Ltd., National Radio and Television Product Quality Supervision and Inspection Center, Industry and Information
The Fifth Institute of Electronics, Shanghai Digital TV National Engineering Research Center Co., Ltd., Beijing Digital TV Engineering Laboratory Co., Ltd.
Beijing Taihe Zhiyuan Technology Co., Ltd., Shenzhen Haisi Semiconductor Co., Ltd., Jiangsu Electronic Information Product Quality Supervision and Inspection Institute,
Morningstar Software R&D (Shenzhen) Co., Ltd., Lejin Electronic Research and Development Center Co., Ltd., Tianjin Samsung Electronics Co., Ltd., Nanjing Sharp Electric
Subsidiary Co., Ltd., Shandong Matsushita Electronic Information Co., Ltd., Shanghai Suoguang Imaging Co., Ltd., Lianfa Technology (Hefei) Co., Ltd., Samsung Communications
Technology Research Ltd., Rohde & Schwarz (China) Technology Co., Ltd.
The main drafters of this standard. Hu Peng, Chen Renwei, Chang Lin, Tang Li, Wang Wei, Li Yining, Zhang Linjuan, Han Qiufeng, Wu Wei, Li Wei, Sun Runyu,
Pan Changyong, Jia Wei, Liang Weiqiang, Qiang Hui, Yang Guang, Feng Xianghui, Chen Liheng, Xu Wei, Niu Xiaoru, Guo Xiancheng, Han Wenquan, Wang Hongxin, Zhang Jingping, Zhong Zhiyang,
Lu Guobing, Jia Kai, Cheng Yang, Zhu Xianliang, Yin Huiqing, Fang Haidong, Shi Yi, Wan Minyong, Han Wenfang, Lin Weifeng, Cao Yu, Yang Xing, Lu Gang, Su Yukun,
Liu Yi, Liu Ansheng, Hu Haining, Zhang Wei.
The previous versions of the standards replaced by this standard are.
---GB/T 26683-2011.
Terrestrial digital television receiver general specification
1 Scope
This standard specifies a terrestrial digital TV receiver that supports GB 20600-2006 terrestrial digital TV reception function (hereinafter referred to as
Function and performance requirements, measurement methods, inspection rules, marking, packaging, transportation, storage, etc.
This standard applies to terrestrial digital TV receivers and is the main basis for product design, production, and inspection.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 191 packaging storage and transportation icon
GB/T 2312-1980 Basic set of Chinese character coded character set for information exchange
GB/T 2828.1-2012.Sampling procedures for sampling by sampling - Part 1 . Batch-by-batch inspections by Retrieving Quality of Acceptance (AQL)
plan
GB/T 2829-2002 Periodic inspection count sampling procedures and tables (applicable to the inspection of process stability)
GB/T 5465.2 Graphical symbols for electrical equipment - Part 2. Graphical symbols
GB 8898 Safety requirements for audio, video and similar electronic equipment
GB/T 9383 Sound and television broadcast receivers and related equipment immunity limits and methods of measurement
GB/T 13000-2010 Information Technology General Multi-Bit Coded Character Set (UCS)
GB/T 13837 Limits and methods of measurement of radio disturbance characteristics for sound and television broadcast receivers and related equipment
GB/T 14960-1994 Technical requirements and measurement methods for infrared remote control transmitters for television broadcast receivers
GB 17625.1 Electromagnetic compatibility limit harmonic current emission limit (device input current per phase ≤ 16A)
GB/T 17975.1 Information technology - Generic coding of moving pictures and associated audio information - Part 1
GB/T 20090.16 Advanced audio and video coding for information technology - Part 16. Radio and video
GB 20600-2006 Digital TV terrestrial broadcasting transmission system frame structure, channel coding and modulation
GB/T 22122-2008 Digital TV surround sound sound measurement method
GB/T 22726 multi-channel digital audio codec technical specification
GB 25957 digital TV receiver (set top box) energy efficiency limit value and energy efficiency rating
GB/T 26684-2017 Ground digital TV receiver measurement method
GB/T 26685-2017 Ground digital television receiver measurement method
GB/T 26686-2017 General specification for terrestrial digital television receivers
GB/T 28160-2011 Digital TV Broadcasting Electronic Program Guide Specification
SJ/T 10514-1994 Technical requirements and measurement methods for infrared remote control parts of television broadcast receivers
SJ/T 10919-1996 Color TV broadcast receiver packaging
SJ/T 11324-2006 Digital TV receiving equipment terminology
SJ/T 11325-2006 Digital TV receiving and display equipment reliability test method
SJ/T 11326 Digital TV receiving and display equipment environmental test method
SJ/T 11327-2006 Digital television receiver interface specification - Part 1. Radio
SJ/T 11329-2006 Digital television receiver interface specification - Part 3. Composite video signal interface
SJ/T 11330-2006 interface specification for digital television receivers - Part 4. s.
SJ/T 11331-2006 Digital television receiver interface specification - Part 5. Analog audio signal interface
SJ/T 11332-2006 interface specification for digital television receivers - Part 6. RGB analog primary video signal interface
SJ/T 11333-2006 Digital television receiver interface specification - Part 7. YPBPR analog component video signal interface
SJ/T 11594.1-2016 Digital television receiver terminal audio and video decoding technical requirements and measurement methods - Part 1. Video (AVS)
SJ/T 11594.2-2016 Digital television receiver terminal audio and video decoding technical requirements and measurement methods - Part 2. Audio
(DRA)
3 Terms and definitions, symbols, abbreviations
3.1 Terms and definitions
The following terms and definitions as defined by SJ/T 11324-2006 apply to this document.
3.1.1
Acceptable error acceptablefreefree
The error event that was not corrected within the specified time during signal reception is less than a certain threshold.
3.2 symbol
tD, MAX. This standard specifies the 0dB maximum echo delay that the receiver should be able to resist.
3.3 Abbreviations
The following abbreviations apply to this document.
AEF. Acceptable Error (AcceptableErrorFree)
C/N. Carrier-Noiser Ratio
ECM. Authorization Control Information (EntitementControlMessage)
EIT. Event Information Table (EventInformationTable)
EITp/f. EIT current/follow-up event table (EITpresent/folowing)
EMM. Authorization Management Information (EntitlementManagementMessage)
EPG. Electronic Program Guide (ElectronicProgramGuide)
FS. Full Scale (FulScale)
HDTV. High Definition TV (High Definition TV)
LFE. Low Frequency Enhancement Channel (LowFrequencyEnhancement)
MPEG. Moving Picture Experts Group (MovingPictuteExpertsGroup)
PID. Packet Identifier
PSI. Program Specific Information (ProgramSpecificInformation)
QAM. Quadrature Amplitude Modulation
RF. Radio Frequency (RadioFrequency)
SDTV. Standard Definition Television (Standard Definition Television)
SI. Business Information (ServiceInformation)
UHF. UltraHigh Frequency (UltraHighFrequence)
VHF. Very High Frequency (VeryHighFrequence)
Y/C. Luminance/Chrominance
4 General requirements
4.1 Normal use conditions
The normal use conditions should meet the following requirements.
Ambient temperature. 5 ° C ~ 35 ° C;
Relative humidity. 25%~80%;
Atmospheric pressure. 86kPa~106kPa;
Power supply. 220V 10%-20%, [50 × (1 ± 2%)] Hz.
4.2 Graphic symbols for equipment
Graphic symbols shall comply with the relevant provisions of GB/T 5465.2.
Graphical symbols not defined in GB/T 5465.2, as specified by the product specification.
4.3 Appearance and structural requirements
The appearance of the receiver should be neat and tidy, and the surface should be free of defects such as emboss marks, scratches, cracks, burrs, mildew, etc. The surface coating should not be foamed or cracked.
Fall off and so on.
Metal parts should not be corroded and other mechanical damage, and the infusion should not overflow.
The operation of switches, buttons and knobs should be flexible and reliable, and the parts should be tightened without looseness. The machine should have sufficient mechanical stability.
The characters and graphic symbols of the function shall be correct, clear, correct and firm, and the instructions shall be correct.
4.4 Interface Requirements
The interface requirements are shown in Table 1.
Table 1
Serial number interface type requires technical requirements of the interface
1 RF input must be in accordance with the requirements of SJ/T 11327-2006
2 RF loop output can be selected according to the requirements of SJ/T 11327-2006
Composite video signal output must be in accordance with the requirements of SJ/T 11329-2006
Y/C output can be selected according to the requirements of SJ/T 11330-2006
Y, PB, PR output HDTV essential, SDTV optional according to the requirements of SJ/T 11333-2006
R, G, B output can be selected according to the requirements of SJ/T 11332-2006
4 audio output (two-channel) must be in accordance with the requirements of SJ/T 11331-2006
5 small D-shaped 15-pin VGA output can be selected according to the requirements of SJ/T 11332-2006
6 digital video interface optional to be determined
7 digital audio interface optional to be determined
5 Technical requirements
5.1 Overview
The block diagram of the terrestrial digital TV receiver is shown in Figure 1.
The terrestrial digital television receiver performs the conversion from the RF signal input to the terminal audio and video signal output. Input RF signal is solved
Tuning, channel decoding, sending the output transport stream to the demultiplexing module for demultiplexing, and simultaneously outputting service information/program specific information
(SI/PSI), electronic program guide (EPG) and other information, and the output basic stream is sent to the audio and video decoding module, decoded and sent to the baseband audio and video
Output.
figure 1
5.2 RF Demodulation and Channel Decoding Requirements
5.2.1 Overview
The performance and functional requirements specified in this clause refer to the requirements in the case of acceptable error (AEF). See the regulations on AEF
Appendix A.
5.2.2 Frequency
5.2.2.1 Frequency range
The receiver shall be capable of receiving RF signals on all channels in the local VHF and UHF bands, VHF and
See Appendix B for the UHF band frequency allocation table.
5.2.2.2 Signal bandwidth
Each channel has a bandwidth of 8MHz.
5.2.2.3 Frequency capture range
The receiver should be able to receive RF signals with a frequency offset of no more than ±150 kHz.
5.2.3 Working mode
The receiver shall be able to receive and correctly demodulate the working mode 1~ working mode 7 listed in Table 2, and apply it to the single frequency network.
The receiver should also support working mode 8~ working mode 10. The performance parameters of this standard are specified according to the mode in Table 2.
Table 2
Working mode carrier number
Forward error correction
Code rate
Symbol constellation
Mapping
Frame header mode
Frame head phase
Variety
Symbol interleaving
Option
Double pilot
insert
Net rate
Mbit/s
1 C=3780 0.4 16QAM PN945 Change 720 - 9.626
2 C=1 0.8 4QAM PN595 - 720 Do not insert 10.396
3 C=3780 0.6 16QAM PN945 Change 720 - 14.438
Table 2 (continued)
Working mode carrier number
Forward error correction
Code rate
Symbol constellation
Mapping
Frame header mode
Frame head phase
Variety
Symbol interleaving
Option
Double pilot
insert
Net rate
Mbit/s
4 C=1 0.8 16QAM PN595 - 720 does not insert 20.791
5 C=3780 0.8 16QAM PN420 Change 720 - 21.658
6 C=3780 0.6 64QAM PN420 Change 720 - 24.365
7 C=1 0.8 32QAM PN595 - 720 does not insert 25.989
8 C=3780 0.8 16QAM PN945 Change 720 - 19.251
9 C=3780 0.6 64QAM PN945 Change 720 - 21.658
10 C=3780 0.8 64QAM PN420 Change 720 - 32.486
5.2.4 RF input port
The receiver shall have at least one RF input that meets the technical requirements of the VHF/UHF band RF input interface in SJ/T 11327-2006.
In port. The port connector impedance is 75Ω and the reflection loss should be greater than or equal to 5dB.
5.2.5 RF Loop Output Port
As an option, the receiver can have a VHF/UHF band RF loop output interface technology in accordance with SJ/T 11327-2006.
Required RF loop output port. The port connector impedance is 75Ω.
The RF signal gain of the loop output should be between -1dB and 3dB. The signal loop output should be independent of the receiver receive status.
5.2.6 C/N performance requirements
The receiver C/N threshold should meet the requirements of working mode 1~ working mode 7 in Table 3, and it is applied to the receiver under single frequency network conditions.
The requirements of working mode 8 to working mode 10 in Table 3 should be met.
table 3
Working mode 1 2 3 4 5 6 7 8 9 10
Gaussian channel (C/N)/dB ≤8.0 ≤6.0 ≤10.7 ≤12.6 ≤13.2 ≤15.7 ≤15.8 ≤13.4 ≤15.9 ≤18.9
Rice channel (C/N)/dB ≤8.7 ≤6.5 ≤11.2 ≤13.3 ≤14.0 ≤16.6 ≤16.6 ≤14.3 ≤16.6 ≤19.8
Rayleigh channel (C/N)/dB ≤10.0 ≤8.4 ≤13.4 ≤16.6 ≤18.0 ≤18.8 ≤20.8 ≤18.3 ≤18.8 ≤24.5
The Rice channel model and the Rayleigh channel model are shown in Appendix C.
5.2.7 Minimum received signal power
The minimum received signal power of the receiver in the receivable frequency range should meet the requirements of working mode 1~ working mode 7 in Table 4.
The receiver applied to the single-frequency network condition should also meet the requirements of the working mode 8 to the working mode 10 in Table 4.
Table 4
Working mode 1 2 3 4 5 6 7 8 9 10
Minimum received signal power
dBm
≤-90 ≤-91 ≤-87 ≤-85 ≤-84 ≤-82 ≤-82 ≤-84 ≤-82 ≤-79
5.2.8 Maximum received signal power
The receiver should work normally when receiving RF signals not less than -10dBm.
5.2.9 Suppress analog TV adjacent channel interference capability
Pre-receives terrestrial digital television signal power and analog television signal power from adjacent channels in case of acceptable error reception
The ratio is C/I. The receiver's ability to suppress adjacent-channel (N±1) analog TV signal interference should meet the working mode 1~ working mode in Table 5.
For the requirements of Equation 7, the receiver applied to the single-frequency network condition should also meet the requirements of the working mode 8 to the working mode 9 in Table 5.
table 5
Working mode 1 2 3 4 5 6 7 8 9 10
(C/I)/dB ≤-46 ≤-44 ≤-45 ≤-41 ≤-42 ≤-41 ≤-40 ≤-42 ≤-41 -
5.2.10 Suppress analog TV co-channel interference capability
Predicting the power of pre-received terrestrial digital television signals and the power of analog television signals from the same channel in the case of acceptable error reception
The ratio is C/I. The receiver's ability to suppress the interference of the same frequency analog TV signal should meet the requirements of the working mode 1~ working mode 7 in Table 6.
The receiver applied to the single-frequency network condition should also meet the requirements of working mode 8~ working mode 9 in Table 6.
Table 6
Working mode 1 2 3 4 5 6 7 8 9 10
(C/I)/dB ≤-14 ≤-14 ≤-10 ≤-5 ≤-3 ≤-4 ≤0 ≤-3 ≤-4 -
5.2.11 Suppressing the ability of digital TV adjacent frequency interference
Pre-receives terrestrial digital television signal power and terrestrial digital television signals from adjacent channels in case of acceptable error reception
The power ratio is C/I. The receiver's ability to suppress the interference of adjacent-frequency digital TV signals should meet the working mode 1~ working mode 7 in Table 7.
The requirements applied to the receiver under single-frequency network conditions should also meet the requirements of working mode 8~ working mode 9 in Table 7.
Table 7
Working mode 1 2 3 4 5 6 7 8 9 10
(C/I)/dB ≤-40 ≤-41 ≤-38 ≤-36 ≤-36 ≤-35 ≤-34 ≤-36 ≤-35 -
5.2.12 Suppressing the ability of digital TV to co-channel interference
Pre-receives terrestrial digital television signal power and terrestrial digital television signals from the same channel in case of acceptable error reception
The power ratio is C/I. The receiver's ability to suppress the interference of the same frequency digital TV signal should meet the working mode 1~ working mode 7 in Table 8.
The requirements applied to the receiver under single-frequency network conditions should also meet the requirements of working mode 8~ working mode 9 in Table 8.
Table 8
Working mode 1 2 3 4 5 6 7 8 9 10
(C/I)/dB ≤8.5 ≤7.0 ≤11.0 ≤13.5 ≤13.5 ≤16.0 ≤16.6 ≤13.8 ≤16.4 -
5.2.13 Suppressing 0dB echo capability
When the receiver receives the two-path static 0dB echo RF signal, the maximum delay of the echo that the receiver should be able to resist should meet the work in Table 9.
The requirements of mode 1~operation mode 7 shall be applied to the receiver under single frequency network conditions and shall also satisfy the working mode 8~ working mode 9 in Table 9.
Claim. When the echo delay is 30μs, the receiver C/N should meet the requirements of the working mode 1~ working mode 7 in Table 9, and apply to the single frequency.
The receiver under the network condition should also meet the requirements of workin...
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