This standard specifies the technical requirements and measurement methods for terrestrial digital television broadcasting single frequency network adapters that comply with GB 20600-2006. Any equivalent measurement method that can ensure the same measurement uncertainty can also be used. In case of dispute, this standard shall prevail. This standard applies to the design, production, acceptance, use, operation, and maintenance of VHF.UHF terrestrial digital television broadcasting single frequency network adapters. The following normative references are essential for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest version (including all modification orders) applies to this document. GB/T 6113.101-2008 Specification for Radio Disturbance and Immunity Measurement Equipment and Measurement Methods - Part 1-1: Radio Disturbance and Immunity Measurement Equipment - GB 9254-2008 Radio Disturbance Limits and Measurement Methods for Information Technology Equipment - GB 17625.1-2003 Electromagnetic Compatibility and Limits - Harmonic Current Emission Limits (Input Current per Phase of Equipment ≤ 16 A) GB 17625.2-2007 Electromagnetic Compatibility, Limits, Voltage Changes Generated by Equipment with a Rated Current of ≤ 16A per Phase and Unconditional Access in Public Low Voltage Power Supply Systems Limitations of Voltage Fluctuations and Flashing GB/T 17626.2-2006 Electromagnetic Compatibility, Testing and Measurement Techniques, Electrostatic Discharge Immunity Test GB/T 17626.3-2006 Electromagnetic Compatibility, Testing and Measurement Techniques, Radio Frequency Electromagnetic Field Radiation Immunity Test GB/T 17626.4-2008 Electromagnetic Compatibility, Testing and Measurement Techniques, Electrical Fast Transient Pulse Group Immunity Test GB/T 17626.5-2008 Electromagnetic Compatibility, Testing and Measurement Techniques, Surge (Impulse) Immunity Test GB/T 17626.6-2008 Electromagnetic Compatibility, Testing and Measurement Techniques, Conducted Disturbance Immunity Induced by RF Fields GB/T 17626.11-2008 Electromagnetic Compatibility, Testing and Measurement Techniques, Immunity Test for Voltage Dips, Short Interruptions, and Voltage Variations GB/T 17975.1-2010 Information Technology, General Coding of Moving Images and Associated Sound Information - Part 1; System GB 20600-2006 Digital Television Terrestrial Broadcasting Transmission System Frame Structure, Channel Coding and Modulation 3 Terms, Definitions and Abbreviations 3.1 Terms and Definitions The following terms and definitions apply to this document. 3.1.1 Single frequency network is a terrestrial digital television coverage network composed of multiple transmitters located in different locations and in a synchronized state. Each transmitter in the network emits the same modulated RF signal at the same frequency and time to achieve reliable coverage of a specific service area
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