This part of GB/T 17737 covers the requirements for leaky cable. It specifies preferred ratings and characteristics for leaky cable (hereinafter referred to as "cable") and enables selection of the appropriate tests and performance levels from the generic specification for inclusion in the detail specification.
This part is applicable to leaky cables for radio mobile communication system, wireless remote control system and radio warning system etc.
Note 1: The coupling intensity between cable and mobile equipment depends on:
——construction of the cable;
——characteristics of antenna (e.g., gain and orientation etc.);
——distance and orientation of the mobile antenna from the cable;
——types of ambient atmosphere;
——operating frequency range;
——manner of installation of the cable;
——shape, material and dimension of surrounding buildings.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 2421.1-2008 Environmental Testing - General and Guidance (IEC 60068-1: 1988, IDT)
GB/T 2951.11-2008 Common Test Methods for Insulating and Sheathing Materials of Electric and Optical Cables - Part 11: Methods for General Application - Measurement of Thickness and Overall Dimensions - Tests for Determining the Mechanical Properties (IEC 60811-1-1: 2001, IDT)
GB/T 8358 Method of Breaking Tensile Test for Steel Wire Ropes
GB/T 17650 (all parts) Tests on Gases Evolved during Combustion of Materials from Cables [IEC 60754 (all parts)]
GB/T 17651 (all parts) Measurement of Smoke Density of Cables Burning under Defined Conditions [IEC 61034(all parts)]
GB/T 17737.1-2013 Coaxial Communication Cables - Part 1: Generic Specification - General, Definitions and Requirements (IEC 61196-1: 2005, IDT)
GB/T 18380 (all parts) Test on Electric and Optical Fibre Cables under Fire Conditions [IEC 60332(all parts)]
IEC 60068-2-1 Environmental Testing - Part 2-1: Tests - Test A: Cold
IEC 60068-2-2 Environmental Testing - Part 2-1: Tests - Test B: Dry Heat
IEC 61196-1-1 Coaxial Communication Cables - Part 1-1: Capability Approval for Coaxial Cables
IEC 61196-1-102 Coaxial Communication Cables - Part 1-102 Electrical Test Methods - Test for Insulation Resistance of Cable Dielectric
IEC 61196-1-105 Coaxial Communication Cables - Part 1-105 Electrical Test Methods - Test for Withstand Voltage of Cable Dielectric
IEC 61196-1-108 Coaxial Communication Cables - Part 1-108 Electrical Test Methods - Test for Characteristic Impedance, Phase and Group Delay, Electrical Length and Propagation Velocity
IEC 61196-1-112 Coaxial Communication Cables - Part 1-112 Electrical Test Methods - Test for Return Loss (Uniformity of Impedance)
IEC 61196-1-314 Coaxial Communication Cables - Part 1-314 Mechanical Test Methods - Test for Bending
IEC 61196-1-316 Coaxial Communication Cables - Part 1-316 Mechanical Test Methods - Test for Maximum Pulling Force of Cable
3 Terms and Definitions
For the purposes of this standard, the terms and definitions given in GB/T 17737.1 and the following apply.
3.1
Leaky (coaxial) cable
Coaxial communication cables with outer conductors that are intentionally not completely closed, so that part of the energy transmitted or received through the cable is coupled by or radiated to the transmission system formed by the outer conductor of the cable and the external environment.
