IEC 61169-4:2008

Overview - IEC 61169-4:2008 (type 7-16, 50 Ω)

IEC 61169-4:2008 is the sectional specification for RF coaxial connectors type 7-16 (inner diameter of outer conductor 16 mm, screw lock) with characteristic impedance 50 Ω. The standard defines interface dimensions, gauging requirements and mandatory test selections for preparing Detail Specifications (DS). It targets middle-power applications using 50 Ω flexible and semi‑rigid RF cables and supports accurate measurement and interchangeability up to an operating frequency of 7.5 GHz.

Key facts:

• Connector family: 7-16 screw-lock
• Outer conductor inner diameter: 16 mm (0.63 in)
• Thread: M29×1.5 (metric)
• Characteristic impedance: 50 Ω
• Grades: Grade 2 (general purpose) and Grade 0 (standard test connector)
• Includes gauging and mandatory tests drawn from QC 22000 (IEC 61169-1)

Key topics and technical requirements

• Interface dimensions - Detailed dimensional tables for connectors with pin and socket centre contacts (grade 2), plus tighter tolerances for standard test connectors (grade 0) to ensure impedance accuracy.
• Gauging & retention tests - Gauge pin and ring specifications, required insertion/retention forces (e.g., centre-contact retention and gauge ring retention), and push-on force limits (examples in the standard: retention force requirements and maximum push-on force).
• Test connectors and measurement accuracy - Standard test connector tolerances that guarantee characteristic impedance accuracy (document cites an accuracy target of ±0.75 Ω for reflection coefficient measurements).
• Quality assessment & test schedules - Mandatory acceptance and periodic tests, inspection procedures and selection guidance from QC 22000 (IEC 61169-1).
• Preparation of Detail Specifications (DS) - Guidance, pro‑forma and recommended performance characteristics for suppliers and purchasers.

Applications and who uses IEC 61169-4

Practical uses:

• Design, manufacture and acceptance testing of 7-16 RF coaxial connectors for telecom base stations, broadcast equipment, antenna systems, microwave links and test-equipment interfaces.
• Specification and procurement of connector components and cable assemblies where mechanical robustness and controlled impedance are critical.
• Calibration labs and test houses using standard test connectors to perform reliable reflection coefficient and intermodulation measurements.

Typical users:

• RF/microwave component manufacturers
• Test and calibration laboratories
• System integrators and procurement engineers in telecommunications and broadcast
• Standards writers and quality engineers preparing Detail Specifications

Related standards

• IEC 61169-1 - Generic specification: general requirements and measuring methods (normative reference used for tests and QC 22000 selection).
• IEC 62037 - RF intermodulation level measurement for connectors and cable assemblies.
• Other parts of the IEC 61169 series covering different RF connector types.

Keywords: IEC 61169-4, 7-16 connector, type 7-16, RF coaxial connector, 50 Ω, screw lock, interface dimensions, gauge, standard test connector, characteristic impedance, test schedule, quality assessment.