EN 4652-310:2015

Overview

EN 4652-310:2015 is a European standard developed by CEN, focusing on aerospace-grade coaxial connectors with N-type interfaces. Specifically, it covers Type 3, clamp nut assembly version, straight plugs designed for radio frequency (RF) applications in aerospace systems. This standard defines the technical specifications, mechanical design, electrical performance, and environmental compliance requirements for 50 ohm coaxial straight plugs that use clamp technology to attach cables securely.

This standard ensures interoperability, reliability, and safety of RF connectors in harsh aerospace environments by specifying detailed test methods and quality assurance procedures. EN 4652-310:2015 is part of the broader Aerospace series dedicated to high-frequency connectors used in avionics, defense systems, and communication equipment.

Key Topics

• Scope and Application
  Specifies characteristics of screwed-on coupling straight plugs with N interface for 50 Ω impedance cables, assembled using clamp nut technology.

• Mechanical and Dimensional Requirements
  Includes precise dimensions, mass limits, and configuration details critical to ensure compatibility and secure fitting. Examples include overall length, hex sizes, and presence of lockwire holes or self-locking devices.

• Materials and Finish
  Details on materials such as gold-plated copper alloy contacts, PTFE insulators, silicone rubber sealings, and nickel-plated bodies to guarantee durability, corrosion resistance, and electrical performance under aerospace conditions.

• Electrical Specifications

  • Impedance: 50 Ω
  • Max operating frequency: 6 GHz
  • Voltage withstand: 1,500 V effective at sea level
  • Insertion loss and VSWR thresholds to minimize signal attenuation and reflection
  • High insulation resistance (≥ 5,000 MΩ)

• Environmental and Mechanical Testing
  Comprehensive test methods address:

  • Salt mist, sand and dust resistance
  • Thermal cycling between –65 °C and 165 °C
  • Vibration and shock durability
  • Water ingress resistance in mated and unmated conditions
  • Voltage standing wave ratio (VSWR) and insertion loss measurements

• Assembly and Cable Compatibility
  Defines permissible cable groups, stripping lengths, and retention forces necessary for reliable electrical and mechanical connections.

• Quality Assurance and Qualification
  Refers to aerospace quality management standards and outlines rigorous qualification programs to ensure connector reliability over 500 mating cycles.

• Marking, Packaging, and Storage
  Provides guidelines to ensure traceability, packaging protection, and storage conditions that maintain product integrity.

Applications

EN 4652-310:2015 connectors are extensively applied in:

• Aerospace and Defense Systems
  Ensuring high-performance RF signal transmission in aircraft, satellites, and military equipment.

• Avionics Communication Lines
  Providing secure, low-loss connections between critical avionics modules.

• Radio Frequency Transmission
  Supporting radar, navigation, and communication antennas where reliable impedance matching is essential.

• Harsh Environment Installations
  Protecting against extreme temperatures, mechanical vibrations, moisture, and contaminants typical of aerospace conditions.

• Test and Measurement Equipment
  Standardized connectors facilitate consistent measurements across aerospace RF testing setups.

Related Standards

• EN 4652-001 - Technical specifications for coaxial RF connectors, forming the base framework for this product-specific standard.

• EN 4652-312 and EN 4652-313 - Complementary standards covering square flange and bulkhead receptacle variants utilizing similar clamp nut assembly technology.

• EN 2591 - Aerospace test methods for electrical and optical connections referenced to validate connector performance.

• EN 2812 - Cable stripping methods critical for correct cable preparation.

• EN 9133 - Quality management systems tailored for aerospace standard parts qualification.

• TR 6058 - Cable code identification list used to specify compatible cable groups.

Conclusion

EN 4652-310:2015 is essential for manufacturers, designers, and quality engineers involved in aerospace RF system integration. It provides a robust framework to ensure that coaxial connectors meet stringent aerospace requirements for performance, reliability, and environmental resistance. Using this standard promotes interoperability and safety in critical aerospace communication infrastructures, helping reduce failures and maintenance costs while optimizing signal integrity.

Keywords: aerospace connectors, coaxial connectors, N interface, straight plug, clamp nut assembly, 50 ohm, radio frequency connectors, EN 4652-310, aerospace RF standards, high-frequency connectors, aviation cable connectors