Installation Tips for Double Shielded Coax Cable

Double shielded coax cable, which offers enhanced protection against electromagnetic interference (EMI) and radio frequency interference (RFI), is a crucial component for high-quality signal transmission. Its installation requires meticulous attention to ensure optimal performance and longevity. This article provides comprehensive guidelines to assist with the proper installation of double shielded coax cable.

Site Preparation

Before installing the cable, conduct a thorough site survey to identify potential sources of EMI and RFI. Consider the proximity of electrical equipment, fluorescent lighting, and other cables that may generate interference. Choose a protected path for the cable to minimize exposure to external noise.

Cable Selection

Select double shielded coax cable with the appropriate impedance for the application. Common impedances include 50 ohms, 75 ohms, and 93 ohms. Choose a cable with a suitable outer diameter and flexibility to accommodate the installation environment. Consider the cable’s shielding effectiveness and bandwidth requirements.

Installation Methods

Double shielded coax cable can be installed using various methods, including aerial suspension, conduit installation, and underground burial. Aerial suspension involves suspending the cable from poles or support structures. Conduit installation protects the cable from the elements and physical damage. Underground burial requires digging a trench and burying the cable with proper protection.

Termination

Proper termination is essential for maintaining the cable’s shielding effectiveness. Use high-quality connectors that are compatible with the cable’s impedance and outer diameter. Ensure that the connectors are properly crimped or soldered to avoid signal loss. Trim the cable jacket precisely and dress the shield braid to prevent shorts.

Grounding

Double shielded coax cable should be properly grounded to drain off static electricity and EMI. Ground the cable at both ends, using a grounding block or rod. The grounding connections should be secure and made with appropriate wire gauge.

Bend Radius

Avoid bending the cable below its minimum bend radius, which is typically specified by the manufacturer. Excessive bending can damage the cable’s shielding and compromise its performance. Use bend supporters or gradual bends to maintain the cable’s integrity.

Cable Management

Organize and bundle the cables neatly to prevent tangles and interference. Use cable ties or Velcro straps to secure the cables to supports or structures. Keep the cables away from sharp edges or moving parts that could damage them.

Testing and Troubleshooting

After installation, test the cable to ensure proper functionality. Use a cable tester to check for continuity, shorts, and opens. Inspect the connectors and grounding connections for any issues. If problems arise, identify the source of the malfunction and make necessary repairs or adjustments.