The bending radius of the pigtail should not be too small
The bending radius of a pigtail should not be less than 10 times the cable's outer diameter for coaxial cables and at least 30 mm for fiber optic pigtails.
Fiber Optic Pigtails
For fiber optic pigtails, the minimum bend radius is critical to prevent signal loss and mechanical damage. According to standards, the fiber core and pigtail should have a bend radius of at least 30 mm, while fibers not sensitive to macro-bending loss can tolerate a minimum of 15 mm . During installation, the introduced optical cable should maintain a bend radius of no less than 15 times the cable diameter to ensure long-term performance .
Coaxial Pigtails
For coaxial cables such as RG316, a safe engineering rule is to maintain a minimum bend radius of approximately 10 times the cable's outer diameter. For example, an RG316 cable with a 2.5 mm outer diameter should have a minimum bend radius of 25 mm. Bending tighter than this, especially near the connector boot, can significantly shorten the cable's mechanical life and increase insertion loss .
General Guidelines
- During installation under tension: Fiber optic cables require a larger bend radius, typically 20 times the cable's outer diameter, to avoid stress and potential damage .
- Post-installation: A smaller bend radius, around 10 times the cable's outer diameter, is acceptable for long-term use .
- Avoid sharp bends near connectors or boots, as these areas experience the highest strain and are prone to micro-cracks or insulation damage . Maintaining the recommended bend radius ensures signal integrity, mechanical reliability, and longevity of both fiber optic and coaxial pigtails.
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