Troubleshooting SDI Signal Issues
Diagnose SDI signal problems including no signal, dropouts, and error detection with Magewell SDI capture devices.
The Problem
SDI capture shows no signal, intermittent dropouts, or degraded video quality.
The Solution
Check BNC cable connections, verify SDI format compatibility (SD/HD/3G/6G/12G), and test cable integrity. SDI cables support longer runs than HDMI but still have distance limits based on format.
Step-by-Step Instructions
Verify BNC connectors are firmly locked (twist clockwise until seated)
Check SDI format: SD-SDI (270Mbps), HD-SDI (1.485Gbps), 3G-SDI (2.97Gbps)
Test with known-good SDI cable
Verify your capture device supports the SDI format in use
Check cable length: HD-SDI reliable to 100m, 3G-SDI to 70m with quality cable
Use SDI signal generator or camera test pattern to isolate cable vs source issues
Inspect BNC connectors for damage or corrosion
For long runs: Use SDI distribution amplifier or fiber converter
Pro Tips
- SDI has no HDCP - all content can be captured freely
- 75-ohm BNC cables required - do not use 50-ohm networking cables
- SDI supports embedded audio - no separate audio cable needed
- Locking BNC connectors prevent accidental disconnection in production environments
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