F1CBC

Why Minor Details Determine Success in High-Frequency Connectivity In RF engineering, everything is a trade-off. This morning, I reviewed a custom cable assembly for a UAV telemetry link. The customer was concerned about signal drop-outs at 5.8 GHz. Many would have suggested swapping out the cable. But we looked deeper—into the connector interface. A poorly seated PTFE insulator or a slight misalignment in the center contact can create an impedance mismatch that no software algorithm can fix. By holding a mechanical tolerance of ±0.02 mm and using high-purity brass with a controlled plating thickness, we stabilized the VSWR and kept the project on track. After 10+ years in this industry, one thing is clear: the signal doesn’t lie. Quality lives in the microns. To my fellow RF FAEs and developers—what’s the strangest signal issue you’ve ever traced back to a physical connector?