SMA Self-Fixture End-Launch Connectors Johnson / Cinch Connectivity Solutions SMA Self-Fixture End-Launch Connectors overcome the problematic gaps and RF path issues associated with inconsistent soldering processes. These connectors use a proprietary design to accurately align and hold the center contact to the circuit board plane without the need for special fixtures. Special connector legs tightly grip the center contact to the circuit board plane through the complete soldering process, allowing for consistent soldering work on a variety of PCB thicknesses. These connectors also eliminate poor connections that degrade signal quality.