Hirose U.FL Cable Assembly Jumper Compatibles Using Micro-Coax Snap-On UMCX Connectors We introduced a new line of Hirose U.FL™ compatible cable assembly jumpers which Pasternack calls UMCX. These U.FL cable compatible UMCX products are ultra-miniature coaxial cable assemblies. Our UMCX Hirose U.FL coaxial cable assembly jumper compatible product line operate from DC to 6 GHz. ..