FS59U Connectors provide a connector-based compression while not exerting pressure on the center dielectric which allows the coaxial cable to maintain its rated impedance -- a distorted dielectric will disrupt a cable's impedance rating. These connectors form "o-rings" from the cable's jacket providing a water-tight, powerful connection that will provide more reliability than a standard crimp. All of the FS59U connectors insure proper connections to the center conductor by loading the pin (when applicable) at the back connector, or having a separate pin, rather than pre-installing the pin like most competition -- this allows you to insert the center conductor into the pin before the final assembly.
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