These connector series offer three different coupling mechanisms smb has a snap on coupling allowing quick but secure connection and is usable up to 4 ghz smc has a threaded coupling for vibration proof installation and is usable up to 10 ghz sms has a slide coupling which is suitable for rack and panel systems and is usable up to 4 ghzthe impedance is controlled at 50 for all types connector styles are available for flexible conformable and semi rigid cables versions of these series