I was asked this the other day and my first gut reaction was..no, shouldnt be. For a BNC coupler, is there a 50 and 75 ohm version? Or is it just a coupler so the impedance should be zero or close to it, since its coupling an impedance matched connector system. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist