RF engineers measure the effectiveness of a controlled impedance line most often by sweeping a circuit out to a certain frequency with a network analyzer. PWB houses measure controlled impedance lines with TDRs. What is the best way to specify controlled impedance line testing on a drawing to satisfy both parties? Just spec the rise time for the TDR? Is there a better way? Regards, John R. Kretsch, P.E. Sr. Engineer, Design Assurance ADC Broadband Communications *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * ***************************************************************************