Hello ! I've been asked, by one of our engineers, about controlled impedance boards. I'm new to this and was unable to give him any "good" information. I knew, however, that I'd be able to obtain this information from all of you ! ;) First of all, are there and specs that will help with the design of a controlled impedance board ? Are there specs that a board fabricator will need to be aware of ? Am I correct in saying that we (layout designers) and the fabricators are going to need to work closely ? Any help would be appreciated. Thanks in advance Lou Takach Union Switch & Signal Inc. 412.688.2574 (voice) 412.688.2396 Wait for the tone then enter 2574# and hit [send]. The extra 4 digits direct the fax directly to my email account [log in to unmask] *************************************************************************** * 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. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************