I am looking to see if anyone has the calculations for " Dual Stripline " controlled impedance in a spreadsheet type of formula. I have all the others, but this particular type has just reared it's ugly head, and we haven't done this board type before. I am just trying to make sure that my calculations, and lay-ups are accurate. Keep in mind I'm not a Math Wizard, hence the need for the spreadsheet type of format. Any help will be deeply appreciated. If what you have is not proprietary e-mail to [log in to unmask] with any help or files. Again, thanks in advance. Ernie Smith Electropac Co. Inc. ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################