what is everyone using to do controlled impedance calculations.. i have looked at polaris's product, but i am guessing it's gonna be expensive.. i am currently setting up a spreadsheet in excel, after playing the the formulas in mathematica... i am just using the formulas i found in ipc-2221.. and have not done much fiddling with anything yet.. awaiting a set of test coupons to see how close i am... thanks in advance... ____ Sergio T. Ruiz Sales and MIS Philway Products, Inc. (419) 281-7777 x228 --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------