A spreadsheet to aid in Tpd calculations authored by Abe Riazi of ServerWorks has been uploaded to the si-list file archives and is available for download at the following URL: http://groups.yahoo.com/group/si-list/files/Technical%20Documents/ (go to the URL and click on the link labeled: "Tpd spreadsheet rev1 0.xls" The file was uploaded in support of the recent discussion thread on determining dielectric constants in substrate materials. The thread title was/is: 'Finding Er (Permitivity)' -Ray Anderson (si-list admin) ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu