Greetings, I'm designing a high speed digital connector and to meet some mechanical requirements I am looking at a pin made of an iron alloy with gold plating. The gold plating will get me the required contact physics properties for durability, contact resistance, etc. but I got to thinking about the iron alloy base material. The self partial inductance of the contact will increase due to the permeability but the loop inductance won't change (compared to a non ferrous base material). And the capacitive coupling should not be affected at all as that is driven by the potential distribution in the pin field. In short, I don't think the SI characteristics of the connector are affected much by the use of a ferrous base material in the signal pin. I am not looking at this as a self equalized connector - the length is only 0.5". And it's not an RF connector where intermod distortion is an issue. That said - I figured I would get the collective input from the group, I could use some unbiased feedback here... Thanks in advance. Jim Nadolny ------------------------------------------------------------------ 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 technical documents are available at: http://www.si-list.net 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