Hello Scuba, Scuba Snail> To make a long story short - we used a 50 mils basic building block W Scuba Snail> element, and we construct any other length recursively from it. Scuba Snail> A 5 inch trace takes roughly 30 to 40 minutes of accurate run, and it differ Scuba Snail> plus minus 20 pSec from the "base line". thanks your help !!! using 50mil as the "base line" , i have to simulate a 70mm trace plus the driver and receive buffer , so i dont know the result should have any meaning ?? -- Best regards, qzheng mailto:qzheng@xxxxxxxxxxxxxxxx ------------------------------------------------------------------ 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