I can understand the merit of a step response and direct read out of = impedance profile. Will it be easy to also include a mode with a sharp pulse instead of = step for an impulse response ? If you have a circuit to generate a 35ps = step, can you use it to generate a 35ps pulse also ? I think there are = steps you can do to convert one to the other but a direct impulse = response is just too good to pass up. Network analyzer on the cheap. Thanks in advanced, Chris ------------------------------------------------------------------ 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 FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org 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