Hi Mark, VNA calibration is quite flexible, but it's important to know which type = of error correction to use at the right time. Understanding = de-embedding, port rotation, time domain gating, SOLT, TRL, LRM, = normalization and a host of others can be a daunting task. We just = finished a good app note on this subject called, " Signal Integrity = Analysis Series Part 3: The ABCs of De-Embedding". To check it out, go = here: http://www.home.agilent.com/agilent/redirector.jspx?action=3Dref&cname=3D= AGILENT_EDITORIAL&ckey=3D1224306&lc=3Deng&cc=3DUS I hope this helps. Regards, Mike Mike Resso Product Manager Signal Integrity Applications Component Test Division Agilent Technologies 1400 Fountaingrove Pkwy. Mail Stop 3USG Santa Rosa, Ca. 95403 707-577-6529=20 =20 =20 -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] = On Behalf Of Mark Randol Sent: Monday, July 30, 2007 12:37 PM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Re: Port Extension Algorithm Port extensions simply add in an amount of electrical length that the user specifies. The phase is mathematically 'un-wound' over frequency based on that setting. No losses or other problems are accounted for. The assumption is a 'perfect Zo transmission line of electrical length x'. Oftentimes it is plenty good enough. If you need more than that, you need to de-embed the structure in question with data from either simulation or measurements. -- Mark Randol, RF Evaluation & Application Engineer ON Semiconductor 901 S. Mopac Expressway Barton Oaks 4, Suite 343 Austin, TX 78746 512-329-5640 (voice), 512-329-8151 (FAX) =3D20 =3D20 > -----Original Message----- > From: si-list-bounce@xxxxxxxxxxxxx=3D20 > [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of=3D20 > codymiller@xxxxxxxxxx > Sent: Monday, July 30, 2007 2:23 PM > To: si-list@xxxxxxxxxxxxx > Subject: [SI-LIST] Port Extension Algorithm >=3D20 > I would like to understand the algorithm used when the port=3D20 > extension mode is used on a VNA. I have some S11 data that=3D20 > was previously taken and would like to apply a port extension=3D20 > to it. Any thoughts? >=3D20 > Thanks, > Cody Miller ------------------------------------------------------------------ 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: =20 //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 =20 ------------------------------------------------------------------ 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