Charles, the Agilent VNA's perform a set of single-ended S Parameter measurements and then perform matrix transformations to derive the mixed-mode values algebraically. BTW, you will make your life a bit easier if in your test set-ups you adopt Agilent's default port convention of: P1 <=> P2 P3 <=> P4 Best Regards, Steve. On 4/4/2011 1:20 PM, Grasso, Charles wrote: > Hello all, > I have a question on how the SDD and SCD series of measurements are made. > Never having actually > performed these measurements I did a bit of reading and am unclear on the > process. What I understand is > (at least from one manufacturer of test equipment) that the 4 x 4 > single-ended S-parameters (S11 to S44) > are measured. A built-in function then converts them to the mixed mode > S-parameters. > > My question: For SDD11 are the trace pairs driven with a differential signal > (in the software?). > By the same token for the SDC measurements are the traces driven with a > common signal? > > Thanks! > Best Regards > Charles Grasso > Compliance Engineer > Echostar Communications > (w) 303-706-5467 > (c) 303-204-2974 > (t) 3032042974@xxxxxxxxx<mailto:3032042974@xxxxxxxxx> > (e) charles.grasso@xxxxxxxxxxxx<mailto:charles.grasso@xxxxxxxxxxxx> > (e2) chasgrasso@xxxxxxxxx<mailto:chasgrasso@xxxxxxxxx> > > > ------------------------------------------------------------------ > 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 > > Old (prior to June 6, 2001) list archives are viewable at: > http://www.qsl.net/wb6tpu > > > -- Steve Weir IPBLOX, LLC 150 N. Center St. #211 Reno, NV 89501 www.ipblox.com (775) 299-4236 Business (866) 675-4630 Toll-free (707) 780-1951 Fax ------------------------------------------------------------------ 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 Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu