I haven't done it in long time, but NSA measurement is esentially insertion loss measurement between two antennas. So you calibrate "through" at the feed points of your both antennas (this calibrates out the cable) and measure S21.
VNAs that I know don't have "max hold" function so you may need SW to capture data for all antenna heights and merge them to obtain max values. Alternatively, you could use a spectrum analyzer with tracking generator instead of the VNA. You do one calibration "through" measurement though the cables and store it in one trace. Then connect the antennas and use another trace for antenna insertion-loss measurement. Then calculate meas/reference (usualy available on the SA) to take out the cable loss from your measurement. The rest is massaging the numbers. Neven > > -----Original Message----- > From: Derek Walton [mailto:[email protected]] > Sent: Sunday, April 04, 2004 10:37 PM > To: [email protected] > Subject: VNA's for NSA > > > Hi All, > > I'm looking at using a VNA to perform NSA measurements. > > Can anyone direct me to a detailed procedure? > > Thanks, > -- > Derek N. Walton > L F Research > Poplar Grove, IL 61065, USA > > > > The NSA is a bit tight about handing out procedures detailing TEMPEST or > COMSEC testing. You should go back to your contracting officer for guidance. > If you want, I can put you in touch with a Navy TEMPEST contact who does > field testing and could provide you with more authoritative advice. > > Regards, > > Ed > > Ed Price > [email protected] WB6WSN > NARTE Certified EMC Engineer & Technician > Electromagnetic Compatibility Lab > Cubic Defense Applications > San Diego, CA USA > 858-505-2780 (Voice) > 858-505-1583 (Fax) > Military & Avionics EMC Is Our Specialty > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ieee-pses.org/ > > To cancel your subscription, send mail to: > [email protected] > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Ron Pickard: [email protected] > Dave Heald: [email protected] > > For policy questions, send mail to: > Richard Nute: [email protected] > Jim Bacher: [email protected] > > All emc-pstc postings are archived and searchable on the web at: > http://www.ieeecommunities.org/emc-pstc This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ieee-pses.org/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
