re-think the whole data collection process. Scan for awhile, a portion of the spectrum with no regard to azimuth yet, Identify the frequencies with the highest levels, a list. Set one to the center freq, set scan rate to equal turntable rate, scan azimuth plot. Adjust turntable speed if needed to ~match scan rates. Repeat for list. That scan runs slow and can be matched with azimuth data. Now you have Freq and level and azimuth data; scan for height at each. I have found, as in beat over my head and shoulders, that one slow scan has better data than multiple fast scans. Match your scans to your data rate, and keep some magazines around for long stretches of watching the little glowing dot move ever so slowly across the screen - once. - Bill In the event of a national emergency, click on the following links to provide directions to your duly elected mis-representative.
http://www.usa.gov/Contact/Elected.shtml or... https://writerep.house.gov/writerep/welcome.shtml http://www.senate.gov/general/contact_information/senators_cfm.cfm ________________________________ From: "Kunde, Brian" <brian_ku...@lecotc.com> To: "emc-p...@ieee.org" <emc-p...@ieee.org> Sent: Tue, March 30, 2010 9:03:51 AM Subject: Receiver Recommendations We are looking to replace our old HP 8546A receiver and looking for any recommendations. We use this receiver to run semi-automated Radiated Emissions scans in a 10 meter semi-anechoic chamber up to 6Ghz. We also will use this for Line Conducted scans. Our biggest concern with a replacement receiver is when we are performing a Peak Scan we have to match up sweep data from the receiver with the turntable position. Currently with the turntable moving, we sweep the receiver, download the data into a computer, then read the turntable position and keep track of the position of the highest signal at each frequency. We have to be able to do this very fast to get data at small turntable angle intervals. Currently we can download sweeps faster than 1 per second. We have looked at a few of the new digital and time-domain receivers but they seem to be way to slow at scanning and downloading data to a computer. They seem to take too much time thinking before displaying their data. This type of receiver won’t work in place of our current receiver and method of testing unless there is a way to speed them up. For those of you who do similar type of scans with your receiver, what recommendations do you have? If we have to change our test method to accommodate the newer receivers, what test method do you recommend? Please note that the new receivers we have seen were demo units operated by salesmen who were not able to get them to operate fast enough for our current need. We might be able to speed the receiver up by reducing the number of data points per sweep. One receiver we looked at only had a USB port interface and I don’t think that will be fast enough to transfer data in real time to our computer. I’m hoping there will be at least a few out there in IEEE land who can pass on some recommendations. We would like to find a good quality accurate receiver that will do what we need it to do and at a reasonable price. Does such exist? Thank you in advance. The Other Brian _________________________ LECO Corporation Notice: This communication may contain confidential information intended for the named recipient(s) only. If you received this by mistake, please destroy it and notify us of the error. Thank you. - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <emcp...@socal.rr.com> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org> David Heald <dhe...@gmail.com> - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <emcp...@socal.rr.com> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org> David Heald <dhe...@gmail.com> - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <emcp...@socal.rr.com> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org> David Heald <dhe...@gmail.com>
