Hello Grace,
The first question is – what do you mean by a site comparison? If by that you mean how well a site performs to established site attenuation – well then all you need is to have the site run the test. If, by site comparison, you mean comparing one site against another then you actually have a more difficult problem as there are several variables that you will need to account for. What has proved very successful is to use a standard calibrated source and provide the test lab with a detailed set of instructions on how to take the measurement. This methodology focuses on the site quality only! (Dell and HP are examples) NIST has a very precise site source (the original design was done by Galen Koepke from NIST I believe) HP developed their own source and reported that they reduced site to site variability to about 2dB!! I cannot remember the individual that designed the source and did the work maybe someone from this list can help! Best Regards Charles Grasso Compliance Engineer Echostar Communications (w) 303-706-5467 (c) 303-204-2974 (t) [email protected] <mailto:[email protected]> (e) [email protected] <mailto:[email protected]> (e2) [email protected] <mailto:[email protected]> ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Friday, November 20, 2009 11:06 AM To: [email protected] Subject: Re: [PSES] 3-meter Chamber Site Comparison If you can spare time why not try both an EUT and a 'comb' RF source? It would make a nice cross-check. _______________________________________ _____________________________________________ Ralph McDiarmid | Schneider Electric | Renewable Energies Business | CANADA | From: Grace Lin <[email protected]> To: [email protected] List-Post: [email protected] List-Post: [email protected] List-Post: [email protected] Date: 11/20/2009 04:56 AM Subject: [PSES] 3-meter Chamber Site Comparison ________________________________ Dear Members, I am asked to perform site comparison and would like to hear your comments. Should I purchase a signal source? If yes, do you have any reference? I do have a COM-POWER comb generator and don't know if it is good enough for the purpose. Should I use an EUT for site comparison? Thank you. Best regards, Grace Lin - 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 <[email protected]> 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 <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher <[email protected]> David Heald <[email protected]> ________________________________________________________________________ This email has been scanned for SPAM content and Viruses by the MessageL abs Email Security System. ________________________________________________________________________ - 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 <[email protected]> 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 <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher <[email protected]> David Heald <[email protected]> - 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 <[email protected]> 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 <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher <[email protected]> David Heald <[email protected]>
