Are you measuring according to DA 00-705? That should help. Bob Heller 3M EMC Laboratory, 76-1-01 St. Paul, MN 55107-1208 Tel: 651-778-6336 Fax: 651-778-6252 =================================
From: "Pawson, James" <[email protected]> To: "'Grace Lin'" <[email protected]> Cc: "[email protected]" <[email protected]> Date: 02/15/2012 07:03 AM Subject: RE: FCC - Intentional Radiators, Restricted Bands and 960 MHz Sent by: [email protected] Hi Grace, That's a very useful document for measuring the RF path, thanks for the info. The issue we have is that the RF path is not the only path for the emissions at 960MHz from the equipment under test so measuring just the conducted output into the antenna would not give the whole picture. Thanks James From: Grace Lin [mailto:[email protected]] Sent: 15 February 2012 12:42 To: Pawson, James Cc: [email protected] Subject: Re: FCC - Intentional Radiators, Restricted Bands and 960 MHz James, FCC published a new DTS procedure, FCC KDB 558074 D01 DTS Meas Guidance v01 , on January 18, 2012. If you are able to connect the antenna port of the device under test to the instrument (spectrum analyzer, through attenuators if needed), you may wish to use this procedure. FCC has done a great job on this procedure (save engineers' time and have better repeatability). If you need a sample test report using the FCC DTS procedure, DTS Measurement , published March 23, 2005, you may wish to look the report under FCC ID: EROCWD6660 or FCC ID: EROCWD6782. These two applications were granted by the FCC. Conducted measurement was used to take -20dBc data (screen captures). With regards, Grace Lin On Wed, Feb 15, 2012 at 5:46 AM, Pawson, James <[email protected]> wrote: Bit of a regulatory puzzler here, please bear with me. Testing an intentional radiator to FCC 15.247. Spurious emissions allowed to be -20 dBc except in the 15.205 restricted bands where the general radiated emissions limits in 15.209. Radiated emissions limits: 216 ~ 960 MHz = 200 uV/m, 960 MHz upwards = 500 uV/m The tighter (lower) limit applies at the band edges so at 960 MHz the limit is 200 uV/m Restricted Bands includes 960 MHz to 1240 MHz I've drawn a picture to help explain -- http://thedatastream.4hv.org/data/fcc_15-247_960mhz_limit_line_question.gif My question is - what is the limit at 960 MHz for spurious emissions from an intentional radiator? My interpretation (to the letter of part 15) is that for 960 MHz only, the limit is 200 uV/m. However this doesn't follow a common sense approach to the limits and restricted bands (the green limit line on the picture). We currently have an issue with a product with emissions around 960 MHz that would cause it to fail the strict interpretation of the standard but pass the "common sense approach" interpretation. So any assistance is greatly appreciated :) Thanks in advance James ~~~~~~~~~~~~~~~~~~~~ James Pawson Leading Hardware Engineer - EMC EchoStar Europe ~~~~~~~~~~~~~~~~~~~~ - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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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.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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]>
