James looking at your picture: >Is that what the 15.247 limit should do Yes - the limit line is essentially castellated between your -20dBc and the applicable level in 15.209(a). The 200dBuV/m limit doesn't apply to your equipment below the 960MHz transition point - the -20dBc limit does.
As an aside, make sure that all your other measurements are to latest test method detailed in KDB 558074-d01 issued last month. Regards Charlie From: Pawson, James [mailto:james.paw...@echostar.com] Sent: 15 February 2012 10:47 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] FCC - Intentional Radiators, Restricted Bands and 960 MHz 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. To post a message to the list, send your e-mail to <emc-p...@ieee.org<mailto:emc-p...@ieee.org>> 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 <emcp...@radiusnorth.net<mailto:emcp...@radiusnorth.net>> Mike Cantwell <mcantw...@ieee.org<mailto:mcantw...@ieee.org>> For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org<mailto:j.bac...@ieee.org>> David Heald <dhe...@gmail.com<mailto: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.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 <emcp...@radiusnorth.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
