Hello Mike, The radiated emissions measurements I've made on NFC card readers and tags have been overwhelmingly quiet. Certainly no significant emissions from the intentional radiator part.
The biggest contributor to any radiated emissions test was the system digital controller and emissions from USB or equivalent. Since the system is unlikely to exist in isolation you'll have to consider this part. Hope this helps James ---- MIKE SHERMAN wrote ---- >Esteemed fellow listers -- > > >I'm looking at a very low power, intermittent NFC card reader/writer. Alkaline >battery operated device. NFC is only energized for 10 seconds at a time on >demand, and range to read/write is less than 1 cm from the surface of the >device. > > >I'm not an EE, but my simplified thought process is: "I can barely get this to >couple magnetically with a card sitting on its surface. How could I possibly >interfere with broadcast services or other equipment?" > > >So, oh wise ones, from your experience what actions with respect to FCC are >reasonable to do? For example, radiated emissions testing seems to me like a >total waste of time and money. > > >More technical details: maximum input power to the NFC chip is 17 mW. Chip is >coupled to a flat 30mm x 40mm "NFC Ferrite Antenna (13.56 MHz)" that my EE >describes as "zero gain." We're rating RF output as 0 mW (i.e., rounding off, >it's a lot closer to 0 mW than to 1 mW). > > >Looking forward once again to interesting wisdom from this group. > > >Mike Sherman > >Graco Inc. > >- >---------------------------------------------------------------- >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://www.ieee-pses.org/list.html (including how to >unsubscribe) >List rules: http://www.ieee-pses.org/listrules.html > >For help, send mail to the list administrators: >Scott Douglas <sdoug...@ieee.org> >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.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://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
