Jan - The shield should cover the transmitter IC on both sides of the board (top and bottom - bottom "shield" could possibly be a plane on the underside of the board that connects through to the shield on the top.
As for the voltage regulation, I am not sure how the LDO regulator works but it needs to limit the upper and lower voltages. The idea is that the output signal might increase with increased input voltage, so that is why full modular approval can only be granted when the module itself contains the voltage limiting circuitry). Regards, Mark At 06:22 AM 3/18/2008, [email protected] wrote: Hello, I have a question concerning 47CFR part 15 subpart C. This concerns using a full modular approval (FMA) for a 13.56MHz RF tag reader. There are certain rules wrt FMA, the design requires: -1- local power supply regulation -2- and shielding of transmitter part This concerns a low-cost RFID reader solution on a small printed circuit board which receives 5V DC and communicates using RS-232. There are but two chips - Philips ICODE reader IC and RS232 buffer - and some passive components (including an xtal). If I apply the above rules to the printed circuit boars is it then sufficient if: -1- the RFID reader chip is shielded by means of a SMD printed circuit board shield -2- the power supply to the RFID reader chip is provided by a low-dropout voltage (LDO) regulator. The RS232 uses the input voltage before the LDO regulator. Kind Regards, Jan Vercammen | Agfa HealthCare EMI specialist | HE/A&D / ELEC2 T +32 3444 6233 | F +32 3 444 6268 Agfa HealthCare NV, Septestraat 27, 2640 Mortsel, Belgium <http://www.agfa.com/healthcare/> http://www.agfa.com/healthcare/ _____ R.O.: Septestraat 27, B-2640 Mortsel, Belgium | RLE Antwerp | VAT BE 0403.003.524 | IBAN BE03570124715584 | Citibank International PLC, B-1050 Brussels Click on link to read important disclaimer: <http://www.agfa.com/healthcare/maildisclaimer> http://www.agfa.com/healthcare/maildisclaimer __________________ Hello, I have a question concerning a part 15 subpart B test (digital device) where the mains voltage of the device is 240V/50Hz or 240V/60Hz. We use a transformer to get 240V in 110V mains countries. We have tested (under self - verification) that the application meets part 15 subpart B but the mains frequency is not 60Hz, obviously it is 50Hz. It is not technically impossible to test it at 60Hz but it requires 3x 5kW (and maybe more). So we rather test it at 50Hz. Is this an issue wrt the FCC?? I have asked the FCC about this problem but I have not received an answer, yet. Any experience or recommendations to share? Kind regards, Jan Vercammen Agfa-HealthCare, belgium - ------------ --------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: <http://www.ieee-pses.org/> http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: <http://listserv.ieee.org/request/user-guide.html> http://listserv.ieee.org/request/user-guide.html List rules: <http://www.ieee-pses.org/listrules.html> 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] All emc-pstc postings are archived and searchable on the web at: <http://www.ieeecommunities.org/emc-pstc> http://www.ieeecommunities.org/emc-pstc - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] 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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
