>> So, what will happen to PLC (PowerLine Communication) in US ? I >> know an application called CEBus and they operate in the frequency >> band 100kHz-400kHz. Those folks using CEBus will not meet the new >> conducted emission requirements. >> >> Maybe, that sort of equipment is not within the scope of FCC part 15 / 18 ?
Yes, it IS covered by Part 15. Here's what Part 15 says about it: =========================================================================== ======= Section 15.107 Conducted limits. (c) The limits shown in paragraphs (a) and (b) of this Section shall not apply to carrier current systems operating as unintentional radiators on frequencies below 30 MHz. In lieu thereof, these carrier current systems shall be subject to the following standards: (1) For carrier current systems containing their fundamental emission within the frequency band 535-1705 kHz and intended to be received using a standard AM broadcast receiver: no limit on conducted emissions. (2) For all other carrier current systems: 1000 uV within the frequency band 535-1705 kHz, as measured using a 50 µH/50 ohms LISN. (3) Carrier current systems operating below 30 MHz are also subject to the radiated emission limits in Section 15.109(e). =========================================================================== ***Outside .535-1705 KHz, and below 30 MHz, there is NO conducted limit for carrier current PLC systems.*** =========================================================== Section 15.109 Radiated limits. (e) Carrier current systems used as unintentional radiators or other unintentional radiators that are designed to conduct their radio frequency emissions via connecting wires or cables and that operate in the frequency range of 9 kHz to 30 MHz, including devices that deliver the radio frequency energy to transducers, such as ultrasonic devices not covered under Part 18 of this Chapter, shall comply with the radiated emission limits for intentional radiators provided in Section 15.209 for the frequency range of 9 kHz to 30 MHz. As an alternative, carrier current systems used as unintentional radiators and operating in the frequency range of 525 kHz to 1705 kHz may comply with the radiated emission limits provided in Section 15.221(a). At frequencies above 30 MHz, the limits in paragraph (a), (b) or (g) of this Section, as appropriate, continue to apply. =========================================================== Section 15.209 Radiated emission limits, general requirements. (Extract of tabular data): ========================================================= 0.009 - 0.490, 2400/F(kHz), at 300 meters 0.490 - 1.705, 24000/F(kHz), at 30 meters 1.705 - 30.0, 30 dBuV/m at 30 meters. ========================================================== CEBus would have no conducted limit, but a radiated limit of from 24uV/m to 6uV/m at 300 meters. (Higher in frequency, we can expect systems operating above the AM broadcast band to generate interference to Short Wave and Amateur Radio reception.) Cortland ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
