Hi Group, Very true remarks on PLC or BPL H-field measurements. We in Europe did a lot of them. In Germany NB30 Decree by RegTP (mag. field strength limits taken at 3m, 3 axis orientations, with 9 kHz BW) and using a 60cm magnetic loop (CISPR 16) mostly from R&S sets the rules which seem to get now more widely accepted. The big problem is background noise/sensitivity. The tuned loop UK approach improves sensitivity over 20dB. For EU PLC field trial test on Low voltage distribution (230V/50 Hz) examples please check www.euro-emc-service.de under R&D, end of page, for free PLC article downloads.
kind regards Dr. Diethard Hansen (HB9CVQ, DK2VQ) EES President, Principal Consultant, Trainer US Senior NARTE certif. EMC Eng. 001937NE EMC+Automotive+Telecom QM+techn. EA-Auditor Euro EMC SERVICE (EES) Dr.-Ing. D. Hansen POB 64, Bahnhofstr.39, CH-8965 Berikon 2, Switzerland, Swiss VAT (Mwst.)No.:323214 tel./fax: +41 566 33 73 81 German mobile phone: +49(0)1736015909 www.euro-emc-service.de [email protected] (mailto:[email protected]) Consulting+Seminars+R&D-Projects Marketing+CE-Testing+ww.Audits From: [email protected] [mailto:[email protected]]On Behalf Of [email protected] Sent: Thursday, March 25, 2004 8:58 PM To: [email protected]; [email protected]; [email protected] Subject: RE: Shielded Loop Antenna for HF Jack, Are you on the AntenneX discussion list? We have been analyzing BLP and have decided that the FCC measurement method is hopelessly flawed. The FCC method calls for a vertically oriented loop at a 1 meter height. But, the major radiation (from sims) shows it being horizontally polarized and 20 dB higher at 10 meters (where a ham antenna is likely to be). Even if the method is changed to use a horizontal loop at 10 meters, FCC part 15.209 still allows such a high field that it could render the HF bands useless. Dave Cuthbert Micron Technology From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Thursday, March 25, 2004 11:19 AM To: [email protected]; [email protected] Subject: RE: Shielded Loop Antenna for HF Hello Jack, We use shielded loop antennas for measuring inductive loop systems operating between 40 kHz and 8 MHz. We have Electro-Metrics and ETS-Lindgren loops. In this frequency range, we have found it to be important to have a measurement site free of metallic objects, i.e., no ground plane, buried utilities (including re-enforced drainage pipes), buried trash etc. The signal ends up coupling to the metallic objects and corrupting the roll-off factor, influencing the repeatability of the measurement. Pre-amp, high pass filters, and appropriate RBW (if you have to worry about pulsing characteristics) help to obtain a low level signal and harmonic measurement. Good luck, Don Umbdenstock Sensormatic 561 912 6440 From: Jacob Schanker [mailto:[email protected]] Sent: Wednesday, March 24, 2004 5:40 PM To: EMC-PSTC Subject: Shielded Loop Antenna for HF Fellow Groupees: :) I am looking for suggestions on sources of shielded loop antennas good to 30 MHz. The usage will be for a study of radiation from a BPL (PLC) system. Any sources and recommendations, and anecdotal experiences, will be appreciated. Thanks, Jack Jacob Z. Schanker, P.E. Consulting Engineer 65 Crandon Way Rochester, NY 14618 Tel: 585 442 3909 Fax: 585 442 2182 [email protected] This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ieee-pses.org/ 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://www.ieeecommunities.org/emc-pstc This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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