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. 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. 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
