Eric, Robert is correct. The FCC requires the use of a loop antenna for measurements below 30MHz. The test distance required may put you in a bind, so Part 15 says for frequencies below 30MHz you can use lesser test distances and correct for the distance using a 40dB/decade conversion, as opposed to a 20dB/decade correction for frequencies above 30MHz. In addition, if by taking readings at a minimum of two different test distances you can prove a fall off ratio other than 40dB/decade, that can be used if documented in the report. The FCC does caution against making measurements in the near field. See Part 15.31 for further guidance.
Bill Stumpf DLS Electronics 166 South Carter St. Genoa City WI 53128 ph: 262-279-0210 fx: 262-279-3630 email: bstu...@dlsemc.com From: robert.v.del...@us.ul.com [mailto:robert.v.del...@us.ul.com] Sent: Monday, September 08, 2003 6:44 AM To: Eric Penne Cc: emc-p...@majordomo.ieee.org; owner-emc-p...@majordomo.ieee.org Subject: Re: 508kHz Intentional Radiator FCC Eric, The FCC will only allow the use of a loop antenna for E-field measurements below 30MHz. Hope this helps. (Embedded image moved to file: pic18467.pcx) "Eric Penne" <epe...@olug.org> To: <emc-p...@majordomo.ieee.org> Sent by: cc: owner-emc-pstc@majordom Subject: 508kHz Intentional Radiator FCC o.ieee.org 09/05/2003 03:53 PM Please respond to "Eric Penne" I'm trying to find the test equipment requirements for testing a 508kHz intentional transmitter. More specifically I'm trying to find out if the FCC wants to use a loop or rod antenna. This is a large unknown to me and I am trying to research it right now. I was hoping that some of list members may be able to give me some more information and anything "gotchas" that I should be looking for. Thanks Eric Penne epe...@olug.org 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc -- For more information about UL, its Marks, and its services for EMC, quality registrations and product certifications for global markets, please access our web sites at http://www.ul.com and http://www.ulc.ca, or contact your local sales representative. -- ********* Internet E-mail Confidentiality Disclaimer ********** This e-mail message may contain privileged or confidential information. If you are not the intended recipient, you may not disclose, use, disseminate, distribute, copy or rely upon this message or attachment in any way. If you received this e-mail message in error, please return by forwarding the message and its attachments to the sender. Underwriters Laboratories Inc. and its affiliates do not accept liability for any errors, omissions, corruption or virus in the contents of this message or any attachments that arise as a result of e-mail transmission. ***************************************************************** 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
