Hi Larry The local oscillator frequency must meet the limits, always has. Before digital circuit appeared in radios LCO emissions were pretty much all we were looking for
Limits I think are in 15.209 Best regards Tom Sent from my iPhone On Sep 16, 2011, at 9:18 AM, Larry Stillings <[email protected]> wrote: Hello all, I need to be re-educated. When testing an stand-alone FM receiver for FCC Part 15 Class B Verification. Is there an exemption for the local oscillator when you are tuned to a frequency (eg tuned frequency plus 10.7 MHz or minus depending on the design). In part 2 of the rules there is this statement. Emission. Radiation produced, or the production of radiation, by a radio transmitting station. NOTE: For example, the energy radiated by the local oscillator of a radio receiver would not be an emission but a radiation. (RR) and then Radiation. The outward flow of energy from any source in the form of radio waves. (RR) So, does that mean that the local oscillator is exempt from the Class B limit? I thought it was clearer somewhere in the rules, but I cannot find it in either Part 15 or ANSI C63.4-2009. It is clear in EN 55013 what the limits are for a local oscillator. Thanks in advance. Larry K. Stillings Compliance Worldwide, Inc. Test Locally, Sell Globally! FCC - Wireless - Telecom - CE Marking 357 Main Street Sandown, NH 03873 (603) 887 3903 Fax 887-6445 www.complianceworldwide.com Privileged/Confidential Information may be contained in this message. If you are not the addressee indicated in this message (or responsible for delivery of the message to such person), you may not copy or deliver this message to anyone. In such case, you should destroy this message and kindly notify the sender by reply email. Please advise immediately if you or your employer do not consent to Internet email for messages of this kind. Opinions, conclusions and other information in this message that do not relate to the official business of my firm shall be understood as neither given nor endorsed by it. - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to < <mailto:[email protected]> [email protected]> All emc-pstc postings are archived and searchable on the web at <http://product-compliance.oc.ieee.org/> http://product-compliance.oc.ieee.org/ Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: <http://www.ieee-pses.org/> http://www.ieee-pses.org/ 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 < <mailto:[email protected]> [email protected]> Mike Cantwell < <mailto:[email protected]> [email protected]> For policy questions, send mail to: Jim Bacher < <mailto:[email protected]> [email protected]> David Heald < <mailto:[email protected]> [email protected]> - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at http://product-compliance.oc.ieee.org/ Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ 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]>
