From: [email protected] <[email protected]> Sent: Thursday, November 21, 2019 11:24 AM To: [email protected] Subject: Re: [PSES] Question on 15.407 spurious emissions testing method enforcement
Hi Charles, I hope you are well. When performing your 15.109 emissions (part 15 subpart B) on the digital device part of the product, you should have the transmitter part active (powered) but it does not need to be transmitting. Receiver mode would be nice, or active scanning, or something like that. You then test your unintentional radiator emissions from the whole product, to Part 15.109, with module powered but not transmitting. Remember that your module may now become the highest frequency item in your product, so consider that when figuring out which frequency to test to. (e.g., if you installed a 5.85 GHz WLAN, then your 15.109 emissions need to be done up to ≥29.25 GHz). If you see emissions exceeding the limit which are from the digital device operation of any part of your product (host or module), it is a fail. Then, with your module transmitting, you need to perform the checks to ensure that the final product meets the transmitter spurious emissions tests/limits of 15.407. If you see emissions exceeding the limit which are from the transmitter part of your product, or a result of the interaction between transmitter and host, it is a fail. If you see a fail, fix it, get it passing, sell it, get rich, retire. I think that's the plan, at least. Thanks, Michael. Michael Derby Senior Regulatory Engineer Director ACB Europe Certification Resource for the Wireless Industry Web: www.acbcert.com<http://www.acbcert.com/> e-mail: [email protected]<mailto:[email protected]> Mobile phone: (+44) 7939 880829 (UK area code) Corporate office phone: USA: (+1) 703 847 4700 From: Grasso, Charles <[email protected]<mailto:[email protected]>> Sent: 20 November 2019 17:38 To: [email protected]<mailto:[email protected]> Subject: [PSES] Question on 15.407 spurious emissions testing method enforcement EMC Gurus, According to KDB789033 (Note3) : After January 01, 2019 all emissions are required to meet the limits as specified in the rules and it will not be sufficient to show compliance to the limits specified in Section 15.209. [This means that, for Bands 1, 2a, and 2c, there is ONLY a Peak limit for spurious radiated emissions that are outside of the restricted bands (-27 dBm/MHz, or 68.2 dBuV/m @ 3m). [There is no Average limit for these spurs that are not in restricted bands.] Question: Based on the modular method for applying FCC regulations it is my understanding that a radio should be tested to compliance for limits as specified in Sections 15.407(b)(1-3) BUT then (even with the radio on) the digital portion of an EUT needs to show compliance to only 15.109? In other words, when testing the digital portion of a radio *any* radio spurious emissions that exceed the 109 limits can be ignored? Am I wrong? Thanks! Charles Grasso (w) 303-706-5467 (c) 303-204-2974 - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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To post a message to the list, send your e-mail to <[email protected]<mailto:[email protected]>> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe)<http://www.ieee-pses.org/list.html> List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]<mailto:[email protected]>> Mike Cantwell <[email protected]<mailto:[email protected]>> For policy questions, send mail to: Jim Bacher <[email protected]<mailto:[email protected]>> David Heald <[email protected]<mailto:[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://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) 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]>
