Please note “ whichever is higher”. Since the operating frequency of your intentional device portion is 2.4GHz, the frequency range of your radiated measurement is up to 24GHz according to Section 15.33 (1) and 15.33 (4)
Thanks, Ben From: emcp...@aol.com [mailto:emcp...@aol.com] Sent: Wednesday, July 14, 2010 12:58 PM To: Kim, Ben; emc-p...@ieee.org Subject: Re: Radiated EMI for ITE with Wireless Hi Ben, So according to this statement, I would not need to test above 1GHz because the "digital device" portion has a maximum operating frequency of 16MHz. The bluetooth portion is already covered by another company's FCC ID so I'm not testing that portion. Thanks, Tim In a message dated 7/14/2010 12:26:08 P.M. Pacific Daylight Time, ben....@netapp.com writes: Tim, See FCC Part 15, Section 15.33 (4). In case equipment contains both intentional radiator and digital device, the radiated test frequency range is determined based on (Nth harmonics of operating frequency-intentional radiator portion) and (5th harmonics of digital device portion), whichever is the higher. Thanks, Ben Section 15.33 Frequency range of radiated measurements. (a) Unless otherwise noted in the specific rule section under which the equipment operates for an intentional radiator the spectrum shall be investigated from the lowest radio frequency signal generated in the device, without going below 9 kHz, up to at least the frequency shown in this paragraph: (1) If the intentional radiator operates below 10 GHz: to the tenth harmonic of the highest fundamental frequency or to 40 GHz, whichever is lower. (2) If the intentional radiator operates at or above 10 GHz and below 30 GHz: to the fifth harmonic of the highest fundamental frequency or to 100 GHz, whichever is lower. (3) If the intentional radiator operates at or above 30 GHz: to the fifth harmonic of the highest fundamental frequency or to 200 GHz, whichever is lower, unless specified otherwise elsewhere in the rules. (4) If the intentional radiator contains a digital device, regardless of whether this digital device controls the functions of the intentional radiator or the digital device is used for additional control or function purposes other than to enable the operation of the intentional radiator, the frequency range shall be investigated up to the range specified in paragraphs (a)(1)-(a)(3) of this section or the range applicable to the digital device, as shown in paragraph (b)(1) of this Section, whichever is the higher frequency range of investigation. From: emcp...@aol.com [mailto:emcp...@aol.com] Sent: Wednesday, July 14, 2010 11:01 AM To: emc-p...@ieee.org Subject: Re: Radiated EMI for ITE with Wireless So far I have a 50-50 response on this. Thanks to those that replied. Does anyone have some text from the standards to back up the answers? 1. I understand that FCC rules say to consider the highest frequency used in the product for testing above 1GHz. This would mean that we need to test above 1GHz, considering the 2.4GHz bluetooth. 2. One could justify not testing above 1GHz considering the fact that the bluetooth has already gone through testing and certification on its own. In this case we would only be concerned about the digital device portion which has a maximum frequency of 16MHz. Thanks, Tim In a message dated 7/13/2010 7:15:34 P.M. Pacific Daylight Time, emcp...@aol.com writes: Hello, I have a class B digital device that incorporates a wireless module. Other than the 2.4 GHz bluetooth, the rest of the device has a maximum oscillator of 16 MHz. The bluetooth part is already approved with a modular approval so I'm not concerned about the intentional radiator part. I'm only doing the regular unintentional radiator portion for FCC and CE (CISPR 22). The question is how high in frequency should this device be tested? Does the bluetooth count toward the highest clock even though it is already approved? All other clocks/oscillators are well below the 108 MHz cutoff for testing above 1 GHz. Thanks Tim Pierce - ---------------------------------------------------------------- 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 <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. 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