FCC Cover Letter

FCC ID: QOQWFM200

Cover Letter(s)

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FCCID_4469070

SILICON LABS Cover Letter SGS North America Inc. 620 Old Peachtree Road, SUITE 100 Suwanee, Georgia, United States Afin: To Whom it May Concern / Application Examiner / Review Engineer / Officer in Charge Re: Cover letter regarding the application for FCC ID: QOQWFM200 Dear Madam or Sir, We, Silicon Laboratories Finland Oy, a corporation validly organized and existing under the laws of Finland, having its principal place of business at Alberga Business Park, Bertel Jungin aukio 3, 02600 Espoo, Finland, hereby state that we would like to apply for the full modular grant of our Wi-Fl modules having model names of WFM200SA and WFM200SN. The same grant, under the same FCC ID, should cover both models as a family, where the only difference between the models is described at the end of the next paragraph. Our devices are low-power Wi-Fl 802.11 bgn SIP transceiver radio modules, operating at a bandwidth up to 20MHz, targeted to, but not limited to, function within Linux-based host systems as loT network co-processors for connectivity to WLANs, enabling wireless communication of data and audio for the end-products they are going to be embedded in. The wireless chipset within each module comes with two RE ports which are routed to two corresponding module’s RF pins. An end-product manufacturer can decide to connect external antenna to RE1 and/or RF2 via the exposed RE pins. An unused RE port should be 500 terminated. Reason for connecting both external antennas would be to implement the supported switched diversity. However, there is no MIMO functionality, and there is never simultaneous transmission out of the antennas, since an internal switch redirects the RF signal to either RF1 or RF2, where RF2 has —1dB less TX power compared to RF1. Only the A-variant, WFM200SA, has an embedded antenna assembled, so a customer might want to use It, instead of an external antenna, by shorting the RF1 pin with the adjacent ANT_IN pin using a 00 resistor; the embedded antenna being or not being assembled is in fact the only difference between the models WFM200SA and WFM200SN, and the more complete variant (the A-variant) has been under compliance testing since it covers all possible test cases and scenarios. Should there be any query regarding this request, please do not hesitate to contact the undersigned. Thank you for your attention to this matter. Place and date of issue (of thsleffè):’ Espoo, September Senior Contact: Pasi Rahikkala Job Title: Staff Hardware Engineer, loT Wireless Modules Email: pasi.rahikkala@silabs.com Silicon Laboratories Finland Oy Alberga Business Park Bertel Jungin aukio 3 Fl-02600 Espoo, Finland Phone: +358 9 435 5060 www.silabs.com


Document Created: 2019-10-03 04:07:14
Document Modified: 2019-10-03 04:07:14
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