03 FCC RF Exposure
ALPS ALPINE CO., LTD. WB1G0636 Hand Unit CWTWB1G0636 CWTWB1G0636 wb1g0636
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Document DEVICE REPORTGetApplicationAttachment.html?id=8173155March 25, 2025 FCC ID: CWTWB1G0636 To whom it may concern, We, UL Japan, Inc, hereby declare that Hand Unit, model: TWB1G0636 (FCC ID: CWTWB1G0636) of ALPS ALPINE CO., LTD. is exempt from RF exposure SAR evaluation because the available maximum time-averaged power or effective radiated power (ERP), whichever is greater, is less than or equal to the threshold Pth (mW) described in the following formula according to the Code of Federal Regulation title 47 section 1.1307(b)(3)(i)(B). This method is used at separation distances d (cm) from 0.5 centimeters to 40 centimeters and at frequencies from 0.3 GHz to 6 GHz (inclusive) for single RF sources. Pth is given by: mW / 20 cm 20 cm 20 cm 40 cm Where log 60 and is in GHz mW 2040 3060 0.3 GHz 1.5 GHz 1.5 GHz 6 GHz When the minimum separation distance is shorter than 0.5 cm, 0.5 cm is applied. The SAR evaluation exemption threshold is calculated as below. UL Japan, Inc. Shonan EMC Lab. 1-22-3 Megumigaoka, Hiratsuka-shi, Kanagawa-ken, 259-1220 Japan T:: +81.463.50.6400 / F:: +81.463.50.6401 / W:: japan.ul.com [UHF part] Pth (mW) f (GHz) ERP 20 cm (mW) d (cm) 23.16 0.43392 885.197 0.5 Conducted Power (dBm) (mW) Antenna Gain (dBi) EIRP (dBm) ERP (dBm) (mW) 1.00 1.26 -18.10 -20.24 0.01 The Maximum time-averaged power or ERP whichever greater is 1.3 mW. (Rounded up to two decimals place) *The eirp was derived from a field strength specification value of the fundamental signal(77.1 dBuV/m at 3m) which was converted to an eirp using the free space equation E = (30PG)/d. UWB part: Its output power meets the 1-mW test exemption threshold stated in the Code of Federal Regulation title 47 section 1.1307(b)(3)(i)(A). This device available maximum time-averaged power is 0.05 mW, so no other assessment is required. Reference of average Power [EIRP] EIRP specification value: -41.3 dBm/MHz = 0.00007413 mW/MHz *Specification value 99 % occupied bandwidth = 619.794 MHz 0.00007413 mW/MHz [mW/MHz] x 619.794 [MHz] = 0.04594533 [mW] Thank you for your attention to this matter. Toyokazu Immaura Engineer UL Japan, Inc. Shonan EMC Lab. 1-22-3 Megumigaoka, Hiratsuka-shi, Kanagawa-ken, 259-1220 Japan T:: +81.463.50.6400 / F:: +81.463.50.6401 / W:: japan.ul.com
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- CWTWB1G0636 - ALPS ALPINE CO., LTD. Hand Unit [WB1G0636] Acrobat Distiller 25.0 (Windows)