Analysis Report

FCC ID: BJ4-WLTX313-A

RF Exposure Info

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FCCID_4343635

Analysis Report Report No.: 18121037HKG-004 The Equipment Under Test (EUT) is a Wireless Door Chime Transmitter (315MHz Wireless push button). When the button of the EUT is activated, the corresponding 315MHz remote door bell receiver (Wireless Plug-in Chime) will sound. No battery is needed as the EUT is powered by the electro-motive force generated by the induction coil activated by mechanical bouncing energy at the releasing moment of the push button. The EUT will be deactivated after the button bouncing. 315MHz portion: Modulation Type: OOK (On-Off Keying) Antenna Type: Integral, Internal Frequency Range: 315MHz, single channel Antenna gain: 0dBi Nominal rated field strength: 70.2 dBµV/m at 3m Maximum allowed field strength of production tolerance: +/- 3dB According to the KDB 447498: Based on the Maximum allowed field strength of production tolerance was 73.2 dBµV/m at 3m in frequency 315 MHz, thus; The EIRP = [(FS*D) ^2*1000 / 30] = 0.0063 mW Conducted power = Radiated Power (EIRP) – Antenna Gain So; Conducted Power = 0.0063 mW The SAR Exclusion Threshold Level: = 3.0 * (min. test separation distance, mm) / sqrt(freq. in GHz) = 3.0 * 5 / sqrt (0.315) mW = 26.73 mW Since the above conducted output power is well below the SAR Exclusion threshold level, so the EUT is considered to comply with SAR requirement without testing.


Document Created: 2019-07-02 15:31:58
Document Modified: 2019-07-02 15:31:58
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