BJ4-12WDB14TXWireless Doorbell Transmitter

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FCC ID: BJ4-12WDB14TX Circuit Description The 370MHz crystal oscillator drives the base of Q1 the final/buffer amplifier. The modulation provided by IC (U2 ISD1110). The output of Q1 has the matching network consisting of L3 and C6 that limit the harmonic content and effect the proper coupling of the antenna to the output stage. Antenna, Ground and Power Source There is no external antenna. There is no external ground connection. The ground is only that of the printed circuit board. Electric current is supplied by a 6 Volt (“AA” size battery x 4) primary battery

Date: 2002-04-27 TEST REPORT Page 1 of 22 No.: HM106906 FCC PART 15 SUBPART C CERTIFICATION REPORT FOR LOW POWER TRANSMITTER TEST REPORT No.:HM106906 Equipment Under Test [EUT]:Chime / Transmitter Model Number:1214 TX Applicant:DESA INTERNATIONAL FCC ID :BJ4-12WDB14TX Date: 2002-04-27 TEST REPORT Page 2 of 22 No.: HM106906 CONTENT: Cover Page 1 of 22 Content Page 2-3 of 22 Conclusion Page 4 of 22 1.0General Details 1.1Test Laboratory Page 5 of 22 1.2Applicant Details Page 5 of 22 Applicant HKSTC Code Number for Applicant Manufacturer 1.3Equipment Under Test [EUT] Page 6 of 22 Description of EUT operation 1.4Date of Order Page 6 of 22 1.5Submitted Sample Page 6 of 22 1.6Test Duration Page 6 of 22 1.7Country of Origin Page 6 of 22 1.8 Additional Information of EUT Page 7 of 22 2.0Technical Details 2.1Investigations Requested Page 8 of 22 2.2Test Standards and Results Summary Page 8 of 22 3.0Test Results 3.1Emission Page 9-13 of 22 3.2Bandwidth Measurement Page 14-15 of 22 Date: 2002-04-27 TEST REPORT Page 3 of 22 No.: HM106906 Appendix A List of Measurement Equipment Page 16 of 22 Appendix B Duty Cycle Correction During 100 msec Page 17-18 of 22 Appendix C Periodic Operation Page 19-22 of 22 Appendix D Photographs Page 19-22 of 22 Date: 2002-04-27 TEST REPORT Page 4 of 22 No.: HM106906 CONCLUSION The submitted product was deemed to have COMPLIED with the requirements of Federal Communications Commission [FCC] Rules and Regulations Part 15. The tests were performed in accordance with the standards described above and on Section 2.2 in this Test Report. Verify byPatrick Wong for Chief Executive Date: 2002-04-27 TEST REPORT Page 5 of 22 No.: HM106906 1.0General Details 1.1Test Laboratory The Hong Kong Standards and Testing Centre Ltd. EMC Laboratory 10 Dai Wang Street, Taipo Industrial Estate New Territories, Hong Kong Telephone:852 2666 1888 Fax:852 2664 4353 1.2Applicant Details Applicant DESA INTERNATIONAL 2901 Industrial Dr. Bowing Green, KY 42101, USA Telephone:(270) 781 9600 Ext. 6443 Fax:(270) 745 7812 HKSTC Code Number for ApplicantSMH001 Manufacturer SMART HERO ENTERPRISES LIMITED. Dong Guan, Dalang, Shui Ping Industrial Area, Dong Guan, Guangdong, China Telephone:86 769 3196501 Fax:86 769 3196503 Date: 2002-04-27 TEST REPORT Page 6 of 22 No.: HM106906 1.3Equipment Under Test [EUT] Description of Sample Product:Chime / Transmitter Manufacturer:Smart Hero Enterprises Ltd. Brand Name:Say What?! Wireless Doorbell Model Number:1214 TX Input Voltage:6Vd.c (“AA” size battery x 4) 1.3.1Description of EUT Operation The Equipment Under Test (EUT) is a DESA International, Chime / Transmitter. The EUT is to transmit RF signal while each button is being, Modulation by Data Code tape is pulses modulation. 1.4Date of Order 2001-02-01 1.5Submitted Sample(s): 1 Sample per model 1.6Test Duration 2002-02-11 1.7Country of Origin China Date: 2002-04-27 TEST REPORT Page 7 of 22 No.: HM106906 1.8Additional Information of EUT SubmittedNot Available User Manual Part List Circuit Diagram Printed Circuit Board [PCB] Layout Block diagram FCC ID Label Date: 2002-04-27 TEST REPORT Page 8 of 22 No.: HM106906 2.0Technical Details 2.1Investigations Requested Perform ElectroMagnetic Interference measurement in accordance with FCC 47CFR [Codes of Federal Regulations] Part 15 and ANSI C63.4:2000 for FCC Certification. 2.2Test Standards and Results Summary Tables EMISSION Results Summary Test ConditionTest RequirementTest MethodClass /Test Result SeverityPassFailedN/A Field Strength of Fundamental Emissions & Spurious Emissions FCC 47CFR 15.231aANSI C63.4:2000N/A Radiated Emissions, 30MHz to 1GHz FCC 47CFR 15.209ANSI C63.4:2000Class B Conducted Emissions on AC, 0.45MHz to 30MHz FCC 47CFR 15.207ANSI C63.4:2000Class B Note: N/A - Not Applicable Date: 2002-04-27 TEST REPORT Page 9 of 22 No.: HM106906 3.0Test Results 3.1Emission 3.1.1Radiated Emissions Test Requirement:FCC 47CFR 15.231a Test Method:ANSI C63.4:2000 Test Date:2002-02-11 Mode of Operation:On mode Test Method: The sample was placed 0.8m above the ground plane on the OATS *. Measurements in both horizontal and vertical polarities were performed. During the test, each emission was maximized by: having the EUT continuously working, investigate all operating modes, rotated about all 3 axis (X, Y & Z) to obtain worst position, manipulating interconnecting cables, rotating turntable, varying antenna height from 1m to 4m in both horizontal and vertical polarization. The emissions worst-case are shown in Test Results of the following pages. *:OATS [Open Area Test Site] located at HKSTC with a metal ground plane on filed with the FCC pursuant to section 2.948 of the FCC rules, with Registration Number: 90657. Test Setup: EUT distance = 3m Pre -Amplifier Receiver Turn Table Computer Ground plane Date: 2002-04-27 TEST REPORT Page 10 of 22 No.: HM106906 Limits for Field Strength of Fundamental Emissions [FCC 47CFR 15.231a]: Frequency Range of Fundamental Field Strength of Fundamental Emission [Peak] Field Strength of Fundamental Emission [Average] [MHz][μV/m][μV/m] 40.66-40.701,000100 70-13050050 130-174500 to 1,500 *50 to 150 * 174-2601,500150 260-4701,500 to 5,000 *150 to 500 * Above 4705,000500 ** Linear interpolations Where F is the frequency in MHz, the formula for calculating the maximum permitted fundamental field strengths are as follows: for the band 130-174 MHz, μV/m at meters=56.81818(F)-6136.3636; for the band 260-470 MHz, μV/m at 3 meters =41.6667(F)-7083.3333. The maximum permissible unwanted emission level is 20dB below the maximum fundamental level. Results: CorrectionLimit **Antenna Factor @3mPolarity dB μ V/m μ V/m 370.1155.320.275.55956.683,379.3Horizontal Field Strength Measured dB μ V/m μ V/m Field Strength of Fundamental Emissions Peak Value Frequency Level @3m Field Strength MHzdB μ V/m CorrectionLimit @3mAntenna FactorPolarity dB μ V/m μ V/m 740.2232.828.661.41174.98,337.9Horizontal +1110.3324.933.458.3822.25,000.0Horizontal +1480.4428.625.454.0501…

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TEST SET UP PHOTOGRAPH OF THE PRODUCT MEASUREMENT OF RADIATED EMISSION TEST SET UP