Test reports

FCC ID: 2AS8H-DHP780

Test Report

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FCCID_4322419

Page 1 of 26 Report No.: HK1905201072E FCC TEST REPORT Test report On Behalf of Number One Commerce Co., LTD For Wireless Digital Headphones Model No.: DHP780 FCC ID: 2AS8H-DHP780 Prepared for : Number One Commerce Co., LTD Room 1635, 16/F., Metro Centre 2, 21 Lam Hing Street, Kowloon Bay, Hong Kong, China Prepared By : Shenzhen HUAK Testing Technology Co., Ltd. 1F, B2 Building, Junfeng Zhongcheng Zhizao Innovation Park, Fuhai Street, Bao'an District, Shenzhen City, China Date of Test: May 24, 2019 ~ May 29, 2019 Date of Report: May 30, 2019 Report Number: HK1905201072E

Page 2 of 26 Report No.: HK1905201072E TEST RESULT CERTIFICATION Applicant’s name ................. : Number One Commerce Co., LTD Room 1635, 16/F., Metro Centre 2, 21 Lam Hing Street, Kowloon Address ................................. : Bay, Hong Kong, China Manufacture's Name ............ : Number One Commerce Co., LTD Room 1635, 16/F., Metro Centre 2, 21 Lam Hing Street, Kowloon Address ................................. : Bay, Hong Kong, China Product description Trade Mark: RCA Product name ........................... : Wireless Digital Headphones Model and/or type reference : DHP780 FCC Rules and Regulations Part 15 Subpart C Section 15.249 Standards ............................. : ANSI C63.10: 2013 This publication may be reproduced in whole or in part for non-commercial purposes as long as the Shenzhen HUAK Testing Technology Co., Ltd. is acknowledged as copyright owner and source of the material. Shenzhen HUAK Testing Technology Co., Ltd. takes no responsibility for and will not assume liability for damages resulting from the reader's interpretation of the reproduced material due to its placement and context. Date of Test ............................................ : Date (s) of performance of tests ............. : May 24, 2019 ~ May 29, 2019 Date of Issue ........................................... : May 30, 2019 Test Result ............................................... : Pass Testing Engineer : (Gary Qian) Technical Manager : (Eden Hu) Authorized Signatory : (Jason Zhou)

Page 3 of 26 Report No.: HK1905201072E Table of Contents Page 1 . TEST SUMMARY 4 2 . GENERAL INFORMATION 5 2.1 GENERAL DESCRIPTION OF EUT 5 2.2 Carrier Frequency of Channels 6 2.3 Operation of EUT during testing 6 2.4 DESCRIPTION OF TEST SETUP 6 2.5 MEASUREMENT INSTRUMENTS LIST 7 3 . CONDUCTED EMISSIONS TEST 8 3.1 Conducted Power Line Emission Limit 8 3.2 Test Setup 8 3.3 Test Procedure 8 3.4 Test Result 8 4 RADIATED EMISSION TEST 11 4.1 Radiation Limit 11 4.2 Test Setup 11 4.3 Test Procedure 12 4.4 Test Result 12 5 BAND EDGE 18 5.1 Limits 18 5.2 Test Procedure 18 5.3 Test Result 19 6 OCCUPIED BANDWIDTH MEASUREMENT 21 6.1 Test Setup 21 6.2 Test Procedure 21 6.3 Measurement Equipment Used 21 6.4 Test Result 21 7 ANTENNA REQUIREMENT 23 8 PHOTOGRAPH OF TEST 24 8.1 Conducted Emission 24 8.2 Radiated Emission 25 9 PHOTOS OF THE EUT 26

Page 4 of 26 Report No.: HK1905201072E 1. TEST SUMMARY 1.1 TEST PROCEDURES AND RESULTS DESCRIPTION OF TEST RESULT CONDUCTED EMISSIONS TEST COMPLIANT RADIATED EMISSION TEST COMPLIANT BAND EDGE COMPLIANT OCCUPIED BANDWIDTH MEASUREMENT COMPLIANT ANTENNA REQUIREMENT COMPLIANT 1.2 TEST FACILITY Test Firm : Shenzhen HUAK Testing Technology Co., Ltd. Address : 1F, B2 Building, Junfeng Zhongcheng Zhizao Innovation Park, Fuhai Street, Bao'an District, Shenzhen City, China 1.3 MEASUREMENT UNCERTAINTY Measurement Uncertainty Conducted Emission Expanded Uncertainty = 2.23dB, k=2 Radiated emission expanded uncertainty(9kHz-30MHz) = 3.08dB, k=2 Radiated emission expanded uncertainty(30MHz-1000MHz) = 4.42dB, k=2 Radiated emission expanded uncertainty(Above 1GHz) = 4.06dB, k=2

Page 5 of 26 Report No.: HK1905201072E 2. GENERAL INFORMATION 2.1 GENERAL DESCRIPTION OF EUT Equipment Wireless Digital Headphones Trade Mark RCA Model Name DHP780 Serial Model / Model Difference / FCC ID 2AS8H-DHP780 Antenna Type Internal Antenna Antenna Gain 0dBi Operation frequency 2406MHZ to 2472MHz Number of Channels 34CH Modulation Type GFSK Power Source DC 5V 0.55A From AC Adapter Model:YLJXA-T05055 Adapter Information Input:AC100-240, 50/60Hz, 0.5A MAX Output:DC5V 0.55A

Page 6 of 26 Report No.: HK1905201072E 2.2 Carrier Frequency of Channels Channel List Frequency Frequency Frequency Frequency Channel (MHz) Channel (MHz) Channel (MHz) Channel (MHz) 01 2406 11 2426 21 2446 31 2466 02 2408 12 2428 22 2448 32 2468 03 2410 13 2430 23 2450 33 2470 04 2412 14 2432 24 2452 34 2472 05 2414 15 2434 25 2454 / / 06 2416 16 2436 26 2456 / / 07 2418 17 2438 27 2458 / / 08 2420 18 2440 28 2460 / / 09 2422 19 2442 29 2462 / / 10 2424 20 2444 30 2464 / / 2.3 Operation of EUT during testing Operating Mode The mode is used: Transmitting mode Low Channel: 2406MHz Middle Channel: 2438MHz High Channel: 2472MHz 2.4 DESCRIPTION OF TEST SETUP Operation of Radiated Emission EUT during testing: EUT Headphones AC 120V, 60Hz AC Adapter Operation of EUT during Conducted testing: EUT Headphones AC 120V, 60Hz AC Adapter Operation of EUT during Above1GHz Radiation testing: EUT AC 120V, 60Hz AC Adapter

Page 7 of 26 Report No.: HK1905201072E 2.5 MEASUREMENT INSTRUMENTS LIST Cal. Item Equipment Manufacturer Model No. Serial No. Last Cal. Interval L.I.S.N. 1. Artificial Mains R&S ENV216 HKE-002 Dec. 27, 2018 1 Year Network 2. Receiver R&S ESCI 7 HKE-010 Dec. 27, 2018 1 Year RF automatic 3. Tonscend JS0806-2 HKE-060 Dec. 27, 2018 1 Year control unit 4. Spectrum analyzer R&S FSP40 HKE-025 Dec. 27, 2018 1 Year 5. Spectrum analyzer Agilent N9020A HKE-048 Dec. 27, 2018 1 Year 6. Preamplifier Schwarzbeck BBV 9743 HKE-006 Dec. 27, 2018 1 Year 7. EMI Test Receiver Rohde & Schwarz ESCI 7 HKE-010 Dec. 27, 2018 1 Year Bilog Broadband 8. Schwarzbeck VULB9163 HKE-012 Dec. 27, 2018 1 Year Antenna FMZB 1519 9. Loop Antenna Schwarzbeck HKE-014 Dec. 27, 2018 1 Year B 10. Horn Antenna Schewarzbeck 9120D HKE-013 Dec. 27, 2018 1 Year EMC051845 11. Pre-amplifier EMCI HKE-015 Dec. 27, 2018 1 Year SE 12. Pre-amplifier Agilent 83051A HKE-016 Dec. 27, 2018 1 Year EMI Test Software JY3120-B 13. Tonscend HKE-083 Dec. 27, 2018 N/A EZ-EMC Version 14. Power Sensor Agilent E9300A HKE-086 Dec. 27, 2018 1 Year 15. Spectrum analyzer Agilent N9020A HKE-048 Dec. 27, 2018 1 Year 16. Signal generator Agilent N5182A HKE-029 Dec. 27, 2018 1 Year 17. Signal Generator Agilent 83630A HKE-028 Dec. 27, 2018 1 Year 18. Shielded room Shiel Hong 4*3*3 HKE-039 Dec. 27, 2018 3 Year

Page 8 of 26 Report No.: HK1905201072E 3. CONDUCTED EMISSIONS TEST 3.1 Conducted Power Line Emission Limit For unintentional device, according to § 15.107(a) Line Conducted Emission Limits is as following * Decreasing linearly with the logarithm of the frequency For intentional device, according to §15.207(a) Line Conducted Emission Limit is same as above table. 3.2 Test Setup 3.3 Test Procedure 1, The equipment was set up as per the test configuration to simulate typical actual usage per the user’s manual. The EUT is a tabletop system, a wooden table with a height of 0.8 meters is used and is placed on the ground plane as per ANSI C63.10. 2, Support equipment, if needed, was placed as per ANSI C63.10. 3, All I/O cables were positioned to simulate typical actual usage as per ANSI C63.10. 4, If a EUT received DC power from the USB Port of Notebook PC, the PC’s adapter received AC120V/60Hz power through a Line Impedance Stabilization Network (LISN) which supplied power source and was grounded to the ground plane. 5, All support equipments received AC power from a second LISN, if any. 6, The EUT test program was started. Emissions were measured on each current carrying line of the EUT using a spectrum Analyzer / Receiver connected to the LISN powering the EUT. The LISN has two monitoring points: Line 1 (Hot Side) and Line 2 (Neutral Side). Two scans were taken: one with Line 1 connected to Analyzer / Receiver and Line 2 connected to a 50 ohm load; the second scan had Line 1 connected to a 50 ohm load and Line 2 connected to the Analyzer / Receiver. 7, Analyzer / Receiver scanned from 150 KHz to 30MHz for emissions in each of the test modes. 3.4 Test Result Pass All the test modes completed for test. only the worst result of of AC120V/60Hz (GFSK High Channel ) was reported as below:

Page 9 of 26 Report No.: HK1905201072E Test Specification: Line Remark: Transd = Cable lose + Antenna factor - Pre-amplifier; Margin = Limit – Level

Page 10 of 26 Report No.: HK1905201072E Test Specification: Neutral Remark: Transd = Cable lose + Antenna factor - Pre-amplifier; Margin = Limit – Level

Page 11 of 26 Report No.: HK1905201072E 4 RADIATED EMISSION TEST 4.1 Radiation Limit For unintentional device, according to § 15.109(a), except for Class A digital devices, the field strength of radiated emissions from unintentional radiators at a distance of 3 meters shall not exceed the following values： Frequency Distance Radiated Radiated (MHz) (Meters) (dBμV/m) (μV/m) 30-88 3 40 100 88-216 3 43.5 150 216-960 3 46 200 Above 960 3 54 500 For intentional device, according to § 15.209(a), the general requirement of field strength of radiated emissions from intentional radiators at a distance of 3 meters shall not exceed the above table. 4.2 Test Setup （1）Radiated Emission Test-Up Frequency Below 30MHz （2）Radiated Emission Test-Up Frequency 30MHz~1GHz

Page 12 of 26 Report No.: HK1905201072E （3）Radiated Emission Test-Up Frequency Above 1GHz 4.3 Test Procedure 1. Below 1GHz measurement the EUT is placed on turntable which is 0.8m above ground plane. And above 1GHz measurement EUT was placed on low permittivity and low tangent turn table which is 1.5m above ground plane. 2. The turntable shall be rotated for 360 degrees to determine the position of maximum emission level. 3. EUT is set 3m away from the receiving antenna, which is varied from 1m to 4m to find out the highest emissions. 4. Maximum procedure was performed on the six highest emissions to ensure EUT compliance. 5. And also, each emission was to be maximized by changing the polarization of receiving antenna both horizontal and vertical. 6. Repeat above procedures until the measurements for all frequencies are complete. 7. The test frequency range from 9KHz to 25GHz per FCC PART 15.33(a). Note: For battery operated equipment, the equipment tests shall be performed using a new battery. 4.4 Test Result PASS All the test modes completed for test. The worst case of Radiated Emission is CH 2406; the test data of this mode was reported.

Page 13 of 26 Report No.: HK1905201072E Below 1GHz Test Results: Antenna polarity: H Remark: Transd = Cable lose + Antenna factor - Pre-amplifier; Margin = Limit – Level

Page 14 of 26 Report No.: HK1905201072E Antenna polarity: V Remark: Transd = Cable lose + Antenna factor - Pre-amplifier; Margin = Limit – Level Remark： (1) Measuring frequencies from 9 KHz to the 1 GHz, Radiated emission test from 9KHz to 30MHz was verified, and no any emission was found except system noise floor. (2) * denotes emission frequency which appearing within the Restricted Bands specified in provision of 15.205, then the general radiated emission limits in 15.209 apply. (3) The IF bandwidth of EMI Test Receiver between 30MHz to 1GHz was 120KHz, 1 MHz for measuring above 1 GHz, below 30MHz was 10KHz.

Page 15 of 26 Report No.: HK1905201072E Above 1 GHz Test Results: CH Low (2406MHz) Horizontal: Frequency Meter Reading Factor Emission Level Limits Margin Detector (MHz) (dBμV) (dB) (dBμV/m) (dBμV/m) (dB) Type 2406 113.23 -5.84 107.39 114 -6.61 peak 2406 87.98 -5.84 82.14 94 -11.86 AVG 4812 57.22 -3.64 53.58 74 -20.42 peak 4812 47.87 -3.64 44.23 54 -9.77 AVG 7218 53.19 -0.95 52.24 74 -21.76 peak 7218 42.67 -0.95 41.72 54 -12.28 AVG Remark: Factor = Antenna Factor + Cable Loss – Pre-amplifier. Vertical: Frequency Meter Reading Factor Emission Level Limits Margin Detector (MHz) (dBμV) (dB) (dBμV/m) (dBμV/m) (dB) Type 2406 112.11 -5.84 106.27 114 -7.73 peak 2406 85.23 -5.84 79.39 94 -14.61 AVG 4812 57.98 -3.64 54.34 74 -19.66 peak 4812 48.23 -3.64 44.59 54 -9.41 AVG 7218 55.24 -0.95 54.29 74 -19.71 peak 7218 39.87 -0.95 38.92 54 -15.08 AVG Remark: Factor = Antenna Factor + Cable Loss – Pre-amplifier.

Page 16 of 26 Report No.: HK1905201072E CH Middle (2438MHz) Horizontal: Frequency Meter Reading Factor Emission Level Limits Margin Detector (MHz) (dBμV) (dB) (dBμV/m) (dBμV/m) (dB) Type 2438 110.32 -5.71 104.61 114 -9.39 peak 2438 84.43 -5.71 78.72 94 -15.28 AVG 4876 55.87 -3.51 52.36 74 -21.64 peak 4876 44.23 -3.51 40.72 54 -13.28 AVG 7314 53.98 -0.82 53.16 74 -20.84 peak 7314 38.75 -0.82 37.93 54 -16.07 AVG Remark: Factor = Antenna Factor + Cable Loss – Pre-amplifier. Vertical: Frequency Meter Reading Factor Emission Level Limits Margin Detector (MHz) (dBμV) (dB) (dBμV/m) (dBμV/m) (dB) Type 2438 108.38 -5.71 102.67 114 -11.33 peak 2438 84.22 -5.71 78.51 94 -15.49 AVG 4876 55.24 -3.51 51.73 74 -22.27 peak 4876 46.29 -3.51 42.78 54 -11.22 AVG 7314 56.44 -0.82 55.62 74 -18.38 peak 7314 43.19 -0.82 42.37 54 -11.63 AVG Remark: Factor = Antenna Factor + Cable Loss – Pre-amplifier.

Page 17 of 26 Report No.: HK1905201072E CH High (2472MHz) Horizontal: Frequency Meter Reading Factor Emission Level Limits Margin Detector (MHz) (dBμV) (dB) (dBμV/m) (dBμV/m) (dB) Type 2472 106.56 -5.65 100.91 114 -13.09 peak 2472 84.38 -5.65 78.73 94 -15.27 AVG 4944 54.65 -3.43 51.22 74 -22.78 peak 4944 43.22 -3.43 39.79 54 -14.21 AVG 7416 53.17 -0.75 52.42 74 -21.58 peak 7416 37.38 -0.75 36.63 54 -17.37 AVG Remark: Factor = Antenna Factor + Cable Loss – Pre-amplifier. Vertical: Frequency Meter Reading Factor Emission Level Limits Margin Detector (MHz) (dBμV) (dB) (dBμV/m) (dBμV/m) (dB) Type 2472 106.09 -5.65 100.44 114 -13.56 peak 2472 85.27 -5.65 79.62 94 -14.38 AVG 4944 55.22 -3.43 51.79 74 -22.21 peak 4944 44.11 -3.43 40.68 54 -13.32 AVG 7416 52.24 -0.75 51.49 74 -22.51 peak 7416 38.85 -0.75 38.1 54 -15.9 AVG Remark: Factor = Antenna Factor + Cable Loss – Pre-amplifier. Remark： (1) Measuring frequencies from 1 GHz to the 25 GHz。 (2) “F” denotes fundamental frequency; “H” denotes spurious frequency. “E” denotes band edge frequency. (3) * denotes emission frequency which appearing within the Restricted Bands specified in provision of 15.205, then the general radiated emission limits in 15.209 apply. (4) Data of measurement within this frequency range shown “--- ” in the table above means the reading of emissions are attenuated more than 20dB below the permissible limits or the field strength is too small to be measured. (5) The IF bandwidth of EMI Test Receiver between 30MHz to 1GHz was 120KHz, 1 MHz for measuring above 1 GHz, below 30MHz was 10KHz. The resolution bandwidth of test receiver/spectrum analyzer is 1MHz and video bandwidth is 3MHz for peak measurement with peak detector at frequency above 1GHz. The resolution bandwidth of test receiver/spectrum analyzer is 1MHz and video bandwidth is 10Hz for Average measurement with peak detection at frequency above 1GHz. (6) When the test results of Peak Detected below the limits of Average Detected, the Average Detected is not need completed. For example: Top Channel at Fundamental 73.16dBuV/m(PK Value) <93.98(AV Limit), at harmonic 53.20 dBuV/m(PK Value) <54 dBuV/m(AV Limit), the Average Detected not need to completed. (7)All modes of operation were investigated and the worst-case emissions are reported.

Page 18 of 26 Report No.: HK1905201072E 5 BAND EDGE 5.1 Limits FCC PART 15.249(d) Emissions radiated outside of the specified frequency bands, except for harmonics, shall be attenuated by at least 50 dB below the level of the fundamental or to the general radiated emission limits in §15.209, whichever is the lesser attenuation. 5.2 Test Procedure The band edge compliance of RF radiated emission should be measured by following the guidance in ANSI C63.10 with respect to maximizing the emission by rotating the EUT, measuring the emission while the EUT is situated in three orthogonal planes (if appropriate), adjusting the measurement antenna height and polarization etc. Set RBW to 100KHz and VBM to 300KHz to measure the peak field strength and set RBW to 1MHz and VBW to 10Hz to measure the average radiated field strength.The conducted RF band edge was measured by using a spectrum analyzer. Set span wide enough to capture the highest in-band emission and the emission at the band edge. Set RBW to 100 KHz and VBW to 300 KHz, to measure the conducted peak band edge.

Page 19 of 26 Report No.: HK1905201072E 5.3 Test Result PASS Radiated Band Edge Test: Operation Mode: TX CH Low (2406MHz) Horizontal (Worst case) Frequency Meter Reading Factor Emission Level Limits Margin Detector Type (MHz) (dBμV) (dB) (dBμV/m) (dBμV/m) (dB) 2310 58.28 -5.81 52.47 74 -21.53 peak 2310 / -5.81 / 54 / AVG 2390 55.22 -5.84 49.38 74 -24.62 peak 2390 / -5.84 / 54 / AVG 2400 53.92 -5.84 48.08 74 -25.92 peak 2400 / -5.84 / 54 / AVG Remark: Factor = Antenna Factor + Cable Loss – Pre-amplifier. Vertical: Frequency Meter Reading Factor Emission Level Limits Margin Detector Type (MHz) (dBμV) (dB) (dBμV/m) (dBμV/m) (dB) 2310 56.76 -5.81 50.95 74 -23.05 peak 2310 / -5.81 / 54 / AVG 2390 54.37 -5.84 48.53 74 -25.47 peak 2390 / -5.84 / 54 / AVG 2400 52.48 -5.84 46.64 74 -27.36 peak 2400 / -5.84 / 54 / AVG Remark: Factor = Antenna Factor + Cable Loss – Pre-amplifier.

Page 20 of 26 Report No.: HK1905201072E Operation Mode: TX CH High (2472MHz) Horizontal (Worst case) Frequency Reading Result Factor Emission Level Limits Margin Detector Type (MHz) (dBμV) (dB) (dBμV/m) (dBμV/m) (dB) 2483.50 54.11 -5.65 48.46 74 -25.54 peak 2483.50 / -5.65 / 54 / AVG 2500.00 53.52 -5.65 47.87 74 -26.13 peak 2500.00 / -5.65 / 54 / AVG Remark: Factor = Antenna Factor + Cable Loss – Pre-amplifier. Vertical: Frequency Reading Result Factor Emission Level Limits Margin Detector Type (MHz) (dBμV) (dB) (dBμV/m) (dBμV/m) (dB) 2483.50 55.29 -5.65 49.64 74 -24.36 peak 2483.50 / -5.65 / 54 / AVG 2500.00 53.75 -5.65 48.1 74 -25.9 peak 2500.00 / -5.65 / 54 / AVG Remark: Factor = Antenna Factor + Cable Loss – Pre-amplifier. Remark: All the other emissions not reported were too low to read and deemed to comply with FCC limit.

Page 21 of 26 Report No.: HK1905201072E 6 OCCUPIED BANDWIDTH MEASUREMENT 6.1 Test Setup Same as Radiated Emission Measurement 6.2 Test Procedure 1. The EUT was placed on a turn table which is 0.8m above ground plane. 2. Set EUT as normal operation. 3. Based on ANSI C63.10 section 6.9.2: RBW= 30KHz. VBW= 100 KHz, Span=4MHz. 4. The useful radiated emission from the EUT was detected by the spectrum analyser with peak detector. 6.3 Measurement Equipment Used Same as Radiated Emission Measurement 6.4 Test Result PASS 20dB Bandwidth Frequency Result (MHz) 2406 MHz 1.206 PASS 2438MHz 1.200 PASS 2472 MHz 1.198 PASS CH: 2406MHz

Page 22 of 26 Report No.: HK1905201072E CH: 2438MHz CH: 2472MHz

Page 23 of 26 Report No.: HK1905201072E 7 ANTENNA REQUIREMENT Standard Applicable For intentional device, according to FCC 47 CFR Section 15.203, an intentional radiator shall be designed to ensure that no antenna other than that furnished by the responsible party shall be used with the device. And according to FCC 47 CFR Section 15.249, if transmitting antennas of directional gain greater than 6dBi are used, the power shall be reduced by the amount in dB that the directional gain of the antenna exceeds 6dBi. Antenna Connected Construction The antenna used in this product is a Internal Antenna, The directional gains of antenna used for transmitting is 0dBi. ANTENNA

Page 24 of 26 Report No.: HK1905201072E 8 PHOTOGRAPH OF TEST 8.1 Conducted Emission

Page 25 of 26 Report No.: HK1905201072E 8.2 Radiated Emission

Page 26 of 26 Report No.: HK1905201072E 9 PHOTOS OF THE EUT Reference to the reporter : ANNEX A of external photos and ANNEX B of internal photos ---------End of test report---------


Document Created: 2019-06-18 17:16:58
Document Modified: 2019-06-18 17:16:58
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