OA8-M520DAMATEUR RADIO

AMATEUR RADIO AMATEUR RADIO. Note: Public can` not use this Amateur device. Scanning:136-174MHz,400-520MHz VHF Receiving:136-174MHz UHF Receiving:400-520MHz BT/BLE:2402-2480MHz GPS:1575.42MHz FM:76-108MHz Transmitting: 144-148MHz, 420-450MHz(Amateur Band) -10~+55 Federal Communications Commission (FCC) Statement This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation Note:This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide Reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate the receiving antenna. . Increase the separation between the equipment and receiver. . Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. . Consult the dealer or an experienced radio/TV technician for help. Warning: Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. RF exposure statement: This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment.This equipment should be installed and operated with minimum distance 40cm between the radiator&your body.

Quanzhou Chierda Electronic Telecom Co., Ltd. Add: No.8,Zi'an Road,Jiangnan High-tech Industrial Zone Licheng District, Quanzhou Fujian, China Tel: +86-0595-28828859 Fax: +86-0595-28828800 E-mail: [email protected] Date: 2026-03-19 To: FEDERAL COMMUNICATIONS COMMISSION Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Dear Sir/Madam, We, Quanzhou Chierda Electronic Telecom Co., Ltd., hereby authorize Bay Area Compliance Laboratories Corp.(Xiamen) to act as a laboratory for testing and test report generation for the following project(s): (Product name: AMATEUR RADIO, Model Name: M520D, AR-7800 FCC ID: OA8-M520D ) The product only support BT(GFSK,π/4-DQPSK,8DPSK), BLE(1M,2M), 144-148 MHz, 420-450MHz(Amateur Radio), 136-174MHz,400-520 MHz(Scanning), 136- 174MHz (VHF Receiving), 400-520 MHz(UHF Receiving), GPS:1575.42MHz, other functions has been shielded by software, and end user cannot activate them. Sincerely, Signature: Printed Name: Anna Wang Title: Manager

Quanzhou Chierda Electronic Telecom Co., Ltd. Add: No.8,Zi'an Road,Jiangnan High-tech Industrial Zone Licheng District, Quanzhou Fujian, China Tel: +86-0595-28828859 Fax: +86-0595-28828800 E-mail: [email protected] Attestation Letter Date:2026-03-19 FEDERAL COMMUNICATIONS COMMISSIONS Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Ref: Attestation Statements for Amateur TX Frequencies FCC ID: OA8-M520D Quanzhou Chierda Electronic Telecom Co., Ltd. (“the applicant”) certifies that the equipment for transmitter frequencies can be programmed for only amateur frequencies (420-450MHz, 144- 148MHz) Also, equipment programming is the responsibility of Authorized Service Personnel, in that the operator cannot directly program the transmit frequencies using the normally accessible external controls. Sincerely, Signature Contact Person: Anna Wang Title: Manager

Quanzhou Chierda Electronic Telecom Co., Ltd. Add: No.8,Zi'an Road,Jiangnan High-tech Industrial Zone Licheng District, Quanzhou Fujian, China Tel: +86-0595-28828859 Fax: +86-0595-28828800 E-mail: [email protected] Attestation Letter Date: 03/19/2025 FEDERAL COMMUNICATIONS COMMISSIONS Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Ref: Attestation Statements CFR 47 §2.911(d)(5)(i)(ii) Filing FCC ID: OA8-M520D Quanzhou Chierda Electronic Telecom Co., Ltd. (“the applicant”) certifies that the equipment for which authorization is sought is not “covered” equipment prohibited from receiving an equipment authorization pursuant to section 2.903 of the FCC rules. Quanzhou Chierda Electronic Telecom Co., Ltd. (“the applicant”) certifies that as of the date of the filing of the application, the applicant is not identified on the Covered List as an entity producing “covered” equipment. Quanzhou Chierda Electronic Telecom Co., Ltd. (“the applicant”) certifies that our product does not use Kaspersky's software information. Sincerely, Signature Contact Person: Anna Wang Title: Manager

U.S. AGENT LETTER OF ATTESTATION Date: 2026-03-19 FEDERAL COMMUNICATIONS COMMISSION Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Ref: Attestation Statements CFR 47 §2.911(d)(7) Filing FCC ID: OA8-M520D Quanzhou Chierda Electronic Telecom Co., Ltd. certifies that, as of the date of the filing of the application, Iconsigh is our designated U.S. agent for service of process for the above referenced FCC ID. Quanzhou Chierda Electronic Telecom Co., Ltd. accepts to maintain an agent for no less than one year after the grantee has terminated all marketing and importation or the conclusion of any Commission-related proceeding involving the equipment. Iconsigh accepts, as of the date of the filing of the application, the obligation of the designated U.S. agent for service of process for the above referenced FCC ID. Designated U.S. Agent Information: Company Name: Iconsigh Address: 2310 Homestead Road, Suite C1, Los Altos, CA, 94024, USA FRN: 0033398652 Tel.: +1 (408) 320-9867 Email: [email protected] Signed by (printed name): Benjamin Kaur Signature: Applicant: Quanzhou Chierda Electronic Telecom Co., Ltd. Address: No.8,Zi'an Road,Jiangnan High-tech Industrial Zone Licheng District, Quanzhou Fujian, China FRN: 0021687819 Tel: +86-0595-28828859 Email: [email protected] Signed by (printed name): Anna Wang Signature:

QA-FR-170-B Quanzhou Chierda Electronic Telecom Co., Ltd. Add: No.8,Zi'an Road,Jiangnan High-tech Industrial Zone Licheng District, Quanzhou Fujian, China Tel: +86-0595-28828859 Fax: +86-0595-28828800 E-mail: [email protected] FCC Authorization Date: 2026-03-19 FEDERAL COMMUNICATIONS COMMISSION Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Subject: Agent Authorization To whom it may concern: We , Quanzhou Chierda Electronic Telecom Co., Ltd., Hereby authorizes Bay Area Compliance Laboratories Corp. (Xiamen) to act on its behalf in all matters relating to application for Equipment authorization, including the signing of all documents relating to these matters. All acts carried out by Bay Area Compliance Laboratories Corp. (Xiamen) on our behalf shall have the same effect as our own action. We, the undersigned, hereby certify that we are not subject to a denial of federal benefits, that includes FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C. 862. This authorization is valid until further written notice from the applicant. Sincerely Yours, Client’s signature Contact Person: Anna Wang Title: Manager

QA-FR-171-A Quanzhou Chierda Electronic Telecom Co., Ltd. Add: No.8,Zi'an Road,Jiangnan High-tech Industrial Zone Licheng District, Quanzhou Fujian, China Tel: +86-0595-28828859 Fax: +86-0595-28828800 E-mail: [email protected] FCC Confidential Authorization Date: 2026-03-19 FEDERAL COMMUNICATIONS COMMISSIONS Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Subject: Confidentiality Request regarding application for certification of FCC ID: OA8-M520D In accordance with Sections 0.457 and 0.459 of the Commission’s Rules, Quanzhou Chierda Electronic Telecom Co., Ltd. hereby requests long-term confidential treatment of information accompanying this application as outlined below:  Block Diagram  Schematics  Operation Description  Internal Photos The above materials contain proprietary and confidential information not customarily released to the public. The public disclosure of these materials provides unjustified benefits to its competitors in the market. Sincerely, Signature: Contact Person: Anna Wang Title: Manager

Quanzhou Chierda Electronic Telecom Co., Ltd. Add: No.8,Zi'an Road,Jiangnan High-tech Industrial Zone Licheng District, Quanzhou Fujian, China Tel: +86-0595-28828859 Fax: +86-0595-28828800 E-mail: [email protected] DECLARATION OF SIMILARITY Date: 2025-11-04 FEDERAL COMMUNICATIONS COMMISSION Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Dear Sir or Madam: We, Quanzhou Chierda Electronic Telecom Co., Ltd., hereby declare that the product: AMATEUR RADIO, FCC ID: OA8-M520D. model: AR-7800 are electrically identical with the model: M520D which was tested by Bay Area Compliance Laboratories Corp. (Xiamen) with the same electromagnetic emissions and electromagnetic compatibility characteristics. A description of the differences between those models and that are declared similar are as follows: They are the same product, just different model name and color,the rest are the same. Please contact me should there be need for any additional clarification or information. Best Regards, Signature: Printed name: Anna Wang Title: Manager

Bay Area Compliance Laboratories Corp. (Xiamen) Report No.: 2507Z03677E-EM-EXP Page 1 / 11 EUT EXTERNAL PHOTOS M520D Bay Area Compliance Laboratories Corp. (Xiamen) Report No.: 2507Z03677E-EM-EXP Page 2 / 11 Bay Area Compliance Laboratories Corp. (Xiamen) Report No.: 2507Z03677E-EM-EXP Page 3 / 11 Bay Area Compliance Laboratories Corp. (Xiamen) Report No.: 2507Z03677E-EM-EXP Page 4 / 11 Bay Area Compliance Laboratories Corp. (Xiamen) Report No.: 2507Z03677E-EM-EXP Page 5 / 11 Bay Area Compliance Laboratories Corp. (Xiamen) Report No.: 2507Z03677E-EM-EXP Page 6 / 11 AR-7800 Bay Area Compliance Laboratories Corp. (Xiamen) Report No.: 2507Z03677E-EM-EXP Page 7 / 11 Bay Area Compliance Laboratories Corp. (Xiamen) Report No.: 2507Z03677E-EM-EXP Page 8 / 11 Bay Area Compliance Laboratories Corp. (Xiamen) Report No.: 2507Z03677E-EM-EXP Page 9 / 11 Bay Area Compliance Laboratories Corp. (Xiamen) Report No.: 2507Z03677E-EM-EXP Page 10 / 11 Bay Area Compliance Laboratories Corp. (Xiamen) Report No.: 2507Z03677E-EM-EXP Page 11 / 11

FCC§15.247 (i), §1.1307(b)(1) & §2.1091 Page 1 of 13 RF EXPOSURE REPORT For Quanzhou Chierda Electronic Telecom Co., Ltd. No.8,Zi'an Road,Jiangnan High-tech Industrial Zone Licheng District, Quanzhou Fujian, China FCC ID: OA8-M520D Report Type: Original Report Product Name: AMATEUR RADIO Report Number: 2507Z03677E-RF-04 Report Date: 2026-06-13 Reviewed By: Ash Lin Approved By: Miles Chen Prepared By : Bay Area Compliance Laboratories Corp. (Xiamen) Unit 102, No. 902 Meifeng South Road, Binhai West Avenue Science and Technology Innovation Park, Torch High Tech Zone Xiamen, People's Republic of China Tel: +86-592-3200111 www.baclcorp.com.cn Bay Area Compliance Laboratories Corp. (Xiamen) Report No.: 2507Z03677E-RF-04 FCC§15.247 (i), §1.1307(b)(1) & §2.1091 Page 2 of 13 TABLE OF CONTENTS REPORT REVISION HISTORY................................................................................................................................. 3 GENERAL INFORMATION ....................................................................................................................................... 4 PRODUCT DESCRIPTION FOR EQUIPMENT UNDER TEST (EUT) ..................................................................................... 4 TEST EQUIPMENT LIST ........................................................................................................................................... 5 FCC§15.247 (i), §1.1307(b)(1) & §2.1091 – MAXIMUM PERMISSIBLE EXPOSURE (MPE) ............................ 6 APPLICABLE STANDARD .............................................................................................................................................. 6 CALCULATED FORMULARY: ......................................................................................................................................... 6 MPE TEST PROCEDURE ............................................................................................................................................... 6 BLOCK DIAGRAM OF TEST SETUP ................................................................................................................................ 7 TEST DATA .................................................................................................................................................................. 7 EUT PHOTOGRAPHS ............................................................................................................................................... 11 Bay Area Compliance Laboratories Corp. (Xiamen) Report No.: 2507Z03677E-RF-04 FCC§15.247 (i), §1.1307(b)(1) & §2.1091 Page 3 of 13 REPORT REVISION HISTORY Number of Revisions Report No. Version Issue Date Description 0 2507Z03677E-RF-04 R1V1 2026-06-13 Initial Release Bay Area Compliance Laboratories Corp. (Xiamen) Report No.: 2507Z03677E-RF-04 FCC§15.247 (i), §1.1307(b)(1) & §2.1091 Page 4 of 13 GENERAL INFORMATION Product Description for Equipment under Test (EUT) Applicant: Quanzhou Chierda Electronic Telecom Co., Ltd. Product Name: AMATEUR RADIO Tested Model: M520D Multiple Model(s): AR-7800 Trade Mark: Chierda, ABBREE Power Supply: DC 13.8V from DC Source EUT Received Status: Good Note: 1. The Maximum Antenna Gain was declared by manufacturer. 2. The difference between tested model and series model are model name and color, please refer to declaration letter for more detail. 3. The EUT supplied by the applicant was received on 2025-11-04. Test Facility The Test site used by Bay Area Compliance Laboratories Corp. (Xiamen) to collect test data is located on the Unit 102, No. 902 Meifeng South Road, Binhai West Avenue, Science and Technology Innovation Park, Torch High tech Zone XiaMen. Bay Area Compliance Laboratories Corp. (Xiamen) Lab is accredited to ISO/IEC 17025 by A2LA (Certificate Number: 7134.01) and the lab has been recognized as the FCC accredited lab under the KDB 974614 D01, the FCC Designation No. : CN1384. Bay Area Compliance Laboratories Corp. (Xiamen) Report No.: 2507Z03677E-RF-04 FCC§15.247 (i), §1.1307(b)(1) & §2.1091 Page 5 of 13 TEST EQUIPMENT LIST Test Equipment Manufacturer Model Serial Number Calibration Date Calibration Due Date Broadband Field Mete r narda NBM-550 E-0696 2024/9/13 2027/9/12 E-Field probe narda EF 0391 D-1748 2024/9/13 2027/9/12 * Statement of Traceability: Bay Area Compliance Laboratories Corp. (Xiamen) attests that all calibrations have been performed in accordance to requirements that traceable to National Primary Standards and International System of Units (SI). Bay Area Compliance Laboratories Corp. (Xiamen) Report No.: 2507Z03677E-RF-04 FCC§15.247 (i), §1.1307(b)(1) & §2.1091 Page 6 of 13 FCC§15.247 (i), §1.1307(b)(1) & §2.1091 – MAXIMUM PERMISSIBLE EXPOSURE (MPE) Applicable Standard According to FCC §1.1307(b)(1) & §2.1091, systems operating under the provisions of this section shall be operated in a manner that ensure that the public is not exposed to radio frequency energy level in excess of the Commission’s guideline. Limits for Maximum Permissible Exposure (MPE) f = frequency in MHz; * = Plane-wave equivalent power density. Calculated Formulary: Predication of MPE limit at a given distance S = PG/4πR² = power density (in appropriate units, e.g. mW/cm 2 ); P = power input to the antenna (in appropriate units, e.g., mW); G = power gain of the antenna in the direction of interest relative to an isotropic radiator, the power gain factor, is normally numeric gain; R = distance to the center of radiation of the antenna (appropriate units, e.g., cm); For simultaneously transmit system, the calculated power density should comply with: MPE Test Procedure 1. Place the EUT`s antenna was vertical polarization on the table. 2. The EUT was set to transmit at the frequency at maximum RF power. 3. The Distance between the test probe and the investigated EUT`s antenna equal to the distance be specified as safety distance in the user manual. 4. Power density measurements were taken at differen…

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FCC Part 15.247 Page 1 of 108 FCC PART 15.247 TEST REPORT For Quanzhou Chierda Electronic Telecom Co., Ltd. No.8,Zi'an Road,Jiangnan High-tech Industrial Zone Licheng District, Quanzhou Fujian, China FCC ID: OA8-M520D Report Type: Original Report Product Name: AMATEUR RADIO Report Number: 2507Z03677E-RF-03 Report Date: 2026-06-13 Reviewed By: Ash Lin Approved By: Miles Chen Prepared By : Bay Area Compliance Laboratories Corp. (Xiamen) Unit 102, No. 902 Meifeng South Road, Binhai West Avenue Science and Technology Innovation Park, Torch High Tech Zone Xiamen, People's Republic of China Tel: +86-592-3200111 www.baclcorp.com.cn Bay Area Compliance Laboratories Corp. (Xiamen) Report No.: 2507Z03677E-RF-03 FCC Part 15.247 Page 2 of 108 TABLE OF CONTENTS REPORT REVISION HISTORY................................................................................................................................. 4 GENERAL INFORMATION ....................................................................................................................................... 5 PRODUCT DESCRIPTION FOR EQUIPMENT UNDER TEST (EUT) ..................................................................................... 5 OBJECTIVE ................................................................................................................................................................... 5 TEST METHODOLOGY .................................................................................................................................................. 5 TEST FACILITY ............................................................................................................................................................. 6 MEASUREMENT UNCERTAINTY .................................................................................................................................... 6 SYSTEM TEST CONFIGURATION .......................................................................................................................... 7 TEST MODE AND VOLTAGE .......................................................................................................................................... 7 DESCRIPTION OF TEST CONFIGURATION ...................................................................................................................... 7 ★EUT EXERCISE SOFTWARE ...................................................................................................................................... 7 SPECIAL ACCESSORIES ................................................................................................................................................. 7 EQUIPMENT MODIFICATIONS ....................................................................................................................................... 7 SUPPORT EQUIPMENT LIST AND DETAILS .................................................................................................................... 8 EXTERNAL I/O CABLE .................................................................................................................................................. 8 BLOCK DIAGRAM OF TEST SETUP ................................................................................................................................ 8 SUMMARY OF TEST RESULTS ............................................................................................................................. 10 TEST EQUIPMENT LIST ......................................................................................................................................... 11 FCC §15.203 – ANTENNA REQUIREMENT .......................................................................................................... 12 APPLICABLE STANDARD ............................................................................................................................................ 12 ANTENNA CONNECTOR CONSTRUCTION .................................................................................................................... 12 FCC §15.205, §15.209 & §15.247(d) – RADIATED EMISSIONS ........................................................................... 13 APPLICABLE STANDARD ............................................................................................................................................ 13 TEST SYSTEM SETUP .................................................................................................................................................. 13 EMI TEST RECEIVER & SPECTRUM ANALYZER SETUP .............................................................................................. 15 FINAL MEASUUREMENT FOR EMISSION IDENTIFED DING THE PRE-SCAN: .................................................................... 15 TEST PROCEDURE ...................................................................................................................................................... 15 RESULT &MARGIN CALCULATION ............................................................................................................................. 16 TEST DATA ................................................................................................................................................................ 17 FCC §15.247(a) (1) –CHANNEL SEPARATION TEST .......................................................................................... 74 APPLICABLE STANDARD ............................................................................................................................................ 74 EUT SETUP ................................................................................................................................................................ 74 TEST PROCEDURE ...................................................................................................................................................... 74 TEST DATA ......…

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根通通信技术有限公司 GentongCommunicationTechnologyCo.,Ltd 地址:泉州市南安国家大学科学园福建分园七号楼五层 根通通信技术有限公司 Address: 5th Floor, Building 7, Fujian Branch, Nan 'an National University Science Park, Taizhou City Antenna Type:PCB Antenna Model name:M520D Frequency Range:2402~2480MHz Antenna Gain:-0.9dBi 1. Passive test fixture Objective: To test the passive parameters of the antenna as accurately as possible. The manufacturing method: The manual machine tool uses a 50-ohm coaxial cable. One end is connected to the test point at the rear end of the matching circuit on the mobile phone's mainboard (the front end of the RF test hole), and the other end is connected to the SMA connector. The schematic diagram is as follows: 2.S11 test S11 Test Method Description Test equipment: Network analyzer (Agilent 8753D) Test method: Export a 50-ohm CABLE from the instrument's test port, calibrate it with a calibration piece, and then connect it to the SMA connector of the manual mechanism. Record the return loss and standing wave ratio corresponding to the relevant frequency points 根通通信技术有限公司 GentongCommunicationTechnologyCo.,Ltd 3 S11 parameters Antenna photo Frequency: 2402MHz, Gain:-1.55dBi Frequency: 2441MHz, Gain:-2.31dBi Frequency: 2480MHz, Gain:-0.9dBi

Bay Area Compliance Laboratories Corp. (Xiamen) Report No.: 2507Z03677E-RF-TSP-02 Page 1 / 4 EUT SETUP PHOTOS Radiation Emission View (9kHz~30MHz) Radiation Emission - Front View (Below 1GHz) Bay Area Compliance Laboratories Corp. (Xiamen) Report No.: 2507Z03677E-RF-TSP-02 Page 2 / 4 Radiation Emission - Back View (Below 1GHz) Radiation Emission - Front View (1GHz-18GHz) Bay Area Compliance Laboratories Corp. (Xiamen) Report No.: 2507Z03677E-RF-TSP-02 Page 3 / 4 Radiation Emission - Back View (1GHz-18GHz) Radiation Emission - Front View (Above 18GHz) Bay Area Compliance Laboratories Corp. (Xiamen) Report No.: 2507Z03677E-RF-TSP-02 Page 4 / 4 Radiation Emission - Back View (Above 18GHz)

Bay Area Compliance Laboratories Corp. (Xiamen) Report No.: 2507Z03677E-RF-TSP-03 Page 1 / 1 EUT SETUP PHOTOS RF Exposure measurements