Y9M-KA040EPMR digital transceiver/repeater

Radio Activity S.r.l. Via privata Cascia, 11 - 20128 Milano- Italy – email: [email protected] - www.radioactivity-tlc.com Tel. +39.02.36514205 - FAX/Voicebox +39.1782.242408 - CCIAA Milano N° 1728248 - VAT Id. 04135130963 KAIROS enhanced User Manual Version 1.1 Radio Activity S.r.l. 2 / 37 Summary 1 FOREWORD ..................................................................................................................................... 7 1.1 LOCAL LAWS RESTRICTIONS ........................................................................................................................ 7 1.2 DOCUMENT COPYRIGHTS .......................................................................................................................... 7 1.3 DISCLAIMER ............................................................................................................................................ 7 1.4 MODIFICATIONS ...................................................................................................................................... 7 2 PRODUCT SAFETY ............................................................................................................................ 8 2.1 RF EXPOSURE COMPLIANCE ...................................................................................................................... 8 2.2 IMPROPER USE ........................................................................................................................................ 9 2.3 POWER SUPPLY ....................................................................................................................................... 9 2.4 ANTENNA SYSTEM / LIGHTNING .................................................................................................................. 9 3 RADIO DESCRIPTION ...................................................................................................................... 10 3.1 FRONTAL PANEL .................................................................................................................................... 10 3.2 REAR PANEL .......................................................................................................................................... 12 3.2.1 RX inputs specifications ............................................................................................................. 12 3.2.2 TX output specifications ............................................................................................................. 14 3.2.3 GPS antenna .............................................................................................................................. 15 3.2.4 Power supply .............................................................................................................................. 18 3.2.5 I/O ports ..................................................................................................................................... 19 4 INSTALLATION AND MAINTENANCE ............................................................................................... 22 4.1 IMPROPER USE ...................................................................................................................................... 22 4.2 THERMAL DISSIPATION............................................................................................................................ 22 4.3 POWER SUPPLY SYSTEM .......................................................................................................................... 23 4.4 ANTENNA ............................................................................................................................................. 23 4.4.1 Maximum permitted antenna gain for mobile usage ................................................................ 23 4.4.2 Maximum permitted antenna gain for fixed usage ................................................................... 24 Radio Activity S.r.l. 3 / 37 4.5 AF INTERFACE ....................................................................................................................................... 24 4.6 MANUAL SETTINGS ................................................................................................................................ 24 4.7 SELF-TEST PROCESS ................................................................................................................................ 24 4.8 PPS SIGNAL .......................................................................................................................................... 24 4.9 ON SITE CHECK LIST ................................................................................................................................ 24 4.10 IP DISCOVER ...................................................................................................................................... 26 4.11 PREVENTIVE MAINTENANCE ................................................................................................................ 26 5 PARAMETERS CONFIGURATION AND REMOTE CONTROL ................................................................ 27 5.1 GATEWAY FOR DIGITAL CONSOLE .............................................................................................................. 27 6 ENGINEERING SPECIFICATIONS ...................................................................................................... 28 6.1 KAE MAIN SPECIFICATIONS ...................................................................................................................... 28 6.2 RADIO FREQUENCY ................................................................................................................................. 29 6.2.1 Transmitter ................................................................................................................................ 29 6.2.2 Receiver .....................................…

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Radio Activity srl Via Privata Cascia, 11 • 20128 Milano, Italy • e-mail: [email protected] / PEC: [email protected] Tel. +39.02.36514205 • Società a socio unico • CCIAA Milano N° 1728248 VAT IT 04135130963 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 04-14-2026 Ref: Attestation Statements Part 2.911(d)(5)(i) Filing FCC ID: Y9M-KA040E Radio Activity srl (“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. Radio Activity srl (“the applicant”) certifies that the equipment for which authorization is sought does not include cybersecurity or anti-virus software produced or provided by Kaspersky Lab, Inc. or any of its successors and assignees, including equipment with integrated Kaspersky Lab, Inc. (or any of its successors and assignees) cybersecurity or anti-virus software pursuant to DA-24-886 and KDB 986446 D01 Covered Equipment Guidance section B(2a). Device is inherently compliant based on hardware limitations or software controls. or A Software Bill of Materials (SBOM) is provided to the TCB for review, and The end-user or third parties cannot install additional software on this device. Sincerely, Mauro Campidofglio Radio Activity S.r.l. 2 / 2 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 04-14-2026 Ref: Attestation Statements Part 2.911(d)(5)(ii) Filing FCC ID: Y9M-KA040E Radio Activity srl (“the applicant”) certifies that, as of the date of the filing of the application, the applicant is not identified on the Covered List (as a specifically named entity or any of its subsidiaries or affiliates) as an entity producing “covered” equipment. Sincerely, Mauro Campidofglio

Radio Activity srl Via Privata Cascia, 11 • 20128 Milano, Italy • e-mail: [email protected] / PEC: [email protected] Tel. +39.02.36514205 • Società a socio unico • CCIAA Milano N° 1728248 VAT IT 04135130963 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 06-16-2026 Ref: Attestation Statements Part 2.911(d)(7) Filing FCC ID: Y9M-KA040E Applicant FRN: 0020595484 Radio Activity srl (“the applicant”) certifies that, as of the date of the filing of the application, EF JOHNSON COMPANY is our designated U.S. agent for service of process for the above referenced FCC ID. Radio Activity srl 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. EF JOHNSON COMPANY 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: Name: EF JOHNSON COMPANY U.S. Agent FRN: 0004201521 Address: 1440 Corporate Drive, Irving, TX 75038 Contact Person: Mr. Viet Vu Tel.: 972.819.0700 Email: [email protected] Sincerely, Radio Activity srl EF JOHNSON COMPANY Mauro Campidoglio Mr. Viet Vu

Radio Activity srl Via Privata Cascia, 11 • 20128 Milano, Italy • e-mail: [email protected] / PEC: [email protected] Tel. +39.02.36514205 • Società a socio unico • CCIAA Milano N° 1728248 VAT IT 04135130963 Federal Communications Commission Authorization and Evaluation Division Confidentiality Request regarding application for certification of FCC ID: Y9M-KA040E Pursuant to Sections 0.457 and 0.459 of the Commission’s Rules, we hereby request confidential treatment of information accompanying this application as outlined below: Exhibit Type File Name Block diagram Schematic diagram Parts list and BOM KA-040E_block diagram.pdf RA072-schematic.pdf SCH0072-KA20100_BOM.pdf; SCH0072-KA20100_mpntaggio_TOP.pdf; SCH0072-KA20100_mopntaggio_BOT.pdf The above materials contain trade secrets and proprietary information not customarily released to the public. The public disclosure of these materials may be harmful to the applicant and provide unjustified benefits to its competitors. The applicant understands that pursuant to Section 0.457 of the Rules, disclosure of this application and all accompanying documentation will not be made before the date of the Grant for this application. Sincerely, Mauro Campidofglio

TradeMark address Limitations Recycling information Type/Model «CE» marking Powersupplydata Trademark KA-10327 Serial number

Via privata Cascia, 11 - 20128 Milano- Italy – email: [email protected] - www.radioactivity-tlc.com Tel. +39.02.36514205 - FAX/Voicebox +39.1782.242408 - CCIAA Milano N° 1728248 - VAT Id. 04135130963 ______________________________________________________________________________ _______________________________________________________________________________ KA-040e – Ver 1.0 Page 1 / 13 REVISION SUMMARY: Number Date Main modifications to previous version Ver 1.0 04/14/2026 First edition ....... ....... ....... KA-040e circuit description Version 1.0 – 04/14/2026 KA-450e Via privata Cascia, 11 - 20128 Milano- Italy – email: [email protected] - www.radioactivity-tlc.com Tel. +39.02.36514205 - FAX/Voicebox +39.1782.242408 - CCIAA Milano N° 1728248 - VAT Id. 04135130963 _______________________________________________________________________________ _______________________________________________________________________________ KA-450e – Ver 1.0 Page 2 / 13 Summary 1 GENERAL DESCRIPTION.................................................................................................................... 3 2 PRODUCT IDENTIFICATION .............................................................................................................. 4 3 PRODUCT DESCRIPTION ................................................................................................................... 5 3.1 RECEIVER SYSTEM ............................................................................................................................... 6 3.1.1 FRONT-END .................................................................................................................................. 6 3.1.2 FIRST MIXER ................................................................................................................................. 7 3.1.3 IF CIRCUIT ..................................................................................................................................... 7 3.2 TRANSMITTER SYSTEM ........................................................................................................................ 7 3.2.1 DRIVER AND FINAL AMPLIFIER .................................................................................................... 7 3.2.2 CM COUPLER CIRCUIT .................................................................................................................. 8 3.2.3 CURRENT CONTROL CIRCUIT........................................................................................................ 8 3.2.4 HIGH TEMPERATURE DETECTOR CIRCUIT .................................................................................... 8 3.3 PLL SYSTEM ......................................................................................................................................... 8 3.3.1 RECEIVER PLL CIRCUIT .................................................................................................................. 8 3.3.2 TRANSMITTER PLL CIRCUIT .......................................................................................................... 9 3.4 LOGIC BOARD: CONTROL SYSTEM ..................................................................................................... 10 3.4.1 MCU ........................................................................................................................................... 10 3.4.2 DSP ............................................................................................................................................. 11 3.4.3 FPGA ........................................................................................................................................... 11 3.5 RADIO MODULES ............................................................................................................................... 12 3.6 POWER SUPPLY ................................................................................................................................. 12 Via privata Cascia, 11 - 20128 Milano- Italy – email: [email protected] - www.radioactivity-tlc.com Tel. +39.02.36514205 - FAX/Voicebox +39.1782.242408 - CCIAA Milano N° 1728248 - VAT Id. 04135130963 _______________________________________________________________________________ _______________________________________________________________________________ KA-450e – Ver 1.0 Page 3 / 13 1 GENERAL DESCRIPTION KAIROS enhanced (KAe) is an evolution of the KAIROS transceiver, which is multi-protocol analog and digital transceiver, intended for both stand-alone and network application. The previous series has been completely renewed, in terms of components, performances and applications and a new look has been designed, keeping the same overall shape of its previous model. KAe transceiver is a professional software defined radio station, based on a LINUX logic core. It is a building block for a number of applications ranging from a simple standalone repeater to a national wide network system, thanks to its extreme flexibility. KAe transceiver embeds on a single boards a logic core, including microprocessor, DSP and PLD, a digital transmitter with output power up to 40W, a double receiver, for space diversity reception, a GPS module for synchronization, an audio interface, both digital over IP and analog over 4 wire line. Main characteristics: Model KA-040e MHz 39-50 Channel spacing 25/20/12,5/6,25 kHz RF output power 1-40 W / 100% duty cycle / selectable per channel Synthesis step 50Hz Frequency stability 0,1 p.p.m. Synchronization sources Internal ref., GPS/GLONASS, Ethernet IEE-1588v2, 2 wire, Digital RX, External Operating temperature -30°C ÷ +60°C Power supply (negative ground) Min. Typ. Max. 10,8V 13,2V 15,6V Power consumption TX: 100 W @40W RF / RX: 6 W Dimensions & weight 160x200x45mm / 1.5kg Audio lines 2x 4 wires + E&M, RTP over IP LAN port Ethernet 10/100/1000 (auto MDI/MDI X) on an RJ45 socket Via privata Cascia, 11 - 2…

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Test Report# TR_27537-26_FCC 1.1310_MPE_1 Revision: 5 Test Report - FCC Part 1.1310/ MPE Applicant: Radio Activity srl Signature: Name & Title: Tim Royer, Lab Manager Date of Signature 2026-06-06 Signature: Name & Title: Osvaldo Fernandez, Test Technician Date of Signature 2026-06-06 Prepared By: Mark Learner, Technical Writer This test report relates only to the items tested as identified and is not valid for any subsequent changes or modifications made to the equipment under test. 13146 NW 86 th Drive, Suite 400, Alachua, Florida 32615 (352) 472-5500 / [email protected] Page 2 of 9 This test report shall not be reproduced except in full without the written and signed permission of Timco Engineering Inc., a subsidiary of Industrial Inspection & Analysis, Inc. (IIA). Table of Contents 1. APPLICANT INFORMATION ........................................................................................................................................................................... 3 2. LOCATION OF TESTING ................................................................................................................................................................................. 3 2.1 TEST LABORATORY ................................................................................................................................................................. 3 3. TEST SAMPLE(S) (EUT/DUT) ........................................................................................................................................................................... 3 3.1 DESCRIPTION OF THE EUT ...................................................................................................................................................... 4 4. TEST METHODS & APPLICABLE REGULATORY LIMITS ............................................................................................................................ 5 4.1 TEST METHODS/STANDARDS/GUIDANCE: ................................................................................................................................ 5 4.1.1 FCC Limits for Maximum Permissible Exposure (MPE) ......................................................................................... 5 4.2 EQUATIONS ........................................................................................................................................................................... 6 5. RF EXPOSURE RESULTS .................................................................................................................................................................................. 7 6. HISTORY OF TEST REPORT CHANGES ........................................................................................................................................................ 8 13146 NW 86 th Drive, Suite 400, Alachua, Florida 32615 (352) 472-5500 / [email protected] Page 3 of 9 This test report shall not be reproduced except in full without the written and signed permission of Timco Engineering Inc., a subsidiary of Industrial Inspection & Analysis, Inc. (IIA). 1. Applicant Information Applicant: RADIO ACTIVITY S.R.L Address: VIA PRIVATA CASCIA, 11, MILANO, 20128 ITA 2. Location of Testing 2.1 Test Laboratory Timco Engineering Inc. is a subsidiary of Industrial Inspection & Analysis, Inc. (“IIA”). Testing was performed at IIA’s permanent laboratory located at 13146 NW 86 th Drive, Suite 400, Alachua, Florida 32615. FCC test firm # 578780 FCC Designation # US1070 FCC site registration is under A2LA certificate # 0955.01 CAB identifier number #US0111 ISED Canada test site registration # 2056A EU Notified Body # 1177 For all designations see A2LA scope # 0955.01 3. Test Sample(s) (EUT/DUT) The test sample was received: 2026-04-21 Dates of Testing: 2026-04-25 – 2026-05-29 13146 NW 86 th Drive, Suite 400, Alachua, Florida 32615 (352) 472-5500 / [email protected] Page 4 of 9 This test report shall not be reproduced except in full without the written and signed permission of Timco Engineering Inc., a subsidiary of Industrial Inspection & Analysis, Inc. (IIA). 3.1 Description of the EUT A description as well as unambiguous identification of the EUT(s) tested. Where more than one sample is required for technical reasons (such as the use of connected units for the purpose of conducted output power testing where the product units will have integral antennas), each specific test shall identify which unit was tested. Identification FCC ID: Y9M-KA040E Brief Description PMR digital transceiver/repeater Model(s) # KA-040e Firmware version - Software version - Serial Number - Technical Characteristics Frequency Range 39-50MHz RF O/P Power (Max.) Rated 1 to 50W Modulation FM/PM (12.5-20-25kHz), 4FSK, C4FM Bandwidth & Emission Class 11K0F3E, 11K0G3E, 14K0F3E, 14K0G3E, 16K0F3E, 16K0G3E, 8K10F1E, 8K10F1D, 7K60FXE, 7K60FXD Number of Channels 1 working channel (2 logical channels for DMR); up to 200 programmable channels Duty Cycle Up to 100% Antenna Connector SMA Voltage Rating (AC or Batt.) 13.2Vdc, negative to GND, 10A max Antenna Characteristics Antenna Frequency Range Mode / BW Antenna Gain 1 39-50MHz N/A Max allowed per manufacturer 6 dBi - Note: Information such as antenna gain, firmware/software numbers are provided by manufacturer and cannot be validated by the test lab. 13146 NW 86 th Drive, Suite 400, Alachua, Florida 32615 (352) 472-5500 / [email protected] Page 5 of 9 This test report shall not be reproduced except in full without the written and signed permission of Timco Engineering Inc., a subsidiary of Industrial Inspection & Analysis, Inc. (IIA). 4. Test methods & Applicable Regulatory Limits 4.1 Test methods/Standards/Guidance: The following guidance FCC KDB 447498 D01 General RF Exposure Guidance v06 was used for RF exposure evaluation as per FCC Part 1.1310 and FCC Part 2.1091 and part 2.1093. Full test results are available in this report. 4.1.1 FCC …

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Test Report# TR_27537-26_FCC 90_1 Revision: 4 Test Report - FCC Part 90 Applicant: Radio Activity srl Signature: Name & Title: Tim Royer, Lab Manager Date of Signature 2026-06-06 Signature: Name & Title: Osvaldo Fernandez, Test Technician Date of Signature 2026-06-06 Prepared By: Mark Learner, Technical Writer This test report relates only to the items tested as identified and is not valid for any subsequent changes or modifications made to the equipment under test. 13146 NW 86 th Drive, Suite 400, Alachua, Florida 32615 (352) 472-5500 / [email protected] Page 2 of 66 This test report shall not be reproduced except in full without the written and signed permission of IIA Lab Services LLC. a subsidiary of Industrial Inspection & Analysis, Inc. (“IIA”) Table of Contents 1. APPLICANT INFORMATION ...................................................................................................................................................... 4 1.1 PART 90 TEST RESULT SUMMARY ....................................................................................................................................................................... 4 2. LOCATION OF TESTING ............................................................................................................................................................ 5 2.1 TEST LABORATORY .............................................................................................................................................................................................. 5 3. TEST SAMPLE(S) (EUT/DUT) ...................................................................................................................................................... 5 3.1 DESCRIPTION OF THE EUT .................................................................................................................................................................................. 6 3.2 CONFIGURATION OF EUT ....................................................................................................................................................................................7 3.3 TEST SETUP OF EUT .............................................................................................................................................................................................7 4. TEST METHODS & APPLICABLE REGULATORY LIMITS ....................................................................................................... 8 4.1 TEST METHODS/STANDARDS/GUIDANCE: .......................................................................................................................................................... 8 4.2 APPLIED LIMITS AND REGULATORY LIMITS: ......................................................................................................................................................... 8 5. MEASUREMENT UNCERTAINTY ............................................................................................................................................... 8 6. ENVIRONMENTAL CONDITIONS ............................................................................................................................................ 8 6.1 TEMPERATURE & HUMIDITY ................................................................................................................................................................................ 8 7. LIST OF TEST EQUIPMENT AND TEST FACILITY ................................................................................................................... 9 7.1 LIST OF TEST EQUIPMENT ................................................................................................................................................................................... 9 8. TEST RESULTS ............................................................................................................................................................................ 10 8.1 POWER AT THE FINAL AMPLIFIER ........................................................................................................................................................................ 11 8.2 RF OUTPUT POWER ........................................................................................................................................................................................... 12 8.2.1 RF Power Output Plot, 39 MHz ...................................................................................................................................................... 13 8.2.2 RF Power Output Plot, 45 MHz ...................................................................................................................................................... 14 8.2.3 RF Power Output Plot, 50 MHz ...................................................................................................................................................... 15 8.3 BANDWIDTH & EMISSION .................................................................................................................................................................................. 16 8.3.1 99% Bandwidth Plot, 12.5 kHz FM, 39 MHz ................................................................................................................................ 18 8.3.2 99% Bandwidth Plot, 20 kHz FM, 39 MHz .................................................................................................................................. 19 8.3.3 99% Bandwidth Plot, 25 kHz FM, 39 MHz ................................................................................................................................. 20 8.3.4 99% Bandwidth Plot, C4FM, F1E, 39 MHz ................................................................................................................................... 21 8.3.5 99% Bandwidth Plot, C4FM, F1D, 39 MHz .........................…

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13146 NW 86 th Drive, Suite 400, Alachua, Florida 32615 (352) 472-5500 / [email protected] Page 45 of 66 This test report shall not be reproduced except in full without the written and signed permission of IIA Lab Services LLC. a subsidiary of Industrial Inspection & Analysis, Inc. (“IIA”) 8.4.12 Emission Mask, 20 kHz FM, 50 MHz 13146 NW 86 th Drive, Suite 400, Alachua, Florida 32615 (352) 472-5500 / [email protected] Page 46 of 66 This test report shall not be reproduced except in full without the written and signed permission of IIA Lab Services LLC. a subsidiary of Industrial Inspection & Analysis, Inc. (“IIA”) 8.4.13 Emission Mask, 25 kHz FM, 50 MHz 13146 NW 86 th Drive, Suite 400, Alachua, Florida 32615 (352) 472-5500 / [email protected] Page 47 of 66 This test report shall not be reproduced except in full without the written and signed permission of IIA Lab Services LLC. a subsidiary of Industrial Inspection & Analysis, Inc. (“IIA”) 8.4.14 Emission Mask, C4FM, F1D 50 MHz Att 10 dB * Offset 50.4 dB A LVL Ref 47 dBm Center 50 MHzSpan100 kHz 10 kHz/ * * RBW 300 Hz VBW 1 kHz SWT 1.15 s 3DB * 1 AP VIEW -50 -40 -30 -20 -10 0 10 20 30 40 LIMIT CHECK PASS MASKC Date: 19.MAY.2026 11:13:08 13146 NW 86 th Drive, Suite 400, Alachua, Florida 32615 (352) 472-5500 / [email protected] Page 48 of 66 This test report shall not be reproduced except in …

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