ZD8C5K-PACommercial Grade 5 kW High Frequency (HF) Linear Power Amplifier

Amendment No. 1 MUTUAL NONDISCLOSURE AGREEMENT This Amendment No. 1 (“Amendment”) amends the Mutual Nondisclosure Agreement No. 19N0064 between FlexRadio (“Contractor”) and ARINC Incorporated, a part of Collins Aerospace (“ARINC”) dated March 26, 2019 (“Agreement”), and is entered into and effective ___________________________ (“Effective Date”). WHEREAS, the Parties wish to amend or extend the Agreement as set forth herein. THEREFORE, for valuable consideration, the adequacy and receipt of which are hereby acknowledged, the Parties agree to amend the Agreement as follows: Rockwell Collins, Inc. 400 Collins Road NE, Cedar Rapids, IA 52498 U.S.A., as an affiliate of ARINC Incorporated and a part of Collins Aerospace; and Rockwell Collins Canada, Inc., 30 Edgewater Street, Suite 104, Ottawa, Ontario, K2L 1V8, Canada, a part of Collins Aerospace are hereby included as a parties to this Agreement. And The Purpose is modified to read “discuss specifications, including but not limited to all technical data and specifications relating to the R/T-2200A transceiver, required to support the integration between the Collins RT- 2200A transceiver and a FlexRadio Power Amplifiier” And Add the following to the end of Section 2.: “Given that an R/T-2200A interface specification and an integration unit will be provided to Flex Radio in order to complete contracted work, Company agrees not to copy or reverse engineer, or to cause or enable others to copy or reverse engineer, any Confidential Information contained in such R/T-2200A interface specification or integration unit.” All other terms and conditions remain unchanged. IN WITNESS WHEREOF, the parties have executed this Amendment. All signed copies of this Amendment shall be deemed originals. ARINC Incorporated a Collins Aerospace company FlexRadio By: By: Name: Name: Title: Title: Date: Date: Rockwell Collins, Inc. a Collins Aerospace company Rockwell Collins Canada, Inc. a Collins Aerospace company By: By: Name: Name: Title: Title: Date: Date:

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Proposed Label: 5000-Wat HF Radio Amplifier 5021-0011-000-6812 FCC ID: ZD8C5K-PA Model: C5K-PA Ra�ngs: 208V AC, 3PH, 60Hz, 50A SCCR: 31KA Assembled from Foreign and Domes�c Components in Aus�n , Texas 78728 Loca�on: Label is located on the Right-side panel in the upper rear corner.

47 CFR 1.1310(e)(1) Maximum Permissible Exposure (MPE) - Limits for General Population/Uncontrolled Exposure Frequency (f) Average Power (P) Antenna Gain (G) Duty Cycle (DC) EIRP 1 EIRP R Power Density 2 (PD) Power Density Limit Margin MHz dBm dBi%dBm mWcm mW/cm 2 mW/cm 2 dB 2.7564.00.0100.064.025000009200.23523.820.1 1664.00.0100.064.025000009200.2350.74.8 2364.00.0100.064.025000009200.2350.31.6 1 EIRP dBm = P + G+10Log(D/100) 2 PD = EIRP mW /(4πR 2 )

Project #: 22343-15 Company: FlexRadio Systems EUT Name: Skyline 5000-watt RF Power Amplifier EUT Model: C5K-PA FCC CFR 47 Part 2 and Part 87 Wireless Test Report Prepared for: FlexRadio Systems 4616 W. Howard Lane, Suite 8-860 Austin, TX 78728 By Nemko USA, Inc. 1601 North A.W. Grimes Blvd., Suite B Round Rock, Texas 78665 May 3, 2023 Written by Shakil Murad Wireless Engineer 22343-15, C5K-PA Nemko USA, Inc. Page 2 of 37 Revision History Revision Number Description Date Draft01 Initial release for review 10/24/2022 Draft02 Made update from customer review 11/08/2022 Final Final Report 11/8/2022 Final01 Added modulation data for mask/power/spurious 5/3/2023 22343-15, C5K-PA Nemko USA, Inc. Page 3 of 37 Table of C ontents 1.0 Introduction .......................................................................................................................................................... 5 1.1 Scope ............................................................................................................................................................... 5 1.2 EUT Description ............................................................................................................................................. 5 1.3 Support Equipment ......................................................................................................................................... 5 1.4 EUT Test Configuration .................................................................................................................................. 5 1.5 Modifications to Equipment ............................................................................................................................ 5 1.6 Test Site .......................................................................................................................................................... 5 1.7 Measurement Corrections ............................................................................................................................... 6 1.8 Applicable Documents .................................................................................................................................... 6 2.0 RF Output Power - 87.139 (c)(1)/(2)/(3).............................................................................................................. 7 2.1 Test Procedure ................................................................................................................................................ 7 2.2 Test Criteria .................................................................................................................................................... 7 2.3 Test Results ..................................................................................................................................................... 7 3.0 Conducted Spurious Emissions - 2.1051 and 87.139 (c)(3) ............................................................................... 10 3.1 Test Procedure .............................................................................................................................................. 10 3.2 Test Criteria .................................................................................................................................................. 10 3.3 Test Results ................................................................................................................................................... 10 3.3.1 Test data .............................................................................................................................................. 10 4.0 Emission Limitations - 2.1051 and 87.139 (c)(3) .............................................................................................. 12 4.1 Test Procedure .............................................................................................................................................. 12 4.2 Test Criteria .................................................................................................................................................. 12 4.3 Test Results ................................................................................................................................................... 12 4.3.1 Test data .............................................................................................................................................. 12 5.0 Field Strength of Radiated Spurious Emissions - 2.1053 and 87.139 (c)(3) ...................................................... 16 5.1 Test Procedure .............................................................................................................................................. 16 5.2 Test Criteria .................................................................................................................................................. 16 5.3 Test Results ................................................................................................................................................... 16 5.3.1 Test data .............................................................................................................................................. 17 6.0 Measurement Bandwidths .................................................................................................................................. 34 7.0 Test Equipment .................................................................................................................................................. 35 7.1 Conducted Measurements at the Antenna Port ............................................................................................. 35 7.2 Radiated Emissions ....................................................................................................................................... 36 Appendix: Policy, Rationale, and Evaluation of EMC Measurement Uncertainty...…

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