Expeditionary Very Low Frequency (ExVLF) Transmitter Systemview on SAM.gov

Area of Interest (AOI): Expeditionary Very Low Frequency (ExVLF) Transmitter SystemAmendment 0001PAO Release Number: NAVWAR HQCA-2026-A-071Notice ID: N0003926RB004Notice to Industry: This is an AOI issued under Naval Information Warfare Systems Command (NAVWAR) Commercial Solutions Opening (CSO) number N0003925S0001. This AOI solicits white papers/solution briefs (Phase 1 of the CSO) from industry. To the extent that any implementing regulations have not been updated to reflect statutory changes, the terms of the statute shall govern. Responses Due: 18-AUG-2026 at 2:00 PM PDT*Questions Due: 28-JUL-2026 at 2:00 PM PDT.*Answers to questions included below.The Government may not address all questions received. Questions and Answers will be posted on the NAVWAR CSO Website: https://www.navwar.navy.mil/Work-With-Us/Open-CSO-Calls/Contact information for questions and technical/submission issues: ian.m.robinson14.civ@us.navy.milBackground:The Expeditionary Very Low Frequency (ExVLF) communications system is a modular, relocatable communications suite supported by an aerostat-lofted tethered antenna that enables 24/7 VLF radio wave data broadcasts over distance to maritime mobile and shore-based receive nodes.Problem StatementThe US Navy seeks solutions for an Expeditionary Very Low Frequency (ExVLF) transmitter system. The Navy requires a high-reliability solution that supports 24-hour per day, 7-day per week (24/7) data broadcast operations. As a result of this AOI, it is anticipated that initial efforts will focus on a prototype delivery phase, with potential options for follow-on production units to satisfy long-term operational inventory objectives. The system must be designed for deployment in rugged, multi-environment locations and integrate with Government-Furnished Equipment (GFE).Primary Solution Attributes:? High-Power Performance and Tuning: A containerized VLF transmitter system, consisting of a power amplification subsystem and a dynamic and automatic tuning element subsystem, designed to generate and radiate RF power by integrating with and automatically tuning to the specific complex impedance characteristics of a government-furnished Wireless Communications Aerostat (WCA) tethered antenna.? Integrated Transmitter System: The entire transmitter system must be housed within a no greater than 20-foot ISO general-purpose freight container to ensure it is transportable, deployable, and relocatable in diverse environments. The assembly must be hardened for deployment in rugged environments and include all necessary subsystems for operation.? Modulator and Signal Generation: An integrated subsystem to generate the required VLF waveforms. All signal characteristics, including modulation formats, reference frequency accuracy, and timing, must be sufficient to meet the top-level requirements of the ExVLF data broadcast mission.? Control and Monitoring System: A unified control system for local and remote operation of the transmitter. It should pr…