*** Amended Solicitation*** SOLE SOURCE, Firmware Upgrades to the FEI-Zyfer, Inc. TFRMS

This is a sole source solicitation for firmware upgrades to proprietary FEI-Zyfer, Inc. Time and Frequency Reference Measurement Systems (TFRMS) installed at the United States Naval Observatory, issued under FAR Subpart 12.6 as a combined presolicitation notice with no written solicitation distributed; all information is available exclusively on SAM.gov using solicitation number N0018926QL174. The requirement is for firmware modifications to enable support of TRACER and similar modems as external timing references, increasing system performance and achieving GPS independence by accommodating up to 16 data input streams, ensuring seamless transition between GTF modules, and retaining the existing Kalman filter architecture for the TFRMS Clock Ensemble. The deliverable consists of firmware updates for 50 TFRMS systems along with final technical reports for USNO acceptance, with delivery due no later than September 30, 2026, under FOB destination terms at Washington, D.C., zip code 20392. All proposals must conform to the technical specifications, and award will be made on a firm-fixed-price basis solely to FEI-Zyfer, Inc., based entirely on price reasonableness as evaluated under DFARS 212.209(a), with no other evaluation factors considered. The contract incorporates clauses and deviations effective through FAC 2026-01 and DFARS Publication Notice Change 20260507, including mandatory compliance with SAM registration, current representations and certifications in SAM within the last 12 months, and adherence to provisions such as prohibitions on contracting with inverted domestic corporations and foreign-made unmanned aircraft systems, cybersecurity requirements under 252.204-7012 and 252.240-7997, and safeguards against trafficking in persons. Technical conformity and SAM registration are pass/fail gates; failure on either disqualifies a proposal. Items must be uniquely identified per MIL-STD-130 with machine-readable tags verified using automatic identification technology compliant with Appendix A, and shipments must be labeled per MIL-STD-129. Payment and receiving reports must be submitted electronically through WAWF, with all documentation meeting DFARS Appendix F standards, and contractors must report unique item identifiers, enterprise codes, original part numbers, acquisition costs, and warranty status as part of the Material Inspection and Receiving Report. The solicitation allows for competitive responses but is structured