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Design and Test of the First Article Accufix 7500 Transmitter

Detailed overview of the Accufix 7500 Transmitter project covering factors leading to the need for a new transmitter, goals, improved architecture, assembly details, benefits, and ongoing work. It also discusses signal performance measurements, testing tasks, and project summary.

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Design and Test of the First Article Accufix 7500 Transmitter

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  1. Design and Test of theFirst Article Accufix 7500 Transmitter Presented by Mark Danieli

  2. Need for New Transmitter • Factors leading to decision for new transmitter • Goals for new transmitter

  3. Factors Leading To Decision For New Transmitter • TTX not supportable in near term • TTX/SSX do not support additional capabilities (i.e. IFM) • Cost reduction associated with fewer personnel requirements • Unmanned Stations • Remote Control

  4. Goals for New Transmitter • Increase individual HCG output power through component improvements • Modernize Control Console - TCS • Make the number of DHCs variable and assignments flexible • Future incorporation of IFM has minimal impact on system architecture • Maximize commonality with existing USCG assemblies

  5. Accufix 7500 Transmitter Overview

  6. Improved Architecture • Prime Power Distribution Unit • Pulse Generator Assembly • Switch Network Assembly • Coupling Cabinet Assembly • Transmitter Control Subsystem (TCS)

  7. Prime Power Distribution Unit

  8. Prime Power Distribution Unit • Provides emergency shutdown, at the site and via remote control • Configuration dependent on the number of HCGs in transmitter • Each subsystem has a dedicated breaker

  9. Pulse Generator Assembly

  10. Pulse Generator Assembly • PGA consists of 4 HCGs • Component modernization: • Fire detection module linked to TCS • HCG Assembly • Power Supply Reengineering • Card Cage / Circuit Boards • Backplane PCB • Module connections • Increased Capacitance (Droop)

  11. HCG Power Supply 6500 Series 7500 Series Control Logic Boards

  12. Pulse Generator Assembly (Con’t) • Megatron Charger Assembly • A4 Resistor Board • Connector Replacement • Megatron Assembly • Oil filling Connector • Snubber Board Addition • Higher Power Diode • Connector Replacement

  13. Switch Network Assembly

  14. Switch Network Assembly • 3 second switchover • Switch modules interchangeable • New lightning arrestor • Redundant DHC and Antenna current feedbacks • Service Life Extension Program (SLEP)

  15. Coupling Cabinet Assembly

  16. Coupling Cabinet Assembly • Total Redesign – symmetric • Reduced footprint • Modular • Electrically a hybrid between the 6500 and the AN/FPN-64 • Circuit breakers now used in place of fuses

  17. Benefits • Increased Output Power/higher efficiency • Increased flexibility • More robust ECD control • Improved Timing Stability

  18. Work In Progress • Ongoing development • Future software enhancements • Refined fail soft • Signal Quality Analyzer (SQA)

  19. Factory System Acceptance Testing • Performance Measurements • Test and Demonstration Tasks

  20. Transmitted Signal Performance Measurements • Envelope Shape Measurements • Amplitude measurements for positive and negative phase-coded pulses • RF Zero Crossing Measurements • Specifications relates more the timing accuracy of the output pulses rather than to phase accuracy • Spectrum & Harmonics Measurements • Power Input Measurements • IAW COMDTINST M16562

  21. Performance Measurements

  22. Test and Demonstration Tasks • Single Rate Test • Dual Rate Test • HCG Failure Recovery Test • Switch-over Test • 120-Hour Burn-In Test

  23. Summary • 16 HCG Transmitter for USCG LSU • FSAT completed in October 02 • Installation completed in November 02 • 48 HCG Transmitter for LORSTA George, WA • FSAT in December 02 • Installation in January 03 • 16 HCG Transmitter for LORSTA Kodiak, AK • In process • USCG Support

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