1. October 29, 2002 International Loran Association Design and Test of the First 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. 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. 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. 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. 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 32 HCG Cape RaceAccufix 7500 Wildwood Antenna Current715 AMPS680 AMPS P2P ECD VAR <.45  sec<.15  sec P2P Timing Error< 25 nsec< 10 nsec Phase Mod 2 nd 3 rd 4-12 ~150 nsec ~100 nsec ~50 nsec ~75 nsec ~50 nsec ~35 nsec Input65 kW59 kW

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