Design and Test of the First Article Accufix 7500 Transmitter

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Design and Test of theFirst Article Accufix 7500
Transmitter

• Presented by Mark Danieli

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Need for New Transmitter

• Factors leading to decision for new transmitter
• Goals for new transmitter

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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

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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

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Accufix 7500 Transmitter Overview
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Improved Architecture

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

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Prime Power Distribution Unit
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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

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Pulse Generator Assembly
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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)

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HCG Power Supply

• 6500 Series 7500 Series Control Logic
  Boards

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Pulse Generator Assembly (Cont)

• Megatron Charger Assembly
• A4 Resistor Board
• Connector Replacement
• Megatron Assembly
• Oil filling Connector
• Snubber Board Addition
• Higher Power Diode
• Connector Replacement

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Switch Network Assembly
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Switch Network Assembly

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

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Coupling Cabinet Assembly
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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

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Benefits

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

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Work In Progress

• Ongoing development
• Future software enhancements
• Refined fail soft
• Signal Quality Analyzer (SQA)

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Factory System Acceptance Testing

• Performance Measurements
• Test and Demonstration Tasks

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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

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Performance Measurements
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Test and Demonstration Tasks

• Single Rate Test
• Dual Rate Test
• HCG Failure Recovery Test
• Switch-over Test
• 120-Hour Burn-In Test

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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