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WSR-88D Transmitter Refurbishment










Transmitter Backplane Modernization



  • Transmitter Backplane and Control & Monitoring CCAs are based on 1980's technology and have become difficult and expensive to repair.
  • Project replaces "Wire-Wrapped"backplane design with modern multi-layered Printed Wiring Board (PWB) and combines the functions of 4 C&M CCAs onto a single multi-layered CCA
  • Fleet Implementation will be through use of a Mod Note beginning in FY16. Downtime should be minimal (<2hrs).




Transmitter Backplane Modernization





Pulse Modulator Upgrade

  • Eliminates "Top 3" failure items in Modulator:
    • RBDT Switch Assembly, Trigger Amplifier, Backswing Diode Stack
    • Trigger Amp will be retained in cabinet to maintain good airflow, but it will be inoperative
  • Requires addition of new:
    • High speed Fiber Optic Switch Assembly
    • Optical Discharge CCA - Converts electrical trigger signals to fiber optic signals required by new switch
    • RBDT Stack Monitor CCA - Monitors the voltage across the RBDT stack




Modulator Switch

Transmitter Refurbishment

Modulator Switch





Pulse Modulator Upgrade

  • Modulator Switch Prototype Testing
    • 1 prototype and 3 beta units delivered for test
    • Prototype operating on ROC test bed since July 2008
    • 3 Beta units operating reliably in field since January 2010
  • Scope of SLEP Effort
    • SLEP will fund the production and deployment of the new modulators
    • Deployment method is a round robin - sites receive upgraded modulator drawer and return the legacy for upgrade and reissue




Transmitter Chasis Refurbishment

  • Cable Replacement:
    • Cables become brittle over time, develop open circuits, broken pins on connectors, etc
    • In general, cables are either high voltage with lug terminals or signal cables
    • Documentation of wiring is incomplete
  • Component Replacement:
    • One-For-One Replacement: fuse holders, cable connectors, power filters, main breakers, centrifugal blowers
  • Refurbishment performed by commercial contractor(s) selected through competitive procurement process
  • Estimated Transmitter downtime is 5 days.