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The Next Generation of Sub-Millimeter Receiver Control

Explore the next generation of sub-millimeter receiver control presented at the Steward Observatory Symposium in 2008 by Thomas Folkers and David Forbes. This session highlights the benefits of remote receiver control, including enhanced tuning, diagnosis, and operational consistency. The presentation reviews the design evolution from early systems using VxWorks and DOS to more modern Linux-based interfaces. Discover the fully integrated architecture of the new receiver control systems designed for improved performance at various frequencies, demonstrating the significance of innovation in radio astronomy.

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The Next Generation of Sub-Millimeter Receiver Control

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  1. The Next Generation of Sub-Millimeter Receiver Control Thomas Folkers David Forbes Arizona Radio Observatory Steward Observatory Symposium Feb 26-27, 2008

  2. Why Remote Receiver Control? • Allows: • Remote Tuning • Remote Diagnosis & Debugging • Consistency in Training and Operation • Faster Frequency Changes and Setup

  3. Receiver Control Design History • Designed in 1989 by NRAO for the 12 Meter • VxWorks VME Computer ($10,000) • DOS Based Interface • One User Interface Session Supported • Card Cage Interface to Hardware • Updated to SunOS/X11 Interface in 1992 • Design Revision in 2004 for JT System • Embedded Computer ($1,000) • PC104 I/O Cards (2 x $400) • Linux RH90 • Unlimited Number on User Interfaces Supported • Used Same Card Cage I/O Design • GTK User Interface

  4. NRAO DesignedReceiver Control

  5. NRAO Design Receiver Control VxWorks VME Computer

  6. NRAO Design Receiver ControlCard Cage

  7. NRAO Design Receiver ControlCard Cage Computer Connections

  8. NRAO Design Receiver ControlCard Cage Hardware Connections

  9. “JT” Design Receiver Control

  10. “JT” Control Design • Based on the NRAO Design • Separate Computer and Card Cage • Used Complete Linux Embedded System • PC104 I/O Cards • Active File System • Powering Off Caused Problems • 11 Processes Running in System • Required UPS Backup System • X11 User Interface can run on any Local host

  11. “JT” Receiver DesignEmbedded Linux Computer

  12. “JT” Receiver DesignConnections

  13. “JT” 230 GHz Installation

  14. Latest Receiver Control Design

  15. New Integrated Design • Custom Embedded Controller Cards • No Active File-System • Only 2 Processes on Host Computer • Serial Comm Task • Interface Daemon • Share a Common Global Memory • Standardized Design • Used in the 345 & Future 650 and 950 GHz Systems. • Plans to retrofit 230 GHz “JT” system

  16. Fully Integrated Card Cage System(345 GHz System Front View)

  17. Fully Integrated Card Cage System(Block Diagram)

  18. Fully Integrated Card Cage System(Analog - Digital I/O Card)

  19. Fully Integrated Card Cage System(Serial Card)

  20. Fully Integrated Card Cage System(Rear View)

  21. User Tuning Interface GUI

  22. For Further Information: • ARO Web Site: • http://aro.as.arizona.edu/

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