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Pharos 2 – Upgraded C-Band PAF

Explore the upgraded Pharos 2 C-Band PAF for improved performance in radio astronomy research. Learn about the innovative design elements and significant enhancements over the original Pharos system.

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Pharos 2 – Upgraded C-Band PAF

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  1. Pharos 2 – Upgraded C-Band PAF Simon Melhuish, Mike D’Cruze, Keith Grainge, Michael Keith and Mark McCulloch, Jodrell Bank Centre for Astrophysics, Manchester, UK

  2. Origins • FP5 RTD programme FARADAY • Jodrell Bank Observatory (JBO) • University of Birmingham • Istitutodi Radioastronomia (INAF), • Microwave Engineering Centre for Space Applications (MECSA) • Netherlands Foundation for Research in Astronomy (ASTRON) • + others

  3. Pharos block diagram – original design

  4. Pharos – original design • Radome • Perspex • IR Filter • Polystyrene • LNAs • In-house • Beam-former • Analogue

  5. “Pharos2” – Why Upgrade? • Radome noise can be reduced • IR load can be reduced with RT-MLI • LNA state-of-the-art has improved • Old analogue beam-former never fully populated • Performance not so good either

  6. Pharos2 – New Configuration • New radome (NRC) • New IR filter (see e.g. Choi et al.) • New LNF LNAs + Chalmers / LNF bias supply • Italian warm electronics & beam-former (iTPM)

  7. New – IR Filter • Polystyrene foam – “Depron” • Demonstrated improvement over original IR filter • More disks → greater improvement • More disks added since test

  8. New LNAs (LNF-LNC4_8C_2)

  9. New Bias Supply – PSX

  10. Dewar contents old / new

  11. Test Results- Naked elements

  12. Test Results- Analogue beam-former

  13. Test Results - Comparison with old LNAs

  14. Next stepsNew back-end by INAF

  15. Where to Put It? • Original plan • Lovell Telescope, 76 m • Suggested • Noto, 32 m • Final • 25-m Merlin telescope at Pickmere

  16. New Location

  17. Installation into Focus Box

  18. Next stepsObservations • During EVN session 3 • October / November 2019 • Crane is booked!

  19. What then (in 2020)? • Replace the radome • Re-measure Tsys • Replace Vivaldi array • S-band prototype (later talk) • S-band LNF LNAs • INAF back-end covers S-band

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