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Mileura Widefield Array – Low Frequency Demonstrator 80 - 300 MHz

Mileura Widefield Array – Low Frequency Demonstrator 80 - 300 MHz. Goal: HI at redshift 6 to 17. * Currently in “Early Deployment” phase. Tile 1. 500 Tiles. Layout in field instantaneous UV coverage. Ultimately…. 500 Tiles…. 1 km. Distance [km].

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Mileura Widefield Array – Low Frequency Demonstrator 80 - 300 MHz

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  1. Mileura Widefield Array – Low Frequency Demonstrator 80 - 300 MHz Goal: HI at redshift 6 to 17 * Currently in “Early Deployment” phase

  2. Tile 1

  3. 500 Tiles Layout in field instantaneous UV coverage Ultimately…. 500 Tiles… 1 km Distance [km]

  4. Beamformer

  5. Current Signal Path (Early Deployment) 16 dual-pol dipoles “Tile” Beamformer … for each tile… IF Converter 80-350 MHz 200m coax A/D 16Msampl/sec Linux box+VSIB +TByte RAID +software processing LVDS 26-30 MHz Tile 2 Tile 3

  6. Current Signal Path (Early Deployment) 16 dual-pol dipoles “Tile” Beamformer … for each tile… IF Converter 80-350 MHz 200m coax A/D 16Msampl/sec Linux box+VSIB +TByte RAID +software processing LVDS 26-30 MHz Tile 2 Tile 3

  7. Current Signal Path (Early Deployment) 16 dual-pol dipoles “Tile” Beamformer … for each tile… IF Converter 80-350 MHz 200m coax A/D 16Msampl/sec Linux box+VSIB +TByte RAID +software processing LVDS 26-30 MHz Tile 2 Tile 3

  8. Eric’s IF Converter 0-300MHz in 10 MHz 4 MHz 26-30MHz out

  9. Current Signal Path (Early Deployment) 16 dual-pol dipoles “Tile” Beamformer … for each tile… IF Converter 80-350 MHz 200m coax A/D 16Msampl/sec Linux box+VSIB +TByte RAID +software processing LVDS 26-30 MHz Tile 2 Tile 3

  10. 8bit digital out • Portable • Toolkit for • Radio Expts • software • suite Analog 26-30 MHzin

  11. Current Signal Path (Early Deployment) 16 dual-pol dipoles “Tile” Beamformer … for each tile… IF Converter 80-350 MHz 200m coax A/D 16Msampl/sec Linux box+VSIB +TByte RAID +software processing LVDS 26-30 MHz Tile 2 Tile 3

  12. Verification of electronic Beam Steering

  13. Observation of Sun: natural fringes @ 100 MHz

  14. Phases are well behaved for all declinations

  15. Fornax A

  16. Sample deep Spectra - 1kHz resolution 1/2 hr 1 hr Power relative to Sky [dB] 1 hr 1/2 hr

  17. ED1 - Complete Spectral Scan - 250,000 channels

  18. Current Signal Path (Early Deployment) 16 dual-pol dipoles “Tile” Beamformer … for each tile… IF Converter 80-350 MHz 200m coax A/D 16Msampl/sec Linux box+VSIB +TByte RAID +software processing LVDS 26-30 MHz Tile 2 Tile 3

  19. Beamformer Beamformer Beamformer Beamformer Next Generation Signal Path Group 16 tiles into “NODE” 80-350 MHz Node Electronics 16 x 2 pol inputs Correlator < 1 km fibre

  20. Beamformer 6bit A/D PP Filter select 32 MHz 8 KHz Channels Next Generation Signal Path Node serves 16 tiles: 80-350 MHz Node Electronics 16 x 2 pol inputs ………… Correlator < 1 km fibre

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