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Published byAndrew Tobias Eaton Modified over 9 years ago
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Mileura Widefield Array – Low Frequency Demonstrator 80 - 300 MHz * Currently in “Early Deployment” phase Goal: HI at redshift 6 to 17
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Tile 1
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Ultimately…. 500 Tiles… 500 Tiles Layout in field instantaneous UV coverage Distance [km] 1 km
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Beamformer
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16 dual-pol dipoles 80-350 MHz 200m coax IF Converter A/D 16Msampl/sec 26-30 MHz Linux box+VSIB +TByte RAID +software processing LVDS Current Signal Path (Early Deployment) “Tile” … for each tile… Tile 2 Tile 3
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Beamformer 16 dual-pol dipoles 80-350 MHz 200m coax IF Converter A/D 16Msampl/sec 26-30 MHz Linux box+VSIB +TByte RAID +software processing LVDS Current Signal Path (Early Deployment) “Tile” … for each tile… Tile 2 Tile 3
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Beamformer 16 dual-pol dipoles 80-350 MHz 200m coax IF Converter A/D 16Msampl/sec 26-30 MHz Linux box+VSIB +TByte RAID +software processing LVDS Current Signal Path (Early Deployment) “Tile” … for each tile… Tile 2 Tile 3
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Eric’s IF Converter 0-300MHz in 26-30MHz out 10 MHz4 MHz
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Beamformer 16 dual-pol dipoles 80-350 MHz 200m coax IF Converter A/D 16Msampl/sec 26-30 MHz Linux box+VSIB +TByte RAID +software processing LVDS Current Signal Path (Early Deployment) “Tile” … for each tile… Tile 2 Tile 3
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Analog 26-30 MHz in 8bit digital out Portable Toolkit for Radio Expts software suite
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Beamformer 16 dual-pol dipoles 80-350 MHz 200m coax IF Converter A/D 16Msampl/sec 26-30 MHz Linux box+VSIB +TByte RAID +software processing LVDS Current Signal Path (Early Deployment) “Tile” … for each tile… Tile 2 Tile 3
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Verification of electronic Beam Steering
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Observation of Sun: natural fringes @ 100 MHz
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Phases are well behaved for all declinations
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Fornax A
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Power relative to Sky [dB] Sample deep Spectra - 1kHz resolution 1/2 hr 1 hr
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ED1 - Complete Spectral Scan - 250,000 channels
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Beamformer 16 dual-pol dipoles 80-350 MHz 200m coax IF Converter A/D 16Msampl/sec 26-30 MHz Linux box+VSIB +TByte RAID +software processing LVDS Current Signal Path (Early Deployment) “Tile” … for each tile… Tile 2 Tile 3
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Group 16 tiles into “NODE” Next Generation Signal Path Beamformer Node Electronics 16 x 2 pol inputs 80-350 MHz Correlator < 1 km fibre
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Node serves 16 tiles: Next Generation Signal Path Beamformer Node Electronics 16 x 2 pol inputs 80-350 MHz Correlator < 1 km fibre 6bit A/D PP Filter select 32 MHz 8 KHz Channels …………
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