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

2. Tile 1

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

6. Beamformer

7. 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

8. 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

9. 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

10. Eric’s IF Converter 0-300MHz in 26-30MHz out 10 MHz4 MHz

11. 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

12. Analog 26-30 MHz in 8bit digital out Portable Toolkit for Radio Expts software suite

13. 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

15. Verification of electronic Beam Steering

16. Observation of Sun: natural fringes @ 100 MHz

17. Phases are well behaved for all declinations

18. Fornax A

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

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

22. 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

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

24. 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 …………