mileura widefield array – low frequency demonstrator 80 - 300 mhz * currently in “early...
TRANSCRIPT
Mileura Widefield Array – Low Frequency Demonstrator 80 - 300 MHz
* Currently in “Early Deployment” phase
Goal: HI at redshift 6 to 17
Tile 1
Ultimately…. 500 Tiles…
500 Tiles
Layout in field instantaneous UV coverage
Distance [km]
1 km
Beamformer
Beamformer
16 dual-pol dipoles
80-350 MHz200m coax IF Converter
A/D16Msampl/sec 26-30 MHz
Linux box+VSIB+TByte RAID
+software processing
LVDS
Current Signal Path (Early Deployment)
“Tile”
… for each tile…
Tile 2Tile 3
Beamformer
16 dual-pol dipoles
80-350 MHz200m coax IF Converter
A/D16Msampl/sec 26-30 MHz
Linux box+VSIB+TByte RAID
+software processing
LVDS
Current Signal Path (Early Deployment)
“Tile”
… for each tile…
Tile 2Tile 3
Beamformer
16 dual-pol dipoles
80-350 MHz200m coax IF Converter
A/D16Msampl/sec 26-30 MHz
Linux box+VSIB+TByte RAID
+software processing
LVDS
Current Signal Path (Early Deployment)
“Tile”
… for each tile…
Tile 2Tile 3
Eric’s IF Converter
0-300MHz in
26-30MHz out10 MHz 4 MHz
Beamformer
16 dual-pol dipoles
80-350 MHz200m coax IF Converter
A/D16Msampl/sec26-30 MHz
Linux box+VSIB+TByte RAID
+software processing
LVDS
Current Signal Path (Early Deployment)
“Tile”
… for each tile…
Tile 2Tile 3
Analog 26-30 MHz in
8bit digital out
• PortableToolkit forRadio Expts
• software suite
Beamformer
16 dual-pol dipoles
80-350 MHz200m coax IF Converter
A/D16Msampl/sec 26-30 MHz
Linux box+VSIB+TByte RAID
+software processing
LVDS
Current Signal Path (Early Deployment)
“Tile”
… for each tile…
Tile 2Tile 3
Verification of electronic Beam Steering
Observation of Sun: natural fringes @ 100 MHz
Phases are well behaved for all declinations
Fornax A
Pow
er r
elat
ive
to S
ky [d
B]
Sample deep Spectra - 1kHz resolution
1/2 hr
1/2 hr
1 hr
1 hr
ED1 - Complete Spectral Scan - 250,000 channels
Beamformer
16 dual-pol dipoles
80-350 MHz200m coax IF Converter
A/D16Msampl/sec 26-30 MHz
Linux box+VSIB+TByte RAID
+software processing
LVDS
Current Signal Path (Early Deployment)
“Tile”
… for each tile…
Tile 2Tile 3
Group 16 tiles into “NODE”Next Generation Signal Path
Beamformer
Beamformer
Beamformer
Beamformer Node Electronics16 x 2 pol inputs
80-350 MHz
Correlator< 1 km fibre
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 Filterselect
32 MHz8 KHz
Channels
…………