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Mileura Widefield Array – Low Frequency Demonstrator 80 - 300 MHz

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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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Presentation Transcript
slide1
Mileura Widefield Array –

Low Frequency Demonstrator

80 - 300 MHz

Goal: HI at redshift 6 to 17

* Currently in “Early Deployment” phase

slide3
500 Tiles

Layout in field instantaneous UV coverage

Ultimately…. 500 Tiles…

1 km

Distance [km]

slide7
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

slide8
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

slide9
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

slide10
Eric’s IF Converter

0-300MHz in

10 MHz

4 MHz

26-30MHz out

slide11
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

slide12
8bit digital out
  • Portable
  • Toolkit for
  • Radio Expts
  • software
  • suite

Analog 26-30 MHzin

slide13
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

slide17
Phases are

well behaved

for all

declinations

slide20
Sample deep Spectra - 1kHz resolution

1/2 hr

1 hr

Power relative to Sky [dB]

1 hr

1/2 hr

slide22
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

slide23
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

slide24
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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