1. VLBI component of the NCRIS Australian Government Geoscience Australia 15 August 2006, Canberra

2. Geoscience Australia 15 August 2006 Very accurate coordinates of quasars are required! Collaboration between astronomers and geodesists!

3. Radiotelescopes in Australia Geoscience Australia 15 August 2006

4. New network benefit Geoscience Australia 15 August 2006

5. New radiotelescope design Geoscience Australia - 12 meter dish (“Patriot”); - High slew rate (~ 5 deg/sec); - 5 deg elevation angle limit - S/X band receiver; - Near real-time VLBI (long-term future); - Broad band receiver (long-term future); 15 August 2006

6. 12m Antenna at Patriot

7. Geoscience Australia - is currently tested in Jet Propulsion Laboratory (JPL); - positive feedback after photogrammetry of the primary reflector focus; - good efficiency in X- and Ka-bands; - fringe was found on 500-m baseline; - more tests are being conducted 15 August 2006 12m Antenna at Patriot

8. Geoscience Australia A pair of 12 m antennas operating at 2 Gbps will have exactly the same sensitivity as a pair of 20m antennas operating at a data rate of 256 Mbps. 15 August 2006 New Mark5B+ recorder is focused to reach the 2 Gbps data rate

9. Mark 5 Upgrade Costs Target Existing Mk5AMk5BMk5B+ 0$16.3K~$18-20K~$20-22K Mk5A-~$2-2.5K (Mk5B I/O) ~$11.5-12K (Mk5B I/O plus Amazon) Mk5B--~$9555 (Amazon) Note: Does not include external cabling costs, typically a few hundred dollars

10. Simulations Geoscience Australia - Realistic schedule (simulated data made in NASA); - six Northern hemisphere sites; - Hartrao (South Africa); - Selection of Australian and New Zealand sites; - Hobart: two options (“old” - existing; “new” - proposed) 15 August 2006

11. Geodetic results (Hobart) Geoscience Australia 15 August 2006 1 - “old” Hobart 3 – “old” Hobart + new site 5 – three new sites 2 - “new” Hobart 4 – “new” Hobart + new site 6 – four new sites (+NZ)

12. Geodetic results (Yarragadee) Geoscience Australia 15 August 2006 1 – Yarra single 3 – three new Australian sites 2 – Yarra + “new” Hobart 4 – four new sites (+NZ)

13. How many new dishes? Geoscience Australia Three new dishes would provide - 10% more accuracy in height component; - 20% more accuracy in horizontal components; - more flexible schedules; - parallel observations by two dishes in Hobart would help to study the old Hobart telescope’s mechanical and thermal deformations, allowing revision of the historical data records. 15 August 2006

14. How many new dishes? Geoscience Australia - International VLBI Service (IVS) strongly supports the third new dish 15 August 2006 3 2 or