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PTC Setup at VLA B. Carlson

Detailed outline of meeting topics including Overview, Connectivity, Timecode Distribution, and Schedule for EVLA Correlator. Summary of station and baseline boards, connectivity setup, and project schedule.

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PTC Setup at VLA B. Carlson

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  1. PTC Setup at VLAB. Carlson EVLA Correlator F2F Meeting Dec. 11-12, 2007

  2. Outline • Overview. • Connectivity. • Timecode distribution. • Schedule. EVLA Correlator F2F Meeting - PTC at VLA

  3. Overview • 10 Station Boards. • 12 Baseline Boards. • 12x128 = 1.536 GHz in both polarizations (3-bit) • 8-bit: only 1 polarization unless do some “fiber fiddling” with ½ antennas. • Use production racks at site, with production cables. • It is a partially populated correlator. EVLA Correlator F2F Meeting - PTC at VLA

  4. Connectivity • 10 Station Boards installed in 3 racks. • 1 quadrant. • 4 boards in 2 racks, 2 boards in last rack. • If X-bar Boards not ready…bypass using direct connection of long cables “split-off” into Station Board outputs. EVLA Correlator F2F Meeting - PTC at VLA

  5. EVLA Correlator F2F Meeting - PTC at VLA

  6. Connectivity • Baseline Boards: • 12 boards available. • Partially populate 1 quadrant (2 racks) with every other board. • Only doing 10 stations (10 active wafers into each Baseline Board), so only need 1 Baseline Board to do all baselines for 1 sub-band pair. EVLA Correlator F2F Meeting - PTC at VLA

  7. EVLA Correlator F2F Meeting - PTC at VLA

  8. Timecode Distribution • If X-bar Board not ready, use existing FB/TC board to provide NRAO TC to Station Boards. • Have to jury-rig temporary Meritec cabling to accomplish this. • Not a problem…it’s all Meritec wafers anyway. EVLA Correlator F2F Meeting - PTC at VLA

  9. Schedule • Should have rack-to-rack cables ready for install mid-end February/08. • Provided no delays in Meritec delivery. • Cable set sheathing, heat-shrink, now in stock. • Cable set plan ready. • Labels ready shortly. • People all geared up to start as soon as cables arrive. • Should have racks ready by end of April/08 or sooner. EVLA Correlator F2F Meeting - PTC at VLA

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