VEGAS Pulsar Project Meeting: 2015 June 15th 2:00 - 3:00pm ET

Room / Connection Details

  • GB-137 / Soc 280
  • 192.33.117.12##7144
  • 434-817-6443

Housekeeping Details

  • Main wiki page
  • gbsapp Mailing List
  • Location and regular date and time of meeting - agreed weekly on Mondays; GB-137 / Soc-280; 2-3pm ET
  • ETK codes:
    • Electronics: 432510.GB3015
    • Software: 893252.GB3015
    • Science: 432540.GB3015

Resource Allocations

GUPITA, ARINDAM 1.00
FORD, JOHN 0.10
MCCULLOUGH, RANDY 0.40
RAY, JASON 0.55
BLOSS, MARTY 0.05
CREAGER, RAY 0.8
RICHMOND DECKER, JUSTIN 0.0
LYNCH, RYAN 0.25
DEMOREST, PAUL 0.25
PRESTAGE, RICHARD 0.1

Present

  • Marty, Justin, Randy, Richard, Arindam, Ray, Hong Chen, Ryan, Paul, Jason, Ray, John

Agenda

General Updates

  • BOF Files
    • Working on timing issues in 1500 MHz modes
      • Arindam is seeing as much as a 2 ns slack, possibly due to a comibation of routing and logic
      • Able to reduce to 0.6 ns, but need to reduce further
      • Arindam will sit down with CASPER team to try and reduce route on board and load on some gates
  • Manager/software
    • Roach is still crashing when loading bofs, but seems to happen at random
      • We will hold a focus meeting on Wednesday at 1:00 pm in the OLVBI room to explore further
      • May also try using a different roach
    • Ray is working on net thread; can currently receive but not send
  • Periodicity tests
    • Ryan tested fold mode and cal mode. As expected, fold mode does not show periodicities in TOAs, while cal mode still does show periodicities.
    • This points to rounding/precision issue in internal polycos generated in cal mode. Paul to update code to generate polycos with same precision as tempo.
    • Test plots: fold mode / cal mode
    • Ray and Paul will identify branch and patch guppi_daq
  • Test setup
    • Ray patched configuration to handle absence of if module
    • Works well with dealer/player
  • New wideband AP
    • Randy working on design of new board

Discussion

  • Resource allocations for Q4
    • We would like to have Melinda begin work on config tool; may require as much as 0.5
    • Get Justin back at ~0.2 level
    • Randy, Jason, John, Richard keep at same level
    • Paul can be reduced
    • Would be good to get Joe at ~0.1 level in case anything comes up

Date / Time of Next Meeting

  • June 22

-- RyanLynch - 2015-07-15
Topic attachments
I Attachment Action Size DateSorted ascending Who Comment
guppi_57184_AP_1001_check.pngpng guppi_57184_AP_1001_check.png manage 418 K 2015-06-15 - 11:19 RyanLynch Fold mode periodicity test
guppi_57185_AP_1001_cal_check.pngpng guppi_57185_AP_1001_cal_check.png manage 356 K 2015-06-15 - 11:20 RyanLynch Cal mode periodicity test
Topic revision: r2 - 2015-06-22, RyanLynch
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