USNO VLBA Support Meeting

Date: May 19th 2015

Time: 11 am Mountain, 1pm Eastern

*Phone: 434-817-6584 rm 152, Socorro

Attending:

USNO: Nicole, Alan, Chris, Dan, John

NRAO: Walter, Ephraim, James, Jim

Agenda

Status
  • Correlator:
    • Walter and James will visit next week (Tu-Fri Walter, Tu-Th James)
    • Waiting on power audit of room before starting Phase 2. Action USNO: Dave to get audit done
  • VLBA Observations
    • Daily Observation Report for April
      • There were a few backup observations at St. Croix. They showed the expected elevated RMS.
      • ACTION Ephraim will follow up on SSD inventories.
      • LONG TERM: Track SSDs through TRACK? USNO and NRAO agree this may be worthwhile.
      • At the end of the month Apr28 had 10 outliers with very high RMS.
        • Chris may look into this to determine the source of issues. It is probably not due to any telescope problems, more likely due to fringing and source selections.
      • On Apr 24 & 27 (n5114, n5117), no fringes were found expect only in a single band in some cases. UPDATE: Nothing found for equipment work orders or in logs.
      • On April 14 (n5104), "weird" fringes were seen and it may be recorrelated. UPDATE: NRAO logs show there was a DBE resynch, which normally causes enough of a problem to have NO fringes.
    • 4 station observations - twice-monthly
      • All recent runs have been fine, April 1 re-run needed due to DiFX issue.
    • 5 station runs - twice weekly
      • ~ 3-4 more weeks
      • Dual correlation models (CALC9 & CALC 11) as part of comparison for eventual switch to CALC 11.
      • Question - are there additional runs needed beyond this? USNO: No, the results being provided are expected to be enough.
  • Open issues
    • Plan going forward is to focus on observation information only, no correlator discussion.
  • Next meeting on June 11th (Thursday)

-- EphraimFord - 2015-05-18
Topic revision: r2 - 2015-05-19, EphraimFord
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