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operations:down_under_2015_09_01_minutes [2015/09/02 16:02] (current)
Ed Himwich created
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 +ACTION ITEMS
  
 +Ed: Ask Dan about how large an az/el effect is needed to explain
 +southern source issue
 +
 +Jim/Jamie: Phase-cal measurements
 +
 +Jim: re-do case 1 of auto-stow tests
 +
 +Ed: install new auto-stow code at Ke and Yg once Jim finishes test
 +
 +Jim: look at stability of Ke DBBC
 +
 +Jim: Yg windstow system needs repair
 +
 +Ed: send NTP configuration information to server NTP to LAN
 +
 +Jim: change antennas to use FS computer as NTP server once those
 +computer serve NTP
 +
 +Stuart: finish upgrade for ONSOURCE test in ANTCN
 +
 +Stuart: switch to time model "​computer"​
 +
 +Ed: check with Jay on how heat tape current is run
 +
 +Jamie: replace Yg ifpic server
 +
 +NOTES
 +
 +First items:
 +
 +1. New issues from Warkworth
 +
 +Stuart: nothing new, in maintenance week and had horrendous weather
 +preventing replacement of sun shield
 +
 +2. New issues from AuScope
 +
 +Jim: covered below
 +were expecting to take prototype feed off but will stay
 +another month, so Hobart26 will continue to sub
 +
 +3. Phase-cal measurements At AuScope (Brian)
 +
 +Brian: Cable delays would be preferable
 +Use bpcal as outlined in e-mail?
 +Jamie: No measurements have been made, but could be
 +Brian: GGAO had a few picosecond to 10-20 picosecond
 +Ed: Will ask Dan how large effect might explain the
 +variation
 +use aecho=on to log antenna position
 +Jim/Jamie: use monica or TRACK output for position
 +
 +4. Clock jumps
 +
 +Any Maser comparison data showing jumps?
 +
 +Brett: Jim P. waiting to find out when to look
 +Brett: also recording power transients
 +Ed: should be some analysis news in the next week or so
 +
 +Most recent experiment analyzed was r1700 (Aug 11), which is
 +not recent enough for cross check
 +
 +Analysts backed down a bit on how much data is being lost, but still
 +say it adds significant extra work
 +
 +5. Auto-stow tests
 +
 +"​Synopsis"​ of tests, redo at least Jim's test 1
 +
 +Jim: will try to redo test
 +Ed: will install at other antennas when Jim is satisfied (hopefully
 +soon)
 +
 +New (not discussed before):
 +
 +6. Katherine has completed aov004
 +
 +DBBC unstabled --- several clock drifts
 +
 +Jim: need to look at DBBC
 +
 +7. Did Hobart observe AOV004?
 +
 +Jim: was scheduled tag-along and observed another experiment
 +
 +8. Yarragadee has completed r4702
 +
 +1905 UT: Windstow activated. Appears to be a misread on windy
 +the anemom (wind speed 9999 km/h).
 +Reset the windyg box to bring the average windspeed back down.
 +Misreads continued. Did cold reset on windyg.
 +Still the occasional misread. Could be on the anemometer end (An
 +insect on the ultrasound transducers?​)
 +
 +Jim: hardware issue device not reliable, same design as used at
 +other antennas, needs to be repaired
 +
 +9. Kath12 R4701
 +
 +ACU time difference outside limits requiring use of fmset
 +Missed Scans 233-1048b to 233-1051c. FS reported
 +clock error at 1050Z. Session started at 1830z.
 +-ACU Clock jump or drift was 16 hours after session started.
 +
 +Ed: FMSET won't help this problem, formatter and FS and computer
 +agreed, NTP configuration issue? First error 10:48:58, last
 +at 10:51:27, about 2:30 seconds, SNTP updates are at 30 second
 +intervals. Problem cleared on its own, 10 seconds after 5B time
 +reset
 +
 +Ed: will send line to set FS computer as NTP server for local
 +network
 +
 +10. Wark12m : Registers Master Status
 +
 +That's the way I read it also. When its windy we see the HMI
 +interface the "POS ERROR" fields go red as the error is > 1/10000 of
 +a degree. So the current position goes red also as technically its
 +not "on source",​ but the error might be of the order 6/10000 of a
 +degree ( ~2' ) so still well within the FWHM of the beam even at
 +X-Band. The current "​antcn"​ code is if the current posn is > 1/1000
 +degree from the commanded position or the AzMasterStatus or
 +ElMasterStatus are not 0, then flag not tracking. I can "​relax"​
 +these limits for being on-source. Just take "​current posn" to
 +"​commanded posn" and ignore the Status registers (well still log
 +them if not 0, but don't set the flag to be not tracking).
 +
 +Stuart: will work on this during maintenance week
 +
 +11. R4697 Ww Day 313 July 23
 +
 +The overwhelming majority of scans have produced no fringes on WW
 +baselines -- the WW-KK baseline, for example is seeing ~1 scan with
 +fringes per hour. On top of that, the SBD is varying wildly -- a
 +rare pair of two successful scans within 10minutes of each other on
 +the WW-KK baseline jumped nearly 1us.
 +
 +Stuart: surrounding R1s were good
 +
 +12. R1697, R4697, R1698 Ww
 +
 +all have 1 second clock offset
 +
 +Stuart: operator was checking FS time, using :rate" model
 +Ed: should check against computer and probably set model to
 +"​computer"​ anyway
 +
 +13. no fringes for Wark12 AUA006 even when antenna was tracking. (May
 +12)
 +
 +S: mutiple sessions in this series had poor yield
 +J: DBBC problems, antenna issues
 +R: in this experiment, antenna reported tracking
 +
 +14. Ww R4701 cold weather trips motor. Session stopped, antenna moved up
 +and down to warm oil, then session continued. (question - The
 +antenna moving for three hours did not warm oil?)
 +
 +S: low elevation, with a long gap, oil gets more viscous, temp.
 +unusually below 0C
 +E: GGAO uses heat tape
 +S: getting current through cable wrap
 +E: how do Jay solve that
 +
 +Old
 +
 +15. Warkworth GPIB controller progress?
 +
 +S: more stable lately, windows box had a virus interferring with
 +network, may have helped
 +
 +16. AuScope NTP update
 +
 +Jim: NTP updated on all FS system and Mark 5b
 +Ed: suggested using FS for 5B's server
 +
 +17. Hobart VC LO progress
 +
 +Ed nudged Mike to look into it, has two to send, need to figure out
 +shipping arrangements,​ probably between Brett and Don Sousa, Don is
 +unavailable right now.
 +
 +Brian: It could be a few weeks.
 +
 +18. Yg replaced ifpic server?
 +
 +Jamie: working on it
 +
 +Extra
 +
 +19. GGAO 12m brake issue
 +
 +Brett: suggested telecon between people working on these brakes
 +Ed: will ask Chris is available, should include Arecibo
 +Jim: ATNF has the same antenna, but it is used less
 +Brett: if it ain't broke (at other antennas), don't fix it
 +Ed: Godwin reported that Kevin Sinclair designed main brake
/home/www/auscope/opswiki/data/pages/operations/down_under_2015_09_01_minutes.txt · Last modified: 2015/09/02 16:02 by Ed Himwich