[GMVAtech 27] Re: Action items from last GMVA technical meeting

[Jun Yang]

Hi Thomas,

The preob time can not be changed via editing the keyword preob_cal of the vex files or drudging.

At Onsala, our preob can be done in 8-11s now after investigating the hot-load in/out commands carefully. If one removes “&” in each local command in preob, the midob will just wait for the end of preob and may be delayed. While, this is acceptable since we need clean Tsys and visibility data.

The adjustment of TSETTLE will not help us to extend preob time.

Regards,

Jun




On 23 Nov 2018, at 09:11, Thomas Krichbaum <tkrichbaum at mpifr-bonn.mpg.de<mailto:tkrichbaum at mpifr-bonn.mpg.de>> wrote:

please correct me if I am wrong, but PREOB/POSTOB times
are not set in SCHED but in the local station procedure files.
This is something I could not change and should be changed at
the station (eg. in DRUDG).

In the station.dat from SCHED catalog, I only can adjust
TSETTLE, which is the time the telescope needs to settle
down after a slew. This is set already to 20sec.

best Thomas

On 11/22/18 4:28 PM, Walter Alef wrote:
Hi,

Just a reminder. Here is the list of action items.



Remaining action Items from the previous meeting

1. (Bach) Compile and publish station  pre-check list.
2. (González): invesitgate possibility for front-end tone injection at
   Yebes.
3. (Bach, Ef): improve Effelsberg bandpass @3mm
4. (Himmwich, Bach, Rottmann): Find solution for creating working FS
   procedures from vex when using PFB flexmode
5. (Rottmann, de Vicente): Compile information from stations about
   software tools in use. Setup software repository. Update:
   investigate whether JIVE github repository can be used.
6. (Krichbaum, stations): increase preob time from 10s to 30s.
7. (On, Mh): Measure gain curve before fall 2017 session.
8.  (Krichbaum): distribute document describing station calibration
   procedure on the GMVATech exploder.
9. (Correlator): establish calibration quality control at correlator.

New action items

1. (de Vicente): put scripts for tau calculation on github.
2. (Krichbaum, Correlator): investigate how feedback between PIs,
   correlator and stations can be improved
3. (Pidopryhora): Talk with Blanchard about Grafana usage for GMVA.
4. (Pidopryhora): Organize GMVA test in Jan/Feb 2019 (see minutes for
   details)
5. (Pidopryhora, JIVE): Investigate BHC tool for online fringe checks
6. (Campbell, JIVE): write requirement document for Mark6 media usage
   during globals.
7. (Rottmann, Sanchez): Build flexbuf capabilities at PV after
   bandwidth upgrade.
8. (Jung, Rottmann): Organize Mark6 shipment to KVN for next session.
9. (Brisken): investigate possibilty for a meeting in Soccorro.

--



Regards,

Walter



Dr. Walter Alef

Head, VLBI Technology

Max Planck Institute for Radio Astronomy

Bonn, Germany

walef at mpifr-bonn.mpg.de<mailto:walef at mpifr-bonn.mpg.de>=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

For private email use: walef at netcologne.de<mailto:walef at netcologne.de> ---------------------------------




--
Dr. Thomas P. Krichbaum
Max-Planck-Institut fuer Radioastronomie
Auf dem Huegel 69
D-53121 Bonn / Germany

Mail: tkrichbaum at mpifr-bonn.mpg.de<mailto:tkrichbaum at mpifr-bonn.mpg.de>
Tel.: (Germany +49)-228-525-295
Web : http://www.mpifr-bonn.mpg.de/research/vlbi
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