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lbaops:rtfcobs

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# Observatory Setup

At each observatory you need to run the obs.pl program. This connects to the correlator processors at Parkes and copies the requested data down the network. Obs.pl should be run remotely by who ever is running the fringe test, as they sometimes hang and have to be restarted. This should be run after the correlator processes are started. Once you have logged onto the recorder PCs, you need to cd to the directory where the data is being recorded then run obs.pl. If the recorder is currently been run via cdisko or other programs which use “recorder_server”, then an alias “recdir” is setup which will automatically change to the correct directory. Usage will normally be something like:

> recdir
> obs.pl

On Mark5 systems you will have to “cd” to whatever directory the Mark5 is dumping the data.

If disk recording is moved to a different directory, obs.pl will have to be stopped and restarted in this new directory.

## Logging Onto Observatories

The recorders are running on the following machines and usernames. Note if remote recording is being run, you need to log onto the machine where the data is being written to disk NOT the machine where the data is received from the telescope. You can only connect via ssh.

 Observatory Host Username Path . Notes Parkes pkvsi1-ext.atnf.csiro.au vlbi Parkes pam-store.atnf.csiro.au vlbi /data ATCA cavsi1-ext.atnf.csiro.au vlbi Mopra mpvsi1-ext.atnf.csiro.au vlbi Hobart hovsi.phys.utas.edu.au vlbi /mnt/flexbuf_0/fringtest Ceduna flexbuffcd #1# observer /mnt/fringtest Tid 203.5.58.205 vlbi ASKAP cira10.atnf.csiro.au vlbiobs Wark30 156.62.231.134 oper /raid1/etransfer/wa -nofilter for obs.pl Hart#2# 192.96.5.244 oper Katherine#3,4# flexbuffke observer ~/vbs -nofilter for obs.pl Yarragadee mk5yg oper /data/fringtest

#1# Log onto hovsi first then use rtfc-tunnel to ssh with appropriate tunnels setup

#2#RTFC does not work well to Hart directly. Try the following:

sshhartvdif
cd data
<Check out what files have been dumped>
sharethart <file>

On pam0

This is not quite right yet

cd /data/hart
gethart
hart
obs.pl

#3#

Manual mounting of data via vbs_fs utility is required, Then you can fringe test any time range you need

The following can be done until RtFC supports this automatically. Note this needs to be redone very time you want newer data than was selected earlier (ie the links etc are static).

fusermount  -u /mnt/vbsRFTC   # May not be required if first
vbs_fs -I 'v*' /mnt/vbsRTFC
cd vbs
\rm -f *                      # Run with caution! Not strictly necessary every time
ln -s /mnt/vbsRTFC/* .        # Or (e.g.) ls -s /mnt/vbsRTFC/v255*
obs.pl -nofilter

#4#

Katherine DBBC3 is not supported by Sched. You will need to manually create vexfile to match setup. Note there are usually multiple independent streams of data. Usually it will be 2 streams, one for each pol. The bandwidth will probably not match other stations - e.g. probably 32 MHz channels. Also There is currently easy way to select which pol RtFC chooses.

Note that at Parkes we also record data onto pam-store-ext. In such cases you need to run obs.pl on the machine where the data is being recorded - see the note below.

## Easy startup

The script rtfc_obswin.csh will start up 6 xterms and log into the recorder PCs. If you have ssh passphrases setup, you will not need passwords.

## Environment settings

The following environment variables need to be set (or added to existing paths)

 Example PERL5LIB /home/vlbi/evlbi/RtFC PATH /home/vlbi/evlbi/RtFC RTFC_CONTROL Optional, defaults to localhost RTFC_CORRELATOR Optional, defaults to localhost RTFC_ANTID E.g. 'At', defaults to 'Tt' RTFC_ANTNAME 'ATCA Phased array', defaults to 'Test Antenna'

## Remote recording

If you are recording to a remote recorder you need to ensure RTFC_ANTID (and RTFC_ANTNAME) are set. For remote recorders which generally only record data from a single teleacope this will normally be setup in the login scripts. cave-store can record data from Mopra and ATCA. Aliases have been setup “mopra” and “atca” to setup the environment. E.g.:

> atca
> obs.pl

## Inverted Spectrum

Normally if the telescope IF spectrum is inverted, a flipped DAS profile should be used. However for 64 MHz recording the spectrum cannot be “flipped”. If you know or suspect the band is inverted you can run obs.pl with the “-invert” option and it will flip the data for you.

> obs.pl -invert

## Mark5b

Obs.pl supports Mark5B recording, as long as the “mark5access library and utilities are installed and accessible. Note this depends on the VLBI schedule having had explicit fringe test times added. Transfer times from Hartebeesthoek are terrible slow - usually it is faster to transfer the file by some other means then run obs.pl on a local machine.

lbaops/rtfcobs.1581912234.txt.gz · Last modified: 2020/02/17 15:03 by chrisphillips