Notes on running the Multibeam Correlator Software with tkmulti

FIRST

• Log in to ARTHUR as MULTI.
• Type multi at the prompt.
• Reply yes when it asks whther you wish to continue.
• NOTE: This program should be run from the login directory (this is where you are after logging on to ARTHUR) or from multi$work.

SECOND

• Start a Xsession on the computer of your choice.
• If necessary, allow access to your computer by ARTHUR, (xhost +arthur).
• Telnet to Arthur and Login as MULTI.
• Set Arthur to produce output on your screen as follows:

        xdisplay xxxx

or

        xdisplay xxxx /serve=n

where xxx is the name of your unix box (and optionally, n is the number of the desktop eg. for vncviewer running on oddjob:2 you would use xdisplay oddjob /serve=2). If this doesn't work try....

        SET DISPLAY/CREATE/TRANSPORT=TCPIP/NODE=xxxx/SERVE=n

• Create 3 DECTerms as follows

         CREATE/TERM
         CREATE/TERM
         CREATE/TERM

• On a DECTERM window start the correlator driver MBCOR

            ART$ START_WINDOWS
            ART$ MBCOR

THIRD

• Log in to oddjob. If necessary route the display to your screen, using xhost oddjob and

            setenv DISPLAY xxxxxx:0
       or   xdisplay

• Start tkmulti

            tkmulti

Commands for tkmulti

• ftp the schedule to the multi$sch directory on ARTHUR.
• If pulsars are using the telescope, ask the controller to stop the timing schedule.
• Make sure that the controller has passed command to ARTHUR.
• Using tkmulti
• In tkmulti's Multi command entry ENABLE ANTENNA
• (You can take data from a stationary or otherwise positioned telescope - eg controller, pulsars, TELC program on ARTHUR by ommitting this step, or by DISABLE ANTENNA, if you have previously enabled it). THE TELD program on ARTHUR will show you who currently has control of the telescope.
• To rotate receiver or shift the Reference beam type ENABLE FCC
• You should see OK on the logging screen and Anenna enabled, fcc enabled on the multi display.
• To position a beam on source (rather than the centre of the array, type ENABLE REFBEAM.
• Enter the schedule name (case insensitive - without directory or extension) in the Schedule box. If the schedule is OK, multi will return the scan details in the tkmulti logging screen. (Sched - File Browse mostly hangs tkmulti, but sometimes it'll bring up the schedule directory listing on ARTHUR. Unfortunately it then refuses to find the selected file!) Use a spare window logged into ARTHUR to list the mutli$sch directory.
• Pull down the Sched menu and click START (Don't use the Top line start button)
• Check the displayed frequency and bandwitdh are correct.
• To interrupt a schedule at the end of the current scan, pull down the Sched menu and click FINISH. To interrupt immediately, click the Stop button (top of screen). In both cases if you have finished, observing, it is useful to type CLOSEFILE in the multi command box (bottom right).

• to change mbcor configuration, in Multi command entry (bottom rightish)

CONFIG xxxxxx
(MB1MOD is a single beam setup, MB4MOD is a 4 beam setup - both 64MHz)

• to change centre frequency

FREQUENCY nnnn.nnn       (MHz)

• to change bandwidth

BANDWIDTH  xx           
and CONFIG xxxxxx where xxxxxx is a suitable config file

• To start the correlator integrating
• use START SCAN button (top leftish)
• To stop use STOP button
• Utility SAVE config (bottom right) will save current tkmulti settings

• shutdown the multi / tkmulti processes completely as follows

in tkmulti's Multi command entry type QUIT (this shuts down multi).
Then Exit (bottom right) tkmulti.

This will leave the multibeam correlator running on ARTHUR, but that can be left unless you wish to logout. (multi /tkmulti can be restarted for later tests if the mbcorr processes are left running). Multi should be started first, then tkmulti.

To shut down MBCOR on ARTHUR, type QUIT in the MBCOR window. Logging out of the DECTERM where you started MBCOR is the easiest way of closing all the MBCOR windows.

• Leave everything running, but release control of the telescope by typing DISABLE ANTENNA in tkmulti's multi command window. (It is also a good idea to type Closefile - see Problems section!)