At the start of each check experiment
N.B. For hybrid setups and checking coherence see the separate notes at Mopra setup notes. Some of the software setup described below may also be needed for this hardware testing.
If starting up from scratch, follow these notes.
The following software needs to be run for setup and running an experiment:
The integration time already setup is shown in the camon window (use /mopra-x in camon to see all bands). If it needs to be reset use:
> newcain cycle <sec> - to setup the integration cycle time in secs.
Default cycle time has been 10s but mm observers often use ~2sec. For VLBI 5sec may be more appropriate. To see what else "newcain" can do just type "newcain" without any parameters and it will give you a list of commands. CAUTION: Please only use "newcain" if you really understand what you are changing.
> attest &
Generally automatic attenuation in vlobs should be turned off. It often gets the wrong value and SDO measurements saturate, giving no Tsys values. Select the "atten" tab in attest.
Coarse attenuators should be set to "
For the 22 GHz receiver with the quarter-wave plate for circular polarisation the setup has mm-attenuators at "
Each frequency has a separate focus setting. To set this, choose the "focus" tab in attest and move the slide to the correct value and click "Go".
To stow the antenna exit vlobs and choose the "stow" tab in attest. Then click the "go" button.
Mopra is run by the program
TCS should not be run at the same time as
Copy the sched input file from the atnf ftp area for this experiment, e.g. v001a_Mp.com. This needs to be converted into a vlobs file. Normally these should be copied onto bigrock at ~atcaobs/sched_vlbi.
> atcasched > @v001a_Mp.com > write > exit
To run vlobs log into bigrock as observer and run "vlobs". There is a startup bug, it can take dozens of times before it actually starts. If your terminal is full of garbage characters, use the "reset" function of the terminal (middle mouse button on an xterm, or a menu option on fancy terms (e.g. Unsed "terminal" on gnome-terms.
The main vlobs commands are:
Usually Mopra data is recorded remotely to Narrabri, onto cavsi2.
Run cdisko as normal but make the following changes:
Record as normal
At the end of the session (or during as well if required) you need to copy the mopra logs down to Sydney. Log onto any machine in Epping as "vlbi" and run the command mopralog.sh
This will invoke rsync to copy down the logs directory.