These are notes on IVS observations from ops4, the four-monitor PC in the AuScope VLBI Operations room in Hobart.
The main control interface during an observation is eControl, which communicates with the PC Field System (PCFS) machines at the observatories. All the computers at the observatories have manes ending with their two-letter telescope ID:
There are four computers at each site that run the most important items of hardware or software. They are:
|PC Field System
|Linux PC that runs Field System software to control the antenna, DBBC and Mark5
|ssh, VNC (display 1)
|A Linux PC inside the Mark5 recorder which runs dimino, a program the PCFS communicates with to control data recording
|Windows PC that monitors the H maser, the CNS-II GPS clock, shows the wind speed and direction, and runs HMI: a GUI for controlling and monitoring the antenna
|VNC display 0
|A Windows PC in the DBBC which runs a server (and optionally a client) program to allow control and monitoring of the DBBC
|VNC display 0
Each of the above can be accessed either through a terminal via ssh or by starting up a VNC session. It is necessary to bring up the VNC sessions when setting up for an observation or when doing one of the regular ~2 hourly system checks. Given the slow network connection to Yarragadee it is not recommended to keep the VNC sessions up at other times.
VNC or terminal sessions can be started via the Application menu on ops4 in the top left of the desktop:
Applications -> AuScope Yarragadee -> VNC -> [choose the server]
VNC sessions can also be started up on the command line. e.g:
vncviewer -shared pcfshb:1 vncviewer -shared dbbcke:0
Below is a step-by-step procedure for making IVS observations on the 12m telescopes.
If it has not already been done, it may be necessary to prepare the schedule and procedure files. This is usually done well in advance, but here are the instructions:
The Digital Base-Band Converter (DBBC) takes the IF signals from the telescope and digitises them for the Mark5 recorder. The DBBC needs to be properly configured prior to an observation:
Next the Mark5 recorder needs to be prepared for the observations.
Lastly, check that the software on the timing PCs is running
At the end of an observation:
Gmail accounts have been set up for registration with skype and other services. The usual Observer password applies.