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.. _bef-PuMRO:


Before observing
===================

**Notes :** The following instructions are for observing at L-band with the ROACH1 in baseband mode. The observed bandwidth is limited to 128 MHz.

After the standard checks:

1. On a desktop open the leap0 VNC session using
**VNCViewer** or **TigerVNC** and selecting **leap0:1**  *(ask for
password)*.

If it is not active:

2. Log on to the LEAP cluster :

    ``$ ssh -X user@leap0``     *ask for password*


3. Launch a VNC session once logged on to leap0 :

    ``leap0: $ vncserver &``



On the LEAP cluster (using VNC):
---------------------------------

Initial setup for the LEAP cluster:


#. Open a window (W1) and go to :

    ``$ ~/externalClient/Control/``

     This window will be used to start and stop data acquisition.

#. In W1: type a command to select L-band (and not P-band):

    ``$ ~/roach/scripts/setLband.sh``