.. _EN_Initial-setup:

*************
Initial setup
*************

.. _EN_overall_setup:

Antenna overall setup
=====================

When opening a DISCOS observing session, it is necessary to perform a setup 
which includes the antenna unstow, the mount configuration in tracking mode, 
the minor servo setup. This is done by means of a unique command, which is 
specific for the wanted receiver, to be written in the **operatorInput**. 
The currently available choices are::

    > setupSXP     for the SX-band receiver
    > setupCCC     for the C-band receiver 
    > setupMMC     for the M-band receiver
    > setupKKC     for the K-band receiver
    > setupQQC     for the Q-band receiver

.. admonition:: WARNING:  

    * It is necessary to manually select the observing focus using the hardware 
      IF switch located in the control room. The figure below illustrates this
      rack.  

.. figure:: images/Focus_switch.jpg
   :scale: 80%
   :alt: Hardware switch in charge of selecting the IF lines to be used, i.e. selecting the observing focus.
   :align: center

The general setup command sets the antenna mount, the minor servos, the selected 
receiver and the default backend (TotalPower) according to **default 
parameters**. The antenna mode is set to **ProgramTrack** (allowing tracking 
and the execution of schedules), while the Local Oscillator frequency and the 
bandwidth are set as illustrated in the following table.


.. tabularcolumns:: |c|c|c|c|c|c|

+---------+----------+------------+----------+-----------+-----------------+
|Receiver | LO freq  | Frontend   | Backend  | Observed  | Observed        |
|code     | \(MHz\)  | RF band    | IF band  | bandwidth | band            |
|         |          | \(MHz\)    | \(MHz\)  | \(MHz\)   | \(MHz\)         |
+=========+==========+============+==========+===========+=================+
| SXP     |2020      |2200-2360   |50-730    |160        |2200-2360        |
+---------+----------+------------+----------+-----------+-----------------+
| SXP     |8080      |8180-8580   |50-730    |400        |8180-8580        |
+---------+----------+------------+----------+-----------+-----------------+
| CCC     | 4600     |  4620-5020 |   50-730 |    400    |    4650-5020    |
+---------+----------+------------+----------+-----------+-----------------+
| MMC (1) | 6956     |  5100-7250 |   50-730 |    500    |    6356-6856    |
+---------+----------+------------+----------+-----------+-----------------+
| KKC     | 21869    |21500-23000 | 50-730   |  400      |  21969-22369    |    
+---------+----------+------------+----------+-----------+-----------------+
| QQC     | 42850    |39000-43500 | 50-730   |  400      |  42950-43350    |
+---------+----------+------------+----------+-----------+-----------------+


Notice that the true observed band depends on the **intersection between the 
frontend IF band and the chosen backend filter**. The actual observed 
bandwidth and the band starting frequency are recorded in the output files 
(see :ref:`EN_Appendix-C-Output-files`).

(1) For this setup, the FITS file will **NOT** report the actual values 
relative to frequency and bandwidth, as the present DISCOS release does not take 
into account the different conversion taking place for this receiver. 
  

Logfile
=======

The default logfile is named **station.log**. 
If the user wants to change it::

    > log=[logfilename]  (without extension)

Logfiles are stored in a dedicated folder (see Retrieving the data).
**When schedules are run, a new logfile is automatically started**, and it is 
named after the schedule: [schedulename].log.