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TUNING

        [NOEMAOFFLINE\]TUNING [Ftune(GHz) Sideband  FIF(MHz)]   [/ZOOM  Key-
    word] [/PAGEWIDTH] [/INFO] [/FIXED_FREQ]

    Without arguments, the command displays the available bands of NOEMA Re-
    ceivers.  With the option /INFO several informations about the  receiver
    are displayed in the terminal.

    Different ranges are colorized:
    Black           : outside the receiver bands
    Dark grey       : in the receiver bands, but not accessible with the present
    White           : in the receiver bands, accessible with the present tuning

    With  arguments,  the  command defines the tuning of one of the band and
    represents it on the global view.

    Tuning syntax:
    Ftune   : Frequency to tune (in GHz)
    SideBand: Sideband where to place Ftune (LSB or USB)
    FIF     : Position where Ftune will be placed in the IF band (in MHz)

    Ftune must be in the current frequency main axis (REST by  default,  but
    can be changed with SET FREQUENCY command)

    If  a  source has been defined, its velocity (or redshift) is taken into
    account to convert Ftune to RF frequency.

    NOEMA observations are preferentially performed using a  limited  number
    of  LO  frequencies for which receiver performances have been optimized.
    Those frequencies are distributed all  over  the  receiver  bands  every
    500MHz  (the  so-called  tuning  grid).  The NOEMAOFFLINE\TUNING command
    takes this into account and  shifts  the  IF  center  frequency  FIF  if
    necesssary so that the LO tuning frequency matches the tuning grid.

    The  tuning  frequency  is  computed using only the source LSR velocity.
    With the Doppler tracking, the actual LO is slightly different from  the
    tuning  frequency.   Both  tuned and tracked LO frequencies are given in
    output.  With the option /FIXED_FREQ, the  command  ignores  the  tuning
    grid.


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Gildas manager 2018-05-18