SOLVE RF_PASSBAND

 

        CLIC\SOLVE RF_PASSBAND [da] [dp][/PLOT]

    Solve for  passband  calibration  curves,   by   fitting   it   to   the
    amplitudes  and  phases  measured on a strong continuum source (passband
    calibrator). The behaviour of this command depends on the  current  mode
    of rf passband calibration (Frequency or Channel).
      - for frequency-dependent rf passabnd calibration: the  resolution  is
        normally done using all the spectral subbands plotted together, as a
        function of intermediate frequency. It should be done separately for
        upper  and lower side bands. A single frequency-dependent polynomial
        is fitted, a high degree might be necessary for the phase,  if  band
        edges are used (up to 20 is feasible).

      -  for channel dependent rf passband calibration: (i)  for  continuum,
        the   data   itself  is   directly   stored   as calibration  values
        (this  gives  a channel-dependent passband curve).   In  addition  a
        polynomial   is   fitted   and   optionally  plotted  (this  gives a
        frequency-dependent passband curve).

        (ii) for spectral subbands, polynomials are  fitted  and  optionally
        plotted, as a channel-dependent passband curve.

    The degrees for polynomials are 'da'  for  amplitude,  'dp'  for   phase
    (defaults  0 and 1).  X unit must be channel.  Spectral subbands must be
    plotted  separately.   The  current  index  should  contain  calibration
    observations  of strong continuum sources.  Command STORE should be used
    next to store this function in the header of source observations.

    Both channel dependent  and   frequency   dependent   curves   will   be
    stored;  Use  command  SET RF_PASSBAND FREQUENCY|CHANNEL to apply one or
    the other.

    Option /PLOT will plot the polynomial fits over the data.