SPECTRAL

                  OBS\SPECTRAL Unit Bandpass IF_2 [/CONTINUUM Band_C  LO2_C]
    [/RECEIVER Irec] [/BAND code]

         Configures  the  spectral  correlator unit  number Unit.   Bandpass
    indicates   the contiguous  bandpass  to be used (20, 40, 80, 160 or 320
    MHz).  IF_2 is the second IF frequency of the  bandpass  center.  It  is
    rounded to the nearest multiple of 0.25 MHz (the LO3 frequency step).

         The /CONTINUUM option specified which  bandpass  should be analyzed
    to  produce  the  temporal  data.   The default is  80 % of the original
    band.

         Option /RECEIVER is used to indicate to  which  receiver  the  unit
    should be connected.

         Option /BAND is used to indicate the sideband code for  the  fourth
    frequency  conversion: 'U', 'L', or 'D'. Only D is available for 320 MHz
    bandwidth; only U or L are available for 20 and  40  MHz  bandwidths.  D
    gives  twice as many channels than U or L for the same bandwidth but the
    central channels suffer from Gibbs effect.