The LO1 STATE binary table

The STATE binary table is an LO1-specific version of the STATE table described in GBT/SPN/004. It has one additional column, the frequency offset in Hz to associate with that phase.

FREQOFF

The frequency offset from the sky frequency in Hz. This offset is added to the sky frequency as given by the sky frequency formula described in the IF manager FITS file, GBT/SPN/010, to give the true sky frequency for each state. It is not an offset to the LO1FREQ value and it is not multiplied by SFF_MULTIPLIER in the sky frequency formula.

An example header and ascii equivalent list is therefore as below:

STATE Binary Tables Extension: Header
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XTENSION= 'BINTABLE'           / binary table extension
BITPIX  =                    8 / 8-bit bytes
NAXIS   =                    2 / 2-dimensional binary table
NAXIS1  =                   28 / width of table in bytes
NAXIS2  =                    2 / number of rows in table
PCOUNT  =                    0 / size of special data area
GCOUNT  =                    1 / one data group (required keyword)
TFIELDS =                    5 / number of fields in each row
TTYPE1  = 'BLANKTIM'           / label for field   1
TFORM1  = '1D      '           / data format of field: 8-byte DOUBLE
TUNIT1  = 'SECONDS '           / physical unit of field
TTYPE2  = 'PHSESTRT'           / label for field   2
TFORM2  = '1D      '           / data format of field: 8-byte DOUBLE
TUNIT2  = 'NONE    '           / physical unit of field
TTYPE3  = 'SIGREF  '           / label for field   3
TFORM3  = '1J      '           / data format of field: 2-byte INTEGER
TUNIT3  = 'T/F     '           / physical unit of field
TTYPE4  = 'CAL     '           / label for field   4
TFORM4  = '1J      '           / data format of field: 2-byte INTEGER
TUNIT4  = 'T/F     '           / physical unit of field
TTYPE5  = 'FREQOFF '           / label for field   5
TFORM5  = '1D      '           / data format of field: 8-byte DOUBLE
TUNIT5  = 'Hz      '           / physical unit of field
NUMPHASE=                    2 / Number of Phases if only Internal Switch Sig
SWPERIOD=            5.466E+00 / Switching period
MASTER  = 'Spectrometer'       / Switching Signals Master
EXTNAME = 'STATE'              / name of this binary table extension
END
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STATE Binary Tables Extension: Data (complete)
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ROW   BLANKTIM  PHSESTRT    SIGREF CAL   FREQOFF
1   9.96147E-02 .0000E+00     0     0    0.000E+00
2   9.96147E-02 .5000E+00     1     0    1.000E+07
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