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Command SOLVE GAIN is used mainly at the observatory. With
Walsh
switching on the LO1 and demodulation in the
backend, the sidebands which are superposed after the LO1 conversion
can be separated. This allows the receiver sideband rejection,
, to be measured by computing the ratio of the image sideband
over the signal sideband amplitudes. This is done on the uncalibrated
data by dividing each sideband by its
and correcting for the
possible difference in atmospheric opacity between the sidebands.
This command also derives the mean baseband phases that are fed back
to the system so that further online averages do not suffer
decorrelation.
Gildas manager
2024-04-17