1. Data Separation
Before executing the calibration tasks, the high (chunk 16) and low (1,2,3,4,5,6,7,8,9,10,11,12) spectral data are separated into two working files, 060512_rx0.lsb.tsys.hr and 060512_rx0.lsb.tsys.lr:
uvaver vis=060512_rx0.lsb.tsys select='window(1,2,3,4,5,6,7,8,9,10,11,12)' \ options=nocal out=060512_rx0.lsb.tsys.lr uvaver vis=060512_rx0.lsb.tsys select='window(16)' \ options=nocal out=060512_rx0.lsb.tsys.hr
2. Bandpass Calibration
Then, we solve for the antenna-based bandpass:
smamfcal vis=060512_rx0.lsb.tsys.lr select='source(neptune)' edge=3,3 \ refant=3 interval=600 smamfcal vis=060512_rx0.lsb.tsys.hr select='source(neptune)' \ weight=2 refant=3 interval=600 smooth=7,1,0.9 options=msmoothNote that a moving smoothing is performed prior to solving for the antenna-based bandpass in order to improve the signal for the high spectral resolution data. Please check up the bandpass solutions:
smagpplt vis=060512_rx0.lsb.tsys.lr device=/xs \ yaxis=amp,phase \ options=bandpass polyfit=5 \ nxy=2,4
smagpplt vis=060512_rx0.lsb.tsys.hr device=/xs \ yaxis=amp,phase \ options=bandpass polyfit=5 \ nxy=2,4
If the solutions are satisfying, then they can be applied to the data:
uvaver vis=060512_rx0.lsb.tsys.lr options=nocal \ out=060512_rx0.lsb.tsys.lr.bp uvaver vis=060512_rx0.lsb.tsys.hr options=nocal \ out=060512_rx0.lsb.tsys.hr.bp
3. Antenna Gain Calibration
The phase reference source (0133+476) can be split from the lower-spectral-resolution multiple source file that has been applied with bandpass corrections :
uvsplit vis=060512_rx0.lsb.tsys.lr.bp \ select='source(0133+476)' options=nowindow mv 0133+476.216816 0133+476.lsb.tsys.lr.bp % rename the file
Then we solve for antenna-based gain (phase-only):
selfcal vis=0133+476.lsb.tsys.lr.bp \ refant=5 interval=.5 options=pha
One may check up the gain solutions. If the solutions are good, then the gain table can be copied over to both the high and low spectral resolution data files:
gpcopy vis=0133+476.lsb.tsys.lr.bp out=060512_rx0.lsb.tsys.lr.bp \ mode=copy options=nopass gpcopy vis=0133+476.lsb.tsys.lr.bp out=060512_rx0.lsb.tsys.hr.bp \ mode=copy options=nopass % reset the solution interpreation tolerance to a long time interval puthd in=060512_rx0.lsb.tsys.lr.bp/interval value=600 type=double puthd in=060512_rx0.lsb.tsys.hr.bp/interval value=600 type=double
One could apply the gain solutions to the data or leave the gain table in the data files and apply them while executing relevant tasks. To this point, the calibration for bandpass and antenna gains are completed.