Keywords: point

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## Interferometer pointing

Pointing sources can be observed with the OBS command

        OBS\POINT /ANTENNA Iant /LENGTH 60

in INTERferometry mode if only antenna `Iant` is to be pointed, or

        OBS\POINT /LENGTH 40

if all antennas must be pointed.

Data reduction can then be done with the `CLICSOLVE POINTING` command in CLIC, working on the [OBS.POINTING] directory. Select a set of pointing scans with the `CLICFIND` command (use `SET PROCEDURE POINT`) and process these scans with `CLICSOLVE POINTING [/PLOT] /OUTPUT Date.INT`. By default data is appended to that file, add argument `NEW` after the `Date.INT` file name to create a new one.

For continuum sources, you should use `SET SUB C01 TO C10` and `SET AVERAGE METHOD VECTOR`. You might want to do an RF_PASSBAND calibration to be able to average both sidebands (`SET RF ON, SET BAND AVERAGE`); this is absolutely necessary at high frequencies to improve signal to noise ratio. If observing SiO masers at the standard frequency (86.051 USB LOW), use `SET SUB C02` and `SET BAND UPPER` to process the data in CLIC.

Then, use POINT the same way as for the RADIO (single-dish) data.

Next: Limited radio pointing determination Up: Radio Pointing Previous: Full sky, single-dish radio Contents Index