... At some point you realize that data is not (or is no longer) being written to the disk This can be caused by two things: . ... To fix, just type "disc on". ... To see if this is your problem, go to some other window on observer and type "df -k /export/obs8". ... That is, type: . ... This may be caused by you having typed either a square or curly bracket ([ or {) on the datataking window. ... To fix, go into the "datataking" window and type "pnt tol 10.0" to reset the pointing tolerance to 10 seconds...

... 2.3 Data acquisition Spectra generated by the Multibeam correlator contain the usual structure seen in spectra from other H i instruments: a bandpass spectrum which is the sum of the sky , ground and receiver temperatures multiplied by the product of the filters in the receiver chain; superimposed on this is a noise ... Note also that sources extended much beyond ,40 arcmin can be imaged poorly in HIPASS images because of the bandpass sidelobe effect described in Section 3.3. ...