Diff for "AbsorberObs"

MAMBO observations on Absorber: How to proceed

Ideally the measurements should be done with the moving telescope to be as close as possible in the observation condition, i.e. to have also the same synchronization signals as during real on-sky observations.

The absorber should lie on the ABBA rack and it has to be moved into the entrance window by hand.

   > Pick-up a source  at the requested  elevation (see XEphem)
   pako> source G34.3 /grep /cat ihet
   >>> G34.3           EQ 2000  18:53:18.56  +01:14:58.2  LSR 0.0  FLUX 19.90 0.0 PROJECT CALIB
   pako> source ABSORBER EQ 2000  18:53:18.56  +01:14:58.2  LSR 0.0  FLUX 19.90 0.0 PROJECT CALIB
   > After this, test the different observing modes with different parameters:
   pako> onf 8 80
   pako> onf 20 40
   pako> bmap 360 360 5 6
   pako> bmap 360 290 5 6
   pako> ...

The observations needed should be mainly onf 8 80, but longer scans, and other observing modes should be also tried. JP recommended to set the wobbler throw to 40 to avoid putting to much stress on the wobbler itself.

Note that the ABSORBER test must be done with a wind speed lower than ~14 m/s. Anyhow, if the wind is high, keep on with it. It is better than nothing.

ABSORBER with the antenna stopped

In the case the antenna need to be on stow, absorber observations are still possible. These observations are made with one phase (i.e. total power).

The way of doing it is the following:

• a) ask the operator that you want to use the telescope without moving it.

  b) run onf-total scans phase