Preparing observations at 3.6cm


Observations with the Effelsberg dish are easy and straightforward. However you must well prepare the observations, be strict with typing the operational command and know what you are doing. All the settings of the telescope receivers, specifications of the observing area on the sky etc. can be done with a few files. The files should be prepared on the VAX computer standing on the right of the operating console.



What you need


1.      The position of the target (e.g. IC10) in B1950 coordinates

2.      The size (in arcmin) of the area on the sky you want to map. Single map, so called scan, consist of several subscans which correspond to single scanning of the telescope along RA or DEC through  the sky area. At 3.6cm the standard step between subscans  is 30". For example the scan 17 x 16 will be done in 2*16+1=33 subscans with 30"’ separation.

3.      The name of your amplitude calibrator. Take 3C286 if visible above the horizon or 3C138 (they are almost on the opposite sides of the sky so always one of them is visible).

4.      The name of your pointing calibrator. Find a nearby strong radio source close to your target in the so called “Helmut" catalog (Kuhr). It is the green book in the operating room in Effelsberg. The important is the “SNAME" of the source, because it is recognized by the operating program. An example of SNAME: 3C48. You use this name during observations.


Needed files:                             - files with aliases for setting the receiver and the mod

                                                 of observations - already prepared by R. Beck

36back.obs                             - backend settings - already prepared

36point.obs                             - settings for cross-scan observations (for pointing) of

- the amplitude or pointing calibrator -prepared

36calkl.obs, 36calkb.obs        - parameters for making a small map of the amplitude

  calibrator - prepared

ic10b.obs, ic10l.obs         - parameters for a map of your target for scanning in RA and DEC (IC10 in this case) - you must prepare it, see below. Nonzero value for VLAM or VBET must be in the last of this two rows. Change DLAM, DBET, OLAM, OBET, SRP2, SNAM, SLOP, SBOB



On the VAX machine eff100 prepare the observing file (e.g. ic10b.obs):


login: observer

password:                                                     ask the operator

set def  [observer.kont.36]                             change directory to 6cm

dir                                                                  list the directory (ls also works)

dir  *.obs                                                      list files

type                                            list the file

print                                            print

copy  n4569l_big.obs  ic10l.obs                    copy file

purge  ic10.log                                              delete file

edit  ic10l.obs                                                start editing ic10.obs

            use arrows for movements


            ‘           - delete

            PF4 -delete line

            ctr-Z  and exit -  to exit editing with saving or with quit to not save

Example: ic10b.obs, ic10l.obs