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.
1. The position of the target (e.g. IC2574) 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 telescope azimuthal scanning of the sky area. At 6cm the standard step between subscans (e.g. in elevation) is 1’. For example the scan 45 x 36 will be done in 37 subscans with 1’ 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: 3C231.0. You use this name during observations.
obsein.pro - files with aliases for setting the receiver and the mod
of observations - already prepared by R. Beck
6back.obs - backend settings - already prepared
6point.obs - settings for cross-scan observations (for pointing) of
- the amplitude or pointing calibrator -prepared
6caldh.obs - parameters for making a small map of the amplitude
calibrator - prepared
IC2574.obs - parameters for a map of your target (IC2574 in this
case) - you must prepare it
On the VAX machine eff100 prepare the observing file (ic2574.obs):
password: ask the operator
set def [observer.kont.6] change directory to 6cm
dir (or ls) list the directory (ls also works)
dir *.obs list files
type obsein.pro list the file obsein.pro
print obsein.pro print obsein.pro
copy n6822.log ic2574.log copy file
purge ic2574.obs delete file
edit ic2574.log start editing ic2574.obs
use arrows for movements
‘ - delete
PF4 -delete line
ctr-Z and exit - to exit editing with saving