The new 1,3 cm primary focus receiver is the only receiver until now, which has the possibility to fastly switch between two beam positions. Therefore we adopted the LDSWITCH procedure for this receiver. That means: This procedure only makes sense in conjuction with the 1,3 cm receiver. At the moment a reduction of the observed data is possible only with EFF. In the same way  one must choose CLAS as reduction language for the Online Display under OBS_e.

The procedure workes with two subscans (flagged as ON and OFF) like PSWITCH with a distance of 121 " (i.e. the distance between the two beam positions of the receiver feed). During the observation the dynamic switch 2 switches between the two beam positions. The first subscan is done having beam1 on the source, the second subscan having beam2 on the source. The blanking time has to be greater than  ~125 msec to avoid mechanical problems (for more: see here !). The default values respect all these limitations.

The new verb has the following adverbs and parameters
They are the same like for PSWITCH):

LDSWITCH  <off_long>  <off_lat>  <ref_sys>  <ref_orig>    for the offset position
        /TIME_L   <t_on>   <t_off>                                               for integration time
       /SUBSCAN   <n_repeats>   <f: first on>

The default values for the offset are choosen for the 1,3 cm receiver as:

LDSWITCH   121  0  AZ  ORIG
 
 

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