Frontend operations¶
General rules¶
To change the frontend Local Oscillator frequency, use the following command:
> setLO=[freq1];[freq2];…;[freqN]
Notice the semicolon. Ideally, different values could be assigned to different IFs, thus tuning each section to a different sub-band. For the present hardware, though, this is not possible, so a single value must be specified:
e.g.> setLO=22000
Remember that the actually observed band begins at a frequency which is usually different from the LO one (see Initial setup)
The temperature of the calibration mark in use is recorded in the logfile whenever a Tsys is measured. It is also stored in the FITS output files. The calibration mark can be manually switched on and off respectively with:
> calOn
> calOff
If the user wants to perform the setup for the frontend only (without affecting the mount, the minor servo or the backend), the command is:
> receiversSetup=[code] (CCC, CCL, CHC, CHCL, XXP, KKC)