The software ASTRO can be used to simulate these OBS commands. Astronomers are urged to download the most recent version of GILDAS at
http://www.iram.fr/IRAMFR/GILDAS../IRAMFR/GILDAS to prepare their proposals.
ASTRO\LINE name frequency band
where
The setup of the spectral units and the IF processor for the narrow-band correlator is selected by the two commands
ASTRO\NARROW Qi Qj /RECEIVER Band_Number ASTRO\SPECTRAL iunit bandwidth fcent /NARROW Narrow_input - [/BAND Mode] - /RECEIVER Band_Number
where
A session to design the above correlator setup could be:
LINE HCOP-HCN 87.00 LSB 6500 ! Define the receiver tuning. ASTRO displays ! the full 3.6 GHz frequency coverage by WideX. NARROW Q1 Q3 ! Selects the 4.2GHz - 5.2GHz and 6GHz - 7GHz windows ! of the 4-8GHz IF1 band. Polarization is HOR HOR. SPECTRAL 1 160 1020 /NARROW 1 ! Correlator unit #1 covers the [940,1100] IF3 band ! on the first IF input (4.2GHz - 5.2GHz). SPECTRAL 2 20 210 /NARROW 1 ! Correlator unit #2 samples a narrow line centered at ! 210MHz in the IF3 band of the first correlator input. SPECTRAL 3 20 770 /NARROW 1 SPECTRAL 4 160 350 /NARROW 1 SPECTRAL 5 160 475 /NARROW 1 SPECTRAL 6 40 750 /NARROW 2 ! Correlator unit #6 covers the [730,770] IF3 band on ! the second IF input (6GHz - 7GHz). SPECTRAL 7 320 400 /NARROW 2 SPECTRAL 8 320 925 /NARROW 2
Fig. displays this example of frequency coverage.
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