The ATCA Forum

I've been looking at calibrating some observations from mid-2011, and the first thing that I did was to split out the 1934 observation and plot the XX and YY product amplitudes as a function of time. It was immediately obvious that there is significantly more scatter in the ant 3 baselines for the Y...

Hi Mark - just a quick question about using the fwhm parameter in INVERT which follows on from Sara's post and your reply. From the documentation it seems a little unclear what specifying a value for fwhm actually does. The help file says: "It specifies the FWHM of an image-domain gaussian -- t...

I already said it in an email, but I thought I'd acknowledge it here too - great stuff Emil! Thanks for taking the time to look into this for me! For the moment it is just good to have an idea what is going on, and that it is to some extent unavoidable using the simplest approach to getting a bandpa...

Great - thanks a lot Mark!

Hi guys, Quick question about the nfbin parameter: how exactly does the 2100MHz CABB band get divided when using nfbin? Say I set nfbin = 16. Does this mean that the band will be divided up into 16 bins, with 2100MHz (being the middle of the band) sitting precisely on the dividing line between the 8...

Thanks very much for your reply Mark. A couple of people I have talked to since posting this have raised the possibility of additional sources in the field being the cause. For example, Emil Lenc said that he did some high dynamic range imaging of the 1934 region a few years back and found some exte...

Hi Rowan - Craig Anderson here. Just thought I'd give you my two cents because I have been working with 16cm data, calibrating it in much the same way. I have found that the issue you mention occurs whenever GPCAL does not converge on a calibration solution within about 5 iterations or so for the su...

Thanks for the help Jamie, and thanks for looking into the 'wobbles' issue for me! I owe you multiple beers next time I'm up...

Also - I want to combine UV data from two different epochs (that has been separately calibrated) for imaging. UVCAT is the correct task for this purpose, is it not?

Thanks Jamie - much appreciated. You said that "In terms of calibration, I have not personally seen a single instance where calibration of individual chunks has been more effective than calibration of the entire bandwidth at once". Just to clarify - you mean that you've never seen an insta...