[daip] AIPS question regarding CVEL

[egreisen]

On 2020-10-30 18:11, Rebeca Soria Ruiz wrote:
> Thank you very much for the help.
> 
> I've set aparm(9)2 but the ripples persist.
> 
> By narrow features in the spectra you mean spikes that are not
> suppossed to be in the data? like interferences or similar? but
> wouldn't then the ripples be seen only in those antennas with these
> features? not in all of them?
> 
> To look at the phases you mean the XC spectra of the calibrators?
> 

I assumed I was looking at visibility amplitudes and most plot programs 
can also plot phase of interferometry data.  I have had users who 
observed lines that were only 1-2 channels wide.  CVEL made a terrible 
mess of them.  These ripples, whatever they are, are caused by an FFT 
and shift of some sort of narrow signal either RFI or celestial.

ERic Greisen