[daip] Around to talk about a problem with CLCAL

[Doug Roberts]

Hi Eric,

We've been poring over SN and CL before and after CLCAL's.  Doing 
smoothing seems to help find solutions where there were failures.  That 
is a good suggestion, thanks.  However, it looks like the interpolation 
isn't being done in some time ranges over the fast-switch calibrator 
(although it interpolation does work with the less-frequently observed 
bright distant phase calibrator).  I was wondering under what 
circumstances interpolation would not be carried out and if there would 
be anything different between the two types of calibrators.

Thanks,
Doug

Eric Greisen wrote:
> Doug Roberts writes:
>  > Hi Eric,
>  > 
>  > I left you a voicemail message about a problem that Farhad and I are 
>  > having calibrating a dataset using fast-switching mode.  We have an 
>  > observing program where we observed a bright, but distant, calibrator 
>  > every 15 minutes and a weak, but close, calibrator (fast switching) 
>  > every 90 seconds.  We are applying the calibration from both calibrators 
>  > separately (resetting tables etc. between solutions) to make sure the 
>  > results are consistent.  We have an issue applying solutions from the 
>  > bright (infrequently sampled) calibrator in CLCAL and then SPLITTING the 
>  > data gives no additional flags by gain.  However, when we apply the 
>  > solutions from the weak, close, fast-switch calibrator we get about 30% 
>  > flagged by gains.  It looks like something isn't interpolating properly.
>  > 
>  > If you are around to talk or if this rings a bell and you can let us 
>  > know your thoughts by email, I'd appreciate it if you let me know.
>  > 
>
> Try looking at the SN tables before applying them.  The flagged by
> gain comes from failed solutions usually.  Also look at the CL table
> before and after CLCAL to see if some solutions are blanked which will
> cause the deletion.  Note that CLCAL will allow you to replace failed
> solutions (only) with interpolated (smoothed) ones.
>
> Eric Greisen
>   

-- 
Doug Roberts, Ph.D.
Architect for Visualization
Northwestern University Information Technology
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