[Difx-users] difx2fits bug for a mixed pcal setup

[Walter Brisken]

Hi Leonid,

In this case, did you try the

-u

option to difx2fits?  That is the intended way to merge setups.  I'd be 
interested to know if that option would have worked for you.

Thanks,

Walter

-------------------------
Walter Brisken
NRAO
Deputy Assistant Director for VLBA Development
(575)-835-7133 (office)
(505)-234-5912 (cell)

On Fri, 18 Sep 2020, Leonid Petrov via Difx-users wrote:

> Dear colleagues,
>
>  I found a bug in difx2fits. Difx2fits silently did not put
> autocorrelations in FITS-IDI for one of the stations.
>
>  A small dataset is located at http://astrogeo.org/s0/corr_difx/vo0051_bug
>
>  Depending on whether an affected station (in this case YJ) participate
> in the 1st scan in the list or not, results for the 2nd scan are different
>
> difx2fits --override-version -v --localdir --antpol --polxy2hv --difx-pcal-interval 10 \
>   h_1068.input \
>   h_1069.input \
> /tmp/vo0051_01a.fits  # correct
>
>
> difx2fits --override-version -v --localdir --antpol --polxy2hv --difx-pcal-interval 10 \
>   h_1049.input \
>   h_1069.input \
> /tmp/vo0051_01b.fits # incorrect: autocorrelation of YJ is missing: records with autocorrelation are silently skipped.
>
> My analysis showed that station YJ uses pcal with spacing 10MHz, while
> other stations use pcal spacing 5MHz. toneSelection = all was not used
> in v2d. Therefore, *input file command to extract two tones per IF.
> When configs are merged, IFs of YJ and IFs of other stations are considered
> different. If YJ participated in the first scan in the list, nothing wrong
> happens. If YJ did not participate in the first scan, difx2fits considers
> these IF are new... but then something wrong happens. It creates an additional
> config, but does not assign freqID correctly. Records without a correct freqID
> are skipped.
>
>  I failed to fix this bug, although I found a way to circumvent it. See the next
> post. I added printing statistics of skipped records.
>
> Leonid
> 2020.09.18_22:44:14
>
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