[evlatests] Good News, Bad News ...

[Data Analysts]

We received an email from Dominik Riechers describing a a problem with 
loss of 50% of their data on 11B-238_sb6661969_2. I have not had time to 
look at it yet. I will forward that email.
Paul Dyer

Rick Perley wrote:
>     I reported yesterday on an array of failures which afflicted a test 
> from the previous night. 
>     I re-ran that file last night, but put in a 'wrap' card to prevent 
> the long azimuth slew. 
>
>     First, the Good News:
>
>     1) There were no missing BDF files, and all requested scans provided 
> data. 
>     2) All requests for referenced pointing were honored, and solutions 
> for most antennas were obtained for each requested observation.  I write 
> 'most' antennas, because ...
>
>     But not all is good, as:
>
>     The failures modes described yesterday -- wherein the majority of 
> the scans have ~50% of the data blanked out (pure zeros) -- afflicted 
> the test last night as well.  The two modes (essentially, antennas are 
> blanked out in pairs, with mode 'A' being antenna 1 and 2, 5 and 6, 9 
> and 10, etc., and mode 'B' being the opposite (antennas 3 and 4, 7 and 
> 8, etc.) are still present, and afflicting nearly all the scans and all 
> the bands. 
>
>     Something is seriously amiss with the correlator.  Do we know that 
> this problem is not affecting the science data? 
>     My setup is completely vanillla -- eight subbands of 128 MHz each 
> (except at L-band where it is 64 MHz) for each of the two IF pairs.  
> This configuration has been run successfully an almost countless number 
> of times. 
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