[evlatests] Software time June 14

[Rick Perley]

    The trouble with Ken's explanation (or to be more precise, that part 
of it which claims it happens with Modcomps in control) is that I don't 
recall ever having seen such a thing in any data, prior to the the 
recent tests of the past week (all with modcomp-free control).  The 
effect is so easily notable (when on a strong source), that I can't 
believe I would have missed it in the hundreds of hours of tests 
conducted over the past couple years ... 
    If a native correlator problem, I claim it started within the past 
week or so.

   

Barry Clark wrote:
> Down to the next level of problems.
>
> Flagging was not working right.  Data remained unflagged while antennas
> were slewing, both for VLA and EVLA antennas.  There were brief intervals
> of flagging in the middle of the slew.
>
> There were two incidents where the data became odd (non-closing, and,
> mostly, down from full correlation.  This lasted about fifteen seconds, 
> and ends with a ten second gap in the data stream, at which time it 
> starts up correctly.  Ken thinks this is some internal glitch in the
> correlator, and that it also occurs with the Modcomps in control, at
> the rate of a few a day.
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