[evlatests] ea2, ea1, and ea 21
Rob Long
rlong at nrao.edu
Mon Dec 8 16:44:27 EST 2008
Does anyone know what time these stress tests were run? I'm finding
some strange (antenna) data in the archive, but I need to know what time
I'm specifically looking for.
Thanks,
Rob
Rick Perley wrote:
> Recent test show that EVLA antenna #2, on the B and D IFs only, is
> showing very short timescale (< 1 second) high amplitude (~50%)
> fluctuations at all bands. A DTS problem?
>
> Antenna 1, on IF A primarily, shows two stable amplitude states,
> separated by about 2%. The typical duration in each is a few seconds.
> There is no phase effect.
>
> Antenna 21 shows a similar effect, except that: the 'jump' can be
> either higher or lower, the 'jump' lasts only one integration period
> (1.67 seconds), and all four IFs have identical and simultaneous 'jumps'.
>
> I have plots for all of these.
>
> Rick
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