[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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