[evlatests] Time error of 10 WG cycle on array?

[Vivek Dhawan]

That should be 0.5 sec or ~10 WG cycles. Duh.

Vivek Dhawan wrote:
> Baselines were done after the 5 N arm antennas moved, and
> show 2 curious things.
> 
> 1. There appears to be a systematic position shift of
>     every antenna, increasing along each arm, with a
>     maximum of 25cm at the ends. Since the velocity at
>     at the end of an arm in B array is 50cm/s, this
>     corresponds to a time error of about 0.05s, or 1
>     waveguide cycle. Could the timing have gone off in
>     the recent network changes?
> 
>     I do not know when it started, it may be apparent in
>     data from last week but that's a job for another day,
>     I want to send this message out now.
> 
> 2. There are small (5mm max error) but unexplained changes
>     in the positions that the online system is using for the
>     antennas that did _not_ move last week. The database shows
>     no change for these antennas since Jan 21, when the last
>     baseline update went in. Perhaps this mystery is related
>     to the timing error but does not appear to be systematic,
>     so i'll ignore it till (1) is fixed.
> 
> Vivek.
> 
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