[evlatests] Sudden Delay Change

[Ken Sowinski]

On Wed, 23 May 2012, Rick Perley wrote:

>    A holography test was run this morning, at 6cm.  Data in general
> look very good.  But ... ea02 had a large and sudden delay change, on
> all four IFs, of nearly 100 nsec (the change was different in each IF).
> The time for this was between 13:15:21 and 13:18:55, IAT.  The
> amplitudes appear to have remained the same.  The new, large, delays
> were not stable on the RCP side, with both A and B showing two different
> values, appearing on individual scans.

Even yesterday ea02 was still a bit unstable after its move.
There is some folklore that suggests that unstable delays
last for a day or two in some cases after an antenna is moved
or seriously perturbed.