[evlatests] Update on Positions; Phase stability; RTP on EA14.

[Jim Jackson]

Has anyone visually checked the elevation fiber wrap on Antenna 14?  If the 
conduit broke the same way antenna 23 did, it could be causing different 
behavior in the RTP measurement.

Jim


At 09:13 AM 1/22/2007, Doug Gerrard wrote:

>         No work has been done to the fiber in the last several months, other
>than normal moves and/or any module swap outs.
>
>Doug
>
>Vivek Dhawan wrote:
> > 1. EA 14, 16, and 24 moved last week. Two baseline runs were
> >     done on Saturday, and positions could be found for all EVLA
> >     antennas including 17.
> >
> > 2. Residual phase changes with elevation are +_1 radian on
> >     the older antennas 13,14,16, and even less on the newer
> >     23, 24, 26, 17. (All at X band)
> >
> > 3. L352 round-trip meters appear to exist at 13,14,18 and two
> >     more unidentified antennas.
> >
> >     mib-1-22 was working, but I  dont know on which antenna.
> >     mib-0-52 was logging at once/min instead of once/10s, and
> >              its reading was unchanging.
> >
> >     The meter on EA14 now changes its response by 5 ps as the
> >     elevation changes on that antenna, and seems to know when
> >     the antenna goes over the top (EL >90). It is the only meter
> >     doing this, it is a new phenomenon, and I noticed it first on
> >     January 10th, i.e. it started before EA14 was moved.
> >     From the monitor data archive, it was present Dec 6th. (I do
> >     not have this monitor point in Oct-Nov). Was the fiber on
> >     EA 14 'fixed' in some way before Dec 6th?
> >     I don't know if the meter is telling the truth, but it seems
> >     to show the diurnal temperature trend correctly.
> >
> > Vivek.
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