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

[Doug Gerrard]

	We verified today at the conduit for the Riser on Ant 14 is not broken.

Doug


Jim Jackson wrote:
> 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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> 
>