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

[Rob Long]

Is the shift the same between EVLA and VLA antennas?

Rob

Ken Sowinski wrote:
> On Sat, 14 Feb 2009, Vivek Dhawan wrote:
> 
>> 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?
> 
> The MIBs still have the correct time when compared with machines
> in the control building and the T5 sync detectors are consistent
> with the antennas, but if there is a difference of an even number
> of WG cycles it will not be seen.
> 
> The L350 is in sync.  Can it have been synchronized to an incorrect
> 1 PPS last Wednesday?  As far as I can tell the system seems to be
> self consistent, but I cannot readily tell if it is correct.
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