[evlatests] VLA baselines. IFA strange.

[Ray Ferraro]

	I noticed the problem with ant 10 return last night. It appears to be 
of an intermittent nature. I had the operator try a few things to no 
avail. Currently the sampler duty cycles look OK. I'm don't know if the 
problem is in the correlator or somewhere else yet. Thanks.

Vivek Dhawan wrote:
> Thanks Ray; perhaps what I am about to say is now moot, but
> here goes:
> 
> It appears the amplitudes on baselines to antenna 10 were high,
> and the phases strange, till things settled down after 12:30 UT.
> Amplitudes on baseline 9-10 were particularly high, and the
> phases zero, before the 'fix' described by Ray Ferraro below.
> 
> In case this was a correlator (or correlator controller) problem,
> I have saved some plots/listings to show Ken when he returns.
> 
> V.
> 
> 
> Ray Ferraro wrote:
> 
>>     There were some strange results coming out of Ant. 10, DCS 15, IFA 
>> early this morning, 10/24/06. The VLA operator swapped the sampler 
>> with a spare around 6 am MDT. This may have fixed the problem. See 
>> work order C119264. However, the symptoms described, SxS = -.779 for 
>> IFA on the baseband overlay, are not typical of a sampler failure. We 
>> will have to keep an eye on it. Thanks.
>>         Ray
>>
>