[evlatests] phase jumps on ea02 B2D2

[Claire Chandler]

Also confirmed at Q-band.

On Fri, 15 Mar 2013, Claire Chandler wrote:

> B2D2 is 3-bit.  Definitely Ka-band, I will check others.  Jerry already tried 
> the jumper cable trick on Feb 21, it didn't fix it.
>
> Claire
>
> On Fri, 15 Mar 2013, Rick Perley wrote:
>
>>     all bands?  some bands?  Only a 3-bit issue? 
>>
>>  Claire Chandler wrote:
>> >   ea02 B2D2 is still showing phase jumps in data from this week.  Does
>> >   anyone know what could be causing this?
>> > 
>> >   Claire
>> > 
>> >   On Wed, 27 Feb 2013, Vivek Dhawan wrote:
>> > 
>> > 
>> > >   Hi Jerry,
>> > > 
>> > >   Phase jumps are still happening, after the cable fix.
>> > > 
>> > >   We are planning a '3-bit sampler therapy session' tomorrow and we 
>> > >   will
>> > >   look at this more - perhaps i have mis-diagnosed it.
>> > > 
>> > > 
>> > >   Jerry Langevin wrote:
>> > > 
>> > > >   A cable was removed from Ant-02 L302-4.
>> > > > 
>> > > >   This should fix the problem.
>> > > > 
>> > > >   Jerry
>> > > >   VLA LOIF
>> > > > 
>> > > >   Vivek Dhawan wrote:
>> > > > 
>> > > > >   Yes,it looks like the jumper cable needs adding/removing from 
>> > > > >   ea02,
>> > > > >   L302-4.
>> > > > > 
>> > > > >   p.s. antena 2 was out yesterday for FRM troubles.
>> > > > > 
>> > > > > 
>> > > > >   Claire Chandler wrote:
>> > > > > 
>> > > > > >   In recent 3-bit data we are seeing phase jumps on scan changes 
>> > > > > >   on
>> > > > > >   ea02, B2D2.  The phase jumps are the same for R and L 
>> > > > > >   polarizations,
>> > > > > >   and seem to have multiple, well-defined, phase states.  Is this 
>> > > > > >   the
>> > > > > >   symptom that is fixed by the jumper cables?
>> > > > > > 
>> > > > > >   Claire
>>>>>>> _______________________________________________
>> > > > > > 
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>> > > 
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>