[evlatests] More 3-bit data

[Jim Jackson]

In looking thru this one, I see one thing that we need to 
clarify.  EA18 does not have "old" samplers on "new" boards.  It has 
the same samplers and in-house assembled boards we were using before 
but with new firmware and possibly installed in different 
modules.  If these now look the same as the ACDI assembled boards, I 
would say our in house assembly techniques are exonerated.

Cheers,
Jim


At 04:39 PM 11/15/2011, Rick Perley wrote:
>        Michael and Ken ran some more 3-bit tests.  Results are listed below.
>
>Michael Rupen wrote:
> > Hi Rick --
> >
> >   please have a look at:
> >
> > 1- ku_switch_009.55880.84365119213
> >   This is a single-subband experiment, switching back and forth
> > between 3- and
> >   8-bit.  Key question is the stability of the gains (esp. bandpass)
> >   throughout the run.
> >   - The MIB software in the deformatter on ea14 was updated before
> > this run
> >   -- at some point we should try this with all subbands, since the
> > problems
> >     are sometimes confined to a few subbands
>     Result:  No change of spectral shape or visibility amplitudes are
>seen in this switching test, to an accuracy of 1% of so.
> >
> > 2- ku3eq_sameFreqAll_3C345off_001.55880.8811090625
> >   This is a 30-minute run, similar to the long run you've been looking
> > at on
> >   3C84.  We claim that ea23-A is fixed, and ea18 is now working as a
> > 3-bit
> >   antenna (though we saw some oddities in ea18-A2 especially).  Please
> > have
> >   a quick look to check both of these claims.
> >
> >   Note that ea18 uses "old" samplers in new boards.  The state count
> >   histograms are much nicer than they used to be!
> >
>     We have a working 7th 3-bit antenna!  All looks just fine:
>
>     1) ea23A1 is indeed looking like the others now.  It is giving
>proper PSum and PDif now (it wasn't before).
>     2) ea18 shows all the same features (both good and not-so-good) that
>the other antennas show.
>
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