[evlatests] X-band Holography

[Walter Brisken]

Rick talked about holography:

>   A short 14 x 14 raster at X-band was made for all four EVLA antennas.
>   1) The centering offset problem reportedly lately appears to have been 
> repaired.  All scans seem to peak properly.

Glad to hear this.  I took out the extra 10 seconds (Ken should know 
which -- the first 10 after array.waitModcomp returns).  Now the 
holography and pointing modes do the same thing, however are at odds with 
my understanding of the timing of array.waitModcomp relative to the 
modcomp scans.  I'd be happy to say that "it works" and not worry about 
the details if everyone else is.

The two 7x7 L-band holog runs I took earlier today (in proj TBRISK) showed 
no phase jumps.  The first was the normal 10 seconds duration per 
pointing; the second run had 20 seconds duration per pointing. 
Given this I should have encountered a phase glitch if they occurred at 
the rate Rick suggested earlier.  Maybe something was fixed?  Maybe the 
clocks were in tune?  I'd be a bit skeptical about blaming L301 at the 
moment...

-W