[evlatests] VLA Test Results Meeting Today

[Steven Myers]

FYI, here is the "RFI sweep" I mentioned going almost horizon to horizon in 1 hour at constant Declination, elevation was around 10deg at start (unfortunately it terminated early and didnt quite reach that at end).

This test could be repeated at different Decs and probably in a shorter amount of time (20min? 30min?). I should also look at autocorrelations for fun.

-Steve

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On Sep 11, 2014, at 8:25 AM, Rick Perley wrote:

>    All:
> 
>    A reminder of the 10AM meeting, in Rm 317, to discuss recent VLA tests.
> 
>    We have (so far) three items:
> 
>    1) All About 'PDif Compression' -- Rick and Keith.
> 
>                --  what it is, when it happens, how important it is, what causes it, and what we can do about it.
> 
>    2) Changing procedures for correlator operations following a power loss.  -- Kevin and Bob.
> 
>                --  They will explain how it works now, and how Bob recommends how it should be changed to prolong the life of the correlator battery, and what effect such a change would have on observing.
> 
>    3) System gain and polarization stability, and the quest for 'pre-calibrated' data.   -- Rick
> 
>               -- There is much evidence to show that the antenna efficiencies, noise diode powers, bandpass shapes, and antenna cross-polarizations are all very stable over long periods of time. If so, there is no fundamental reason why we cannot 'pre-calibrate' all visibilities (except perhaps for phase).  Doing so will considerably assist our users, particularly in the difficult process of RFI identification and excision.  I'll give a status report on progress towards this goal.
> 
> 
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