[evlatests] Two Remarkable Characteristics

[Bruce Rowen]

On Aug 25, 2011, at 5:01 PM, Rick Perley wrote:
> .
>
>    1) Good
>
>    We are all familiar with the 'subband 0' rolloff, of still
> mysterious origin (although I understand there's a good chance this
> originates in the station board?)
>    In determining the bandpass, I reviewed the bandpass solutions.   
> The
> 'rolloff' is completely absent in two antennas -- ea19 and ea21, on IF
> 'B' only!  Subband '0', on those two antennas on that IF is  
> beautifully
> sharp and flat, except for the sharp drop due to the anti-aliasing  
> filter.
>    A number of other antennas show a dramatically smaller 'rolloff' on
> various IFs -- but none are flat like ea19 and ea21 on IF 'B'.  This
> bandpass was identical on all three runs.
>    Keith has been informed, and reviewed the T304 data for those
> antennas -- nothing unusual.  It's gotta have something to do with the
> station board.  (Can we make all the others like these two?)
>


All station board filter look-up-tables are loaded from a common  
directory. Unless the sub band configurations for that antenna are  
different from others, they all should use identical tables.

-Bruce