[evlatests] P-Band situation

[Rob Long]

Antennas 11, 13, and 16 will NOT fringe at P-band because they do not 
have T302s that allow switching to P-band.  Ant 14 has an old T301 with 
large 1024 MHz spurs from the LO.  All other (EVLA) antennas should be 
working at P-band.

Rob

Rick Perley wrote:
>     I'm confused as to the state of the P-band system.   Perhaps 
> somebody can clarify what is on the antennas, and what isn't...
> 
>     I ran a short observation yesterday afternoon, to see what worked, 
> and what didn't. 
> 
>     1) All data from 11, 13, and 16 are flagged out.  But when I fill 
> the data with the flags ignored, I see stable (but usually weak) fringes 
> on most of the IFs from these antennas.  Looking at EVLA Antennas 
> Modifications/Retrofits sheet, I note that receivers are claimed to be 
> in all three antennas -- but boldfaced for all three.  What does this 
> mean?   Which of these antennas should (or could) give fringes, and 
> which should not? 
> 
>     2) Antenna 4, IFs A and B are very erratic and weak.  A is not 
> flagged, but B is.    IFs C and D are fine. 
> 
>     3) Antenna 26, IFs B and D (IF#2) gives no fringes, but is not 
> flagged.   IFs A and C are fine. 
> 
>     4) Antenna 17, IFs B and D, gives good fringes, but is flagged.    
> IFs A and C are fine. 
> 
>     5) Antenna 21, all IFs, has large, semi-square wave, amplitude 
> pulsations of very large amplitude.  The phases seem not to be affected 
> by this.  I recall noting this same effect some weeks ago... 
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