[evlatests] P-Band situation

[Rob Long]

Brent told me that the FE group did get a P-band receiver installed on 
ant 11.  We don't know if it works or not and I'm sure no levels have 
been set.  I'm headed to the VLA right now so I will look at P-band on 
11 later today.

Rob

Rob Long wrote:
> 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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