[evlatests] Broken switched power

[Emmanuel Momjian]

The stress test was run this morning, and inline below I give 
comments/updates:


On 03/22/2017 11:42 AM, Rick Perley wrote:
>     A short calibration run was made early Tuesday morning.
>
>     Some antennas/bands have non-functional switched power.  The list 
> is short:
>
>     1) At Ku-band, ea11D has all negative PDif.  The other IFs are 
> fine.  The PSum value shows that this IF has a value about 100 times 
> larger than it should be!  Other IFs are fine.


This is OK as of this morning.


>     2) At Ka-band, ea10, both C and D (i.e., left polarization) are 
> 'wild and crazy' values of PDif.  The PSum values are also completely 
> wild.


also OK now in both PSum and PDif.


>
>     3) At Ka-band, ea27C has zero (noise only) values of PDif. Other 
> IFs are fine.  The digital power PSum for all four IFs are normal.  
> (This antenna/IF has been like this for quite some time ...)


Both IFs C and D in ea27 are showing very low PDif values (at least on 
order of magnitude lower compared to other IF's or antennas). PSum's are OK.


>
>     Overall, the usual characteristics for the high frequency bands 
> are seen -- high variability in PDif (and gain) -- tens of percent,  
> over timescales of seconds to minutes due to my changing bands 
> continuously.  The low frequency bands (L through X) do not show this 
> characteristic.
>
>
>
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