[evlatests] Temperature-Dependent Gains at P-band...

[Dan Mertely]

Hi Rick.  I notice that all 4 antennas referenced are on the
west arm.  -Mert

On 2/14/2019 9:07 AM, Rick Perley wrote:
>      In reviewing the data from the lunar polarization experiment, I 
> note that some antennas have a very strong temporal variation in their 
> gains.  These changes are as large at 75%, are quite slow, and seem 
> highly correlated with temperature -- for all the affected antennas, the 
> maximum gain occurred at ~6AM, when temperatures were coldest.
> 
>      The most strongly affected antennas are:
> 
>      ea02 (max/min power ratio = 1.75)
> 
>      ea01 (1.50)
> 
>      ea24 (1.40)
> 
>      ea28 (2.0 -- although the time dependency for this one is not the 
> same as the others).
> 
>      For all, the rise and fall of the power is gradual.  And for all, 
> the switched power values seem to perfectly track the gain changes (as 
> they should!).
> 
>      Why should these antennas be (apparently) temperature sensitive, 
> while the others are not?
> 
>      Rick
> 
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