[evlatests] ea24 problem

[Rob Long]

If it were truly an L301 problem, wouldn't Ka band be the worst due to 
the tripler? Also, what did switched power look like? Was there any 
effects seen in Tsys?

Rob

Emmanuel Momjian wrote:
> Yesterday, test observations at Ku-band showed noisy phases and 
> amplitudes on ea24. To look into this in more detail, today we ran 
> multi-frequency observations spanning all the bands from X to Q using 
> the calibrator J2202+4216 .
> 
> While there is nothing obvious at X-band, the data show that the phases 
> and the amplitudes degrade progressively from Ku to Q band.
> 
> Pointing looks OK on ea24. Therefore we think that the problem may be in 
> the L301 or its reference signal, although L302 and the round trip phase 
> look good.
> 
> For reference, attached are a couple of Q-band plots for three baselines 
> (with one of these being a baseline to ea24). The file 
> 'ea24_L301_problem.png' shows the visibility amplitudes, and the file 
> 'ea24_phases_L301_problem' shows the visibility phases. The blue and the 
> red lines are for RR and LL, respectively. As it can be seen, both 
> phases and amplitudes to ea24 look very noisy.
> 
> Emmanuel (and Vivek and Ken)
> 
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