[evlatests] EA01, C band, IF A shows periodic amplitude drops

[Ray Ferraro]

	Yes, it appears that a VLA sampler is causing this problem. This will 
be addressed next maintenance day. I had a problem this maintenance day 
with the AC side delay/mult racks shutting down following some 
underfloor activity to accommodate some network re-cabling and would 
prefer not having these racks shaken or doors opened until then.
		Ray Ferraro

Michael Rupen wrote:
> Two test runs yesterday morning (Thursday 11jun09) at C band showed
> odd amplitude behavior for antenna ea01, IF A: periodic amplitude drops,
> with a drop of a few per cent lasting for ~30 seconds every two minutes.
> 
> The first run was a spectral line observation (25 MHz per IF, mode 4
> --> 7 channels per IF after dropping the first channel); the second was
> the standard continuum setup (50 MHz per IF).
> 
> Ken tells me he suspects the sampler.
> 
>           -- Michael
> 
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-- 
Ray Ferraro
National Radio Astronomy Observatory
Array Operations Center
P.O. Box O
1003 Lopezville Road
Socorro, NM 87801-0387
575-835-7196
fax: 575-835-7027