[evlatests] Antenna 14
Terry Cotter
tcotter at nrao.edu
Thu Sep 20 15:09:47 EDT 2007
Rob just informed me that the L301 was bad in 14 and we do not know
where the spare rev B is. He is going to pull it and bring it back for
repair today. This antenna will be partly down overnight.
Rick Perley wrote:
> First -- the good news. There is no sign of the 'wandering phase'
> that EVLA antenna 14 used to show.
>
> But, from last night's test, I find that IFs B and D gave no
> fringes, at P and L bands only. At all other bands, all four IFs
> behaved relatively well.
>
> There is a regular amplitude modulation on IF 'A' -- typically a few
> percent in ampliutude and a few tens of seconds in period, seen at L, C
> and (weakly) at Xband. No correlation with reported Tsys is seen.
>
>
>
>
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