[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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