[evlatests] Ant 11

[Ken Sowinski]

On Mon, 8 Oct 2007, Rob Long wrote:

> Ant 11 has a working C-band, but needs to have it's attenuator levels
> set properly for the B/D LUT.

This has been done.  But, see below.

On Mon, 8 Oct 2007, Ken Sowinski wrote:
> 
> Date: Mon, 8 Oct 2007 14:44:03 -0600 (MDT)
> From: Ken Sowinski <ksowinsk at aoc.nrao.edu>
> To: Robert Long <rlong at nrao.edu>, Phillip D. Hicks <phicks at nrao.edu>
> Cc: ms-evla-online-soft at nrao.edu
> Subject: Re: C121426, ANTENNA LO PROBLEMS
> 
> On Mon, 8 Oct 2007, Phillip D. Hicks wrote:
> 
> >   Work Order		:  C121426
> > 
> > * WO Status		:  OPD
> >   Asset Number		:  ANTENNA LO PROBLEMS
> >   Asset Short Desc	:  Tag for EVLA LO/IF problems
> >   Asset Location		:  VLA-ANTENNA 01-VR
> >   Originator		:  Gardiner, Matt
> > * Asset Status		:  ISF
> >   Safety			:  N
> >   Plan Priority		:  3
> >   Origination Date	:  10/5/2007
> >   Due Date			:  10/5/2007
> >   Fault Code		:  FAILURE
> > 
> >   Work Requested		:  Ant. 11 IFs B&D fringing very weakly,
> > close to 0, at C band.  Sampler RMS is high, approx. 50, and Sync
> > Detects are low, approx 0.1.  Occurred during 099AH884, C band, line 4,
> > sky freq 4.8226 GHz.
> > 9/8/07 - Hardware OK. Needs attenuator levels sets!!!
> 
> Attenuators were set for 24 BD at C band.
> Rob,  IF D is suspicious.  When I set it for the standard
> -20 and -30 dBm there was not enough power at the T5 for the
> ALC to level.  The sampler RMS and FIR gain both look normal.
> I set the attenuator to provide -27 dBm at the output meter
> but don't believe that everything is right yet.
> 
> Ken
>