[mmaimcal] Re: ALMA requirements

[John Conway]

>
> >There was also some disussion about one year ago about the level of
> >Azimuth induced phase errors due to cable wrap (another critical area
> >for antenna position determination), a goal was determined and ICD
> >written. Has this  goal been achieved, what is the expected level of Az
> >induced delay errors and what are the  implications for antenna position
> >determination? Maybe it is time again to look again at the position
> >calibration issue.  Unfortunatley I am no longer funded to work on
> >ALMA - so I guess someone else has to be assigned to look at this
> >problem.
> >
> >
> Can you send me the draft-ICD and other background material?  Thanks.
>
> -- Jeff
>

Hi,

 Here is the last email I have on the topic, with a link to the ALMA
document and discussion thread. I include the actual CRE draft as an
attachment, it seems that
although the spec on 180deg slews is as we agreed, it is still incomplete
on  the subject of small angle slews, with the specified  angle left
over which the spec applies still written as *** deg ...


  John



--------------------------------------------------------------


>From jconway at oso.chalmers.se Wed Jan  4 14:25:05 2006
Date: Tue, 5 Apr 2005 15:22:42 +0200 (CEST)
From: John Conway <jconway at oso.chalmers.se>
To: Bill Shillue <bshillue at nrao.edu>
Cc: Dick Sramek <dsramek at aoc.nrao.edu>, Al Wootten <awootten at nrao.edu>,
     jpayne e <jpayne at orval.tuc.nrao.edu>, Darrel Emerson <demerson at nrao.edu>,
     cjanes <cjanes at nrao.edu>, Mark Holdaway <mholdawa at nrao.edu>
Subject: Re: Baseline Calibration/LO Delay stability


Hi,

 OK on checking my old emails I see that a CRE was submitted to ALMA EDM
at

http://almaedm.tuc.nrao.edu/forums/alma/dispatch.cgi/changereq/docProfile/100416/1651203

and contains the simple spec on 180 deg delay stability we agreed in
November. The part of the spec on intermediate angle slews (not
so relevant for baseline cal) still seems  incomplete to me.

It was submitted on 5th Jan 2005, but is in 'IPT Review', so its in the
state of most ALMA documents, in administrative limbo;  at least there
is a document in the system, it would be though to move through to
approval.

   John
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 2005-01-05ALMA-50.00.00.00-090-A-CRE.doc
Type: application/msword
Size: 61952 bytes
Desc: 
URL: <http://listmgr.nrao.edu/pipermail/mmaimcal/attachments/20060104/3f68c2fe/attachment.doc>