From dgraham@mpifr-bonn.mpg.de Thu Feb 22 15:32:24 2007
Date: Fri, 23 Feb 2007 01:00:57 +0100
From: david graham <dgraham@mpifr-bonn.mpg.de>
To: "VLBI Observers (Aspen only)" <vlbiobs@nrao.edu>
Subject: Re: EB in bb227b

VLBI Observers (Aspen only) wrote:
> 
> Hi Dave,
> 
> We've been unable to find fringes to EB in the clock searches
> for bb227b. Have tried the usual tricks (+/- 1s, swapping
> polarization & track groups). Might you have any idea what
> could have happened?
> 
> Thanks,
> 
> Lisa Foley
> NRAO Data Analyst
> 
> 
Hi,
well we nearly always mess up those atmosphere blocks at the start of K-band
line experiments.
In this case the operator could not get the communication working to get
source changes,
and stayed on the first source for about the first hour.(you can see because
noise temperature
does not change with elevation). The 4C39.25 scan at the end is definitely
below
local horizon. Best chance is  after 23:00. Sorry I should have mentioned it
before.

Regards, dave