[daip] AG776: Question about error messages in FILLM

[Ciriaco Goddi]

Hello Eric,

I checked the TY and I actually found out that whereas all other
frequencies had values of sensitivity ~0.5-1 K, the IF2 shows much higher
values, from ~3K in some antennas and polarization to completely crazy
values in some others (GK!). So, the problem is not (only) that of antenna
8 . Do you think that the online system flagged all data from IF2, based
on the wrong Tsys values?

Best,
Ciriaco

----------------------------------------------------------------------------
Ciriaco Goddi
Postdoc Fellow
Harvard-Smithsonian Center for Astrophysics
Radio and Geoastronomy Division
60 Garden St.  MS 42, Cambridge, MA 02138
http://cfa-www.harvard.edu/
Ph:  617-496-7636, Fax: 617-495-7345

On Mon, 3 Mar 2008, Eric Greisen wrote:

> Ciriaco Goddi writes:
>
>  > FILLM1 16:55:05 MCWAIT: Factor error; C(  2)= 0.107E+00 * C(  8)=
>  > 0.138E-09
>  > FILLM1 16:55:05 MCWAIT: IF    =  2, FREQ    =  1, IS     =  3, STRM=  1
>  > FILLM1 16:55:05 MCWAIT: IF inc=   12, FREQ inc= 24, POL inc=  3
>  > FILLM1 16:55:05 MCWAIT: Factor error; C(  2)= 0.355E+00 * C(  8)=
>  > 0.138E-09
>  > FILLM1 16:55:05 MCWAIT: IF    =  2, FREQ    =  1, IS     =  3, STRM=  1
>  > FILLM1 16:55:05 MCWAIT: IF inc=   12, FREQ inc= 24, POL inc=  3
>  > FILLM1 16:55:05 MCWAIT: Factor error; C(  4)= 0.628E+00 * C(  8)=
>  > 0.138E-09
>  > FILLM1 16:55:05 MCWAIT: IF    =  2, FREQ    =  1, IS     =  2, STRM=  1
>  > FILLM1 16:55:05 MCWAIT: IF inc=   12, FREQ inc= 24, POL inc=  3
>  > FILLM1 16:55:05 MCWAIT: Factor error; C(  4)= 0.177E-01 * C(  8)=
>  > 0.138E-09
>  > FILLM1 16:55:05 MCWAIT: IF    =  2, FREQ    =  1, IS     =  2, STRM=  1
>  > FILLM1 16:55:05 MCWAIT: IF inc=   12, FREQ inc= 24, POL inc=  3
>
> This message is saying that the recorded nominal sensitivity number,
> proportional to system temperature, is in fact very large so that the
> scaling for antenna 8 is very small.  Those data will be flagged (as
> they probably should be).  This should not delete all of IF 2, just
> antenna 8.  You can examine the TY table to see what is recorded
> there.  The "TSYS" column is for the VLA the nominal sensitivity.
>
> Eric Greisen
>