[daip] error message in FILLM

[Ken Sowinski]

On Mon, 19 Feb 2007, Claire Chandler wrote:
>
> On Mon, 19 Feb 2007, Eric Greisen wrote:
>
>> Claire Chandler writes:
>> >
>> > I observed this morning and am loading the data via online FILLM.  What 
>> do
>> > the following error messages mean:
>> >
>> > HABANE> FILLM2: *************************************************
>> > HABANE> FILLM2: CHKORR: 20 CORR OF108 DISAGREE ON SCALING OF DATA
>> > HABANE> FILLM2: *************************************************
>> >
>>
>>      This is serious - it means that 5 antennas of 26 had the bit
>> indicating that the data are or are not scaled by system temperature
>> set oppositely from the other 21.  Were there two subarrays during
>> your observing?  (FILLM may not be smart enough to avoid testing
>> multiple subarrays as if they were one???)
>> 
>
> I am not using subarrays.
>
> It is interesting that there were 5 EVLA antennas in my observations,
> although I do not see any evidence that the amplitudes on the EVLA antennas 
> are any different from the VLA antennas.
>
> Claire

I looked into the observing side of this.  The T_sys
correction has not been enable for Q band EVLA antennas,
clearly an oversight.  Thus any Q band data taken has the
"T_sys not applied bit" set for EVLA antennas and reset
for VLA antennas.

A few minutes ago I modified the Q band system file to enable
the T_sys correction for Q band.  I expect that the message
will not appear in tonights data.

I suppose when Eric writes that "this is aerious" he means that
it has consequences for the observer, not that AIPS is unable
to deal with it.  The choice of whether to apply the T_sys
correction  can be an antenna based decision and we should nor
consider that a serious problem.

Ken