[daip] error message in FILLM

[Claire Chandler]

So the question is, did FILLM apply the Tsys corrections to the data from 
the EVLA antennas when it loaded them?  It seems not, since the weights on 
all the EVLA-EVLA baselines are constant.

But in principle since FILLM can detect whether the Tsys corrections have 
been applied in an antenna-based way, it could do these corrections.  Can 
I request that this be fixed in FILLM so that I can calibrate my data from 
last night correctly?

Claire

On Mon, 19 Feb 2007, Ken Sowinski wrote:

> 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
>