[daip] SPCAL question and problem

[Hanno Spreeuw]

Thank you,

So the D-terms from SPCAL are not truly channel dependent. I guess that 
if this is required one would have to chop up the dataset, run LPCAL 
and/or other polarization calibration routines on each of the single 
channel datasets, apply the corrections and run DBCON to return to one 
dataset.
Is that correct?

Cheers,
Hanno.

Eric Greisen schreef:
> Hanno Spreeuw wrote:
>> Hello,
>>
>> I have a question about SPCAL and a small problem. How are the 
>> frequency dependent D-terms computed? Are the solutions expressed as 
>> coefficients of a polynomial?
>> LPCAL seems to export more numbers to the AN table than SPCAL does.
>
> Despite what SPCAL says in the help file, it sums channels BCHAN to 
> ECHAN into the fitting arrays - so each RR/LL/RL/LR set is handled 
> separately by channel but the fit is then for some average.  There is 
> no place in the AN table for more than 2 
> parameters/IF/polarization/antenna.
>
> Eric Greisen