[evlatests] Calibrating 3-bit data

[Rick Perley]

    Vivek's statement arises from the AIPS calibration corrections 
('CALIB'), on data which have been corrected by the switched power 
tables.  He and I have always noted that these correction factors are 
within a few percent of 1.0, where 'a few' is typically 5%.  (There are 
usually a few antennas which are quite deviant -- usually due to 
problems in the SY tables). 
    It's certainly true that the high frequencies are worse, but that's 
easy to explain in terms of extraordinary atmospheric absorption, bad 
pointing, winds, etc. 

    If you have trouble accepting these statements, I have some 'flux 
density' data you can try this out yourself ...

    Rick

Bryan Butler wrote:
> i've never seen a definitive, and *repeated*, demonstration of this. 
> i'd guess it's more like 10% at best, on average (you might get lucky 
> and get better on occasion).  at least at K-band and above.  it might be 
> slightly better at the lower bands.  maybe you have data that shows it, 
> but i'd like to see it.
>
> 	-bryan
>
>
> Vivek Dhawan wrote, On 1/29/12 17:34 PM:
>   
>> The 8-bit data have been shown to calibrate to
>> a few %, compared to the classic method with 3C286 etc.
>>     
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