[evla-sw-discuss] Amplitudes greater than 1 in TelCal

[Barry G. Clark]

It's probably interference.  A single channel can go up to
nchan times the normalization for lags.


> well, a correlated power is still a correlation, but i get the point.
> i
> just misunderstood the normalization (or lack thereof).
>
> 	-bryan
>
>
> Ken Sowinski wrote, On 11/1/11 15:42 PM:
>> On Tue, 1 Nov 2011, Bryan Butler wrote:
>>
>>>
>>> it's still a correlation, and it's not scaled (or at least i
>>> *think*
>>> it's not scaled), so should always be <= 1.0.
>>
>> As MIchael said, it is not a correlation but a "correlated power".
>> Autocorrelation come out to be about 2.7**2 if everything is set
>> right.
>>
>> Example: 3c273 has about 0.1 correlation at many bands and the
>> fringe
>> disaply provedes numbers between 0.5 and 0.8 for most antennas.
>>
>> The number would more resemble a correlation coefficient if devided
>> the the requeanter RMS sqaured.
>>
>> Ken
>>
>>
>>> Michael Rupen wrote, On 11/1/11 15:29 PM:
>>>> But this is NOT a raw correlation coefficient -- why should it be
>>>> <=1 ?
>>>>
>>>> Michael
>>>>
>>>>>
>>>>> it should never be > 1.0, since it is a correlation.
>>>>>
>>>>> -bryan
>>>>>
>>>>>
>>>>> Keith Cummings wrote, On 11/1/11 15:02 PM:
>>>>>> Michael caused problems today by running
>>>>>> Lsysstart.55866.792821435185
>>>>>> which produced amplitudes greater than 1. TelCal's Antsol
>>>>>> routine does
>>>>>> not approve of amplitudes (actually amplitudes squared) greater
>>>>>> than 1
>>>>>> or less than 1e-20. If five integrations within a
>>>>>> baseline-baseband-polarization-subband are out-of-range, antsol
>>>>>> marks
>>>>>> this data as flagged for both antennas in this baseline
>>>>>> (antenna-baseband-polarization).
>>>>>>
>>>>>> The low side (less than 1e-20) is probably fine. Michael is
>>>>>> suggesting
>>>>>> that the high side restriction (greater than 1) might need to be
>>>>>> removed.
>>>>>>
>>>>>> Thoughts?
>>>>>>
>>>>>> -Keith
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