[evlatests] A most curious end-of-scan problem ...

[Rick Perley]

    Wow -- although Ken assures me this has always been the case, I (and 
I think Vivek) have been unaware of this.
    Presuming it will be some time (more than a few days) before this 
feature is removed, I suggest the appropriate web pages include this 
problem -- which affects observations both to and from Xband, and one 
half of Ka-band (I don't recall which half ...)

    Rick

Ken Sowinski wrote:
> On Sun, 31 Oct 2010, Rick Perley wrote:
>
>>    For C and X bands *only*, the final 17 integrations (17 seconds) for
>> each source were completely noise on all antennas and both frequencies
>> within each of these bands.  No such effect was seen at L or S bands.
>> The duration of the 'dead' data was exactly, and only, 17 seconds.
>
> Somewhere along the way instructions to the correlator
> to change net sideband are executed in anticipation
> of the event.  We are planning to do this differently
> in the near future and if that does not fix the problem
> it will be debugged then.  Meanwhile, observations which
> change net sideband should make the preceeding scan a
> little longer than otherwise needed.
>