[evlatests] Bad SPW

[Rick Perley]

All four correlations of a single IF.  

Sent from my iPad

> On Jul 1, 2023, at 3:31 PM, Ken Sowinski <ksowinsk at nrao.edu> wrote:
> 
> On Fri, 30 Jun 2023, Rick Perley wrote:
> 
>> And I can confirm the problem (no correlations in SPW44, in Ku-band, for ea17 only, on all polarizations) is still with us.
> 
> Just to be clear, does "all polarizations" means both pols of all If pairs
> or just both pairs of one IF pair?
> 
> Ken
> 
> 
>>> On 6/30/23 12:03, Ken Sowinski wrote:
>>>> On Thu, 29 Jun 2023, Rick Perley via evlatests wrote:
>>> 
>>>> In reducing some data  taken over the past week or so, I note that a
>>>> single spectral window, at Ku, K, and Ka bands, gives only noise -- no
>>>> coherent signal visible in either polarization.
>>>> 
>>>> The SPW is:  #44 in Ku band
>>>> 
>>>> and              #21 in both K and Ka bands.
>>>> 
>>>> The problem is not need in the low frequency bands (L though Ku).  Q-band
>>>> was not observed.
>>>> 
>>>> The problem was in every database taken since june 22.
>>> 
>>> This didn't get as much attention as your complaint about ea27.
>>> 
>>> If, as it appears, this affects all antennas then it sounds like
>>> a bad, or misconfigured, baselineboard.  Other possibilities are
>>> the network switch or CBE, but a bad blb is much more likely.
>>> 
>>> Ken
>>