[evlatests] 2010-06-29 23:38 TRSR0001

[Vivek Dhawan]

Overall - plenty of data good in both OSRO and RSRO modes. No data at all
for the last ~12minutes, (no SDM binary) so I am tentatively ascribing this
to the CBE disk problem unless someone knows better.

Here are some details. I believe there were no new problems.

Antenna flags, pure zeros: OSRO: 9% , 11%. RSRO: 0% , 9%. i.e, this means
that time lost to reconfig OSRO --> RSRO same as before, upto 30sec.
RSRO --> OSRO looked a bit better, but the % data lost was the same.

No whole scans were missing, other than the end. Individual subbands
_were_ missing for the whole time, (see bandpass comments below).

No incoherent data.

Misc oddities: ea04, 10, 14, 18 showed one or more phase jumps.

BD in OSRO mode showed much more data loss in short bits (even after the
reconfiguration was complete). B,D gaps were simultaneous. AC showed no
such problem. This is an old problem which may have morphed slightly.
Let me know if details are of any use.

Bandpass/Frequency labels:

Correct and as expected, AC 1GHz 8 subbands centered at 5.052 to 5.948.
BD 8sb at 7.052 to 7.948.

OSRO: 17BD no data but for two 1-sec records! AC fine.

RSRO: ea01 IF D subband 5 (=1D5) no data for any time. so also 13C1,
       17C5D5, 26D4. I'm guessing these are 'permanent' chip-level flaws,
       not a dynamic problem in reconfiguration.

       EA14, 16, 17 and 25 had similar-looking bad bandshapes over 2GHz,
       I checked the receiver sheet and can explain 14, 16, 25 as non-
       EVLA compliant receivers (old OMT) but the 4th one should be on
       ea04, not ea17 unless they got swapped. Anyway, not a correlator
       problem I bet.


Michael Rupen wrote:
> Hi Vivek,
> 
>   would you have a look at this one?  It's a short file switching between
> OSRO and RSRO modes at C band -- I can send you the OPT listing in
> the morning if you like.  Basic questions are the usual:
> 
> 1- Data quality
>   : pure zeroes 
>   : lost scans
>   : amp/phase vs. time, esp. at scan and configuration boundaries
>   : episodes of partial or total coherence loss
>   : frequency labels and subband ordering
> 
> 2- Loss of time at configuration changes (OSRO->RSRO and RSRO->OSRO)
> 
> This is intended as a first test leading to ref.ptg. and high-frequency
> RSRO.
> 
> I can put together .indxr and .uvflg files if you like.
> 
> Thanks --
> 
>        Michael
> 
> p.s. Joe, would you like to JIRA this or shall I?  I'm not up to doing this
>   from home at the moment ;)
> 
> 
> 
> ---------- Forwarded message ----------
> Date: Wed, 30 Jun 2010 00:34:56 +0000
> From: VLA Operations <observe at nrao.edu>
> To: mrupen at nrao.edu, jmcmulli at nrao.edu
> Subject: EVLA Operator Log  2010-06-29_2338_TRSR0001
> 
> ******************************************************************************** 
> 
> 
> Filename:          2010-06-29_2338_TRSR0001
> Date:              29-Jun-2010              Program:         TRSR0001
> # Subarrays:       1                        Observing Mode:  Mixed Modes
> Configuration:     D                        Bands Used:      C
> Decommissioned:    7                        Initial Source:  J1331+3030
> Source File(s):    TRSR0001_sb1619941_1.evla
> Observer(s):       J1331+3030
> Observer's Email:  mrupen at nrao.edu, jmcmulli at nrao.edu
> Operator(s):       Matt Gardiner