0000063: inconsistency of Amplitude in observation with 4096 channels
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ID Category Severity Reproducibility Date Submitted Last Update
0000063 [DZB] 0.unknown/unspecified major always 22-08-08 11:58 11-11-08 15:18
Reporter Yuan Tang View Status public  
Assigned To Jurjen Sluman
Priority normal Resolution reopened  
Status resolved  
Summary 0000063: inconsistency of Amplitude in observation with 4096 channels
Description When running msdecom for the observation with the settings of 1 band,2 polars,
4096ch,BW=5MHz, the amplitude consistency are too high both at XX and YY. The
problem comes from ifrs with 6X,6Y because the consistency value becomes normal
if not choosing 6X,6Y.
Additional Information The problem comes from 6X9X,6XDX,6Y9Y,6YDY
nr subbands 1
nr polarisations
nr channels
bandwidth
multi-subarray no
recirculation no
Attached Files  msdecom.txt [^] (769,266 bytes) 03-09-08 10:05

- Relationships

- Notes
(0000072)
Hans Weggemans
01-09-08 12:41

 probably not a problem in a correlatorboard.
this four interferometers are correlated on FOUR diffent correlatorboards
 
(0000073)
Jurjen Sluman
03-09-08 09:52

 Observation 10804096 has this setup.
We see that in the long MSDECOM output of the
ampl/ampl residual matrix - XX (Promille)
a high value for the 6X and 6Y combinations.
By not choosing 6X and 6Y it becomes normal,
but by also
choosing 6X and 6Y AND NOT choosing 9X and 9Y AND DX and DY it becomes normal.
This has to do with the consistency of the 6-combinations.
(see also the appended msdecom.log file)
Hans van Someren Greve will have a look why or what is the reason of these values.
 
(0000074)
Jurjen Sluman
03-09-08 14:47

 We did some test and the effect has disappeared.
It has been for more than 10 days in the system but could not be seen
in the latest test this morning.
So for now we will trace this problem.
 
(0000080)
Jurjen Sluman
09-09-08 11:08

 We have seen that after the reboot of the DZBSystem on 22-08-2008 that
this problem was there, after the reboot on 02-09-2008 is was disappeared.
This was also the date we did our tests for this problem and also after the reboot.
 
(0000083)
Jurjen Sluman
10-09-08 12:33

 The effect is now active again. (10-09-2008)
The only thing what has changed is a TMS reboot has been done,
NOT a DZBSystem reboot. So controllers has been stopped and started.
So far we know there are no new controllerversions of Read-/CtrlDZB.
 
(0000093)
Jurjen Sluman
01-10-08 11:51

 H v. Someren Greve has also looked for this problem, he remarks
that Albert Bos should have a look in the DZBSystem for this problem.
 
(0000102)
Jurjen Sluman
04-11-08 15:03

 CorBoard 5 from unit 3 changed with CorBoard 5 unit 2. Due to the 4096 channels problem. If there are now problems it should appear in the combinations 2=D= and 9=D=
 

- Issue History
Date Modified Username Field Change
22-08-08 11:58 Yuan Tang New Issue
22-08-08 11:58 Yuan Tang nr subbands  => 1
22-08-08 11:58 Yuan Tang multi-subarray  => no
22-08-08 11:58 Yuan Tang recirculation  => no
27-08-08 08:10 Yuan Tang Status new => assigned
27-08-08 08:12 Yuan Tang Assigned To  => Hans Weggemans
01-09-08 11:12 Yuan Tang Additional Information Updated
01-09-08 12:41 Hans Weggemans Note Added: 0000072
03-09-08 09:52 Jurjen Sluman Note Added: 0000073
03-09-08 09:52 Jurjen Sluman Assigned To Hans Weggemans => Jurjen Sluman
03-09-08 09:52 Jurjen Sluman Category correlator board => 0.unknown/unspecified
03-09-08 09:57 Jurjen Sluman File Added: msdecom.log
03-09-08 10:05 Jurjen Sluman File Added: msdecom.txt
03-09-08 14:40 Hans van der Marel File Deleted: msdecom.log
03-09-08 14:47 Jurjen Sluman Note Added: 0000074
03-09-08 14:47 Jurjen Sluman Status assigned => testing
03-09-08 14:47 Jurjen Sluman Resolution open => unable to reproduce
03-09-08 14:49 Jurjen Sluman Summary a problem from the correlator board => inconsistency of Amplitude in observation with 4096 channels
09-09-08 11:08 Jurjen Sluman Note Added: 0000080
10-09-08 12:33 Jurjen Sluman Note Added: 0000083
10-09-08 12:34 Jurjen Sluman Resolution unable to reproduce => reopened
01-10-08 11:51 Jurjen Sluman Note Added: 0000093
04-11-08 15:03 Jurjen Sluman Note Added: 0000102
11-11-08 15:18 Geert Kuper Status testing => resolved