0000073: There is no noise source step can be seen at 6Y(MFFE-15) at 92cm.
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ID Category Severity Reproducibility Date Submitted Last Update
0000073 [MFFE] noise source major always 17-09-08 13:41 22-10-08 07:55
Reporter Yuan Tang View Status public  
Assigned To Hans van der Marel
Priority normal Resolution fixed  
Status closed  
Summary 0000073: There is no noise source step can be seen at 6Y(MFFE-15) at 92cm.
Description This problem appeared before when MFFE-01 was on RT6.
Now it appears again(now the MFFE-15 is on RT6).
Additional Information I have looked at the two calibrator observations which were made by Jurjen yesterday.
The noise source step problem of 6Y appears only when we use FE phase switch. It
is ok without the phase switch.

Yuan
MFFE 15
RT 6
MFFE-band 92cm
polarisation Y
sky frequency (MHz)
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- Notes
(0000096)
Bert Woestenburg
15-10-08 10:53

 It seems most likely that the cause of the faulty 6Y noise source step is not in the MFFE(s), but is an error related to phase switching at system level. Hans van der Marel will, from now on, be the principal investigator of this problem.
 
(0000098)
Bert Woestenburg
22-10-08 07:53

 It is now clear that the noise step problem is caused by the phase switch pattern, which is not symmetric for the noise source 'on' state for 4Y, 5Y, 6Y and 7Y. Albert Bos will solve the problem after the VLBI-period. This action is now set to solved, but will continue with issue # 79: noise source step in 4Y too low
 

- Issue History
Date Modified Username Field Change
17-09-08 13:41 Yuan Tang New Issue
17-09-08 13:41 Yuan Tang MFFE  => 15
17-09-08 13:41 Yuan Tang RT  => 6
17-09-08 13:41 Yuan Tang MFFE-band  => 92cm
17-09-08 13:41 Yuan Tang polarisation  => Y
17-09-08 13:44 Yuan Tang Assigned To  => Harm-Jan Stiepel
17-09-08 13:44 Yuan Tang Status new => assigned
17-09-08 13:45 Yuan Tang Summary There is no noise source step can be seen at 6Y at 92cm. => There is no noise source step can be seen at 6Y(MFFE-15) at 92cm.
14-10-08 09:54 Yuan Tang Additional Information Updated
15-10-08 10:53 Bert Woestenburg Note Added: 0000096
15-10-08 10:53 Bert Woestenburg Assigned To Harm-Jan Stiepel => Hans van der Marel
22-10-08 07:53 Bert Woestenburg Note Added: 0000098
22-10-08 07:55 Bert Woestenburg Status assigned => closed
22-10-08 07:55 Bert Woestenburg Resolution open => fixed