0000391: The TPs of RT0/MFFE-16 dropped out at both X and Y for unknown reason.
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ID Category Severity Reproducibility Date Submitted Last Update
0000391 [MFFE] 0.unknown/unspecified major sometimes 26-01-12 14:40 01-02-12 12:14
Reporter Yuan Tang View Status public  
Assigned To Harm-Jan Stiepel
Priority normal Resolution open  
Status resolved  
Summary 0000391: The TPs of RT0/MFFE-16 dropped out at both X and Y for unknown reason.
Description At 92cm the TPs of RT0/MFFE-16 dropped out at both X and Y for unknown reason.
(It can be seen from the plotted TPs from the MFFE-16.)
Additional Information Another problem on RT0:
It happened several times that the TPs of 0X,0Y dropped out, it appeared
at 92cm,21cm,13cm. Could it be caused by the bad connection of the jumper?
(should cause the problem at both X and Y)

From Hans van der Marel:
It seems that the LO looses lock and this can indeed be due to a bad LO cable in the jumper, but it can also be due to a bad synthesizer in the MFFE.


MFFE 16
RT 0
MFFE-band 92cm
polarisation X, Y
sky frequency (MHz)
Attached Files

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- Notes
(0000374)
Yuan Tang
30-01-12 16:33

 The problem on RT0/MFFE-16(from the test observations today):
At 13cm and 92cm there are no TPs of 0X,0Y from MFFE-16, and there are no
Ampls of cross-correlations of 0X*X,0Y*Y.
 
(0000376)
Yuan Tang
01-02-12 12:14

 The RT0/MFFE-16 works again at 13cm,92cm after the LO-low unit had been replaced
  in the MFFE-16 yesterday afternoon.
 

- Issue History
Date Modified Username Field Change
26-01-12 14:40 Yuan Tang New Issue
26-01-12 14:40 Yuan Tang MFFE  => 16
26-01-12 14:40 Yuan Tang RT  => 0
26-01-12 14:40 Yuan Tang MFFE-band  => 92cm
26-01-12 14:40 Yuan Tang polarisation  => X, Y
26-01-12 14:41 Yuan Tang Assigned To  => Harm-Jan Stiepel
26-01-12 14:41 Yuan Tang Status new => assigned
27-01-12 15:21 Yuan Tang Summary At 92cm the TPs of RT0/MFFE-16 dropped out at both X and Y for unknown reason. => The TPs of RT0/MFFE-16 dropped out at both X and Y for unknown reason.
27-01-12 15:21 Yuan Tang Additional Information Updated
30-01-12 16:33 Yuan Tang Note Added: 0000374
30-01-12 16:33 Yuan Tang Additional Information Updated
01-02-12 12:14 Yuan Tang Note Added: 0000376
01-02-12 12:14 Yuan Tang Status assigned => resolved