0000296: RT7 often no correlated signal. Probably a bad LO cable.
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ID Category Severity Reproducibility Date Submitted Last Update
0000296 [RT] 0.unknown/unspecified major random 08-10-10 10:14 06-03-12 13:09
Reporter Jurjen Sluman View Status public  
Assigned To Harm-Jan Stiepel
Priority high Resolution open  
Status testing  
Summary 0000296: RT7 often no correlated signal. Probably a bad LO cable.
Description The correlated signal of RT7 sometimes drops out.
This is mostly seen after start of a new measurement in the -90 - -60 HA range.
The signal does not come back by itself during the measurement.
Harm Jan has already noticed a wrong LO status during such an event.
Additional Information 20101012
RT7 problem
It happened quite often that the cross correlations of 7X*X,7Y*Y have no Ampls
after the observation started from HA -90 deg. It might be caused by a bad HA
jumper cable for the LO in RT7.

20101015
On RT7 the problem of bad connection of the LO cable around HA-90 deg has been
solved after changing the LO cable yesterday.
RT 7
Attached Files

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- Notes
(0000351)
Jurjen Sluman
20-07-11 08:05

 The Jumper is allready changed out, but there are still problems with a RT7
In Lband observations there is no cross. corr. data and the env of mffe (made by PD) shows a not correct LO signal for this RT.
So the problem is not solved.
 
(0000352)
Jurjen Sluman
21-07-11 09:25

 After a reset of the MFFEdeamon there was cross corr. data again.
The LO was not locked, after reset it is possible again for LBand.
 

- Issue History
Date Modified Username Field Change
08-10-10 10:14 Geert Kuper New Issue
08-10-10 10:14 Geert Kuper RT  => 0
08-10-10 10:14 Geert Kuper Assigned To  => Harm-Jan Stiepel
08-10-10 10:14 Geert Kuper Status new => assigned
12-10-10 11:44 Yuan Tang Additional Information Updated
15-10-10 11:47 Yuan Tang Status assigned => resolved
15-10-10 11:47 Yuan Tang Additional Information Updated
20-07-11 08:05 Jurjen Sluman RT 0 => 7
20-07-11 08:05 Jurjen Sluman Note Added: 0000351
20-07-11 08:05 Jurjen Sluman Reporter Geert Kuper => Jurjen Sluman
20-07-11 08:05 Jurjen Sluman Status resolved => progressing
21-07-11 09:25 Jurjen Sluman Note Added: 0000352
06-03-12 13:09 Harm-Jan Stiepel Status progressing => testing