0000392: The TP of Band2,6X is unstable, jumped up and down.
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ID Category Severity Reproducibility Date Submitted Last Update
0000392 [DZB] 0.unknown/unspecified major sometimes 27-01-12 15:22 14-05-12 12:25
Reporter Yuan Tang View Status public  
Assigned To Juergen Morawietz
Priority normal Resolution open  
Status closed  
Summary 0000392: The TP of Band2,6X is unstable, jumped up and down.
Description The TP of Band2,6X is unstable, jumped up and down.
Additional Information on 18.1.2012 we localized a defective sampler unit. (See Issue 0000390)
After replacement on ADC board, this channel seems to be instable.

on 31.1.2012 I interchanged the filter, DDS and converterunits in
the rack with band 3 of the same telescope and polarization.

now testing whether the problem moves to band 3 or remains in band 2.

Juergen, 1.2.2012

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Problem has moved to band 3, so I replaced the filter- and the converterunit
of band 3. The DDS was not replaced.

status is 'resolved'.

Juergen, 3.2.12

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closed issue.

Juergen 14.5.2012

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nr subbands 1
nr polarisations
nr channels
bandwidth
multi-subarray no
recirculation no
Attached Files

- Relationships

- Notes
(0000375)
Yuan Tang
01-02-12 12:11

 To track the problem of the TP unstable on Band2,6X, the units of LO,Filter,Converter on
  Band2,6X had been swapped with Band3,6X yesterday afternoon. Now the TP of Band3,6X
  is unstable. So the problem comes from the unit of LO, or Filter, or Converter in the IVC.
 
(0000378)
Yuan Tang
02-02-12 16:05

 The converter and filter units of Band3,6X has been replaced tis morning to
  solve the problem of unstable TP.
 

- Issue History
Date Modified Username Field Change
27-01-12 15:22 Yuan Tang New Issue
27-01-12 15:22 Yuan Tang nr subbands  => 1
27-01-12 15:22 Yuan Tang multi-subarray  => no
27-01-12 15:22 Yuan Tang recirculation  => no
27-01-12 15:23 Yuan Tang Assigned To  => Juergen Morawietz
27-01-12 15:23 Yuan Tang Status new => assigned
01-02-12 08:55 Juergen Morawietz Status assigned => testing
01-02-12 08:55 Juergen Morawietz Additional Information Updated
01-02-12 08:58 Juergen Morawietz Additional Information Updated
01-02-12 12:11 Yuan Tang Note Added: 0000375
01-02-12 12:11 Yuan Tang Status testing => assigned
02-02-12 16:05 Yuan Tang Note Added: 0000378
02-02-12 16:05 Yuan Tang Status assigned => resolved
03-02-12 08:42 Juergen Morawietz Additional Information Updated
14-05-12 12:25 Juergen Morawietz Status resolved => closed
14-05-12 12:25 Juergen Morawietz Additional Information Updated