0000388: At 92cm,21cm,6cm the ampls of *YCY(RTC/MFFE-04) are low in all bands.
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ID Category Severity Reproducibility Date Submitted Last Update
0000388 [MFFE] 0.unknown/unspecified major always 19-12-11 13:54 18-01-12 13:03
Reporter Yuan Tang View Status public  
Assigned To Harm-Jan Stiepel
Priority normal Resolution open  
Status progressing  
Summary 0000388: At 92cm,21cm,6cm the ampls of *YCY(RTC/MFFE-04) are low in all bands.
Description At 92cm the ampls of *YCY(RTC/MFFE-04) are low in all bands.
Additional Information 20111220
About the problem on the cross-correlations of *YCY:
  Yesterday I mentioned the problem may come from the MFFE because I see the
 Ampls of *YCY are low at 92cm. Now I also see the ampls of *YCY are low and
 unstable at 18cm, and also unstable at 21cm. So I think it should be a problem
 from the backend, from the equalizer(or connection problem of CY)?


20120118:
regarding Observers log, Harm-Jan has temporary solved the problem
by putting an DC amplifier in the phase control line.
So I assigned this issue to Harm-Jan.
- Juergen -
MFFE 04
RT C
MFFE-band 92cm, 21cm, 18cm
polarisation Y
sky frequency (MHz)
Attached Files

- Relationships

- Notes
(0000370)
Juergen Morawietz
20-12-11 15:28

 20111220:

Backend seemed to be okay.

diagnostics (together with Harm-Jan): it seems that the phase switching
does not work.

This might be caused by a defective transzorb diode in the lighning
protection units in the front-end box.

Status set to "progressing"

- Juergen -
 
(0000371)
Yuan Tang
22-12-11 10:29

 20111222
The CY phase switch works again after puting the DC amplifier into the CY
phase control line(a temporary solution). The lightning protection unit will
be replaced later on.
 

- Issue History
Date Modified Username Field Change
19-12-11 13:54 Yuan Tang New Issue
19-12-11 13:54 Yuan Tang MFFE  => 04
19-12-11 13:54 Yuan Tang RT  => C
19-12-11 13:54 Yuan Tang MFFE-band  => 92cm
19-12-11 13:54 Yuan Tang polarisation  => Y
19-12-11 13:54 Yuan Tang Assigned To  => Harm-Jan Stiepel
19-12-11 13:54 Yuan Tang Status new => assigned
20-12-11 09:53 Yuan Tang MFFE-band 92cm => 92cm, 21cm, 18cm
20-12-11 09:53 Yuan Tang Assigned To Harm-Jan Stiepel => Juergen Morawietz
20-12-11 09:53 Yuan Tang Additional Information Updated
20-12-11 15:28 Juergen Morawietz Note Added: 0000370
20-12-11 15:28 Juergen Morawietz Status assigned => progressing
22-12-11 10:29 Yuan Tang Note Added: 0000371
22-12-11 10:29 Yuan Tang Summary At 92cm the ampls of *YCY(RTC/MFFE-04) are low in all bands. => At 92cm,21cm,6cm the ampls of *YCY(RTC/MFFE-04) are low in all bands.
18-01-12 13:03 Juergen Morawietz Assigned To Juergen Morawietz => Harm-Jan Stiepel
18-01-12 13:03 Juergen Morawietz Additional Information Updated