0000072: UHFlow fails
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ID Category Severity Reproducibility Date Submitted Last Update
0000072 [RT] UHF-low minor always 17-09-08 07:53 20-04-09 07:15
Reporter Geert Kuper View Status public  
Assigned To Harm-Jan Stiepel
Priority normal Resolution fixed  
Status resolved  
Summary 0000072: UHFlow fails
Description Harm Jan has already replaced the UHFLow X-channel LNA's without result.
He also replaced the microswitches from the antenna, but it stays in the 'in'
position.
Thursday 18 september 2008 he will try to solve it, by replacing some modules.
Additional Information
RT A
Attached Files

- Relationships

- Notes
(0000089)
Yuan Tang
17-09-08 13:11

 After the maintenance on RTA yesterday, now the Ampls of all baseline with RTA
are low(about 30-40% lower). It can be seen at 92cm,6cm and 13cm data. Could
it be caused by the flap for UHFlow at the wrong position?
 
(0000106)
Bert Woestenburg
12-11-08 12:15

 The problem with the amplitudes on all baselines with RTA was solved on 18-09-08 by putting the UHFlow flaps in the right position. The original problem remains (UHFlow fails), but has low priority.
 
(0000147)
Jurjen Sluman
17-04-09 12:19

 Op donderdag 16 april is de UHFLow antenne van RTA gerepareerd. Omdat het IFX signaal van de UHFLow
30 dB te laag was zijn ook de LNA's vervangen. Dit heeft niet geleid tot een verhoging van het uitgangs niveau.
Mogelijk is er een probleem met het UHFLow traject in het FE .
Omdat de SPINNER connector van de LO kabel van de telescoopaansluitkast van RT2 defect is, de LO aangesloten
op een andere kleur, was WIT nu op GROEN.
 

- Issue History
Date Modified Username Field Change
17-09-08 07:53 Geert Kuper New Issue
17-09-08 07:53 Geert Kuper RT  => A
17-09-08 07:56 Geert Kuper Assigned To  => Bert Woestenburg
17-09-08 07:56 Geert Kuper Status new => assigned
17-09-08 07:57 Geert Kuper Assigned To Bert Woestenburg => Harm-Jan Stiepel
17-09-08 13:11 Yuan Tang Note Added: 0000089
12-11-08 12:15 Bert Woestenburg Note Added: 0000106
17-04-09 12:19 Jurjen Sluman Note Added: 0000147
20-04-09 07:15 Jurjen Sluman Status assigned => resolved
20-04-09 07:15 Jurjen Sluman Resolution open => fixed