Current Status Summary

Modified 16:39, 19 Oct 2012 by horneff | Page History

1. Hardware Status as of 17. October 2012
1. 1. 1.1.1. Electronics:
  2. 1.1.2. High Band Antennas:
  3. 1.1.3. Low Band Antennas:
2. Computer Status as of 20. January 2012:
1. 1. 2.1.1. Data Taking PCs
  2. 2.1.2. Server
3. Important or Interesting Webpages

Version as of 15:00, 30 Apr 2024

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Hardware Status as of 17. October 2012

Electronics:

All RCU modules plugged in.

High Band Antennas:

All tiles are working.

All broken FE modules were replaced during the maintenance visit.

Low Band Antennas:

All suspicious LBAs were replaced during the maintenance visit.

LBA 19 shows high noise in onle polarization direction, it is suspected that this is due to a broken cable.

Some (even-numbered) dipoles show little to no power in the spectrum (like as if the LNA is not working). The problem is not always consistent: some seem to recover without active intervention, some seem to recover after pulling and re-connecting the RCU.

Date	RCUs with low power in rcumode 3
Maintenance 16.10.2012	*	*	*	*	*	*	*	*	*	*	*	*	*	*	*	*	*	*	*
Wed 1.02.2012					68⁴	72⁴		78				104⁴	130⁴	138	148²	150	152⁴		178⁴
Wed 18.01.2012	*	*		*		72		78					130	138	148	150	152		178
Wed 21.9.2011	8	12	*	54²	68	72		78	82	*			130	138¹	148	150	152¹	164	178
Thu 11.8.2011	8	12	44	54		72		78	82	86			130	138¹	148	150	152¹	164	178
Fri. 8.7.2011^A	8	12	44		68	72	74³	78	82	86			130		148	150	152²	164	178
Mon 4.7.2011	8	12	44			72	74¹	78	82²	86			130		148	150		164	178
Fri 1.7.2011^A	8	12	44		68	72		78		86			130		148	150		164	178
Wed 29.6.2011^A	8		44			72		78		86	92			138	148	150		164

Notes:
^A No attempt to recover signal by switching rcumodes done.
¹Recovered after switching to rcumode 1 and back (a number of times)
²Showed changing power levels.
³ At 50-50 MHz about 10-15 dB reduced at 20 MHz about 30 dB reduced.
⁴ Normal power at some times, reduced power at others

* Replaced during maintenance visit, or before

Computer Status as of 20. January 2012:

Data Taking PCs

All lofarN machines are up

All lofarN machines have new RAID disks configured ad RAID5 (12.7 TB storage space in total per machine).

The lofarNa machines are installed and seem to be working.

Server

lofarsrv is up

Important or Interesting Webpages

The LOFAR Wiki: http://www.lofar.org/wiki/doku.php?id=start
Needs a login to see anything. If simply registering is not enough, contact Arno Schoenmakers for more access.
- Single station use at the LOFAR Wiki: http://www.lofar.org/wiki/doku.php?id=singlestation:start
  With quite a bit of information on dealing with a station, but rather unstructured.
- Technical operations contacts at the LOFAR Wiki: http://www.lofar.org/wiki/doku.php?id=operator:ilt_to_contacts
The international LOFAR schedule: http://www.astron.nl/lofar-schedule/schedule/schedule.php
(Stations not scheduled for an ILT observations are usually free for local observations)

Table of contents

Current Status Summary

Table of contents

Hardware Status as of 17. October 2012

Electronics:

High Band Antennas:

Low Band Antennas:

Computer Status as of 20. January 2012:

Data Taking PCs

Server

Important or Interesting Webpages

Table of contents