Diff for "TelescopeSystemStatus"

Anchor(beginOfPage) (Date 2004-12-01)

TableOfContents(3)

System - General

NORMAL OPERATION

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Antenna

OK

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Wobbler

Avoid wobbler throw of 120"; with a throw of 120" the specification of a phase time may not work properly. With a throw of 119 or 121 is should be OK. (2003-07-09) Results from first pointing after unlocking the wobbler can be wrong! Usually it's sufficient to ignore the first pointing and repeat the pointing (2003-07-09)

Wobbler rotation implemented. Current range: +/- 60deg (2004-12-01 AW)

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Pointing Model

heterodyn: OK (last model update: 2004-11-17 ). bolometer: OK (last model update: 2004-11-02 ).

Operator/AOD: Check regularly that automatic P4 P5 is working (2002-12-13). Narrowband continuum pointing (for SiO masers) is out of service! (2003-07-09, 2003-07-30)

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SIS Receivers

A, B, C and D receivers are aligned within 3", checked (2003-09-24)

Calibration Tcold temperatures have been checked by receiver group. New scaling factor of 1.0 has been implemented into obs. Obs Tcold should be ok (2004-01-17)

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Pointing and Flux monitoring with SIS receivers:

Continuum instability ("ripple") can occur with all receivers, making pointing and focussing difficult.

• In general some receivers are better then others in this respect as summarized here:
  • A100 generally OK for pointing. (2003-11-12) B100 OK, will be replaced (2003-11-12) C150 often bad for pointing, ripple. (2002-07-16) D150 generally good performance for pointing.(2002-07-16) A230 often unstable, bad for pointing and flux monitoring. (2003-11-12) B230 OK, will be replaced (2003-11-12) C270 very bad for pointing at 265 Ghz. (2002-07-16) D270 can be unstable and difficult for pointing. (2002-07-16) HERA pointing difficulties using beam switch mode - total power mode gave better results (2004-01-17)

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HERA

Second polarization installed. One blind pixel. No SSB tuning tables except for few standard frequencies. Sideband rejections not determined (2004-12-01 AW)

Watch the computer control of the derotator closely (2002-12-22). Make sure the derotator tracking is stopped after observations, i.e, set to zero degrees in "frame". With VESPA, only two spectra per pixel can be used.

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Bolometers

Mambo II is installed and ready for operation (AW 2004-12-01)

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Backends

• 256 MHz shift in 100kHz FB header (AW 2004-12-01) Software and/or hardware problem in the 1MHz FB - problem is currently investigated (AW 2004-12-01) Spikes in VESPA at intersection of different units (AW 2004-12-01)

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Computer/Software

Mirroring between IRAM Grenoble ( http://www.iram.fr ) and Granada( http://www.iram.es/ ) websites sometimes takes several days to update. (2003-07-01)

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Other Items

OK

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Updates/History

(in reverse order by date!)

• 2004-12-01 AW BR 2004-07-24 RM BR 2004-03-24, 25 HU BR 2004-01-17 AW BR 2003-11-12 HU BR 2003-09-25 MR BR 2003-09-08 HU BR 2003-08-20 HU BR 2003-08-05 AS BR 2003-07-09 RM BR 2003-07-01,04/5, 7 HU BR 2003-06-08, 09 HU BR 2003-04-22, 26 HU BR 2003-04-06 AS BR 2003-03-31 HU BR 2003-03-20 RM BR 2003-02-11 AW BR 2003-01-10, 2003-01-17, 2003-02-05 RM BR 2003-01-14 TG BR 2003-01-03, 06 HU BR 2002-12-31 HU BR 2002-12-21, 22 HU BR 2002-12-19 RM BR 2002-12-13, 14, 15, 16 HU BR 2002-12-11 RM BR 2002-12-05 TG BR 2002-11-27 RM BR 2002-11-05 AW BR 2002-10-18 DJ BR 2002-10-15 DJ BR 2002-10-09, 12, 14 HU BR 2002-10-08 AW BR 2002-09-27 TG BR 2002-09-26 DJ BR 2002-09-23 AW BR 2002-09-11/12, 17 HU BR

• .. (?) BR 2002-08-07,10 HU BR 2002-07-22 DJ BR

• .. (?) BR 2002-07-16 HU BR

• .. (?) BRBR

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Created by R. Mauersberger, June 18th, 2002