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System - General

/!\ The 30-m telescope is now operating using the New Control System (NCS) (2005-11-30 HU)

NCS supports only source coordinates in Equatorial J2000.0 system. (More systems will be made available as soon as possible)

NCS supports observing modes and source offsets in:

All 4 Switching Modes are supported by the NCS (total power, beam switching, wobbler switching, frequency switching.)

Observing modes supported by the NCS:

/!\ A prototype of automatic processing of heterodyne data using the MIRA software is available. Its features will be expanded as soon as possible. MIRA can also be run manually and offline. (2006-02 HU)

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Antenna

(./) OK

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Wobbler

Available under NCS.

/!\ Wobbler rotation (actually, secondary rotation) not yet available under NCS.

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Pointing Model

heterodyne: OK, (last model update: 2006-01-30 15:16).

bolometer: OK, (last model update: 2006-02-09 08:35).

/!\ Pointing on spectral line sources like SiO masers is not available.

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SIS Receivers

(./) A, B, C, D receivers are supported by NCS for observations.

/!\ Some problems reported from B100: difficult to lock/tune at some frequencies, higher Trx, ...

/!\ Image/Signal gain-ratio calibration is not yet supported by NCS.

(./) Standard table of T_cold calibration temperatures (same as in old CS) is implemented in NCS; note that this covers only a limited standard range of frequencies. /!\ Outside this range, T_cold has to be set manually.

/!\ Receiver C150 shows low continuum signal at the higher frequencies (>168 GHz). It has to be fully checked. Use D150 instead. (2005-11-16)

(./) HERA is supported by the NCS. (2006-02 HU)

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Pointing and Flux monitoring with SIS receivers:

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

In general some receivers are better then others in this respect as summarized here:

/!\ Beam Switch is broken, when using wobbler switching, MIRA gives wrong pointing corrections, use SET POINTING dAzm+beamthrow/2 dElv, where dAzm, dElv are the values computed by MIRA. In addition MIRA seems not to subtract a baseline, so the results are mostly useless (2006-01-09, AS).

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HERA

(./) HERA is supported by the NCS. (2006-02 HU)

Second polarization installed. /!\ One blind pixel. BR SSB tuning tables for standard frequencies. BR Sideband rejections not determined (2004-12-01 AW) BR

/!\ Watch the computer control of the derotator closely (2002-12-22). BR /!\ Make sure the derotator tracking is stopped after observations, i.e, set to zero degrees in "frame". BR /!\ With VESPA, the maximum of 4 spectra per pixel can be used. BR /!\ /!\ Much higher noise in HERA 2 than HERA 1 when using Vespa. This is being investigated by S. Navarro [RM 30.6.2005]BR

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Bolometers

(./) Bolometer Observations are supported by the NCS.

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Backends

Support by NCS:

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Computer/Software

/!\ The 30-m telescope is now operating using the New Control System (NCS) (2005-11-30 HU). Note that the NCS so far supports only a restricted set of features!

/!\ Raw data processing software for heterodyne (MIRA) has to be run manually. (Will be automatic as soon as possible!)

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Other Items

OK

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Updates/History

To see the changes between the actual and the last version, please see Show Changes in the Wiki Interface. If you want to see the Revision History of this page, please see Get Info in the Wiki Interface.

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Legend

(./) : OKBR /!\ : WarningBR {X} : ErrorBR

The wiki markup of these icons is:

{{{(./) : OK /!\ : Warning {X} : Error }}}

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