COLD NEWS

The proposal cover sheet has been upgraded. Please use ver 4.10.(2008-10-30)

Proposal information for open-use observation in 2009 season is now open.(2008-09-03)

The deadline of General Program has been postponed to 11 November 2008.

IF1 attenuator is broken (May 6-13, 2008)

The 1dB-step attenuator of IF #1 is broken. Please do not use IF 1.

Export version of NOSTAR

Export version of OTF reduction software is released. (Mar. 31, 2008)

Antenna efficiencies for 2007-2008 season

The antenna efficiencies in the 2007-2008 season is presented. (Mar. 13, 2008)

A bandpass filter of IF2 cannot be used. (Feb. 25-26, 2008)

The 5.1--5.6 GHz bandpass filter of the IF 2 was broken, and seems to be "spontaneously" repaired.

AOS-H7 cannot be used. (Dec. 29, 2007-Feb. 5, 2008)

The LO attenuator of the AOS-H6 is broken.

AOS-H6 cannot be used. (Jan. 3-8, 2008)

The step attenuator of the AOS-H6 sometimes does not function.

Export (beta) version of NOSTAR

Public beta release of Export version of OTF reduction software. (2007-11-30)

BEARS star formation project

Data from BEARS star formation project is open. (2007-08-28)

Status report

Status Report for 2007-2008 season is now open. (2007-06-15)

Proposal information

Proposal information for open-use observation in 2007-2008 season is now open. (2007-06-06)

IF7 attenuator is broken (Apr. 27-May 1, 2007)

The 1dB-step attenuator of IF #7 is broken. Please do not use IF 7.

Beam efficiencies for 2006-2007 season

Beam efficiencies are released. (2007-04-25)

BEARS scaling factors for 2006-2007 season

BEARS calibration data (scaling factors) are released. (2007-04-19)

BEARS (CH15) cannot be used. (Mar. 19-21, 2007)

Due to a snapping of an IF cable, CH15 of BEARS cannot be used since Mar. 19. And a trouble of the refrigerator which occurred succeedingly makes all the 25 beams unavailable (Mar. 20). Both troubles are fixed by Mar. 21.

The AOS-H7 cannot be used (Mar. 1-13, 2007)

The 4th local oscillator for AOS-H7 is broken.

IF2 attenuator is broken (Feb. 22-27, 2007)

The 1dB-step attenuator of IF #2 is broken. Please do not use IF 2.

Trouble on AC-03 (Feb. 13-14, 2007)

Due to a trouble on a digital spectrometer A03, CH13 of BEARS cannot be used.

We have renewed the Web site. (Feb. 7, 2007)

Old page (Japanese)

Status of AOS-W1 (Feb. 6-14, 2007)

The band characteristics of AOS-W1 was found to be bad. Please do not assign important lines only in this spectrometer.
--> It turned out to be OK.

Operation resumed

The 45 m telescope was temporary repaired, and the operation (common use observations) has started again. For details see the top page of this observatory. (Feb. 5, 2007)

Operation Interrupted (Jan.-Feb. 5, 2007)

The operation of the 45 m telescope is now stopped due to the trouble of the driving system. For details see the top page of this observatory. (Jan. 24, 2007)

Schedule of open use observations in 2006-2007 season

We now open the OTF observing mode.

OTF (On The Fly) mode is available for open use.

Change of 45-m manager

N. Kuno has became the manager of the telescope in succession to K. Sunada. (Nov. 2006)

The frequency converter of AOS-H3 is now broken.

Unfortunitely AOS-H3 cannot be used. (March 28 - April 4, 2006)

The H40 receiver was replaced.

The 1st IF and the side band were changed (9.8 ---> 6.0 GHz, LSB ---> USB). You can get a sample file from the window of the device table.

Present status of AOS (Dec. 2004-)

Present status of BEARS

At present a channel 25 cannot be used due to the breaking of the wire (Dec. 31, 2004-Jan. 27, 2005).

The intensity calibration system of the old port (old MMC) is broken (Jan. 8-19, 2005)

Please use LOAD1 (LD1) instead of the old MMC for the observations with the H40, H32/28, and H22 receivers.

For this coming observational season, we are measuring the telescope performance and adjusting the basic parameters (subreflector, pointing, beam squint, efficiency, etc.).

The adjustment of the subreflector position and the revision of pointing parameters have already finished.

The operation of the 45m radiotelescope in this season finished. (31 May 2004-)

On 27 May the operation in this observational season finished. In addition to the usual maintenance works, we are going to replace the control system of the telescope in this summer.

Trouble of AOS-W4 (13 April 2004-)

The baseline of AOS-W4 may be bad. Please do not assign important lines only in this spectrometer.

The revisions of OBSTABLE (2 Dec. 2003-)

A device table for line observations was revised to include the digital backend for connection with the single beam receivers. When you want to use old device tables for lines, please get them from the 'File List' and re-save, evenif you do not use the digital backend.
A device table for BEARS was also revised. A function 'Random' as a backend option was added. When you want to use old device tables for BEARS, first please get them from the 'File List'. Then, you will see that the position angles are blank, and that the bandwidths are not selected. Please complete the tables and re-save.
A scan table for OTF can be selected from the main panel, but it is only for the test purposes and not open for common use observations.

The use of the digital backend for the single beam receivers (2 Dec. 2003-)

From this observing season, it is possible to connect the digital backend to the single beam receivers. The manual will be available soon. For details please ask to Dr. Sunada.

Present status of AOS (Dec. 2003-)

Trouble of AOS-W4 (9-13 April 2004)

At present fringe noise appears at half of the channel ranges of AOS-W4. Please do not assign important lines only in this spectrometer.

Trouble of AOS-H8 (2 Dec. 2003 - 9 March 2004)

At present the final local oscillator for AOS-H8 is broken, and consequently, H8 cannot be used.

Trouble of an attenuator at IF7 6-2 GHz converter (8-9 Dec. 2003)

Please do not use the IF7, or use it with even number (dB) of attenuation in the device table (ask to the assistant). In this case, please do not assign important lines only in the IF7.

Now the 45m telescope is not operated for the maintenance. (deleted 28 Nov. 2003)

Problem of the band selection board (1 April 2003 -)

The S100 receiver cannot be connected to the IF 7 line. Please do not assign the IF 7 line for the S100 receiver.

PLL problem of the S100 receiver (18 March 2003 -)

The PLL of S100 does not work well at the local frequency of 87.925 GHz. Please avoid to use this local frequency.

Tuning of the S100/S80 receivers (Dec. 2002 -)

Almost complete tuning can be done by PC at the control room. In this tuning process bias voltage is not adjusted. If this adjustment is necessary to obtain maximum performance, please ask to the assistant.

Present status of BEARS

A channel 3-2 could not be used due to the problem of the amplifier (Dec. 2002-). This problem has already been solved by recent maintenance work (4 Feb. 2003-). The calibration data of this channel will be obtained in near future. Recently level of this channel sometimes becomes unstable (1 April 2003-).
The IF level of a channel 3-4 may become unstable. In this case spectra of this channel become strange. If this happens, please call the assistant (25 Feb. 2003-).
The IF level of a channel 2-3 may become unstable. If this happens, please call the assistant (13 March 2003-).
A channel 2-4 cannot be used due to disconnection of the line inside (14 April 2003-).

Information on the local oscillators of the H22 receiver

Please note that the tuning ranges of the local (Gunn) oscillators of H22 is not completely continuous. The tuning ranges are 14.75-15.25 GHz, 16.7-17.25 GHz, and 18.7-19.3 GHz. Their will be no big problem, because the bandwidth of H22 is rather wide (2 GHz).

Present status of AOS (Dec. 2002-)

Connection of cables for continuum observations (NOBA and other receivers)(Dec. 2002-)

This connection became automatic by using a switch box. Please click 'start tuning' in the main console to make this connection effective before continuum observations.

Low performance of the S100 receiver (ca. 11 March 2003 -) (deleted 1 April 2003)

The performance of S100 is unfortunitely slightly low at present. Roughly speaking it is better to use S80 instead of S100 for observations below 100 GHz. For observations above 100 GHz S100 seems better than S80. For details please ask the people maintaining the receivers.

Trouble of IF6 (19 March 2003 -) (deleted 25 March 2003)

The system temperature of AOSs connected to IF6 is now abnormally low. Please avoid to use IF6.

Trouble of an attenuator (14 March 2003-) (deleted 17 March 2003)

An attenuator of IF6 at 6 to 2 GHz converter is now broken. Please do not use the IF6 line.

Present status of BEARS (deleted 18 Feb. 2003)

A channel 3-2 cannot be used due to the problem of the amplifier (Dec. 2002-). This problem may have already been solved by recent maintenance work (4 Feb. 2003-).
Please operate with the angle range of +138 to -20 degree of the rotational stage. Otherwise a channel 3-3 may become unstable (Dec. 2002-). This problem may have already been solved by recent maintenance work (4 Feb. 2003-).

Trouble of an attenuator at IF8 6-2 GHz converter (7-17 Feb. 2003)

In case of odd number (dB) of attenuation, signal does not pass. Please do not use the IF8, or use it with even number (dB) of attenuation (ask to the assistant).

2008-06-26 nro45mrt @ NRO