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information_for_astronomers:rx:p3mm
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information_for_astronomers:rx:p3mm [2013/03/12 14:55] 127.0.0.1 external edit |
information_for_astronomers:rx:p3mm [2020/11/05 15:35] akraus |
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| ====== 3mm primary focus receiver (84000-95500 MHz) ====== | ====== 3mm primary focus receiver (84000-95500 MHz) ====== | ||
| - | This is a 3-channel dual-feed system designed for VLBI observations. Since some years there exists a NASA satellite that operates a radar at 90 GHz. The radar is called CloudSat and is powerful enough too not only produce RFI, but it can also destroy the receiver when passing inside the beam. Please check the [[http://www-angler.larc.nasa.gov/cloudsat/|CloudSat homepage]] when planning 3mm observations. The CloudSat page also provides a forecast for satellite passages at specific radio observatories: [[http://www-angler.larc.nasa.gov/cgi-bin/cloudsat/closest.cgi?sat=CLOUDSAT&elevangle=10.0&dist=ALL&fname=_SUBSAT_10SEC.TXT&lat=50.5256&lon=6.8833&sitename=Effelsberg_Germany|here for Effelsberg.]] | + | This is a 3-channel dual-feed system designed for VLBI observations. It is also available for continuum and spectroscopic observations, but one should be aware that the |
| + | observatory is located at rather low elevation and the weather conditions are not ideal for mm-observations. | ||
| + | |||
| + | Since some years there exists a NASA satellite that operates a radar at 90 GHz. The radar is called CloudSat and is powerful enough too not only produce RFI, but it can also destroy the receiver when passing inside the beam. Please check the [[http://cloudsat.atmos.colostate.edu/home/|CloudSat homepage]] when planning 3mm observations. The CloudSat page also provides a forecast for satellite passages at specific radio observatories: [[https://angler.larc.nasa.gov/cgi-bin/cloudsat/closest.cgi?sat=CLOUDSAT&elevangle=10.0&dist=ALL&fname=_SUBSAT_08SEC.TXT&lat=50.5256&lon=6.8833&sitename=Effelsberg_Germany|here for Effelsberg.]] | ||
| ==== Calibration Information ==== | ==== Calibration Information ==== | ||
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| | 6 | VLBA | cross | cos AB | | | 6 | VLBA | cross | cos AB | | ||
| | 7 | VLBA | cross | sin AB | | | 7 | VLBA | cross | sin AB | | ||
| + | |||
| + | ==== Spectroscopy modes and resolution ==== | ||
| + | ^ BW ^ nchan ^ nu ^ Df ^ Dv ^ dv ^ | ||
| + | ^ MHz ^ ^ MHz ^ kHz ^ km/s ^ km/s ^ | ||
| + | | 100 | 32768 | 85000 | 3.1 | 0.011 | 0.012 | | ||
| + | | 100 | 32768 | 87000 | 3.1 | 0.011 | 0.012 | | ||
| + | | 100 | 32768 | 89000 | 3.1 | 0.010 | 0.012 | | ||
| + | | 100 | 32768 | 91000 | 3.1 | 0.010 | 0.012 | | ||
| + | | 100 | 32768 | 93000 | 3.1 | 0.010 | 0.011 | | ||
| + | | 100 | 32768 | 95000 | 3.1 | 0.010 | 0.011 | | ||
| + | | 500 | 32768 | 85000 | 15.3 | 0.054 | 0.062 | | ||
| + | | 500 | 32768 | 87000 | 15.3 | 0.053 | 0.061 | | ||
| + | | 500 | 32768 | 89000 | 15.3 | 0.051 | 0.060 | | ||
| + | | 500 | 32768 | 91000 | 15.3 | 0.050 | 0.058 | | ||
| + | | 500 | 32768 | 93000 | 15.3 | 0.049 | 0.057 | | ||
| + | | 500 | 32768 | 95000 | 15.3 | 0.048 | 0.056 | | ||
| + | |||
| + | BW ... band width\\ | ||
| + | nchan ... number of spectral channels\\ | ||
| + | nu ... center frequency\\ | ||
| + | Df ... Channel separation (in frequency)\\ | ||
| + | Dv ... Channel separation (in velocity)\\ | ||
| + | dv ... Velocity resolution (dv=1.16*Dv) | ||
| ==== Tcal and Tsys measurements ==== | ==== Tcal and Tsys measurements ==== | ||
information_for_astronomers/rx/p3mm.txt · Last modified: 2023/05/04 15:16 by ubach
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