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information_for_astronomers:rx:s14mm
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information_for_astronomers:rx:s14mm [2019/03/03 13:37] bwinkel [Tcal measurements] |
information_for_astronomers:rx:s14mm [2024/07/10 16:23] (current) akraus |
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| - | ====== 1.3cm double beam secondary focus receiver (18000-26000 MHz) ====== | + | ====== 1.3cm double beam secondary focus receiver (18000-26000 MHz) ====== |
| - | This receiver replaced the old 1.3cm secondary focus system. However, some modes, especially | + | This is a two horn system especially for continuum, spectroscopy and VLBI observations. |
| - | for broad-band observations are still under commissioning and are not yet available! | + | |
| - | This is a two horn system for continuum, spectroscopy and VLBI observations. The system is currently tested and all values are preliminary. \\ | + | ==== Overview ==== |
| - | **Note, that for technical reasons, no spectroscopic frequency-switch observations are possible!** | + | |
| + | ^ RX Name ^ [[information_for_astronomers:rx:bands|Band]] ^ Frequency range [GHz] ^ Polarisation^Nr. of Horns ^Horn position relativ to center of focus cabin^ | ||
| + | | **S14mm** | K | 18.0-26.0 | dual-circular| 2 | Horn 1: Az: -95.6 arcsec, Elv: 734.2 arcsec,\\ Horn 2: Az: 95.6 arcsec, Elv: 734.2 arcsec| | ||
| ==== Calibration Information ==== | ==== Calibration Information ==== | ||
| ^ Frequency [GHz] ^ Channel ^ Polarisation ^ Tcal [K] ^ Tsys [K] ^ Sensitivity [K/Jy] ^ SEFD [Jy] ^ Aperture Eff. [%] ^ TMB/S [K/Jy] ^ Main Beam Eff. [%] ^ FWHM [arcsec] ^ Last update ^ | ^ Frequency [GHz] ^ Channel ^ Polarisation ^ Tcal [K] ^ Tsys [K] ^ Sensitivity [K/Jy] ^ SEFD [Jy] ^ Aperture Eff. [%] ^ TMB/S [K/Jy] ^ Main Beam Eff. [%] ^ FWHM [arcsec] ^ Last update ^ | ||
| - | | 19.0 | 1 | LCP | 49 | 39 | 1.05 | 37 | 37 | 1.56 | 67 | 41.9 | Jan 2014 | | + | | 19.25 | 1/2 | LCP/RCP | 13.1 | 47 | 1.09 | 43 | 38 | 1.56 | 67 | 40.4 | Jul 2024 | |
| - | | 21.0 | 1 | LCP | 37 | 51 | 1.07 | 48 | 38 | 1.74 | 61 | 39.5 | Jan 2014 | | + | | 21.15 | 1/2 | LCP/RCP | 9.2 | 67 | 1.05 | 64 | 37 | 1.74 | 61 | 37.8 | Jul 2024 | |
| - | | 22.35 | 1 | LCP | 9.1 | 70 | 1.03 | 68 | 36 | 1.6 | 64 | 39.1 | Jun 2015* | | + | | 22.85 | 1/2 | LCP/RCP | 9.0 | 74 | 1.03 | 72 | 36 | 1.41 | 79 | 36.8 | Jul 2024 | |
| - | | 22.35 | 1 | RCP | 9.6 | 71 | 1.06 | 67 | 37 | 1.6 | 67 | 39.3 | Jun 2015* | | + | | 24.75 | 1/2 | LCP/RCP | 8.0 | 72 | 1.01 | 71 | 36 | 1.57 | 71 | 34.5 | Jul 2024 | |
| - | | 23.0 | 1 | LCP | 9.5 | 58 | 1.12 | 52 | 39 | 1.41 | 79 | 37.6 | Jan 2014 | | + | | 22.25 | 1/2 | LCP/RCP | 8.4 | 72 | 1.05 | 71 | 36 | 1.57 | 71 | 36.8 | Jul 2024 | |
| - | | 25.0 | 1 | LCP | 8.0 | 59 | 1.12 | 53 | 39 | 1.57 | 71 | 35.6 | Jan 2014 | | + | | 23.77 | 1/2 | LCP/RCP | 8.0 | 72 | 1.03 | 71 | 36 | 1.57 | 71 | 35.2 | Jul 2024 | |
| ^ normalized Gain curve (G = A0 + A1·Elv + A2·Elv2)^^^ Observed in ^ confirmed ^ | ^ normalized Gain curve (G = A0 + A1·Elv + A2·Elv2)^^^ Observed in ^ confirmed ^ | ||
| - | |A0 = 0.954 |A1 = 3.19E-3 |A2 = -5.42E-5 | Jun 2015 | Jun 2015 | | + | |A0 = 0.981 |A1 = 1.08E-3 |A2 = -1.52E-5 | Jul 2024 | Jul 2024 | |
| - | |A0 = 0.955 |A1 = 3.1E-3 |A2 = -5.3E-5 | Jan 2014 | Jan 2014 | | + | |
| **Comments:** | **Comments:** | ||
| * Note that the system temperature at this frequency depends strongly on weather conditions! | * Note that the system temperature at this frequency depends strongly on weather conditions! | ||
| - | * Zenith tau values can range from 0.05 to 0.2. | + | * Zenith tau values can range from 0.05 to more than 0.2. |
| - | * * tau=0.12, Temp. from 10-15C, Hum. 98% to 70% (should be summer) | + | |
| + | The receiver delivers the data by default in four 2.5GHz-wide IF-subbands: | ||
| + | ^Band^Frequency Range^ | ||
| + | |4|18.0-20.5 GHz| | ||
| + | |3|19.9-22.4 GHz| | ||
| + | |2|21.6-24.1 GHz| | ||
| + | |1|23.5-26.0 GHz| | ||
| - | ==== Version description for OBSINP ==== | + | Additionally, there are several receiver versions (see below) which |
| + | allow to observe two 300 MHz-wide bands, e.g. for 22.25 GHz (i.e., the | ||
| + | water line) and 23.77 GHz (NH3 (1,1)-(3,3)). | ||
| - | ^ RX Name ^ Wavelength [cm] ^ Frequency (center) [GHz] ^ Nr. of Horns ^ | + | ==== Available receiver versions (for OBSINP) ==== |
| - | | **S14mm Double Beam RX ** | 1.3 | 18.0-26.0 (22.0) | 2 | | + | |
| - | | **Version:** | **Comment** ||| | + | |
| - | |1. Continuum (BW: 2 GHz) | Broad Band Continuum ||| | + | |
| - | | **Horn offsets** [arcsec]| Horn 1:-95.6,734.2; 2: 95.6,734.2 ||| | + | |
| + | ^Version^Description^Details^ | ||
| + | |dualpix_dualpol_cont_OPTOCBE|standard continuum backend with 4 basebands| 4x 2.5 GHz| | ||
| + | |dualpix_dualpol_hires_h2o_nh3 |spectroscopic mode with two basebands, centered at 22.25 and 23.77 GHz | bandwidth is 300 MHz per baseband| | ||
| + | |||
| + | |||
| + | **Below here: Information is currently updated.** | ||
| ==== Receiver Bands ==== | ==== Receiver Bands ==== | ||
| - | The receiver delivers the data in four 2.5GHz-wide IF-subbands: | + | |
| - | ^Band^Frequency Range^ | + | |
| - | |4|18.0-20.5 GHz| | + | |
| - | |3|19.9-22.4 GHz| | + | |
| - | |2|21.6-24.1 GHz| | + | |
| - | |1|23.5-26.0 GHz| | + | |
| ==== Channel assignment in the MBFITS data files ==== | ==== Channel assignment in the MBFITS data files ==== | ||
information_for_astronomers/rx/s14mm.1551616628.txt.gz · Last modified: 2019/03/03 13:37 by bwinkel
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