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--- information_for_astronomers:rx:s14mm [2014/01/16 12:54]
ubach [Version description for OBSINP]
+++ information_for_astronomers:rx:s14mm [2024/07/10 16:23] (current)
akraus
@@ Line 1: / Line 1: @@
 ====== 1.3cm double beam secondary focus receiver (18000-26000 MHz) ======
-** The receiver will be installed soon into the telescope. It is not yet available! **
+This is a two horn system especially for continuum, spectroscopy and VLBI observations.
-This is a two horn system for continuum, spectroscopy and VLBI observations. \\
+==== Overview ====
+^ 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 ====
 ^ 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 ^
-| | | | | | | | | | | | |
+| 19.25 | 1/2 | LCP/RCP | 13.1 | 47 | 1.09 | 43 | 38 | 1.56 | 67 | 40.4 | Jul 2024 |
+| 21.15 | 1/2 | LCP/RCP | 9.2 | 67 | 1.05 | 64 | 37 | 1.74 | 61 | 37.8 | Jul 2024 |
+| 22.85 | 1/2 | LCP/RCP | 9.0 | 74 | 1.03 | 72 | 36 | 1.41 | 79 | 36.8 | Jul 2024 |
+| 24.75 | 1/2 | LCP/RCP | 8.0 | 72 | 1.01 | 71 | 36 | 1.57 | 71 | 34.5 | Jul 2024 |
+| 22.25 | 1/2 | LCP/RCP | 8.4 | 72 | 1.05 | 71 | 36 | 1.57 | 71 | 36.8 | Jul 2024 |
+| 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 ^
-|A0 = |A1 = |A2 =  | | |
+|A0 = 0.981 |A1 = 1.08E-3 |A2 = -1.52E-5 | Jul 2024 | Jul 2024 |
 **Comments:**
    * 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.
+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)).
+==== Available receiver versions (for OBSINP) ====
+^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 ====
-^ RX Name ^ Wavelength [cm] ^ Frequency (center) [GHz] ^ Nr. of Horns ^
-| **S13mm 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 |||
@@ Line 40: / Line 63: @@
 TP: total power
-^ 2cm SFK single horn receiver ^^^^
+^ 1.3cm SFK single horn receiver ^^^^
 ^ Channel ^ IF ^ Pol. ^ Comment ^
 |  1  |    BB     |     LCP    | TP A  |
@@ Line 46: / Line 69: @@
 ==== Spectroscopy modes and resolution ====
+=== Low-res mode (4 basebands for each of 2 feeds and 2 polarizations) ===
+**Note, that due to technical reasons the LSR correction has to be applied via software (regridding). This will decrease the effective spectral resolution to some degree.**
 ^   BW ^ nchan ^    nu ^     Df ^     Dv ^     dv ^
 ^  MHz ^       ^   MHz ^    kHz ^   km/s ^   km/s ^
-|  100 | 32768 | 22000 |    3.1 |  0.042 |  0.048 |
+| 2500 | 16384 | 18000 |  152.6 |  2.541 |  2.948 |
-|  100 | 32768 | 23000 |    3.1 |  0.040 |  0.046 |
+| 2500 | 16384 | 20000 |  152.6 |  2.287 |  2.653 |
-|  100 | 32768 | 24000 |    3.1 |  0.038 |  0.044 |
+| 2500 | 16384 | 22000 |  152.6 |  2.079 |  2.412 |
-|  500 | 32768 | 22000 |   15.3 |  0.208 |  0.241 |
+| 2500 | 16384 | 24000 |  152.6 |  1.906 |  2.211 |
-|  500 | 32768 | 23000 |   15.3 |  0.199 |  0.231 |
+| 2500 | 16384 | 26000 |  152.6 |  1.759 |  2.041 |
-|  500 | 32768 | 24000 |   15.3 |  0.191 |  0.221 |
+| 2500 | 32768 | 18000 |   76.3 |  1.271 |  1.474 |
+| 2500 | 32768 | 20000 |   76.3 |  1.144 |  1.327 |
+| 2500 | 32768 | 22000 |   76.3 |  1.040 |  1.206 |
+| 2500 | 32768 | 24000 |   76.3 |  0.953 |  1.105 |
+| 2500 | 32768 | 26000 |   76.3 |  0.880 |  1.020 |
+| 2500 | 65536 | 18000 |   38.1 |  0.635 |  0.737 |
+| 2500 | 65536 | 20000 |   38.1 |  0.572 |  0.663 |
+| 2500 | 65536 | 22000 |   38.1 |  0.520 |  0.603 |
+| 2500 | 65536 | 24000 |   38.1 |  0.477 |  0.553 |
+| 2500 | 65536 | 26000 |   38.1 |  0.440 |  0.510 |
+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)
+=== Hi-res mode (28 basebands for 1 feed and 1 polarization only) ===
+^   BW ^ nchan ^    nu ^     Df ^     Dv ^     dv ^
+^  MHz ^       ^   MHz ^    kHz ^   km/s ^   km/s ^
+|  300 | 16384 | 18000 |   18.3 |  0.305 |  0.354 |
+|  300 | 16384 | 20000 |   18.3 |  0.274 |  0.318 |
+|  300 | 16384 | 22000 |   18.3 |  0.250 |  0.289 |
+|  300 | 16384 | 24000 |   18.3 |  0.229 |  0.265 |
+|  300 | 16384 | 26000 |   18.3 |  0.211 |  0.245 |
+|  300 | 32768 | 18000 |    9.2 |  0.152 |  0.177 |
+|  300 | 32768 | 20000 |    9.2 |  0.137 |  0.159 |
+|  300 | 32768 | 22000 |    9.2 |  0.125 |  0.145 |
+|  300 | 32768 | 24000 |    9.2 |  0.114 |  0.133 |
+|  300 | 32768 | 26000 |    9.2 |  0.106 |  0.122 |
+|  300 | 65536 | 18000 |    4.6 |  0.076 |  0.088 |
+|  300 | 65536 | 20000 |    4.6 |  0.069 |  0.080 |
+|  300 | 65536 | 22000 |    4.6 |  0.062 |  0.072 |
+|  300 | 65536 | 24000 |    4.6 |  0.057 |  0.066 |
+|  300 | 65536 | 26000 |    4.6 |  0.053 |  0.061 |
 BW    ... band width\\
@@ Line 63: / Line 122: @@
 ==== Tcal measurements ====
+=== February 2019 ===
+== Tcal and Tsys ==
+{{:information_for_astronomers:rx:EFFBG_S14mm_Kband_2019Feb23_NGC7027_aatm_tcal_from_specpointing_using_tau_spec.png?365 |}}
+{{:information_for_astronomers:rx:EFFBG_S14mm_Kband_2019Feb23_NGC7027_aatm_tsys0_from_specpointing_using_tau_spec.png?365 |}}
+== Opacity and Tebb (WVR+AATM) ==
+{{:information_for_astronomers:rx:EFFBG_S14mm_Kband_2019Feb23_NGC7027_aatm_tau_from_specpointing_using_tau_spec.png?365 |}}
+{{:information_for_astronomers:rx:EFFBG_S14mm_Kband_2019Feb23_NGC7027_aatm_tebb_from_specpointing_using_tau_spec.png?365 |}}
+== T0 ==
+{{:information_for_astronomers:rx:EFFBG_S14mm_Kband_2019Feb23_NGC7027_aatm_t0_from_specpointing_using_tau_spec.png?365 |}}
+=== April 2014 ===
+Note, that in April the Tcal was changed in the receiver. Gaps in the curves are entirely due to measurement uncertainties. T0 and Tsys were deduced from spectroscopic skydip measurements and are subject to fitting errors caused by the low signal-to-noise ratio in the spectral bins.
+== Tcal and Tsys ==
+{{:information_for_astronomers:rx:s14mm_apr23_3c147_tcal_from_specpointing_using_tau_spec.png?365 |}}
+{{:information_for_astronomers:rx:s14mm_apr23_3c147_tsys0_from_specpointing_using_tau_spec.png?365 |}}
+== Opacity and T0 ==
+{{:information_for_astronomers:rx:s14mm_apr23_3c147_tau_from_specpointing_using_tau_spec.png?365 |}}
+{{:information_for_astronomers:rx:s14mm_apr23_3c147_t0_from_specpointing_using_tau_spec.png?365 |}}
+=== Januar 2014 ===
+== Tcal and Tsys ==
+{{:information_for_astronomers:rx:s14mm_jan14_ngc7027b_tcal_from_specpointing_using_tau_spec.png?365 |}}
+{{:information_for_astronomers:rx:s14mm_jan14_ngc7027b_tsys0_from_specpointing_using_tau_spec.png?365 |}}
+== Opacity and T0 ==
+{{:information_for_astronomers:rx:s14mm_jan14_ngc7027b_tau_from_specpointing_using_tau_spec.png?365 |}}
+{{:information_for_astronomers:rx:s14mm_jan14_ngc7027b_t0_from_specpointing_using_tau_spec.png?365 |}}
+== Antenna model ==
+{{:information_for_astronomers:rx:EFFBG_S14mm_Kband_2019Feb23_NGC7027_aatm_taper_from_specpointing.png?365 |}}
+{{:information_for_astronomers:rx:EFFBG_S14mm_Kband_2019Feb23_NGC7027_aatm_hpbw_from_specpointing.png?365 |}}
+{{:information_for_astronomers:rx:EFFBG_S14mm_Kband_2019Feb23_NGC7027_aatm_gamma_from_specpointing.png?365 |}}
+{{:information_for_astronomers:rx:EFFBG_S14mm_Kband_2019Feb23_NGC7027_aatm_gammamb_from_specpointing.png?365 |}}
+{{:information_for_astronomers:rx:EFFBG_S14mm_Kband_2019Feb23_NGC7027_aatm_eta_from_specpointing.png?365 |}}
+{{:information_for_astronomers:rx:EFFBG_S14mm_Kband_2019Feb23_NGC7027_aatm_etamb_from_specpointing.png?365 |}}
-to be done

Effelsberg 100m Teleskop

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