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--- information_for_astronomers:rx:s14mm [2014/01/16 12:54]
ubach created
+++ information_for_astronomers:rx:s14mm [2020/01/27 10:48] (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 receiver replaced the old 1.3cm secondary focus system. However, some modes, especially
+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. \\
+This is a two horn system for continuum, spectroscopy and VLBI observations. The system is currently tested and all values are preliminary. \\
+**Note, that for technical reasons, no spectroscopic frequency-switch observations are possible!**
 ==== 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 | 17 | 47 | 1.09 | 43 | 38 | 1.56 | 67 | 40 | Jan 2020 |
+| 21.15 | 1/2 | LCP/RCP | 14 | 67 | 1.05 | 64 | 37 | 1.74 | 61 | 37 | Jan 2020 |
+| 22.35 | 1 | LCP | 9.1 | 70 | 1.03 | 68 | 36 | 1.6 | 64 | 39.1 | Jun 2015 |
+| 22.35 | 1 | RCP | 9.6 | 71 | 1.06 | 67 | 37 | 1.6 | 67 | 39.3 | Jun 2015 |
+| 22.85 | 1/2 | LCP/RCP | 9.2 | 74 | 1.03 | 72 | 36 | 1.41 | 79 | 36 | Jan 2020 |
+| 24.75 | 1/2 | LCP/RCP | 8.0 | 72 | 1.01 | 71 | 36 | 1.57 | 71 | 34 | Jan 2020 |
 ^ normalized Gain curve (G = A0 + A1·Elv + A2·Elv2)^^^ Observed in ^ confirmed ^
-|A0 = |A1 = |A2 =  | | |
+|A0 = 0.954 |A1 = 3.19E-3 |A2 = -5.42E-5 | Jun 2015 | Jun 2015 |
 **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.
 ==== Version description for OBSINP ====
 ^ RX Name ^ Wavelength [cm] ^ Frequency (center) [GHz] ^ Nr. of Horns ^
-| **S13mm Double Beam RX ** | 1.3 | 18.0-26.0 (22.0) | 2 |
+| **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:-95.6,735; 2: 95.6,734.2 |||
+| **Horn offsets** [arcsec]| Horn 1:-95.6,734.2; 2: 95.6,734.2 |||
+==== 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 ====
@@ Line 40: / Line 57: @@
 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 63: @@
 ==== 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 ^
+| 2500 | 16384 | 18000 |  152.6 |  2.541 |  2.948 |
+| 2500 | 16384 | 20000 |  152.6 |  2.287 |  2.653 |
+| 2500 | 16384 | 22000 |  152.6 |  2.079 |  2.412 |
+| 2500 | 16384 | 24000 |  152.6 |  1.906 |  2.211 |
+| 2500 | 16384 | 26000 |  152.6 |  1.759 |  2.041 |
+| 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 ^
-|  100 | 32768 | 22000 |    3.1 |  0.042 |  0.048 |
+|  300 | 16384 | 18000 |   18.3 |  0.305 |  0.354 |
-|  100 | 32768 | 23000 |    3.1 |  0.040 |  0.046 |
+|  300 | 16384 | 20000 |   18.3 |  0.274 |  0.318 |
-|  100 | 32768 | 24000 |    3.1 |  0.038 |  0.044 |
+|  300 | 16384 | 22000 |   18.3 |  0.250 |  0.289 |
-|  500 | 32768 | 22000 |   15.3 |  0.208 |  0.241 |
+|  300 | 16384 | 24000 |   18.3 |  0.229 |  0.265 |
-|  500 | 32768 | 23000 |   15.3 |  0.199 |  0.231 |
+|  300 | 16384 | 26000 |   18.3 |  0.211 |  0.245 |
-|  500 | 32768 | 24000 |   15.3 |  0.191 |  0.221 |
+|  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 116: @@
 ==== 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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