====== 2cm double beam secondary focus receiver (12000-18000 MHz) ====== This receiver 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^ | **S20mm** | K | 12.0-18.0 | dual-circular| 2 | Horn 1: Az: -525 arcsec, Elv: 63 arcsec,\\ Horn 2: Az: -762 arcsec, Elv: 63 arcsec| ==== Calibration Information ==== ^ Frequency [GHz] ^ Feed ^ Polarisation ^ Tcal [K] ^ Tsys [K] ^ Sensitivity [K/Jy] ^ SEFD [Jy] ^ Aperture Eff. [%] ^ TMB/S [K/Jy] ^ Main Beam Eff. [%] ^ FWHM [arcsec] ^ Last update ^ | 14.25 | 1 | LCP | 2.1 | 34 | 1.36 | 25 | 48 | 2.18 | 62 | 52.5 | Jun 2024 | | 14.25 | 1 | RCP | 2.1 | 34 | 1.36 | 25 | 48 | 2.18 | 62 | 52.5 | Jun 2024 | | 16.75 | 1 | LCP | 2.8 | 45 | 1.30 | 35 | 46 | 2.22 | 59 | 44.3 | Jun 2024 | | 16.75 | 1 | RCP | 2.8 | 45 | 1.30 | 35 | 46 | 2.22 | 59 | 44.3 | Jun 2024 | ^ normalized Gain curve (G = A0 + A1·Elv + A2·Elv2)^^^ Observed in ^ confirmed ^ |A0 = 0.9818 |A1 = 1.179E-3 |A2 = -1.906E-5 | Dec 2022 | --- | **Comments:** * Note that the system temperature at this frequency depends on weather conditions! * For technical reasons, no spectroscopic frequency-switch observations are possible! * Below 13 GHz, there is strong interference due to communication with satellites. ==== Available receiver versions (for OBSINP) ==== ^Version^Description^Details^ |continuum_5ghz|standard continuum backend with 2 basebands| 13.0-15.5 GHz & 15.5-18.0 GHz| |cont_spec_5ghz|includes the WFFTS with 2x2x64k channels | 13.0-15.5 GHz & 15.5-18.0 GHz| **Below here: Information is currently updated.** ==== Version description for OBSINP ==== ^ RX Name ^ Wavelength [cm] ^ Frequency (center) [GHz] ^ Nr. of Horns ^ | **S20mm Double Beam RX ** | 2.0 | 12.0-18.0 (15.0) | 2 | | **Version:** | **Comment** ||| |1. Continuum (BW: 2 GHz) | Broad Band Continuum ||| | **Horn offsets** (Azi, Elv, from center of SFK)| Horn 1: -525" ; 63" -- Horn 2: -762" ; 63" ||| |relative offset of horn 2 from 1 (Azi, Elv)| -237" ; 0"||| ==== Receiver Bands ==== The receiver delivers the data in two 2.5GHz-wide IF-subbands, which can be shifted in to cover the 12-18 GHz range. ==== Spectroscopy modes and resolution ==== === Low-res mode (2 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.** **TODO: update numbers!** ^ 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 (?? basebands) === **TODO: update numbers!** ^ 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\\ 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 measurements ==== === Mar 2020 === == Tcal and Tsys == {{:information_for_astronomers:rx:effbg_s20mm_kuband_2020mar27_ngc7027_wrv_tcal_from_specpointing_using_tau_spec.png?365 |}} {{:information_for_astronomers:rx:effbg_s20mm_kuband_2020mar27_ngc7027_wrv_tsys0_from_specpointing_using_tau_spec.png?365 |}} == Opacity and Tebb (WVR+AATM) == {{:information_for_astronomers:rx:effbg_s20mm_kuband_2020mar27_ngc7027_wrv_tau_from_specpointing_using_tau_spec.png?365 |}} {{:information_for_astronomers:rx:effbg_s20mm_kuband_2020mar27_ngc7027_wrv_tebb_from_specpointing_using_tau_spec.png?365 |}} == T0 == {{:information_for_astronomers:rx:effbg_s20mm_kuband_2020mar27_ngc7027_wrv_t0_from_specpointing_using_tau_spec.png?365 |}} == Antenna model == {{:information_for_astronomers:rx:effbg_s20mm_kuband_2020mar27_ngc7027_wrv_taper_from_specpointing.png?365 |}} {{:information_for_astronomers:rx:effbg_s20mm_kuband_2020mar27_ngc7027_wrv_hpbw_from_specpointing.png?365 |}} {{:information_for_astronomers:rx:effbg_s20mm_kuband_2020mar27_ngc7027_wrv_gamma_from_specpointing.png?365 |}} {{:information_for_astronomers:rx:effbg_s20mm_kuband_2020mar27_ngc7027_wrv_gammamb_from_specpointing.png?365 |}} {{:information_for_astronomers:rx:effbg_s20mm_kuband_2020mar27_ngc7027_wrv_eta_from_specpointing.png?365 |}} {{:information_for_astronomers:rx:effbg_s20mm_kuband_2020mar27_ngc7027_wrv_etamb_from_specpointing.png?365 |}} === Nov 2019 === == Tcal and Tsys == {{:information_for_astronomers:rx:EFFBG_S20mm_Cband_2019Nov22_3C286_aatm_L_tcal_from_specpointing_using_tau_spec.png?365 |}} {{:information_for_astronomers:rx:EFFBG_S20mm_Cband_2019Nov22_3C286_aatm_R_tcal_from_specpointing_using_tau_spec.png?365 |}}\\ {{:information_for_astronomers:rx:EFFBG_S20mm_Cband_2019Nov22_3C286_aatm_L_tsys0_from_specpointing_using_tau_spec.png?365 |}} {{:information_for_astronomers:rx:EFFBG_S20mm_Cband_2019Nov22_3C286_aatm_R_tsys0_from_specpointing_using_tau_spec.png?365 |}} == Opacity and Tebb (WVR+AATM) == {{:information_for_astronomers:rx:EFFBG_S20mm_Cband_2019Nov22_3C286_aatm_L_tau_from_specpointing_using_tau_spec.png?365 |}} {{:information_for_astronomers:rx:EFFBG_S20mm_Cband_2019Nov22_3C286_aatm_R_tau_from_specpointing_using_tau_spec.png?365 |}}\\ {{:information_for_astronomers:rx:EFFBG_S20mm_Cband_2019Nov22_3C286_aatm_L_tebb_from_specpointing_using_tau_spec.png?365 |}} {{:information_for_astronomers:rx:EFFBG_S20mm_Cband_2019Nov22_3C286_aatm_R_tebb_from_specpointing_using_tau_spec.png?365 |}} == T0 == {{:information_for_astronomers:rx:EFFBG_S20mm_Cband_2019Nov22_3C286_aatm_L_t0_from_specpointing_using_tau_spec.png?365 |}} {{:information_for_astronomers:rx:EFFBG_S20mm_Cband_2019Nov22_3C286_aatm_R_t0_from_specpointing_using_tau_spec.png?365 |}} == Antenna model == {{:information_for_astronomers:rx:EFFBG_S20mm_Cband_2019Nov22_3C286_aatm_L_taper_from_specpointing.png?365 |}} {{:information_for_astronomers:rx:EFFBG_S20mm_Cband_2019Nov22_3C286_aatm_R_taper_from_specpointing.png?365 |}}\\ {{:information_for_astronomers:rx:EFFBG_S20mm_Cband_2019Nov22_3C286_aatm_L_hpbw_from_specpointing.png?365 |}} {{:information_for_astronomers:rx:EFFBG_S20mm_Cband_2019Nov22_3C286_aatm_R_hpbw_from_specpointing.png?365 |}} {{:information_for_astronomers:rx:EFFBG_S20mm_Cband_2019Nov22_3C286_aatm_L_gamma_from_specpointing.png?365 |}}\\ {{:information_for_astronomers:rx:EFFBG_S20mm_Cband_2019Nov22_3C286_aatm_R_gamma_from_specpointing.png?365 |}} {{:information_for_astronomers:rx:EFFBG_S20mm_Cband_2019Nov22_3C286_aatm_L_gammamb_from_specpointing.png?365 |}} {{:information_for_astronomers:rx:EFFBG_S20mm_Cband_2019Nov22_3C286_aatm_R_gammamb_from_specpointing.png?365 |}} {{:information_for_astronomers:rx:EFFBG_S20mm_Cband_2019Nov22_3C286_aatm_L_eta_from_specpointing.png?365 |}} {{:information_for_astronomers:rx:EFFBG_S20mm_Cband_2019Nov22_3C286_aatm_R_eta_from_specpointing.png?365 |}}\\ {{:information_for_astronomers:rx:EFFBG_S20mm_Cband_2019Nov22_3C286_aatm_L_etamb_from_specpointing.png?365 |}} {{:information_for_astronomers:rx:EFFBG_S20mm_Cband_2019Nov22_3C286_aatm_R_etamb_from_specpointing.png?365 |}}