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--- information_for_astronomers:rx:s7mm_db [2019/12/06 10:28]
akraus
+++ information_for_astronomers:rx:s7mm_db [2021/10/21 20:58]
akraus
@@ Line 1: / Line 1: @@
 ====== 7mm secondary focus receiver (33500-50000 MHz) ======
- This is a 4-channel two horn system for continuum, spectroscopy and VLBI observations. This is a new receiver currently in commissioning and was installed in March 2018. More details will follow.\\
+This is a 4-channel two horn system for continuum, spectroscopy and VLBI observations.\\
+Attention: When frequencies lower than 35 GHz are selected, the receiver operates in
+double sideband mode for some parts of the observed bandpass. Please contact staff for
+advice.
 ==== Calibration Information ====
-This are preliminary results from first tests and can easily be off by 10 or 15 %.
 ^ 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 ^
-|35.75 |A |LCP |7.5 |77 |0.76 |102 |26 |1.6 |47 |24.4 |May 2018 |
+|36.25 |A/B |LCP/RCP |10.6 |124 |0.78 |160 |27 |1.7 |44 |23.0 |Oct 2021 |
-|35.75 |B |RCP |6.9 |83 |0.75 |112 |26 |1.6 |47 |24.5 |May 2018 |
+|38.75 |A/B |LCP/RCP |15.0 |144 |0.73 |197 |26 |1.8 |40 |21.2 |Oct 2021 |
-|38.25 |A |LCP |9.3 |90 |0.62 |145 |22 |1.6 |38 |22.5 |May 2018 |
+|41.25 |A/B |LCP/RCP |12.2 |110 |0.64 |171 |23 |1.7 |38 |20.7 |Oct 2021 |
-|38.25 |B |RCP |9.1 |94 |0.66 |143 |23 |1.6 |40 |22.6 |May 2018 |
+|43.75 |A/B |LCP/RCP |10.8 |136 |0.60 |228 |21 |1.6 |36 |19.7 |Oct 2021 |
-|42.75 |A |LCP |9.5 |84 |0.76 |110 |26 |1.5 |50 |20.9 |May 2018 |
-|42.75 |B |RCP |8.7 |85 |0.77 |111 |27 |1.5 |50 |21.1 |May 2018 |
 |44.1 (narrow band)|A+B |LCP+RCP |13 |100 |0.66 |140 |23 |1.67 |40 |19.5 |Dec 2019|
-|45.25 |A |LCP |8.5 |99 |0.63 |156 |22 |1.5 |42 |19.7 |May 2018 |
+|46.25 |A/B |LCP/RCP |10.2 |125 |0.59 |214 |20 |1.6 |36 |19.1 |Oct 2021 |
-|45.25 |B |RCP |8.2 |103 |0.65 |159 |22 |1.5 |47 |19.8 |May 2018 |
+|48.75 |A/B |LCP/RCP |10.0 |187 |0.51 |369 |18 |1.6 |32 |18.1 |Oct 2021 |
 ^ normalized Gain curve (G = A0 + A1·Elv + A2·Elv2)^^^ Observed in ^ confirmed ^
-|A0 = 0.897 |A1 = 5.93E-3|A2 = -8.52E-05|Below 40 GHz, Aug 2018 | |
+|A0 = 0.8349 |A1 = 8.312E-3|A2 = -1.046E-04|Below 40 GHz, Oct 2021 | |
-|A0 = 0.897 |A1 = 7.85E-3|A2 = -1.5E-04|Above 40 GHz, May 2018 | |
+|A0 = 0.7852 |A1 = 1.126E-2|A2 = -1.475E-04|40-45 GHz, Oct 2021 | |
+|A0 = 0.7608 |A1 = 1.487E-2|A2 = -2.310E-04|45-50 GHz, Oct 2021 | |
 **Comments:**
-   * The new gain curves were corrected for opacity.
+   * **Please note, that Tsys and SEFD are given for zenith. For sensitivity calculations, please take the atmosphere's opacity into account!**
-   * Opacity correction was done with a zenith opacity of 0.06-0.08. Typical zenith opacities under good weather conditions are around 0.07 to 0.1 at 42 GHz.
+   * The data was corrected for sky opacity with observations from the WVR. Typical zenith opacities under good weather conditions are around 0.07 to 0.1 at 42 GHz.
    * For informations about the old parameters please contact Uwe Bach (ubach_at_mpifr.de).
@@ Line 51: / Line 51: @@
 ^ 7mm SFK dual horn receiver ^^^^
 ^ Channel ^ IF ^ Pol. ^ Comment ^
 |  1  |    2.5 GHz    |     LCP    | TP A, horn 1  |
 |  2  |    2.5 GHz    |     RCP    | TP B, horn 1  |
 |  3  |    2.5 GHz    |     LCP    | TP A, horn 2  |
 |  4  |    2.5 GHz    |     RCP    | TP B, horn 2  |
 ==== Spectroscopy modes and resolution ====

Effelsberg 100m Teleskop

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