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information_for_astronomers:rx:s45mm [2017/01/09 14:54]
akraus
information_for_astronomers:rx:s45mm [2020/09/29 08:16]
akraus
Line 1: Line 1:
 ====== 4.5cm broad band C/X secondary focus receiver (4000-9300 MHz) ====== ====== 4.5cm broad band C/X secondary focus receiver (4000-9300 MHz) ======
  
-This is a broad-band receiver with two linear polarizations. The system is +This is a broad-band receiver with two orthogonal ​linear polarizations ​(at a 45°-angle with the horizon). The receiver (in most setups simultaneously) delivers 4 basebands (each with two polarizations):​ 
-still under test, but could be used on a "​shared-risk"​ basis.+ 
 +^Baseband^Center Frequency^Bandwidth^Comment^ 
 +|1|5.250 GHz| 2500 MHz| beware of strong RFI at frequencies < 4.5 GHz!| 
 +|2|6.750 GHz| 2500 MHz|  | 
 +|3|6.668 GHz| 200 MHz| for methanol observations| 
 +|4|4.829 GHz| 200 MHz| for formaldehyde observations|
  
 ==== 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. [%] ^ HPBW [arcsec] ^ Last update ^ 
-|6.668 ||lin |4.5 |27 |1.54 |23 |54 |2.|63 |102 |Nov 2016+|5.250 |1+2 |lin |3.1 |35 |1.60 |22 |56 |2.0 |71 |140 |Oct 2019| 
-|6.668 ||lin |4.1 |28 |1.54 |26 |54 |2.|63 |102 |Nov 2016|+|6.750 |1+2 |lin |4.5 |37 |1.40 |26 |49 |1.|58 |105 |Oct 2019
 +|6.668 |1+2 |lin |3.6 |34 |1.39 |24 |49 |1.7 |60 |109 |Oct 2019| 
 +|4.829 |1+2 |lin |2.8 |42 |1.59 |26 |56 |1.|65 |146 |Oct 2019| 
  
 ^ 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 = 0.9928|A1 = 4.212E-4|A2 = -6.158E-6|Jun 2016|  |+|A0 = 0.9928|A1 = 4.212E-4|A2 = -6.158E-6|Jun 2016| Oct 2019 |
  
 **Comments:​** **Comments:​**
Line 23: Line 31:
 ==== Channel assignment in the MBFITS data files ==== ==== Channel assignment in the MBFITS data files ====
  
 +==== Spectroscopy modes and resolution ====
 +
 +^Baseband^f_center^Bandwidth^N_Chan^Df^Dv^dv^
 +^ ^ GHZ ^MHz ^ ^kHz^km/​s^km/​s^
 +|1|5.25|2500|65536|38.1|2.18|2.53|
 +|2|6.75|2500|65536|38.1|1.69|1.96|
 +|3|6.668|200|65536|3.05|0.137|0.159|
 +|4|4.829|200|65536|3.05|0.189|0.219 |
 +
 +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 and Tsys measurements ==== ==== Tcal and Tsys measurements ====
 +
  
information_for_astronomers/rx/s45mm.txt · Last modified: 2020/09/29 08:17 by akraus