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information_for_astronomers:rx:s45mm [2015/02/17 11:16]
ubach created
information_for_astronomers:rx:s45mm [2020/09/29 08:17] (current)
akraus
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 ====== 4.5cm broad band C/X secondary focus receiver (4000-9300 MHz) ====== ====== 4.5cm broad band C/X secondary focus receiver (4000-9300 MHz) ======
  
-To be installed soon.+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):​ 
 + 
 +^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. [%] ^ HPBW [arcsec] ^ Last update ^
 +|5.250 |1+2 |lin |3.1 |35 |1.60 |22 |56 |2.0 |71 |140 |Oct 2019|
 +|6.750 |1+2 |lin |4.5 |37 |1.40 |26 |49 |1.6 |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 |1.8 |65 |146 |Oct 2019|
 +
 +
 +^ 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| Oct 2019 |
 +
 +**Comments:​**
 +  * The gain curve was corrected for opacity (though it is small, < 0.02 throughout the band).
  
  
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 ==== 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 |
 +
 +N_Chan ... number of spectral channels\\
 +f_center ... 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.1424168181.txt.gz · Last modified: 2015/02/17 11:16 by ubach