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information_for_astronomers:rx:s45mm

4.5cm broad band C/X secondary focus receiver (4000-9300 MHz)

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):

BasebandCenter FrequencyBandwidthComment
15.250 GHz 2500 MHz beware of strong RFI at frequencies < 4.5 GHz!
26.750 GHz 2500 MHz
36.668 GHz 200 MHz for methanol observations
44.829 GHz 200 MHz for formaldehyde observations

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 = 0.9928A1 = 4.212E-4A2 = -6.158E-6Jun 2016 Oct 2019

Comments:

  • The gain curve was corrected for opacity (though it is small, < 0.02 throughout the band).

Version description for OBSINP

Channel assignment in the MBFITS data files

Spectroscopy modes and resolution

Basebandf_centerBandwidthN_ChanDfDvdv
GHZ MHz kHzkm/skm/s
15.2525006553638.12.182.53
26.7525006553638.11.691.96
36.668200655363.050.1370.159
44.829200655363.050.1890.219

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

information_for_astronomers/rx/s45mm.txt · Last modified: 2020/09/29 08:17 by akraus