9mm secondary focus receiver (30000-34000 MHz)

This is a 7-beam system with linear and circular polarized feeds. It is usable for continuum observations and - in a limited way - for pulsar 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. [%] FWHM [arcsec] Last update
32.00 1 linear 7.6 63 0.75 84 32 1.9 38 24.5 Apr 2009
32.00 2 linear 5.5 57 0.75 76 32 1.9 38 24.5 Apr 2009
32.00 9 LCP 8.8 66 0.75 88 32 1.9 38 24.5 Apr 2009
32.00 12 LCP 5.3 62 0.75 83 32 1.9 38 24.5 Apr 2009
normalized Gain curve (G = A0 + A1·Elv + A2·Elv2) Observed in confirmed
A0 = 0.91612 A1 = 4.9463e-03A2 = -7.1292e-05Feb 2007Aug 2014

Comments:

  • The gain curve was corrected for opacity.
  • If no other information about the opacity is available a typical zenith tau value of about 0.05 for good weather conditions can be assumed.

Version description for OBSINP

RX Name Wavelength [cm] Frequency (center) [GHz] Nr. of Horns
S9mm 7-beam 0.9 30.0-34.0 (32.0) 7
Version: Comment
1. Continuum 4Ch (BW: 4 GHz) Broad Band Continuum using the central 3 horns (1,6,7)
1. Continuum 12Ch (BW: 4 GHz) using the internal 9mm backend with all 7 horns
Horn offsets [arcsec] Horn 1: (2.4,65.4), 2:(-37.9,25.2), 3:(42.6,25.2), 4:(-37.9,105.7), 5:(42.6,105.7), 6:(-77.7,65.4), 7:(83.9,65.4)

Channel assignment in the MBFITS data files

Note that the narrow line and VLBA IF channels are usually only available when the specific line version of the receiver was selected. In addition for most receivers with narrow line channels the cables at the patch board need to be connected by the receiver group.

To select different channel numbers in OBSINP, the online plot, or the toolbox the numbers have to be specified like c(1)+c(2) to add channel 1 and 2. E.g. channel 1 and 2 contain the LCP and RCP broadband channels, then "OnlPlot pen='c(1)+c(2)'" or "toolbox use='c(1)+c(2)'" will select these channels. In OBSINP the pen can be directly specified in the receiver selection menu.

Abbreviations:
SB: narrow band channel (Schmalband-Kanal), 100 MHz band width
BB: digital broad band channel (Breitband-Kanal), band width varies for different receivers
VLBA: VLBA IF, 500 MHz band width
BW: band width
TP: total power

9mm SFK multi horn receiver, 4 Channel version, 7 horns
Channel IF Pol. Comment
1 BB linear Horn 1, horizontal pol.
2 BB linear Horn 1, vertical pol.
3 BB LCP Horn 6, TP A
4 BB LCP Horn 7, TP B

Tcal and Tsys measurements

TODO

 
information_for_astronomers/rx/s9mm.txt · Last modified: 2017/09/04 11:38 by akraus     Back to top