- Information for Astronomers
- General Topics*
- Gruppen Seiten*
* Log-in required
User Tools
Sidebar
information_for_astronomers:rx:s9mm
This is an old revision of the document!
Table of Contents
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-03 | A2 = -7.1292e-05 | Feb 2007 | Aug 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(?) |
| 2 | BB | linear | Horn 1, vertical(?) |
| 3 | BB | LCP | Horn 6, TP A |
| 4 | BB | LCP | Horn 7, TP B |
Tcal and Tsys measurements
TODO
information_for_astronomers/rx/s9mm.1502105020.txt.gz · Last modified: 2017/08/07 13:23 by ubach
Except where otherwise noted, content on this wiki is licensed under the following license: CC Attribution-Noncommercial-Share Alike 4.0 International
