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information_for_astronomers:rx:p19mm
This is an old revision of the document!
Table of Contents
1.9-cm primary focus receiver (13500-18700 MHz)
This is a 1-channel broad-band system used for spectroscopy. It has a linearly polarized feed. So far, only few test observations could be made to measure the variation of its parameters with frequency.
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 13.75 | B | linear | 1.5 | 35 | 1.1 | 32 | 39 | 1.8 | 61 | 60.3 | Mar 2001 |
| 15.42 | B | linear | 1.7 | 37 | 1.2 | 32 | 41 | 1.8 | 64 | 53.5 | Apr 2003 |
| 18.00 | B | linear | 1.2 | 46 | 0.90 | 51 | 32 | 1.7 | 53 | 46.5 | Mar 2001 |
| normalized Gain curve (G = A0 + A1·Elv + A2·Elv2) | Observed in | confirmed | ||
|---|---|---|---|---|
| A0=0.95912 | A1= 2.5000E-3 | A2=-3.8149E-5 | Apr 2003 | |
Comments:
- The values at 15.4 GHz could be derived from cross-scans during spectroscopic observations. Thanks to N. Nagar!
- Values at 18 GHz are a bit uncertain.
Version description for OBSINP
| RX Name | Wavelength [cm] | Frequency (center) [GHz] | Nr. of Horns |
|---|---|---|---|
| P19mm 4-Box (13.5-18.7 GHz) | 2.2-1.6 | 13.5-18.7 | 1 |
| Version: | Comment | ||
| 1. Cont./Line: 13,3-16,75 GHz (BW: 500 MHz) | VLBA IF Continuum and spectroscopy version, 1st freq. range | ||
| 2. Cont./Line: 16,55-18,5 GHz (BW: 500 MHz) | VLBA IF Continuum and spectroscopy version, 2nd freq. range | ||
| 3. Cont./Line: 13,5-16,95 GHz (BW: 100 MHz) | narrow band IF Continuum and spectroscopy version, 1st freq. range | ||
| 4. Cont./Line: 16,3-18,5 GHz (BW: 100 MHz) | narrow band IF Continuum and spectroscopy version, 2nd freq. range | ||
| Horn offsets [arcsec] | -904.0, 1077.4 | ||
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
optical: optical fibre with 4 GHz of band width
BW: band width
TP: total power
| 1.9cm PFK (Multi-RX-Box I) | |||
|---|---|---|---|
| Channel | IF | Pol. | Comment |
| 1 | SB | linear | TP A |
| 2 | BB | linear | TP A |
| 3 | VLBA | linear | TP A |
Tcal and Tsys measurements
TODO
information_for_astronomers/rx/p19mm.1363093765.txt.gz · Last modified: 2013/09/30 12:09 (external edit)
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