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information_for_astronomers:rx:s14mm
This is an old revision of the document!
Table of Contents
1.3cm double beam secondary focus receiver (18000-26000 MHz)
The receiver will be installed soon into the telescope. It is not yet available!
This is a two horn system for continuum, spectroscopy and VLBI 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| normalized Gain curve (G = A0 + A1·Elv + A2·Elv2) | Observed in | confirmed | ||
|---|---|---|---|---|
| A0 = | A1 = | A2 = | ||
Comments:
- Note that the system temperature at this frequency depends strongly on weather conditions!
- Zenith tau values can range from 0.05 to 0.2.
Version description for OBSINP
| RX Name | Wavelength [cm] | Frequency (center) [GHz] | Nr. of Horns |
|---|---|---|---|
| S13mm Double Beam RX | 1.3 | 18.0-26.0 (22.0) | 2 |
| Version: | Comment | ||
| 1. Continuum (BW: 2 GHz) | Broad Band Continuum | ||
| Horn offsets [arcsec] | Horn 1:-95.6,735; 2: 95.6,734.2 | ||
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
| 2cm SFK single horn receiver | |||
|---|---|---|---|
| Channel | IF | Pol. | Comment |
| 1 | BB | LCP | TP A |
| 2 | BB | RCP | TP B |
Spectroscopy modes and resolution
| BW | nchan | nu | Df | Dv | dv |
|---|---|---|---|---|---|
| MHz | MHz | kHz | km/s | km/s | |
| 100 | 32768 | 22000 | 3.1 | 0.042 | 0.048 |
| 100 | 32768 | 23000 | 3.1 | 0.040 | 0.046 |
| 100 | 32768 | 24000 | 3.1 | 0.038 | 0.044 |
| 500 | 32768 | 22000 | 15.3 | 0.208 | 0.241 |
| 500 | 32768 | 23000 | 15.3 | 0.199 | 0.231 |
| 500 | 32768 | 24000 | 15.3 | 0.191 | 0.221 |
BW … band width
nchan … number of spectral channels
nu … center frequency
Df … Channel separation (in frequency)
Dv … Channel separation (in velocity)
dv … Velocity resolution (dv=1.16*Dv)
Tcal measurements
to be done
information_for_astronomers/rx/s14mm.1389873279.txt.gz · Last modified: 2014/01/16 12:54 by ubach
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