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information_for_astronomers:rx:p50mm
Table of Contents
5-cm primary focus receiver (5750-6750 MHz)
This is a 2-channel system mostly used for spectroscopy and (spectral line-) VLBI. Channel A has a slightly higher Tsys than B.
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 6.032 | A | LCP | 3.6 | 40 | 1.5 | 26 | 53 | 1.9 | 79 | 132 | Jul 2008 |
| 6.032 | B | RCP | 3.4 | 32 | 1.5 | 20 | 53 | 1.9 | 79 | 132 | Jul 2008 |
| 6.140 | A | LCP | 3.1 | 37 | 1.5 | 24 | 53 | 1.9 | 78 | 129 | Jul 2008 |
| 6.140 | B | RCP | 3.2 | 30 | 1.5 | 23 | 53 | 1.9 | 78 | 129 | Jul 2008 |
| 6.650 | A | LCP | 2.8 | 39 | 1.5 | 26 | 53 | 1.9 | 78 | 121 | Jul 2008 |
| 6.650 | B | RCP | 2.9 | 33 | 1.5 | 24 | 53 | 1.9 | 78 | 121 | Jul 2008 |
| normalized Gain curve (G = A0 + A1·Elv + A2·Elv2) | Observed in | confirmed | ||
|---|---|---|---|---|
| A0=0.96098 | A1=1.5518E-3 | A2=-1.5381E-5 | Jul 2008 | |
Comments:
- None
Version description for OBSINP
| RX Name | Wavelength [cm] | Frequency (center) [GHz] | Nr. of Horns |
|---|---|---|---|
| P50mm 4-Box (5,75-6,75 GHz) | 5.0 | 5.75-6.75 (6.25) | 1 |
| Version: | Comment | ||
| 1. Cont./Line (BW: 100 MHz) | Continuum and spectroscopy version | ||
| 2. 10dB Atten. Cont./Line (BW: 100 MHz) | Continuum and spectroscopy version for very bright maser sources | ||
| 3. Cont. (BW: 1 GHz) | Broad band Continuum | ||
| 4. Line (BW: 500 MHz) | VLBA IF spectroscopy/VLBI version | ||
| Horn offsets [arcsec] | -690.6, 421.5 | ||
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
| 5.0cm PFK (Multi-RX-Box II) | |||
|---|---|---|---|
| Channel | IF | Pol. | Comment |
| 1 | SB | LCP | TP A |
| 2 | SB | RCP | TP B |
Spectroscopy modes and resolution
| BW | nchan | nu | Df | Dv | dv |
|---|---|---|---|---|---|
| MHz | MHz | kHz | km/s | km/s | |
| 100 | 32768 | 5800 | 3.1 | 0.158 | 0.183 |
| 100 | 32768 | 6000 | 3.1 | 0.152 | 0.177 |
| 100 | 32768 | 6200 | 3.1 | 0.148 | 0.171 |
| 100 | 32768 | 6400 | 3.1 | 0.143 | 0.166 |
| 100 | 32768 | 6600 | 3.1 | 0.139 | 0.161 |
| 500 | 32768 | 5800 | 15.3 | 0.789 | 0.915 |
| 500 | 32768 | 6000 | 15.3 | 0.762 | 0.884 |
| 500 | 32768 | 6200 | 15.3 | 0.738 | 0.856 |
| 500 | 32768 | 6400 | 15.3 | 0.715 | 0.829 |
| 500 | 32768 | 6600 | 15.3 | 0.693 | 0.804 |
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 and Tsys measurements
Januar 2014
Tcal and Tsys
Opacity and beam width
information_for_astronomers/rx/p50mm.txt · Last modified: 2014/01/28 14:09 by bwinkel
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