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information_for_astronomers:rx:s28mm
Table of Contents
2.8cm secondary focus receiver (10300-10600 MHz)
This is a 2-horn system for sensitive continuum measurement, polarimetry, VLBI, and pulsar observations.
Overview
| RX Name | Band | Frequency range [GHz] | Polarisation | Nr. of Horns | Horn position relativ to center of focus cabin |
|---|---|---|---|---|---|
| S28mm | X | 10.3-10.6 | dual-circular | 1 | Horn 1: Az: -535.0 arcsec, Elv: -450.0 arcsec, Horn 2: Az: -825.0 arcsec, Elv: -450.0 arcsec |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 10.45 | A (BB) | LCP | 6.4 | 47 | 1.34 | 37 | 49 | 2.3 | 59 | 69 | Jan 2014 |
| 10.45 | B (BB) | RCP | 6.3 | 53 | 1.35 | 38 | 50 | 2.3 | 59 | 69 | Jan 2014 |
| normalized Gain curve (G = A0 + A1·Elv + A2·Elv2) | Observed in | confirmed | ||
|---|---|---|---|---|
| A0 = 0.9768 | A1 = 1.280E-3 | A2 = -1.763E-5 | Aug 2023 | |
Comments:
Available receiver versions (for OBSINP)
| Version | Description | Details |
|---|---|---|
| continuum | standard continuum backend with internal polarimeter | bandwidth 300 MHz |
| spectroscopy_100mhz | spectroscopy version with the XFFT-spectrometer |
Below here: Information is currently updated.
Version description for OBSINP
| RX Name | Wavelength [cm] | Frequency (center) [GHz] | Nr. of Horns |
|---|---|---|---|
| S28mm 4-beam | 2.8 | 10.3-10.6 (10.45) | 2 |
| Version: | Comment | ||
| 1. Continuum/Line (BW: 300 MHz) | Continuum/Spectroscopy + Polarimeter | ||
| 2. Pulsar (BW: 100 MHz) | Pulsar narrow band | ||
| Horn offsets [arcsec] | Horn 1: -535.0,-450.0, 2: -825.0,-450.0 | ||
Channel assignment in the MBFITS data files
| 2.8cm SFK multi horn receiver with polarimeter, 1 horns | |||
|---|---|---|---|
| Channel | IF | Pol. | Comment |
| 1 | BB | LCP | Horn 2, TP A |
| 2 | BB | RCP | Horn 2, TP B |
| 3 | BB | cross | Horn 2, cos AB |
| 4 | BB | cross | Horn 2, sin AB |
| 5 | BB | LCP | Horn 1, TP A |
| 6 | BB | RCP | Horn 1, TP B |
| 7 | BB | cross | Horn 1, cos AB |
| 8 | BB | cross | Horn 1, sin AB |
Spectroscopy modes and resolution
| BW | nchan | nu | Df | Dv | dv |
|---|---|---|---|---|---|
| MHz | MHz | kHz | km/s | km/s | |
| 100 | 32768 | 10300 | 3.1 | 0.089 | 0.103 |
| 100 | 32768 | 10400 | 3.1 | 0.088 | 0.102 |
| 100 | 32768 | 10500 | 3.1 | 0.087 | 0.101 |
| 100 | 32768 | 10600 | 3.1 | 0.086 | 0.100 |
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
TODO
information_for_astronomers/rx/s28mm.txt · Last modified: 2024/09/09 09:27 by akraus
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