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This is an old revision of the document!
This is a 4-channel two horn system for continuum, spectroscopy and VLBI observations. This is a new receiver currently in commissioning and was installed in March 2018. More details will follow.
This are preliminary results from first tests and can easily be off by 10 or 15 %.
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 |
---|---|---|---|---|---|---|---|---|---|---|---|
35.75 | A | LCP | 7.5 | 77 | 0.76 | 102 | 26 | 1.6 | 47 | 24.4 | May 2018 |
35.75 | B | RCP | 6.9 | 83 | 0.75 | 112 | 26 | 1.6 | 47 | 24.5 | May 2018 |
38.25 | A | LCP | 9.3 | 90 | 0.62 | 145 | 22 | 1.6 | 38 | 22.5 | May 2018 |
38.25 | B | RCP | 9.1 | 94 | 0.66 | 143 | 23 | 1.6 | 40 | 22.6 | May 2018 |
42.75 | A | LCP | 9.5 | 84 | 0.76 | 110 | 26 | 1.5 | 50 | 20.9 | May 2018 |
42.75 | B | RCP | 8.7 | 85 | 0.77 | 111 | 27 | 1.5 | 50 | 21.1 | May 2018 |
45.25 | A | LCP | 8.5 | 99 | 0.63 | 156 | 22 | 1.5 | 42 | 19.7 | May 2018 |
45.25 | B | RCP | 8.2 | 103 | 0.65 | 159 | 22 | 1.5 | 47 | 19.8 | May 2018 |
normalized Gain curve (G = A0 + A1·Elv + A2·Elv2) | Observed in | confirmed | ||
---|---|---|---|---|
A0 = 0.897 | A1 = 7.5E-3 | A2 = -1.35E-04 | Below 40 GHz, May 2018 | |
A0 = 0.897 | A1 = 7.85E-3 | A2 = -1.5E-04 | Above 40 GHz, May 2018 |
Comments:
RX Name | Wavelength [cm] | Frequency (center) [GHz] | Nr. of Horns |
---|---|---|---|
S7mm double beam RX | 0.7 | 33.5-50.0 (42.0) | 2 |
Version: | Comment | ||
1. Continuum (BW: 2.5 GHz) | Broad Band Continuum | ||
2. Line (BW: 2500 MHz) | Spectroscopy/Continuum using optical IF | ||
Horn offsets [arcsec] | 107.7,-451.8; 219.2,-451.8 |
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
7mm SFK dual horn receiver | |||
---|---|---|---|
Channel | IF | Pol. | Comment |
1 | 2.5 GHz | LCP | TP A, horn 1 |
2 | 2.5 GHz | RCP | TP B, horn 1 |
3 | 2.5 GHz | LCP | TP A, horn 2 |
4 | 2.5 GHz | RCP | TP B, horn 2 |
To be done.
To be done.