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information_for_astronomers:rx:p170mm
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information_for_astronomers:rx:p170mm [2016/12/12 11:02] akraus |
information_for_astronomers:rx:p170mm [2025/06/04 18:19] (current) akraus |
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| - | ====== 17cm prime focus receiver, UBB (600-3000 MHz) ====== | + | ====== P170mm - ultra broad-band prime focus receiver (1300-6000 MHz) ====== |
| - | This is an ultra broad band (UBB) 2-channel system covering a range from 1200 to 3000 MHz. The band used to be | + | This is an ultra broad band (UBB) 2-channel system covering a range from 1300 to 6000 MHz. |
| - | 0.6 - 3.0 GHz, but that was changed due to RFI issues. Be aware that there is still a lot of RFI in the current | + | |
| - | frequency range. The system is mainly used for pulsar observations. | + | |
| - | ==== Calibration Information ==== | + | ==== Overview ==== |
| - | ^ 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 ^ | + | ^ RX Name ^ [[information_for_astronomers:rx:bands|Band]] ^ Frequency range [GHz] ^ Polarisation^Nr. of Horns ^Horn position relativ to center of focus cabin^ |
| - | |0.85 (not available any more) |A+B |LCP+RCP |97.0 |48 |1.25 |38 |44 | | |930 |Sep 2012 | | + | | **P170mm** | L/S/C | 1.3-6.0| dual-linear| 1 | Az: 0 arcsec, Elv: 0 arcsec | |
| - | |1.4 |A+B |LCP+RCP |188.0 |56 |1.25 |45 |44 | | |650 |Sep 2012 | | + | |
| - | |2.35 |A+B |LCP+RCP |156.0 |53 |1.25 |42 |44 | | |400 |Sep 2012 | | + | |
| - | ^ normalized Gain curve (G = A0 + A1·Elv + A2·Elv2)^^^ Observed in ^ confirmed ^ | ||
| - | |A0 = 1.0|A1 = 0.0|A2 = 0.0|Sep 2012| | | ||
| - | **Comments:** | ||
| - | * Receiver has been modified in 2016 due to RFI issues. The frequency range was originally 0.6 - 3.0 GHz, now the lower band edge is as 1.2 GHz. | ||
| - | ==== Version description for OBSINP ==== | + | ==== Calibration Information ==== |
| - | ^ RX Name ^ Wavelength [cm] ^ Frequency (center) [GHz] ^ Nr. of Horns ^ | + | ^ 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 ^ |
| - | | **P170mm UBB (1.2-3 GHz) ** | 25.0-10.0 | 1.2-3.0 (1.8) | 1 | | + | |1.41 |A+B |2x lin |5.7 |19.8 |1.3 |15.2 |46 |1.90 |68 |569 |first observations | |
| - | | **Version:** | **Comment** ||| | + | |1.665|A+B |2x lin |6.7 |20.6 |1.3 |15.8 |46 |1.78 |73 |497 |first observations | |
| - | |1. Continuum/Line | Continuum and spectroscopy version ||| | + | |2.35 |A+B |2x lin |8.8 |16.1 |1.3 |12.4 |46 |1.68 |77 |363 |first observations | |
| - | |2. Pulsar | Pulsar Version ||| | + | |3.35 |A+B |2x lin |11.0|16.5 |1.3 |12.7 |46 |1.66 |78 |256 |first observations | |
| - | | **Horn offsets** [arcsec]| 0.0, 0.0 ||| | + | |4.85 |A+B |2x lin |12.5|18.8 |1.3 |14.5 |46 |1.71 |76 |174 |first observations | |
| + | |5.54 |A+B |2x lin |11.6|19.0 |1.3 |14.6 |46 |1.64 |79 |156 |first observations | | ||
| - | ==== Channel assignment in the MBFITS data files ==== | + | ^ normalized Gain curve (G = A0 + A1·Elv + A2·Elv2)^^^ Observed in ^ confirmed ^ |
| + | |A0 = 1.0|A1 = 0.0|A2 = 0.0| | | | ||
| - | 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. | + | **Comments:** |
| + | * The system delivers two basebands, 1.3-2.6 GHz and 3.0-6.0 GHz. Currently, it is only possible to record both bands in parallel for pulsar observations (timing and search mode), but not yet for continuum or spectroscopic observations. | ||
| + | * Usable / useful continuum bands are e.g. 1.405-1.415 GHz, 1.66-1.67 GHz, 4.7-5.0 GHz, 5.3-5.6 GHz. | ||
| - | 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. | + | |
| + | ==== Available receiver versions (for OBSINP) ==== | ||
| - | Abbreviations:\\ | + | ^Version^Description^Details^ |
| - | SB: narrow band channel (Schmalband-Kanal), 100 MHz band width\\ | + | |EDDPOL | spectro-polarimeter backend for continuum observations in the lower band|with 64k channels | |
| - | BB: digital broad band channel (Breitband-Kanal), band width varies for different receivers\\ | + | |EDDPOL3G | spectro-polarimeter backend for continuum observations in the upper band|with 64k channels | |
| - | VLBA: VLBA IF, 500 MHz band width\\ | + | |EDD_PULSAR_TIMING| pulsar folding mode observations | coherent dedispersion, configurable channels and subints | |
| - | optical: optical fibre with 4 GHz of band width\\ | + | |EDD_PULSAR_SEARCH| pulsar search mode observations | coherent filterbank, configurable channels and time samples (down to 32$\mu$s) | |
| - | BW: band width\\ | + | |
| - | TP: total power | + | |
| - | ^ P170mm UBB (1.2-3 GHz) ^^^^ | ||
| - | ^ Channel ^ IF ^ Pol. ^ Comment ^ | ||
| - | | 1 | optical | LCP | TP A | | ||
| - | | 2 | optical | RCP | TP B | | ||
| - | ==== Tcal and Tsys measurements ==== | ||
| - | TODO | ||
information_for_astronomers/rx/p170mm.1481536959.txt.gz · Last modified: 2016/12/12 11:02 by akraus
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