17cm prime focus receiver, UBB (600-3000 MHz)

This is an ultra broad band (UBB) 2-channel system covering a range from 1200 to 3000 MHz. The band used to be 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

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
0.85 (not available any more) A+B 2x lin 97.0 48 1.25 38 44 930 Sep 2012
1.4 A+B 2x lin 188.0 56 1.25 45 44 650 Sep 2012
2.35 A+B 2x lin 156.0 53 1.25 42 44 400 Sep 2012
normalized Gain curve (G = A0 + A1·Elv + A2·Elv2) Observed in confirmed
A0 = 1.0A1 = 0.0A2 = 0.0Sep 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

RX Name Wavelength [cm] Frequency (center) [GHz] Nr. of Horns
P170mm UBB (1.2-3 GHz) 25.0-10.0 1.2-3.0 (1.8) 1
Version: Comment
1. Continuum/Line Continuum and spectroscopy version
2. Pulsar Pulsar Version
Horn offsets [arcsec] 0.0, 0.0

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 two (linearly polarized) 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

P170mm UBB (1.2-3 GHz)
Channel IF Pol. Comment
1 optical Horizontal TP A
2 optical Vertical TP B

Tcal and Tsys measurements

TODO

 
information_for_astronomers/rx/p170mm.txt · Last modified: 2019/02/20 14:09 by akraus     Back to top