50cm prime focus receiver (300-900 MHz)

This is a wide band 2-channel system covering a range from 300 to 900 MHz. The system can be used for continuum, pulsar and VLBI observations.

Be aware that there is also a lot of RFI in this band. Therefore, some frequency ranges have been blanked out by filters. Available frequencies are 300 - 505 MHz, 608 - 685 MHz, and 790 - 915 MHz.

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
0.61 A LCP 12.5 320 1.3 246 45.8 1450 May 2011
normalized Gain curve (G = A0 + A1·Elv + A2·Elv2) Observed in confirmed
A0 = 1.0A1 = 0.0A2 = 0.0May 2011

Comments:

  • Preliminary data - more testing needed!

Version description for OBSINP

RX Name Wavelength [cm] Frequency (center) [GHz] Nr. of Horns
P500mm (300-900 MHz) 92.0-32.0 0.3-0.9 (0.6) 1
Version: Comment
1. Continuum (BW: 80 MHz) Narrow Band Continuum
2. Pulsar (BW: 600 MHz) Pulsar 600 MHz BW 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 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

50cm PFK (300–900MHz)
Channel IF Pol. Comment
1 SB LCP TP A
2 SB RCP TP B

Tcal and Tsys measurements

TODO

 
information_for_astronomers/rx/p500mm.txt · Last modified: 2013/10/08 11:15 by akraus     Back to top