5-cm primary focus receiver (5750-6750 MHz)

This is a 2-channel system mostly used for spectroscopy and (spectral line-) VLBI. Channel A has a slightly higher Tsys than B.

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
6.032 A LCP 3.6 40 1.5 26 53 1.9 79 132 Jul 2008
6.032 B RCP 3.4 32 1.5 20 53 1.9 79 132 Jul 2008
6.140 A LCP 3.1 37 1.5 24 53 1.9 78 129 Jul 2008
6.140 B RCP 3.2 30 1.5 23 53 1.9 78 129 Jul 2008
6.650 A LCP 2.8 39 1.5 26 53 1.9 78 121 Jul 2008
6.650 B RCP 2.9 33 1.5 24 53 1.9 78 121 Jul 2008
normalized Gain curve (G = A0 + A1·Elv + A2·Elv2) Observed in confirmed
A0=0.96098A1=1.5518E-3A2=-1.5381E-5Jul 2008

Comments:

  • None

Version description for OBSINP

RX Name Wavelength [cm] Frequency (center) [GHz] Nr. of Horns
P50mm 4-Box (5,75-6,75 GHz) 5.0 5.75-6.75 (6.25) 1
Version: Comment
1. Cont./Line (BW: 100 MHz) Continuum and spectroscopy version
2. 10dB Atten. Cont./Line (BW: 100 MHz) Continuum and spectroscopy version for very bright maser sources
3. Cont. (BW: 1 GHz) Broad band Continuum
4. Line (BW: 500 MHz) VLBA IF spectroscopy/VLBI version
Horn offsets [arcsec] -690.6, 421.5

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
optical: optical fibre with 4 GHz of band width
BW: band width
TP: total power

5.0cm PFK (Multi-RX-Box II)
Channel IF Pol. Comment
1 SB LCP TP A
2 SB RCP TP B

Spectroscopy modes and resolution

BW nchan nu Df Dv dv
MHz MHz kHz km/s km/s
100 32768 5800 3.1 0.158 0.183
100 32768 6000 3.1 0.152 0.177
100 32768 6200 3.1 0.148 0.171
100 32768 6400 3.1 0.143 0.166
100 32768 6600 3.1 0.139 0.161
500 32768 5800 15.3 0.789 0.915
500 32768 6000 15.3 0.762 0.884
500 32768 6200 15.3 0.738 0.856
500 32768 6400 15.3 0.715 0.829
500 32768 6600 15.3 0.693 0.804

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

Januar 2014

Tcal and Tsys

Opacity and beam width

 
information_for_astronomers/rx/p50mm.txt · Last modified: 2014/01/28 14:09 by bwinkel     Back to top