6.5mm primary focus receiver (41050-49700 MHz)

This receiver was build for spectroscopic observations. Its frequency range is divided into two channels (41-45 GHz, 45-50 GHz), each with its own (linearly polarized) feed horn separate by 107 arcsec.

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
41.5 A linear 11.0 170 0.61 280 36 1.3 47 23.4 Feb 2008
44.0 A linear 9.0 153 0.43 358 25 1.3 33 22.0 Feb 2008
48.0 B linear 7.0 135 0.28 498 17 1.3 22 20.5 Feb 2008
49.0 B linear 5.0 127 0.25 508 13 1.4 17 19.0 Feb 2008
normalized Gain curve (G = A0 + A1·Elv + A2·Elv2) Observed in confirmed
A0=0.68500A1=1.7763E-2 A2=-2.4878E-4Feb 2008

Comments:

  • Gain curves are opacity corrected. Opacity was tau=0.12 during the observations. Values between 0.12 and 0.15 should be typical for good weather conditions at this frequency.

Version description for OBSINP

RX Name Wavelength [cm] Frequency (center) [GHz] Nr. of Horns
P6mm (41,1-49.8 GHz,6.5mm) 0.65 41.05-49.8 2
Version: Comment
1. Cont./Line: 41,05-45,5 GHz (BW: 500 MHz) Continuum and spectroscopy 1st freq. range, horn 1
2. Cont./Line: 45,25-49,7 GHz (BW: 500 MHz) Continuum and spectroscopy 2nd freq. range, horn 2
Horn offsets [arcsec] (0.0,0.0), (0.0,107.0)

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

6.5mm PFK
Channel IF Pol. Comment
1 BB linear Horn 1, TP A, 41.05-45.5 GHz
2 BB linear Horn 2, TP A, 45.25-49.7 GHz
3 VLBA linear Horn 1, TP A, 41.05-45.5 GHz
4 VLBA linear Horn 2, TP A, 45.25-49.7 GHz

Spectroscopy modes and resolution

BW nchan nu Df Dv dv
MHz MHz kHz km/s km/s
100 32768 41000 3.1 0.022 0.026
100 32768 43000 3.1 0.021 0.025
100 32768 45000 3.1 0.020 0.024
100 32768 47000 3.1 0.019 0.023
100 32768 49000 3.1 0.019 0.022
500 32768 41000 15.3 0.112 0.129
500 32768 43000 15.3 0.106 0.123
500 32768 45000 15.3 0.102 0.118
500 32768 47000 15.3 0.097 0.113
500 32768 49000 15.3 0.093 0.108

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

 
information_for_astronomers/rx/p6mm.txt · Last modified: 2013/10/21 15:39 by bwinkel     Back to top