2.2cm/2.5cm prime focus receiver (12100-12280 MHz/12900-13600 MHz)

This is a 2-channel system used for spectroscopy. The 2.5cm part is realized by a new filter. The calibration parameters are still somewhat uncertain (about 10%). The lower part of the band at 12.1 GHz is affected by RFI from TV satellites which might also explain the higher Tsys.

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
12.10 A LCP 6.5 128 1.4 93 48 1.9 71 65.0 Dec 2009
12.10 A RCP 5.6 210 1.4 155 48 1.9 70 65.0 Dec 2009
12.18 A LCP 5.2 79 1.4 57 47 1.9 75 65.0 Dec 2009
12.18 A RCP 4.5 102 1.4 78 47 1.9 71 65.0 Dec 2009
13.09 A LCP 2.0 64 1.45 44 51 1.9 78 62.0 Aug 2009
13.09 B RCP 2.0 65 1.45 45 51 1.9 78 62.0 Aug 2009
13.39 A LCP 1.8 61 1.4 42 50 1.9 74 59.3 Sep 2005
13.39 B RCP 2.1 63 1.4 44 50 1.9 74 59.3 Sep 2005
normalized Gain curve (G = A0 + A1·Elv + A2·Elv2) Observed in confirmed
A0 = 0.9644A1 = 2.1838E-03A2 = -3.3018E-05Dec 2009

Comments:

  • The values across the band and for LCP and RCP do not differ significantly in the 2.2cm band.

Version description for OBSINP

RX Name Wavelength [cm] Frequency (center) [GHz] Nr. of Horns
P22mm 4-Box (12,1- 13,6 GHz) 2.2-2.5 12.1-13.6 (13.1) 1
Version: Comment
1. Cont./Line: 12,1-12,25 GHz (2,5 cm) (BW: 100 MHz) Continuum and spectroscopy at 2.5cm
2. Cont./Line: 12,9-13,6 GHz (2,2 cm) (BW: 100 MHz) Continuum and spectroscopy at 2.2cm
Horn offsets [arcsec] -1155.5, 1066.7

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

2.2cm/2.5cm PFK (Multi-RX-Box II)
Channel IF Pol. Comment
1 SB LCP 2.2cm, TP A
2 SB RCP 2.2cm, TP B
3 SB cross 2.2cm, cos AB
4 SB cross 2.2cm, sin AB
5 SB LCP 2.5cm, TP A
6 SB RCP 2.5cm, TP B

Spectroscopy modes and resolution

BW nchan nu Df Dv dv
MHz MHz kHz km/s km/s
100 32768 12100 3.1 0.076 0.088
100 32768 12150 3.1 0.075 0.087
100 32768 12200 3.1 0.075 0.087
100 32768 12250 3.1 0.075 0.087
100 32768 12900 3.1 0.071 0.082
100 32768 13000 3.1 0.070 0.082
100 32768 13100 3.1 0.070 0.081
100 32768 13200 3.1 0.069 0.080
100 32768 13300 3.1 0.069 0.080
100 32768 13400 3.1 0.068 0.079
100 32768 13500 3.1 0.068 0.079
100 32768 13600 3.1 0.067 0.078

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

TODO

 
information_for_astronomers/rx/p22mm.txt · Last modified: 2013/10/21 15:38 by bwinkel     Back to top