====== 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 = 1.0|A1 = 0.0|A2 = 0.0|Sep 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