====== 2.8cm secondary focus receiver (10300-10600 MHz) ======

This is a 2-horn system for sensitive continuum measurement, polarimetry, VLBI, and pulsar observations.

==== Overview ====

^ RX Name ^ [[information_for_astronomers:rx:bands|Band]] ^ Frequency range [GHz] ^ Polarisation^Nr. of Horns ^Horn position relativ to center of focus cabin^
| **S28mm** | X | 10.3-10.6 | dual-circular| 1 | Horn 1: Az: -535.0 arcsec, Elv: -450.0 arcsec,\\ Horn 2: Az: -825.0 arcsec, Elv: -450.0 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 ^
|10.45 | A (BB) | LCP |6.4 |47 |1.34 |37 |49 |2.3 |59 |69 |Jan 2014|
|10.45 | B (BB) | RCP |6.3 |53 |1.35 |38 |50 |2.3 |59 |69 |Jan 2014|

^ normalized Gain curve (G = A0 + A1·Elv + A2·Elv2)^^^ Observed in ^ confirmed ^
|A0 = 0.9768|A1 = 1.280E-3|A2 = -1.763E-5|Aug 2023|  |

**Comments:**
  

==== Available receiver versions (for OBSINP) ====

^Version^Description^Details^
|continuum|standard continuum backend with internal polarimeter|bandwidth 300 MHz|
|spectroscopy_100mhz| spectroscopy version with the XFFT-spectrometer | |


**Below here: Information is currently updated.**


==== Version description for OBSINP ====

^ RX Name ^ Wavelength [cm] ^ Frequency (center) [GHz] ^ Nr. of Horns ^
| **S28mm 4-beam** | 2.8 | 10.3-10.6 (10.45) | 2 | 
| **Version:** |   **Comment**   |||
|1. Continuum/Line (BW: 300 MHz) | Continuum/Spectroscopy + Polarimeter |||
|2. Pulsar (BW: 100 MHz) | Pulsar narrow band |||
| **Horn offsets** [arcsec]| Horn 1: -535.0,-450.0, 2: -825.0,-450.0|||

==== Channel assignment in the MBFITS data files ====

^ 2.8cm SFK multi horn receiver with polarimeter, 1 horns ^^^^
^ Channel ^ IF ^ Pol. ^ Comment ^
|  1  |    BB	  |	LCP    | Horn 2, TP A  |
|  2  |    BB	  |	RCP    | Horn 2, TP B  |
|  3  |    BB	  |    cross   | Horn 2, cos AB  |
|  4  |    BB	  |    cross   | Horn 2, sin AB  |
|  5  |    BB	  |	LCP    | Horn 1, TP A  |
|  6  |    BB	  |	RCP    | Horn 1, TP B  |
|  7  |    BB	  |    cross   | Horn 1, cos AB  |
|  8  |    BB	  |    cross   | Horn 1, sin AB  |

==== Spectroscopy modes and resolution ====
^   BW ^ nchan ^    nu ^     Df ^     Dv ^     dv ^
^  MHz ^       ^   MHz ^    kHz ^   km/s ^   km/s ^
|  100 | 32768 | 10300 |    3.1 |  0.089 |  0.103 |
|  100 | 32768 | 10400 |    3.1 |  0.088 |  0.102 |
|  100 | 32768 | 10500 |    3.1 |  0.087 |  0.101 |
|  100 | 32768 | 10600 |    3.1 |  0.086 |  0.100 |

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