Arecibo Observatory Narrow S-Band Receiver (2.24-2.42 GHz)

Äîêóìåíò âçÿò èç êýøà ïîèñêîâîé ìàøèíû. Àäðåñ îðèãèíàëüíîãî äîêóìåíòà : http://www.naic.edu/~astro/RXstatus/Sradar/Sradar.shtml
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Äàòà èíäåêñèðîâàíèÿ: Mon Feb 4 02:59:38 2013
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S-Band Radar (2.24 - 2.42 GHz)

Basic Information

Calibration & Beam Parameters

RFI Situation

Recent Events

Receiver History

Contact Info

1. Basic Information:

Frequency Range (GHz):	2.24 - 2.34 or 2.33 - 2.43
Name and Number:	sbn, 12
Measured Sensitivity (K/Jy):	10*
Measured System Temp (K):	23, 25*
Native Polarization:	Circular (can be changed to linear with sufficient advanced notice). The polarizer is a narrowband turnstile, and is only circular at 2380 MHz. At 2296, it is about 10% linear, but the polarizations are still quite orthogonal.
Beam Size (at 2.38 GHz):	130 arcsec
Available Filters:	The receiver has a switch selectable 0.1 GHz filter at ether 2.29 or 2.38 MHz. click here for a description.
Warnings and Important Notes:	This receiver is expected to be replaced by the end of 2006.

*See calibration info below for a more accurate description of the telescope parameters!

Available Filters

2.33-2.43 GHz or 2.24-2.34 GHz, switch slectable from a manual switch in the reciever room. It is normally left in the higher range, which is the band used by the Arecibo Planetary radar. If you expect to need to adjust it, contact us in advance to make sure that it's working.

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2. Calibration & Beam Parameters:

Gain and Tsys

Cal Values

Beam Maps

Polarization

Misc. Info

Gain and Tsys
click here
Cal Values
This receiver has only a single correlated cal. The official values are 6.90 K and 6.76 K.
Polarization
The receiver is native circular using a turnstile junction as a polarizer centered 2380 MHz. It is about 10% linear by 2296 MHz. The polarizer can be changed to linear by physically changing some waveguide. This procedure used to take about an hour, but we haven't tried it since the installation of ALFA, which involved moving a lot of equipment; so I don't know how easy it is anymore.
Misc. Info
To see an up-to-date plot of Tsys, just type tsys on your terminal after logging into Arecibo's computer network.

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3. RFI situation:

Very strong RFI outside of the window 2.35 to 2.40 GHz for the upper filter (2.33-2.43 MHz). The lower filter (2.24-2.34) is not well characterized.

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4. Recent Events:

The electronics department maintains a detailed Receiver log.

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5. Receiver History:

The turnstile polarizations were swapped on 2003 Oct 15, so that RCP (polarization A) is the colder one. The cables were also swapped, so there should be no visible change except the temperature and the cal values.

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7. Contact Info:

For further information on this receiver, please contact Michael Nolan at
nolan (append @naic.edu)

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