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S-Low Receiver
Basic Information

Calibration & Beam Parameters

RFI Situation

Recent Events

Receiver History

Technical Description

Contact Info




1. Basic Information:


Frequency Range (GHz): 1.7 - 3.0

Name and Number:

sbl, sbl1_2, and 7, 71 (*)
Measured Sensitivity (K/Jy): ~ 8 (**)
Measured System Temp (K): ~ 34 (**)
Native Polarization: Dual Linear
Beam Size (at 2.5 GHz): 1.8 x 2.0 arcmin
Available Filters: 3 Bandpass filters, 1.7 - 1.88, 2.04 - 2.4, & 2.6 - 3.0 GHz
can be used in any combination or none
Warnings and Important Notes: This Rx has a lot of Resonance modesin the OMT

* The two different names and numbers are used for different IF/LO paths in IFSETUP command
** See calibration info below for a more accurate description of the telescope parameters

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2. Calibration & Beam Parameters:

Gain and Tsys Cal Values Beam Maps Polarization Misc. Info

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3. RFI situation:

Spectral scans covering the S-low receiver's bandpass was taken (by S. Stanimirovic) on Sep 20 2001. The measurement was from 1800 MHz to 2950 MHz. The largest RFI seen were: at 1940 Mhz from cellular phones, at 2700 MHz from the 2nd harmonics of the San Juan airport radar at 1330/1350 MHz, and at 2900-3100 MHz from the radar at Pico del Este.

The figure ( available here) plots the spectrum from 1800 Mhz to 2950 Mhz. The resolution bandwidth was set to 3 Mhz. The system temperature is about 40 K. The red line averages 100 sweeps of the spectrum analyzer. Integrating the spectra gave -23.5 dbm (pol. A) and -24.3 dbm (pol. B). the top figure is polarization A and the bottom for polarization B.

This document lists all RFI spikes/features seen on the (2001) spectral scan. In addition, it lists the resonance modes seen in this receiver as well.

A few RFI-related useful links (on AO pages) are:

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4. Recent Events:

Recent events can be found in the electronics receiver log.

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5. Receiver History:

Used regularly by wide-band pulsar observers. This band has also been used for SETI observations.

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6. Technical Info:

To find out the technical details about this receiver, just click on the appropriate icon at the top of the Receiver tabel (Only internally available -- please contact the POC for anything specific).

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7. Contact Info:

For further information on this receiver, please contact T. Ghosh at
tghosh (append

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