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610/700 MHz
Basic Information

Calibration & Beam Parameters

RFI Situation

Recent Events

Receiver History

Contact Info

 

 

 

1. Basic Information:

 

Frequency Range (GHz):     (1) 607.6 - 611.8 MHz (HPW)*
(2) 690.0 - 730.0 MHz         

Name and Number:

610/700 MHz (610, 3)
Measured Sensitivity (K/Jy): 11 K/Jy*
Measured System Temp (K): [102 + T(sky)] K* at 610 MHz
Native Polarization: Linear
Beam Size (at 610 MHz): 7 x 8 arcmin
Available Filters: click here

*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:

The 610-MHz band is a protected band for radio astronomy between 608 and 614 MHz, (i.e. the purposely-vacant T.V. Channel 37). However, at Arecibo this band has historically suffered extreme RFI from out-of-band emissions originating from a nearby (spatially and in frequency) TV station. This is why the present relatively narrow-band filter is in the system at 610 MHz. It is hoped to obtain a wider-band filter in the near future to cover at least the complete protected band.

A recent spectrum showing the presence of RFI at 607.78 (mostly in Poln. A), 608.56 (Poln. B only), and 609.25 MHz, also illustrates the present pass-bands for the two polarization in native linear mode.



Daily RFI monitoring plots for the past several years from the Observatory "hill-top" monitoring system can be found in binders in either the telescope Control Room or by asking the Arecibo Spectrum Manager.

  • For the current daily average 610-MHz RFI plot from the Arecibo "hill-top" monitoring system, click here .

  • For the current frequency v time 610-MHz RFI plot from the Arecibo "hill-top" monitoring system, click here .

  • For the current frequency v time 610-MHz RFI plot (with band-pass correction) from the Arecibo "hill-top" monitoring system, click here .

  • For the current daily rms/mean v frequency 610-MHz RFI plot from the Arecibo "hill-top" monitoring system, click here .

The occurrence of RFI versus frequency by month and year since Jan 2001 can be found via the 611 (sic) link on this web page.

The 710-MHz band is only usable between MIDNIGHT and 6 AM. During that time, in accordance with a local agreement, TV Channel 54 at 711 MHz switches off.

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4. Recent Events:

    For the most recent history of the 610-MHz receiver, click here.

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5. Receiver History:

For a full history of the 610-MHz receiver, click here.

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6. Contact Info:

For further information on this receiver, please contact Chris Salter at
csalter (append @naic.edu)

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