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NRAO Green Bank > RFI Protection Group

RFI Management WiKi

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Links to RFI Management at Other Observatories:

Green Bank Interference Protection Group

The Green Bank Interference Protection Group is responsible for minimizing radio frequency interference to astronomical observations from equipment and activities at the Observatory. We also endeavor to suppress RFI sources in the local community and to properly administer the NRQZ.

On-Site RFI Mitigation...

RFI Policy  - What Every Green Bank Employee Needs to Know  (Powerpoint Presentation)

RFI Mitigation in the 10 mile radius...

Power Line RFI 

Select the link below to listen

AM Radio Powerline RFI audio
CB Radio Powerline RFI audio

M330 Powerline RFI locator audio
AR8000 Receiver Powerline RFI audio


 

Cable TV RFI





Wireless
Intentional Radiators


IEEE 802.11a 5 GHz wireless bands:
5150-5250 MHz (USA lower band)
5250-5350 MHz (USA middle band)
5725-5825 MHz (USA upper band)
More info








Observer Tools...

RFI Known Sources

Frequency Allocations

Spectrum Summaries

125 - 200 MHz

385 - 520 MHz  (PF1 450)

902 - 1240 MHz  (PF2)

195 - 1425 MHz  (from the 43m scope)

3950 - 5850 MHz  (C band)

17.7 - 20.2 GHz  (K band)

12.4 - 15.4 GHz  (Ku band)

C & Ku band Summary Report

5/2007 C band Summary Report

X-Band Spectrum Summary
06DEC05



RFI Surveys

Courtesy of Glen Langston:

Courtesy of Frank Ghigo

Courtesy of Toney Minter

12/14/07 GBT Monitoring Station RFI survey (selected bands 110 - 1450 MHz)

Geostationary Satellite Look Angles from the GBT



Our Equipment...


Portable Emissions Measurement Setup

IEEE-299 Portable SE Test Setup

Waveguide SE Test Setup

Anechoic Chamber

RFI Survey Antenna

"Deer Stand" RFI Monitoring/RFI Monitoring Station

Power Line RFI Locating Tools

Cable TV RFI sniffing setup

























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Modified on March 23, 2006