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NRAO Green Bank Policies for RFI Management. Different Policies Apply in 5 Different Zones. Zone 5: National Radio Quiet Zone (NRQZ) Zone 4: 10-Mile Radius Radio Astronomy Zone Zone 3: 2-Mile Radius Radio Astronomy Zone Zone 2: Observatory Building Zone

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different policies apply in 5 different zones
Different Policies Apply in 5 Different Zones
  • Zone 5: National Radio Quiet Zone (NRQZ)
  • Zone 4: 10-Mile Radius Radio Astronomy Zone
  • Zone 3: 2-Mile Radius Radio Astronomy Zone
  • Zone 2: Observatory Building Zone

(Housing, Laboratory, Shop, Dormitories, Cafeteria, Visitor Center)

  • Zone 1: Radio Astronomy Instrument Zone

(“ground zero” a.k.a. “everything beyond the gate”)

zone 5 the national radio quiet zone
Zone 5: The National Radio Quiet Zone
  • Established by an act of congress in 1958
  • Approx. 13,000 sq. mile area
  • Requires coordination for all permanent, fixed, licensed transmitters
  • Administered through NRAO Green Bank for the mutual benefit of NRAO and the Sugar Grove Facility
zones 3 4 wv radio astronomy zoning act
Zones 3 & 4: WV Radio Astronomy Zoning Act
  • Established through §37A-1-2 of the West Virginia Code “The Radio Astronomy Zoning Act”
  • Applies to any electrical equipment that causes harmful interference to Radio Astronomical Observations
  • Increasingly difficult and complex problem due to the proliferation of wireless technologies
  • Our Strategy:
    • Problem-driven component: we will seek enforcement only as a last resort, if friendly requests repeatedly fail.
    • Proactive component: We solicit voluntary cooperation: PR campaign is in the works, other efforts in the planning stage.
zones 1 2 on site rfi policy
Zones 1 & 2: On-Site RFI Policy
  • IPG Develops Policy; Site Director has final authority
  • ITU-R RA.769 Limit applies
zone 1 radio astronomy instrument zone
Zone 1: Radio Astronomy Instrument Zone
  • Intentional Radiators:

ESSENTIAL for operation only; comprehensive list maintained by IPG

  • Unintentional radiators:
    • Installed Equipment
      • Must comply with ITU-R RA.769 limits
    • Uninstalled Equipment
      • Portable Test/Maintenance Equipment
        • May not be left operating unattended, or it will be considered “installed”
      • Automobiles: Diesel vehicles ONLY with the following approved exceptions:
        • Handicapped tourist access

At risk of stating the obvious: In Zone 1, ALL equipment is subject to the same restrictions, whether it belongs to Visiting Scientists, Summer Students, Educational Groups, or the Permanent Staff of the Green Bank Site.

zone 2 observatory building zone
Zone 2: Observatory Building Zone

Housing, Laboratory, Shop, Dormitories, Cafeteria, Visitor Center

  • Intentional Radiators:
    • Essential for operation only; comprehensive list maintained by IPG
    • Licensed services coordinated with NRQZ office
    • No other intentional radiators (WIFI, Cordless Phones, Wireless Speakers, etc.)
  • Unintentional radiators:
    • High-Risk Equipment (is it worse than the “average” PC?)
    • Equipment that runs continuously and exceeds ITU-R RA.769
    • Equipment that exceeds ITU-R RA.769 by “typical PC” levels (30dB at the location of the Jansky lab) but is powered down when not in use.
concluding remarks requests
Concluding Remarks/Requests
  • We are a Radio Astronomy Observatory.
  • The RFI group does not have the resources to accomplish these goals without your cooperation.
  • Please think about what this policy might mean for you; if you are unsure, please ask.