Spectrum Summary of GBT Receiver Bands

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Spectrum Summary of GBT Receiver Bands
Caveat Emptor Many of these scans are old by as
much as several years. Since there is no
systematic archiving of GBT RFI scans, reporting
is spotty, and an overview like this is difficult
to piece together. Automated, archival monitoring
of the RFI environment at Green Bank is one of
the goals of our group.
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PF1.1 290 MHz 395 MHz
Military Aircraft (225 MHz 400 MHz) Evers MOA
and others
Leaky Local Cable TV, Part 15 devices,
unintentional sources
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PF1.1 290 MHz 395 MHz (contd)
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PF1.2 385 MHz 520 MHz
Military aircraft
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PF1.3 510 MHz 690 MHz
RA Band
Digital Channels
Spectrum dominated by UHF TV stations located
outside NRQZ. Only Channel 37 (608 MHz - 614 MHz)
really usable. The impending shift to digital
broadcasting will only worsen the picture.
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PF1.4 680 MHz 920 MHz
Airphone Services
Land Mobile
UHF TV
Radiolocation
Power line? Welding? Fluorescent lights?
902-928 ISM band Intentional Radiators
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PF2 910 MHz 1230 MHz
Radiolocation/ISM
Fixed/Mobile (various)
Aeronautical Radionavigation (mobile and land
based)
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L Band 1150 MHz 1730 MHz
Notch Filter designed to keep radar at Roanoke
Airport from overloading receiver.
GEOS or NOAA WX ? IRIDIUM 1621 - 1627 GPS L1
1575.42 L2 1227.6 L3
1381.05 Aeronautical Radionavigation
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S Band 1730 MHz 2600 MHz
2320 2360 Sirus and XM Broadcast Satellites
2400 2483.5 ISM band Unlicensed Intentional
Radiators
All Az, filtered, 2/8/02
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S Band 200 mW WIFI Potential Interference Map
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Above S Band

• Generally, less terrestrial sources and more
  satellite and airborne sources. A few
  possibilities
• 3700-4200 MHz geostationary satellite TV
  downlinks
• 5725-5850 MHz ISM band Unlicensed Intentional
  Radiators
• 11.7-12.7 GHz geostationary satellite TV
  downlinks

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