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- Wireless communications and broadcasting play an increasingly vital role
in enabling people throughout the world to communicate. These systems
also serve to inform, entertain, educate and protect our citizens.
Wireless services also present unique regulatory challenges for countries
all over the world, especially developing countries.
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- Because about sixty five percent of our current knowledge of the
universe has stemmed from radio astronomy alone. The discovery of
quasars, pulsars, black holes, the 3K background from the "Big
Bang" and the discovery of biochemical hydrogen/carbon molecules
are all the result of professional radio astronomy. ( From the SARA
Web Site )
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- Development of low-noise receivers have made possible satellite
communications.
- Image-processing techniques have resulted in medical imaging.
- Development of computer science, mechanical engineering, electronics has
been accelerated.
- Measurements of continental drift have improved and data on global
climates have been provided.
- Provision of Educational Services to our country is being provided.
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- Allocations in the U.S.: http://www.jneuhaus.com/fccindex/spectrum.html
- U.S. Frequency Allocation Chart: http://www.ntia.doc.gov/osmhome/allochrt.html
- Radio Astronomy Frequencies: http://www.astron.nl/craf/threats.htm
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- Maximize the efficient use of radio spectrum
- Ensure that spectrum is made available for new technologies and
services, and flexibility is preserved to adapt to new market needs
- Develop a fair, efficient and transparent process for awarding licenses
- Make allocation and licensing assignments based on marketplace demands
- Promote competition
- Ensure that spectrum is available for important public benefits (i.e.,
safety and health)
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- Local Interference Studies: The Quiet Skies Project
- International Interference Mitigation: http://www.atnf.csiro.au/SKA/intmit/
- Green Bank Interference Group: http://www.gb.nrao.edu/~rfisher/ipg.html
- Monitoring Interference at NRAO, Green Bank: http://www.gb.nrao.edu/RFI/
- Interference and Radio Astronomy: http://www.darksky.org/links/radioast.html
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- Cell Phone Transmissions- 824-849 MHz
- Computers- 800 MHz but many other frequency ranges
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- Broadcasting Satellite Service: Space Operation Service- 1400-1427 MHz
- Aeronautical Navigation Service- 1330-1400 MHz
- Radio Navigation Satellites, Mobile Service Frequencies, Radio Location
Service, Fixed Service- 1350-1400
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- Metrological Aids (Satellite) Service- 1660-1660.5 MHz; 1668.4-1670 MHz
- Fixed Satellite Service- 1660.5-1668.4 MHz
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- RFI is any electromagnetic signal not of cosmic origin.
- Any thing that produces an electric arc produces broadband radio
frequencies.
- Radio astronomy is very susceptible to RFI from active services (i.e.
satellites, cell phone towers, etc.) especially since they receive
signals on the order of 109 times weaker than signals from
active services.
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- PC and portable radio tuned an AM channel- cover in foil- any
difference?
- TV cable loose from TV-run vacuum- turn on FM radio
- Loosen coaxial cable from TV- bring portable radio close by and tune to
FM station.
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- Local Interference Studies: The Quiet Skies Project
- Propagation Studies using Radio Mobile. Software can be downloaded at
this site.
- Directions for use of Radio Mobile.
- Propagation studies using MSAM. Download Horizon, Profile, Shado.
- Radio Jove
- Radio Astronomy of Pulsars
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