Radioudbredelse, udbredelse af radiobølger eller radiofrekvensernes udbredelse beskriver hvordan radiobølger opfører sig, når de udsendes eller forplanter sig.
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Fænomener som påvirker radioudbredelsen:
- Refleksion – F.eks. i form af forskellige lag D, E, F1, F2 i ionosfæren i atmosfæren.
- Refraktion – F.eks. ved temperaturinversion i troposfæren i atmosfæren.
- Absorption – F.eks. Absorberes wifi ved 2,4 GHz af alt vandholdigt materiale som f.eks. blade.
- Diffraktion – "spredning".
Ionosfæren påvirkes af solvinden, som igen er påvirket af primært solens eventuelle solpletter og soludbrud.
Ionosfærereflektioner påvirker især frekvenser mellem ca. 100 kHz – 30 MHz – og undtagelsesvis op til 100 MHz.
Inversioner i troposfæren påvirker især frekvenser mellem ca. 50 MHz – 800 MHz (?).
Når meteorer nedbremses og opvarmes i jordens atmosfære, ioniseres den, og dette vil forbigående påvirke radioudbredelsen.
Se også
Kilder/referencer
- Citat: "...Durring a duct it is possible to hear stations on your scanner in the VHF and UHF band from about 50 to 900 mhz that includes picking up stations hundreds of miles away from your local police to fm radio to tv..."
Eksterne henvisninger
Wikimedia Commons har flere filer relateret til Radioudbredelse
- Types of Propagation 24. oktober 2007 hos Wayback Machine
- Elektronik Design: Radiobølger, solfakkel og røntgenstyrke 30. november 2004 hos Wayback Machine
- Kilde: Current Solar Data (from NOAA) Add an X-ray flare and Geomagnetic storm monitor to your website!
Meteor
- FM Radio Detection of Meteors 24. november 2004 hos Wayback Machine
- Turn your TV set into a Meteor Detector 7. april 2005 hos Wayback Machine
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