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Lowest Usable Frequency
ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
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Die Lowest Usable Frequency (LUF) ist die niedrigste, gerade noch nutzbare Frequenz im Kurzwellenbereich bei Raumwellenausbreitung, bei der die FeldstΓ€rke am Empfangsort ausreichend stark ist, um fΓΌr ein bestimmtes Zeitintervall an 90 % der ionosphΓ€risch ungestΓΆrten Tage eines Monats ein ausreichendes Signal-Rausch-VerhΓ€ltnis zu gewΓ€hrleisten.cite-ref-hfradio-1-0[1] Wird diese Frequenz unterschritten, wird das Signal in den unteren IonosphΓ€renschichten zu stark gedΓ€mpft und kann an der IonosphΓ€re nicht mehr reflektiert werden.
Die ionosphΓ€rische DΓ€mpfung ist von der Elektronendichte abhΓ€ngig. Somit Γ€ndert sich die LUF in AbhΓ€ngigkeit von der Tages- und Jahreszeit. Weiterhin hat die SonnenaktivitΓ€t einen dominierenden Einfluss auf die Elektronendichte.
Contents
β’ Siehe auch
β’ Einzelnachweise
ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
Siehe auch
Einzelnachweise
cite-note-hfradio-11. β MUF, LUF, and FOT - The Basics of the Maximum Usable Frequency. hfradio.org