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Ionosphäre Und Drahtloser Weitverkehr by Walter Dieminger

Ionosphäre Und Drahtloser Weitverkehr

by Walter Dieminger
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Book cover type: Paperback
  • ISBN13: 9783663006893
  • Binding: Paperback
  • Subject: N/A
  • Publisher: Vs Verlag Fur Sozialwissenschaften
  • Publisher Imprint: Vs Verlag Fur Sozialwissenschaften
  • Publication Date:
  • Pages: 63
  • Original Price: EUR 51.39
  • Language: German
  • Edition: 1958
  • Item Weight: 118 grams
  • BISAC Subject(s): General

Zusammenfassend kann man sagen: Die Ionosphäre ist für den draht- losen Weitverkehr von entscheidender Bedeutung. Nur Längstwellen und Kurzwellen, die beide an der Ionosphäre mit geringen Verlusten reflektiert werden, sind für Nachrichtenverkehr über Strecken von mehreren 1000 km geeignet. Die Kenntnis von der Ionosphäre ist durch direkte Beobach- tungen so weit fortgeschritten, da die Berechnung der Ausbreitungser- scheinungen aus dem Zustand der Ionosphäre mit ausreichender Genauig- keit erfolgen kann. Auch die Prognose der mittleren Ausbreitungsbe- dingungen ist mit Hilfe der Periodenforschung befriedigend gelöst. Da- gegen steckt die Vorhersage von Störungen noch in den Kinderschuhen. Wenn man sich nun die Frage stellt, ob der derzeitige Einsatz der Radio- wellen von den längsten bis zu den kürzesten diesen Erkenntnissen ent- spricht, so mu darauf leider mit Nein geantwortet werden. Für die heutige Wellenverteilung sind fast mehr historische und politische Gesichtspunkte ma gebend als physikalische. So ist z. B. die Verwendung der Bereiche von 550 kHz -1600 kHz für den Rundfunk einfach damit zu erklären, da bei seiner Einführung dieser Wellenbereich noch nicht von den Schiffs- und Küstenfunkstellen benutzt wurde. Tatsächlich wäre der Bereich von 180-1200 kHz dafür wesentlich besser geeignet. Auf die politischen Hintergründe aber will ich nicht eingehen. Das ist ein hei es Eisen, das ich mit ungeschützten Händen lieber nicht anfassen möchte. Ionosphäre und drahtloser Weit verkehr 49 Schrifttum (Nur zusammenfassende Darstellungen) U. S. Department 0/ Commerce, National Menzel, W.: Ionosphärische Einflüsse Bureau 0/ Standards: Ionospheric auf die Wellenausbreitung. Fern- Radio Propagation. Washington 1948 melde-Ingenieur 7, Heft 11,1 (1953).

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