FST at Hochschule RheinMain

Flashcards and summaries for FST at the Hochschule RheinMain

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Exemplary flashcards for FST at the Hochschule RheinMain on StudySmarter:

Transition Level und Layer bei QNH 1023 hPa berechnen

Exemplary flashcards for FST at the Hochschule RheinMain on StudySmarter:

Wie groß muss die Dämpfung (bei 100W) sein, um -5dBm zu erreichen?

Exemplary flashcards for FST at the Hochschule RheinMain on StudySmarter:

Ist 0W gleich 0dBW?

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Exemplary flashcards for FST at the Hochschule RheinMain on StudySmarter:

AM-Modulation means the generation of new frequencies. What are

these called?

Exemplary flashcards for FST at the Hochschule RheinMain on StudySmarter:

What does the modulation factor m indicate for AM?

Exemplary flashcards for FST at the Hochschule RheinMain on StudySmarter:

What happens when a radiation source moves towards an

observer?

Exemplary flashcards for FST at the Hochschule RheinMain on StudySmarter:

Why is vertical polarisation preferred in the LF and MF bands?

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Exemplary flashcards for FST at the Hochschule RheinMain on StudySmarter:

How long is an λ/4 antenna for 300 kHz?

Exemplary flashcards for FST at the Hochschule RheinMain on StudySmarter:

Why are radiotelephony antennas installed at heights of about 40 m?

Exemplary flashcards for FST at the Hochschule RheinMain on StudySmarter:

In which waveband does ground-wave propagation occur?

Exemplary flashcards for FST at the Hochschule RheinMain on StudySmarter:

Why does sky-wave propagation depend on the solar activity?

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Exemplary flashcards for FST at the Hochschule RheinMain on StudySmarter:

What are the advantages of frequency coupling?

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Exemplary flashcards for FST at the Hochschule RheinMain on StudySmarter:

FST

Transition Level und Layer bei QNH 1023 hPa berechnen

QNH- 1013= X

Transition Layer: X*30+1000

wenn > 1000 -> Transition Level FL60

wenn < 1000 -> FL 70

wenn < 0 -> FL 80 …

FST

Wie groß muss die Dämpfung (bei 100W) sein, um -5dBm zu erreichen?

-5 dBm=50 dBm- D

D= 55dB

FST

Ist 0W gleich 0dBW?

Nein. 0 dBW=1W da lg(1)=0

FST

AM-Modulation means the generation of new frequencies. What are

these called?

upper und lower sideband

FST

What does the modulation factor m indicate for AM?

Depth of modulation -> die Stärke der Modulation


m>100% -> Übermodulation mit Frequenzspitzen, die Störungen verursachen können


bei hohem m -> hohe S/N

FST

What happens when a radiation source moves towards an

observer?

Doppler Effekt: Die ausgesendete Frequenz erhöht sich

FST

Why is vertical polarisation preferred in the LF and MF bands?

- Kopplung mit Ground führt zu erhöhten Verlusten

- Reflektionen am Boden verursachen starke „Keulen“ -> Sehr inkonsistente Signalstärke im

Höhenverlauf, hohe Dämpfungen

- Für den Sprechfunk nur vertikale Polarisation

FST

How long is an λ/4 antenna for 300 kHz?

λ/4= c/300 kHz * ¼ = 250m

c=300.000.000 m/s

FST

Why are radiotelephony antennas installed at heights of about 40 m?

- reduziert erheblich die Interferenzen durch den Boden und Gegenstände, die das Signal

stören könnten -> erhöht die Performance erheblich

- erhöht erheblich die Reichweite des Signals -> Line of sight Übertragung mit ca. 10% abfall

FST

In which waveband does ground-wave propagation occur?

- Ground-wave propagation: LF/MF 30 kHz – 3 MHz

- Sky-wave propagation: HF 3 – 30 MHz

- Line-of-sight propagation: VHF/SHF 30 MHz – 3 GHz

FST

Why does sky-wave propagation depend on the solar activity?

- weiträumige Ausbreitung von Radiowellen im Hochfrequenzbereich durch die Reflektion

an der Ionosphäre

- Die Sonnenaktivität beeinflusst die Beschaffenheit (Ionisierung) der Ionosphäre, welche

wiederum die Reflektion der Wellen beeinflusst

- Magnetische Stürme können die Ausbreitung stark stören

- -> Führen zu double path reception, fading oder over range reception

- MUF -> max usable frequency -> darüber keine Reflexion mehr

- LUF -> lowest usable frequency -> Darunter zu stark gedämpft

- OWF -> optimum working frequency -> 0.9* MUF


FST

What are the advantages of frequency coupling?

effiziente Auslastung der Sektoren -> Personal reduzieren oder Überlastung vermeiden

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