86 lines
2.4 KiB
Markdown
86 lines
2.4 KiB
Markdown
T8A – Basic characteristics of FM and SSB; Bandwidth of various modulation modes: CW, SSB, FM, fast-scan TV; Choice of emission type: selection of USB vs LSB, use of SSB for weak signal work, use of FM for VHF packet and repeaters
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- [[T8A01]] (C)
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Which of the following is a form of amplitude modulation? #card
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- A. Spread spectrum
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- B. Packet radio
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- C. Single sideband
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- D. Phase shift keying (PSK)
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--
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- [[T8A02]] (A)
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What type of modulation is commonly used for VHF packet radio transmissions? #card
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- A. FM or PM
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- B. SSB
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- C. AM
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- D. PSK
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--
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- [[T8A03]] (C)
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Which type of voice mode is often used for long-distance (weak signal) contacts on the VHF and UHF bands? #card
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- A. FM
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- B. DRM
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- C. SSB
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- D. PM
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- [[T8A04]] (D)
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Which type of modulation is commonly used for VHF and UHF voice repeaters? #card
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- A. AM
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- B. SSB
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- C. PSK
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- D. FM or PM
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--
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- [[T8A05]] (C)
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Which of the following types of signal has the narrowest bandwidth? #card
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- A. FM voice
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- B. SSB voice
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- C. CW
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- D. Slow-scan TV
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--
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- [[T8A06]] (A)
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Which sideband is normally used for 10 meter HF, VHF, and UHF single-sideband communications? #card
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- A. Upper sideband
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- B. Lower sideband
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- C. Suppressed sideband
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- D. Inverted sideband
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--
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- [[T8A07]] (C)
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What is a characteristic of single sideband (SSB) compared to FM? #card
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- A. SSB signals are easier to tune in correctly
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- B. SSB signals are less susceptible to interference
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- C. SSB signals have narrower bandwidth
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- D. All these choices are correct
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- [[T8A08]] (B)
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What is the approximate bandwidth of a typical single sideband (SSB) voice signal? #card
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- A. 1 kHz
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- B. 3 kHz
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- C. 6 kHz
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- D. 15 kHz
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- [[T8A09]] (C)
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What is the approximate bandwidth of a VHF repeater FM voice signal? #card
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- A. Less than 500 Hz
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- B. About 150 kHz
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- C. Between 10 and 15 kHz
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- D. Between 50 and 125 kHz
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- [[T8A10]] (B)
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What is the approximate bandwidth of AM fast-scan TV transmissions? #card
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- A. More than 10 MHz
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- B. About 6 MHz
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- C. About 3 MHz
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- D. About 1 MHz
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- [[T8A11]] (B)
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What is the approximate bandwidth required to transmit a CW signal? #card
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- A. 2.4 kHz
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- B. 150 Hz
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- C. 1000 Hz
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- D. 15 kHz
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--
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- [[T8A12]] (B)
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Which of the following is a disadvantage of FM compared with single sideband? #card
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- A. Voice quality is poorer
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- B. Only one signal can be received at a time
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- C. FM signals are harder to tune
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- D. All these choices are correct
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