FCCライセンス 6月 3 2024 SUBELEMENT T8A SUBELEMENT T8A T8AT8A – 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 1 / 11 T8A11What is the approximate bandwidth required to transmit a CW signal? A. 2.4 kHz B. 150 Hz C. 1000 Hz D. 15 kHz 2 / 11 T8A10What is the approximate bandwidth of AM fast-scan TV transmissions? A. More than 10 MHz B. About 6 MHz C. About 3 MHz D. About 1 MHz 3 / 11 T8A09What is the approximate bandwidth of a VHF repeater FM voice signal? A. Less than 500 Hz B. About 150 kHz C. Between 10 and 15 kHz D. Between 50 and 125 kHz 4 / 11 T8A08What is the approximate bandwidth of a typical single sideband (SSB) voice signal? A. 1 kHz B. 3 kHz C. 6 kHz D. 15 kHz 5 / 11 T8A07What is a characteristic of single sideband (SSB) compared to FM? A. SSB signals are easier to tune in correctly B. SSB signals are less susceptible to interference C. SSB signals have narrower bandwidth D. All these choices are correct 6 / 11 T8A06Which sideband is normally used for 10 meter HF, VHF, and UHF single-sideband communications? A. Upper sideband B. Lower sideband C. Suppressed sideband D. Inverted sideband 7 / 11 T8A05Which of the following types of signal has the narrowest bandwidth? A. FM voice B. SSB voice C. CW D. Slow-scan TV 8 / 11 T8A04Which type of modulation is commonly used for VHF and UHF voice repeaters? A. AM B. SSB C. PSK D. FM or PM 9 / 11 T8A03Which type of voice mode is often used for long-distance (weak signal) contacts on the VHF and UHF bands? A. FM B. DRM C. SSB D. PM 10 / 11 T8A02What type of modulation is commonly used for VHF packet radio transmissions? A. FM or PM B. SSB C. AM D. PSK 11 / 11 T8A01Which of the following is a form of amplitude modulation? A. Spread spectrum B. Packet radio C. Single sideband D. Phase shift keying (PSK) Your score isThe average score is 45% 0% Restart quiz Ed 0 コメント
