Which of the following is a form of amplitude modulation?

1. A Spread spectrum
2. B Packet radio
3. C Single sideband
4. D Phase shift keying (PSK)

What type of modulation is commonly used for VHF packet radio transmissions?

1. A FM or PM
2. B SSB
3. C AM
4. D PSK

Which type of voice mode is often used for long-distance (weak signal) contacts on the VHF and UHF bands?

1. A FM
2. B DRM
3. C SSB
4. D PM

Which type of modulation is commonly used for VHF and UHF voice repeaters?

1. A AM
2. B SSB
3. C PSK
4. D FM or PM

Which of the following signal types has the narrowest bandwidth?

1. A FM voice
2. B SSB voice
3. C CW
4. D Slow-scan TV

Which sideband is normally used for 10-meter HF, VHF, and UHF single-sideband communications?

1. A Upper sideband
2. B Lower sideband
3. C Suppressed sideband
4. D Inverted sideband

What is one characteristic of single sideband (SSB) compared to FM?

1. A SSB signals are easier to tune in correctly
2. B SSB signals are less susceptible to interference
3. C SSB signals have narrower bandwidth
4. D SSB signals are less susceptible to high SWR

What is the approximate bandwidth of a typical single sideband (SSB) voice signal?

1. A 1 kHz
2. B 3 kHz
3. C 6 kHz
4. D 15 kHz

What is the approximate bandwidth of an FM voice signal on VHF repeaters?

1. A Less than 500 Hz
2. B About 150 kHz
3. C Between 10 and 15 kHz
4. D Between 50 and 125 kHz

What is the approximate bandwidth of AM fast-scan TV transmissions?

1. A More than 10 MHz
2. B About 6 MHz
3. C About 3 MHz
4. D About 1 MHz

What is the approximate bandwidth required to transmit a CW signal?

1. A 2.4 kHz
2. B 150 Hz
3. C 1000 Hz
4. D 15 kHz

Which of the following is a disadvantage of FM compared with single sideband?

1. A Voice quality is poorer
2. B Only one signal can be received at a time
3. C FM signals are harder to tune
4. D FM signals are more susceptible to high SWR