Modulation modes; bandwidth of various signals
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T8A-2010: Modulation modes; bandwidth of various signals

T8A01: Which of the following is a form of amplitude modulation?

Single sideband

Spread-spectrum

Packet radio

Phase shift keying



T8A02: What type of modulation is most commonly used for VHF packet radio transmissions?

FM

SSB

AM

Spread Spectrum



T8A03: Which type of voice modulation is most often used for long-distance or weak signal contacts on the VHF and UHF bands?

SSB

FM

AM

PM



T8A04: Which type of modulation is most commonly used for VHF and UHF voice repeaters?

FM

AM

SSB

PSK



T8A05: Which of the following types of emission has the narrowest bandwidth?

CW

FM voice

SSB voice

Slow-scan TV



T8A06: Which sideband is normally used for 10 meter HF, VHF and UHF single-sideband communications?

Upper sideband

Lower sideband

Suppressed sideband

Inverted sideband



T8A07: What is the primary advantage of single sideband over FM for voice transmissions?

SSB signals have narrower bandwidth

SSB signals are easier to tune

SSB signals are less susceptible to interference

All of these choices are correct



T8A08: What is the approximate bandwidth of a single sideband voice signal?

3 kHz

1 kHz

6 kHz

15 kHz



T8A09: What is the approximate bandwidth of a VHF repeater FM phone signal?

Between 5 and 15 kHz

Less than 500 Hz

About 150 kHz

Between 50 and 125 kHz



T8A10: What is the typical bandwidth of analog fast-scan TV transmissions on the 70 cm band?

About 6 MHz

More than 10 MHz

About 3 MHz

About 1 MHz



T8A11: What is the approximate maximum bandwidth required to transmit a CW signal?

150 Hz

2.4 kHz

1000 Hz

15 kHz





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