T6A: Modulation modes, descriptions and bandwidth (AM, FM, SSB)
T6A01:
What are phone transmissions?
Voice transmissions by radio
The use of telephones to set up an amateur radio contact
A phone patch between amateur radio and the telephone system
Placing the telephone handset near a radio transceiver's microphone and speaker to relay a telephone call
T6A02:
Which of the following is a form of amplitude modulation?
Single sideband
Frequency modulation
Phase modulation
Phase shift keying
T6A03:
What name is given to an amateur radio station that is used to connect other amateur stations to the Internet?
A gateway
A repeater
A digipeater
A beacon station
T6A04:
Which type of voice modulation is most often used for long distance and weak signal contacts on the VHF and UHF bands?
SSB
FM
AM
PM
T6A05:
Which type of modulation is most commonly used for VHF and UHF voice repeaters?
FM
AM
SSB
PSK
T6A06:
Which emission type has the narrowest bandwidth?
CW
FM voice
SSB voice
Slow-scan TV
T6A07:
Which sideband is normally used for VHF and UHF SSB communications?
Upper sideband
Lower sideband
Suppressed sideband
Inverted sideband
T6A08:
What is the primary advantage of single sideband over FM for voice transmissions?
SSB signals use much less bandwidth than FM signals
SSB signals are easier to tune in than FM signals
SSB signals are less likely to be bothered by noise interference than FM signals.
SSB signals have no advantages at all in comparison to other modes.
T6A09:
What is the approximate bandwidth of a single-sideband voice signal?
Between 2 and 3 kHz
1 kHz
2 kHz
Between 3 and 6 kHz
T6A10:
What is the approximate bandwidth of a frequency-modulated voice signal?
Between 5 and 15 kHz
Less than 500 Hz
About 150 kHz
More than 30 kHz
T6A11:
What is the normal bandwidth required for a conventional fast-scan TV transmission using combined video and audio on the 70-centimeter band?
About 6 MHz
More than 10 MHz
About 3 MHz
About 1 MHz
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● = Review
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● = Learned
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● = Incorrect answer
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