Technician Practice Test T8 – Modulation, Digital Modes and Satellites
FM, SSB and CW, signal bandwidth, amateur satellites and digital modes. Tap an answer to check it.
Score: 0 / 0 (15)
Question 1
Which of the following is a form of amplitude modulation?
Single sideband is a form of amplitude modulation with the carrier and one sideband removed.
Question 2
What type of modulation is commonly used for VHF packet radio transmissions?
VHF packet radio commonly uses FM or PM.
Question 3
Which type of voice mode is often used for long-distance (weak signal) contacts on the VHF and UHF bands?
SSB is used for weak-signal, long-distance voice contacts on VHF and UHF.
Question 4
Which type of modulation is commonly used for VHF and UHF voice repeaters?
VHF and UHF voice repeaters use FM (or PM).
Question 5
Which of the following signal types has the narrowest bandwidth?
CW (Morse code) has the narrowest bandwidth of these signal types.
Question 6
Which sideband is normally used for 10-meter HF, VHF, and UHF single-sideband communications?
Upper sideband is the convention on 10 meters and on VHF and UHF.
Question 7
What is one characteristic of single sideband (SSB) compared to FM?
SSB takes much less bandwidth than FM.
Question 8
What is the approximate bandwidth of a typical single sideband (SSB) voice signal?
An SSB voice signal is about 3 kHz wide.
Question 9
What is the approximate bandwidth of an FM voice signal on VHF repeaters?
An FM voice signal on VHF repeaters is about 10 to 15 kHz wide.
Question 10
What is the approximate bandwidth of AM fast-scan TV transmissions?
Analog fast-scan TV takes about 6 MHz of bandwidth.
Question 11
What is the approximate bandwidth required to transmit a CW signal?
A CW signal needs only about 150 Hz.
Question 12
Which of the following is a disadvantage of FM compared with single sideband?
FM receivers lock onto the strongest signal (capture effect), so only one signal can be heard at a time.
Question 13
What telemetry information is typically transmitted by satellite beacons?
Satellite beacons send telemetry about the health and status of the satellite.
Question 14
What is the impact of using excessive effective radiated power on a satellite uplink?
Too much uplink power can take over the transponder and block other users.
Question 15
Which of the following are provided by satellite tracking programs?
Tracking programs show the satellite's track on a map, the time, azimuth and elevation of each pass, and the Doppler-shifted frequency.
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The questions are the official public Technician pool. The rules come from FCC Part 97. Always check these sources for the current rules.