FCC Technician Class Exam Study Guide - 2014-2018/Subelement T8 Group D

Non-voice communications: image signals; digital modes; CW; packet; PSK31; APRS; error detection and correction; NTSC

Question 1

 * Which of the following is an example of a digital communications method?
 * A. Packet
 * B. PSK31
 * C. MFSK
 * D. All of these choices are correct

The correct answer is D.

Question 2

 * What does the term "APRS" mean?
 * A. Automatic Packet Reporting System
 * B. Associated Public Radio Station
 * C. Auto Planning Radio Set-up
 * D. Advanced Polar Radio System

The correct answer is A.

Question 3

 * Which of the following devices provides data to the transmitter when sending automatic position reports from a mobile amateur radio station?
 * A. The vehicle speedometer
 * B. A WWV receiver
 * C. A connection to a broadcast FM sub-carrier receiver
 * D. A Global Positioning System receiver

The correct answer is D.

Question 4

 * What type of transmission is indicated by the term NTSC?
 * A. A Normal Transmission mode in Static Circuit
 * B. A special mode for earth satellite uplink
 * C. An analog fast scan color TV signal
 * D. A frame compression scheme for TV signals

The correct answer is C.

Question 5

 * Which of the following is an application of APRS (Automatic Packet Reporting System)?
 * A. Providing real time tactical digital communications in conjunction with a map showing the locations of stations
 * B. Showing automatically the number of packets transmitted via PACTOR during a specific time interval
 * C. Providing voice over Internet connection between repeaters
 * D. Providing information on the number of stations signed into a repeater

The correct answer is A.

Question 6

 * What does the abbreviation PSK mean?
 * A. Pulse Shift Keying
 * B. Phase Shift Keying
 * C. Packet Short Keying
 * D. Phased Slide Keying

The correct answer is B.

Question 7

 * What is PSK31?
 * A. A high-rate data transmission mode
 * B. A method of reducing noise interference to FM signals
 * C. A method of compressing digital television signals
 * D. A low-rate data transmission mode

The correct answer is D.

Question 8

 * Which of the following may be included in packet transmissions?
 * A. A check sum which permits error detection
 * B. A header which contains the call sign of the station to which the information is being sent
 * C. Automatic repeat request in case of error
 * D. All of these choices are correct

The correct answer is D.

Question 9

 * What code is used when sending CW in the amateur bands?
 * A. Baudot
 * B. Hamming
 * C. International Morse
 * D. Gray

The correct answer is C.

Question 10

 * Which of the following can be used to transmit CW in the amateur bands?
 * A. Straight Key
 * B. Electronic Keyer
 * C. Computer Keyboard
 * D. All of these choices are correct

The correct answer is D.

Question 11

 * What is an ARQ transmission system?
 * A. A special transmission format limited to video signals
 * B. A system used to encrypt command signals to an amateur radio satellite
 * C. A digital scheme whereby the receiving station detects errors and sends a request to the sending station to retransmit the information
 * D. A method of compressing the data in a message so more information can be sent in a shorter time

The correct answer is C.