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Assignment 12

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 

T3A10 What may occur if data signals propagate over multiple paths?
a.
Transmission rates can be increased by a factor equal to the number of separate paths observed
c.
No significant changes will occur if the signals are transmitting using FM
b.
Transmission rates must be decreased by a factor equal to the number of separate paths observed
d.
Error rates are likely to increase
 

 2. 

T4A06 Which of the following would be connected between a transceiver and computer in a packet radio station?
a.
Transmatch
c.
Terminal node controller
b.
Mixer
d.
Antenna
 

 3. 

T4A07 How is a computer’s sound card used when conducting digital communications using a computer?
a.
The sound card communicates between the computer CPU and the video display
c.
The sound card provides audio to the microphone input and converts received audio to digital form
b.
The sound card records the audio frequency for video display
d.
All of these choices are correct
 

 4. 

T8A10 What is the typical bandwidth of analog fast-scan TV transmissions on the 70 cm band?
a.
More than 10 MHz
c.
About 3 MHz
b.
About 6 MHz
d.
About 1 MHz
 

 5. 

T8C06 How is access to an IRLP node accomplished?
a.
By obtaining a password which is sent via voice to the node
c.
By entering the proper Internet password
b.
By using DTMF signals
d.
By using CTCSS tone codes
 

 6. 

T8C09 How might you obtain a list of active nodes that use VoIP?
a.
From the FCC Rulebook
c.
From a repeater directory
b.
From your local emergency coordinator
d.
From the local repeater frequency coordinator
 

 7. 

T8C10 How do you select a specific IRLP node when using a portable transceiver?
a.
Choose a specific CTCSS tone
c.
Access the repeater autopatch
b.
Choose the correct DSC tone
d.
Use the keypad to transmit the IRLP node ID
 

 8. 

T8C11 What name is given to an amateur radio station that is used to connect other amateur stations to the Internet?
a.
A gateway
c.
A digipeater
b.
A repeater
d.
A beacon
 

 9. 

T8C12 What is meant by Voice Over Internet Protocol (VoIP) as used in amateur radio?
a.
A set of rules specifying how to identify your station when linked over the Internet to another station
c.
A technique for measuring the modulation quality of a transmitter using remote sites monitored via the Internet
b.
A set of guidelines for working DX during contests using Internet access
d.
A method of delivering voice communications over the Internet using digital techniques
 

 10. 

T8C13 What is the Internet Radio Linking Project (IRLP)?
a.
A technique to connect amateur radio systems, such as repeaters, via the Internet using Voice Over Internet Protocol
c.
A system for informing amateurs in real time of the frequency of active DX stations
b.
A system for providing access to websites via amateur radio
d.
A technique for measuring signal strength of an amateur transmitter via the Internet
 

 11. 

T8D01 Which of the following is an example of a digital communications method?
a.
Packet
c.
MFSK
b.
PSK31
d.
All of these choices are correct
 

 12. 

T8D02 What does the term “APRS” mean?
a.
Automatic Packet Reporting System
c.
Auto Planning Radio Set-up
b.
Associated Public Radio Station
d.
Advanced Polar Radio System
 

 13. 

T8D03 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
c.
A connection to a broadcast FM sub-carrier receiver
b.
A WWV receiver
d.
A Global Positioning System receiver
 

 14. 

T8D04 What type of transmission is indicated by the term NTSC?
a.
A Normal Transmission mode in Static Circuit
c.
An analog fast scan color TV signal
b.
A special mode for earth satellite uplink
d.
A frame compression scheme for TV signals
 

 15. 

T8D05 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
c.
Providing voice over Internet connection between repeaters
b.
Showing automatically the number of packets transmitted via PACTOR during a specific time interval
d.
Providing information on the number of stations signed into a repeater
 

 16. 

T8D06 What does the abbreviation PSK mean?
a.
Pulse Shift Keying
c.
Packet Short Keying
b.
Phase Shift Keying
d.
Phased Slide Keying
 

 17. 

T8D07 What is PSK31?
a.
A high-rate data transmission mode
c.
A method of compressing digital television signals
b.
A method of reducing noise interference to FM signals
d.
A low-rate data transmission mode
 

 18. 

T8D08 Which of the following may be included in packet transmissions?
a.
A check sum which permits error detection
c.
Automatic repeat request in case of error
b.
A header which contains the call sign of the station to which the information is being sent
d.
All of these choices are correct
 

 19. 

T8D09 What code is used when sending CW in the amateur bands?
a.
Baudot
c.
International Morse
b.
Hamming
d.
Gray
 

 20. 


T8D10 Which of the following can be used to transmit CW in the amateur bands?
a.
Straight Key
c.
Computer Keyboard
b.
Electronic Keyer
d.
All of these choices are correct
 

 21. 

T8D11 What is an ARQ transmission system?
a.
A special transmission format limited to video signals
c.
A digital scheme whereby the receiving station detects errors and sends a request to the sending station to retransmit the information
b.
A system used to encrypt command signals to an amateur radio satellite
d.
A method of compressing the data in a message so more information can be sent in a shorter time
 



 
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