B-003-15: Digital mode fundamentals (RTTY, ASCII, AMTOR, packet)
B-003-15-01:
What does "connected" mean in a packet-radio link?
A transmitting station is sending data to only one receiving station; it replies that the data is being received correctly
A telephone link is working between two stations
A message has reached an amateur station for local delivery
A transmitting and receiving station are using a digipeater, so no other contacts can take place until they are finished
B-003-15-02:
What does "monitoring" mean on a packet-radio frequency?
A receiving station is displaying messages that may not be sent to it, and is not replying to any message
A member of the Amateur Auxiliary is copying all messages
A receiving station is displaying all messages sent to it, and replying that the messages are being received correctly
Industry Canada is monitoring all messages
B-003-15-03:
What is a digipeater?
A packet-radio station that retransmits only data that is marked to be retransmitted
A repeater built using only digital electronics parts
A repeater that changes audio signals to digital data
A packet-radio station that retransmits any data that it receives
B-003-15-04:
What does "network" mean in packet radio?
A way of connecting packet-radio stations so data can be sent over long distances
A way of connecting terminal-node controllers by telephone so data can be sent over long distances
The connections on terminal-node controllers
The programming in a terminal-node controller that rejects other callers if a station is already connected
B-003-15-05:
In packet-radio operation, what equipment connects to a terminal-node controller?
A transceiver and a terminal or computer system
A transceiver and a modem
A DTMF keypad, a monitor and a transceiver
A DTMF microphone, a monitor and a transceiver
B-003-15-06:
How would you modulate a 2 meter FM transceiver to produce packet-radio emissions?
Connect a terminal-node controller to the transceiver's microphone input
Connect a terminal-node controller to interrupt the transceiver's carrier wave
Connect a keyboard to the transceiver's microphone input
Connect a DTMF key pad to the transceiver's microphone input
B-003-15-07:
When selecting a RTTY transmitting frequency, what minimum frequency separation from a contact in progress should you allow (center to center) to minimize interference?
250 to 500 Hz
Approximately 6 kHz
Approximately 3 kHz
60 Hz
B-003-15-08:
Digital transmissions use signals called __________ to transmit the states 1 and 0
mark and space
packet and AMTOR
baudot and ASCII
dot and dash
B-003-15-09:
Which of the following terms does not apply to packet?
Baudot
ASCII
Terminal-Node Controller (TNC)
AX.25
B-003-15-10:
When using AMTOR transmissions, there are two modes that may be utilized. Mode A uses Automatic Repeat Request (ARQ) protocol and is normally used:
for communications after contact has been established
at all times. Mode B is for test purposes only
only when communications have been completed
when making a general call
B-003-15-11:
What is the most common data rate used for VHF packet communications?
1200 baud
300 baud
9600 baud
2400 baud
|
Color key:
|
|
● = Unseen
|
|
● = Weak
|
|
● = Review
|
|
● = Learned
|
|
● = Incorrect answer
|
