Station Assembly, Practice and Safety
digital mode fundamentals (RTTY, ASCII, AMTOR, packet)
What does "connected" mean in a packet-radio link?
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A telephone link is working between two stations
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A message has reached an amateur station for local delivery
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A transmitting and receiving station are using a digipeater, so no other contacts can take place until they are finished
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Correct AnswerA transmitting station is sending data to only one receiving station; it replies that the data is being received correctly
Tags: none
What does "monitoring" mean on a packet-radio frequency?
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A member of the Amateur Auxiliary is copying all messages
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Correct AnswerA receiving station is displaying messages that may not be sent to it, and is not replying to any message
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A receiving station is displaying all messages sent to it, and replying that the messages are being received correctly
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Industry Canada is monitoring all messages
Tags: none
What is a digipeater?
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A repeater built using only digital electronics parts
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A repeater that changes audio signals to digital data
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Correct AnswerA packet-radio station that retransmits only data that is marked to be retransmitted
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A packet-radio station that retransmits any data that it receives
Tags: none
What does "network" mean in packet radio?
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Correct AnswerA way of connecting packet-radio stations so data can be sent over long distances
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A way of connecting terminal-node controllers by telephone so data can be sent over long distances
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The connections on terminal-node controllers
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The programming in a terminal-node controller that rejects other callers if a station is already connected
Tags: none
In packet-radio operation, what equipment connects to a terminal-node controller?
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A transceiver and a modem
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A DTMF keypad, a monitor and a transceiver
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A DTMF microphone, a monitor and a transceiver
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Correct AnswerA transceiver and a terminal or computer system
Tags: none
How would you modulate a 2 meter FM transceiver to produce packet-radio emissions?
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Correct AnswerConnect a terminal-node controller to the transceiver's microphone input
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Connect a terminal-node controller to interrupt the transceiver's carrier wave
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Connect a keyboard to the transceiver's microphone input
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Connect a DTMF key pad to the transceiver's microphone input
Tags: none
When selecting a RTTY transmitting frequency, what minimum frequency separation from a contact in progress should you allow (center to center) to minimize interference?
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Approximately 6 kHz
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Approximately 3 kHz
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Correct Answer250 to 500 Hz
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60 Hz
Tags: none
Digital transmissions use signals called _______ to transmit the states 1 and 0.
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packet and AMTOR
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baudot and ASCII
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Correct Answermark and space
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dot and dash
Tags: none
Which of the following terms does not apply to packet?
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ASCII
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Correct AnswerBaudot
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Terminal-Node Controller (TNC)
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AX.25
Tags: none
When using AMTOR transmissions, there are two modes that may be utilized. Mode A uses Automatic Repeat Request (ARQ) protocol and is normally used:
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at all times. Mode B is for test purposes only
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only when communications have been completed
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Correct Answerfor communications after contact has been established
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when making a general call
Tags: none
What is the most common data rate used for VHF packet communications?
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300 baud
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9600 baud
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2400 baud
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Correct Answer1200 baud
Tags: none
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