E2D Digital Operating: HF digital
communications (ie, PacTOR, CLOVER,
AMTOR, PSK31, HF packet); packet clusters; HF digital bulletin boards
E2D01
(B)
What is
the most common method of transmitting data emissions below 30 MHz?
A. DTMF tones modulating an FM signal
B. FSK (frequency-shift
keying) of an RF carrier
C. AFSK (audio frequency-shift keying) of an FM
signal
D. Key-operated on/off switching of an RF
carrier
E2D02
(A)
What do
the letters "FEC" mean as they relate to AMTOR operation?
A. Forward Error Correction
B. First Error Correction
C. Fatal Error Correction
D. Final Error Correction
E2D03
(C)
How is
Forward Error Correction implemented?
A. By transmitting blocks of 3 data characters
from the sending station to the receiving station which the receiving station
acknowledges
B. By transmitting a special FEC algorithm
which the receiving station uses for data validation
C. By transmitting each data
character twice, since there is no specific acknowledgment of reception
D. By varying the frequency shift of the
transmitted signal according to a predefined algorithm
E2D04
(B)
What
does "CMD:" mean when it is displayed on the video monitor of a
packet station?
A. The TNC is ready to exit the packet terminal
program
B. The TNC is in command
mode, ready to receive instructions from the keyboard
C. The TNC will exit to the command mode on the
next keystroke
D. The TNC is in KISS mode running TCP/IP,
ready for the next command
E2D05
(D)
What is
the Baudot code?
A. A code used to transmit data only in modern
computer-based data systems using seven data bits
B. A binary code consisting of eight data bits
C. An alternate name for Morse code
D. The "International
Telegraph Alphabet Number 2" (ITA2) which uses five data bits
E2D06 (A)
If an
oscilloscope is connected to a TNC or terminal unit and is displaying two
crossed ellipses, one of which suddenly disappears, what would this indicate
about the observed signal?
A. The phenomenon known as
"selective fading" has occurred
B. One of the signal filters has saturated
C. The receiver should be retuned, as it has
probably moved at least 5 kHz from the desired receive frequency
D. The mark and space signal have been inverted
and the receiving equipment has not yet responded to the change
E2D07
(D)
Which
of the following systems is used to transmit high-quality still images by
radio?
A. AMTOR
B. Baudot RTTY
C. AMTEX
D. Facsimile
E2D08
(C)
What
special restrictions are imposed on facsimile (fax) transmissions?
A. None; they are allowed on all amateur
frequencies
B. They are restricted to 7.245 MHz, 14.245
MHz, 21.345, MHz, and 28.945 MHz
C. They are allowed in phone
band segments if their bandwidth is no greater than that of a voice signal of
the same modulation type
D. They are not permitted above 54 MHz
E2D09
(D)
What is
the name for a bulletin transmission system that includes a special header to
allow receiving stations to determine if the bulletin has been previously
received?
A. ARQ mode A
B. FEC mode B
C. AMTOR
D. AMTEX
E2D10
(A)
What is
a Packet Cluster Bulletin Board?
A. A packet bulletin board
devoted primarily to serving a special interest group
B. A group of general-purpose packet bulletin
boards linked together in a "cluster"
C. A special interest cluster of packet
bulletin boards devoted entirely to packet radio computer communications
D. A special interest telephone/modem bulletin
board devoted to amateur DX operations
E2D11
(C)
Which
of the following statements comparing HF and 2-meter packet operations is NOT
true?
A. HF packet typically uses an FSK signal with
a data rate of 300 bauds; 2-meter packet uses an AFSK signal with a data rate
of 1200 bauds
B. HF packet and 2-meter packet operations use
the same code for information exchange
C. HF packet is limited to
Extra class amateur licensees; 2 meter packet is open to all but Novice class
amateur licensees
D. HF packet operations are limited to
"CW/Data"-only band segments; 2-meter packet is allowed wherever FM
operations are allowed