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ZLJ30
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ZLJ30
Subelement ZLJ
Digital Systems
Section ZLJ30
Digital Systems
ZLJ3001
In the block diagram shown, the block designated "modem" is a
Correct Answer
A.
modulator/demodulator
B.
modulation emphasis unit
C.
Morse demodulator
D.
MOSFET de-emphasis unit
ZLJ3001
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ZLJ3002
In the block diagram shown, the "modem"
A.
monitors the demodulated signals
B.
de-emphasises the modulated data
Correct Answer
C.
translates
digital
signals to and from
audio
signals
D.
determines the modulation protocol
ZLJ3002
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ZLJ3003
The following can be adapted for use as a modem
A.
an electronic keyer
B.
a spare transceiver
C.
a spare receiver
Correct Answer
D.
a
computer
sound
-
card
ZLJ3003
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ZLJ3004
The following are three digital communication modes
A.
DSBSC, PACTOR, NBFM
B.
AGC, FSK, Clover
C.
PSK31, AFC, PSSN
Correct Answer
D.
AMTOR
, PACTOR, PSK31
ZLJ3004
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ZLJ3005
In digital communications, FSK stands for
A.
phase selection keying
B.
final section keying
Correct Answer
C.
frequency
shift
keying
D.
final signal keying
ZLJ3005
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ZLJ3006
In digital communications, BPSK stands for
Correct Answer
A.
binary
phase
shift keying
B.
baseband polarity shift keying
C.
band pass selective keying
D.
burst pulse signal keying
ZLJ3006
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ZLJ3007
When your HF digital transmission is received with errors due to multi-path conditions, you should
A.
increase transmitter power
Correct Answer
B.
reduce
transmitted
baud
rate
C.
reduce transmitter power
D.
change frequency slightly
ZLJ3007
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ZLJ3008
The letters BBS stand for
A.
binary baud system
Correct Answer
B.
bulletin
board
system
C.
basic binary selector
D.
broadcast band stopper
ZLJ3008
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ZLJ3009
APRS is an adaptation of packet radio. APRS stands for
Correct Answer
A.
Automatic Packet Reporting System
B.
Amateur Position Reporting System
C.
Automatic Packet Relay System
D.
Amateur Position Relay System
ZLJ3009
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ZLJ3010
The following communication mode is generally used for connecting to a VHF packet radio bulletin board
A.
SSB
B.
AM
Correct Answer
C.
FM
D.
DSB
ZLJ3010
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