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