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Extra-Study/logseq/bak/pages/E2D/2025-05-01T20_36_29.888Z.Desktop.md
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E2D Operating methods: digital modes and procedures for VHF and UHF; APRS; EME procedures; meteor scatter procedures

  • E2D01 (B) Which of the following digital modes is designed for meteor scatter communications?
    • A. WSPR
    • B. MSK144
    • C. Hellschreiber
    • D. APRS
  • E2D02 (D) What information replaces signal-to-noise ratio when using the FT8 or FT4 modes in a VHF contest?
    • A. RST report
    • B. State abbreviation
    • C. Serial number
    • D. Grid square
  • E2D03 (D) Which of the following digital modes is designed for EME communications?
    • A. MSK144
    • B. PACTOR III
    • C. WSPR
    • D. Q65
  • E2D04 (C) What technology is used for real-time tracking of balloons carrying amateur radio transmitters?
    • A. FT8
    • B. Bandwidth compressed LORAN
    • C. APRS
    • D. PACTOR III
  • E2D05 (B) What is the characteristic of the JT65 mode?
    • A. Uses only a 65 Hz bandwidth
    • B. Decodes signals with a very low signal-to-noise ratio
    • C. Symbol rate is 65 baud
    • D. Permits fast-scan TV transmissions over narrow bandwidth
  • E2D06 (A) Which of the following is a method for establishing EME contacts?
    • A. Time-synchronous transmissions alternating between stations
    • B. Storing and forwarding digital messages
    • C. Judging optimum transmission times by monitoring beacons reflected from the moon
    • D. High-speed CW identification to avoid fading
  • E2D07 (C) What digital protocol is used by APRS?
  • E2D08 (C) What type of packet frame is used to transmit APRS beacon data?
    • A. Acknowledgement
    • B. Burst
    • C. Unnumbered Information
    • D. Connect
  • E2D09 (A) What type of modulation is used by JT65?
    • A. Multitone AFSK
    • B. PSK
    • C. RTTY
    • D. QAM
  • E2D10 (C) What does the packet path WIDE3-1 designate?
    • A. Three stations are allowed on frequency, one transmitting at a time
    • B. Three subcarriers are permitted, subcarrier one is being used
    • C. Three digipeater hops are requested with one remaining
    • D. Three internet gateway stations may receive one transmission
  • E2D11 (D) How do APRS stations relay data?
    • A. By packet ACK/NAK relay
    • B. By C4FM repeaters
    • C. By DMR repeaters
    • D. By packet digipeaters