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--- a/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?
+	- [[A.]] PACTOR
+	- [[B.]] QAM
+	- [[C.]] AX.25
+	- [[D.]] AMTOR
+--
+- [[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
--- a/logseq/bak/pages/E2D/2025-05-01T20_36_51.615Z.Desktop.md
+++ b/logseq/bak/pages/E2D/2025-05-01T20_36_51.615Z.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? #card
+	- [[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? #card
+	- [[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? #card
+	- [[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? #card
+	- [[A.]] FT8
+	- [[B.]] Bandwidth compressed LORAN
+	- [[C.]] APRS
+	- [[D.]]  PACTOR III
+--
+- [[E2D05]] (B)
+What is the characteristic of the JT65 mode? #card
+	- [[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? #card
+	- [[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? #card
+	- [[A.]] PACTOR
+	- [[B.]] QAM
+	- [[C.]] AX.25
+	- [[D.]] AMTOR
+--
+- [[E2D08]] (C)
+What type of packet frame is used to transmit APRS beacon data? #card
+	- [[A.]] Acknowledgement
+	- [[B.]] Burst
+	- [[C.]] Unnumbered Information
+	- [[D.]] Connect
+--
+- [[E2D09]] (A)
+What type of modulation is used by JT65? #card
+	- [[A.]] Multitone AFSK
+	- [[B.]] PSK
+	- [[C.]] RTTY
+	- [[D.]] QAM
+--
+- [[E2D10]] (C)
+What does the packet path WIDE3-1 designate? #card
+	- [[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? #card
+	- [[A.]] By packet ACK/NAK relay
+	- [[B.]] By C4FM repeaters
+	- [[C.]] By DMR repeaters 
+	- [[D.]] By packet digipeaters